103642636 Konica Minolta BizHub Pro 1050 1050P Theory of Operation

SERVICE MANUAL

2005.03

Ver. 2.0

Theory of Operation

1050ma.book Page 1 Tuesday, March 1, 2005 9:50 PM

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CONTENTS

SAFETY AND IMPORTANT WARNING ITEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-1

IMPORTANT NOTICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-1

DESCRIPTION ITEMS FOR DANGER, WARNING AND CAUTION . . . . . . . . . . . . . . . S-1

SAFETY WARNINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-2

SAFETY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-11

IMPORTANT NOTICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-11

INDICATION OF WARNING ON THE MACHINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-12

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vRevision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vComposition of the service manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viNotation of the service manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii

Measures to take in case of an accident . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x

I OUTLINE1. SYSTEM CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12. PRODUCT SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2.1 Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32.2 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32.3 Type of paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42.4 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42.5 Machine data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-52.6 Operating environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

3. UNIT CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-64. PAPER PATH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

II COMPOSITION/OPERATION1. OVERALL COMPOSITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

1.1 Timing chart when the power is on. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11.2 Control block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

2. SCANNER SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

2.3.1 Scanner/exposure lamp control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-52.3.2 Original size detection control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-102.3.3 AE/AES control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-112.3.4 Image processing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

3. WRITE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-133.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-133.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

3.2.1 Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-143.2.2 Laser beam path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-153.2.3 Write control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

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3.2.4 Image stabilization control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-164. PHOTO CONDUCTOR SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

4.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-174.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-184.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

4.3.1 Drum claw drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-194.3.2 Cooling around the drum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-194.3.3 Image stabilization control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20

5. CHARGING SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-215.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-215.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-215.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22

5.3.1 Charging control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-225.3.2 Wire cleaning control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-225.3.3 Erase lamp control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23

6. TRANSFER/SEPARATION SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-246.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-246.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-256.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26

6.3.1 Transfer guide control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-266.3.2 Transfer/separation control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-266.3.3 Transfer exposure lamp control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-266.3.4 Transfer assist control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-276.3.5 Wire cleaning control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28

6.4 PCS correspondence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-296.4.1 Transfer assist sheet by paper sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29

7. DEVELOPING UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-307.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-307.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-317.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32

7.3.1 Flow of developer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-327.3.2 Developing bias . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-337.3.3 Developing suction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-347.3.4 Image stabilization control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35

8. TONER SUPPLY SECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-368.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-368.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-378.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39

8.3.1 Toner conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-398.3.2 Toner supply control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-418.3.3 Toner remaining detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41

9. CLEANING/RECYCLE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-439.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-439.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-449.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-45

9.3.1 Cleaning operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-459.3.2 Toner collection mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-479.3.3 Toner conveyance operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-479.3.4 Image stabilization control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-47

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10.PAPER FEED SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4810.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4810.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-49

10.2.1 Tray lift drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4910.2.2 Paper feed drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5010.2.3 Pick-up drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-51

10.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5210.3.1 Up/down control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5210.3.2 Size detection control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5310.3.3 Pick-up mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5510.3.4 Separation mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5610.3.5 Air assist mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5710.3.6 Paper empty detection control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5810.3.7 Remaining paper detection control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5810.3.8 Tray lock control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5910.3.9 Dehumidification heater control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-59

10.4 PCS corresponding parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6010.4.1 Corresponding to additional prints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-60

11.VERTICAL CONVEYANCE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6211.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6211.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6311.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-64

11.3.1 Pre-registration control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6411.3.2 Conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6411.3.3 Exit conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6411.3.4 Paper dust removing mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-64

12.REGISTRATION SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6512.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6512.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6612.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-67

12.3.1 Multi feed detection control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6712.3.2 Loop control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6712.3.3 Paper mis-centering adjustment control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6812.3.4 Paper leading edge timing adjustment control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-68

13.HORIZONTAL CONVEYANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6913.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6913.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6913.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-70

13.3.1 Conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7014.ADU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-72

14.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7214.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7214.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-73

14.3.1 Conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7315.FUSING SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-74

15.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7415.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-75

15.2.1 Web drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7515.2.2 Fusing drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-75

15.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-76

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CONTENTS bizhub PRO 1050/1050P Theory of Operation Ver.2.0

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15.3.1 Fusing roller drive control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7615.3.2 Web drive control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7615.3.3 Fusing temperature control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7715.3.4 Thick paper conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7815.3.5 Protection against an error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-78

16.REVERSE/EXIT SECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7916.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7916.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7916.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-80

16.3.1 Conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8017. INTERFACE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-82

17.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8218. IMAGE STABILIZATION CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-83

18.1 Outline. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8318.2 Operation flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-83

18.2.1 Image stabilization control flow when the power switch (SW2) is ON . . . . . . . . . . . . . . . . . . 2-8318.2.2 Image stabilization control flow while in the print and during idling . . . . . . . . . . . . . . . . . . . . 2-86

19. IMAGE PROCESSING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8819.1 Image processing in the scanner section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-88

19.1.1 Shading correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8919.1.2 AE control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9019.1.3 Area discrimination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9119.1.4 Brightness/density conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9119.1.5 Filter/magnification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9219.1.6 Scanner gamma correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9419.1.7 Halftone processing (error diffusion) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9419.1.8 Tilt adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9419.1.9 Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9419.1.10 Storage of image data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-94

19.2 Image processing in the write section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9520.OTHERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-96

20.1 Other fan controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9620.1.1 Composition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9620.1.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-97

20.2 HDD control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10220.2.1 Composition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10220.2.2 Backup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-102

20.3 Counter control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10320.3.1 Composition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10320.3.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-103

20.4 Parts that operate when the power switch is turned ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10520.4.1 Parts that operate when the main power switch is turned ON. . . . . . . . . . . . . . . . . . . . . . . 2-105

1050matce.fm Page iv Wednesday, March 2, 2005 11:10 PM

bizhub PRO 1050/1050P Theory of Operation Ver.2.0 Introduction

v

Introduction

Revision history

After publication of this service manual, the parts and mechanism may be subject to change for improvement oftheir performance. Therefore, the descriptions given in this service manual may not coincide with the actual machine.

When any change has been made to the descriptions in the service manual, a revised version will be issued witha revision mark added as required.

Revision mark: To indicate clearly a section revised, show to the left of the revised section.

A number within represents the number of times the revision has been made.

To indicate clearly a section revised, show in the lower outside section of the corresponding page. A number within represents the number of times the revision has been made.

Note:Revision marks shown in a page are restricted only to the latest ones with the old ones deleted. When a page revised in Ver. 2.0 has been changed in Ver. 3.0:

The revision marks for Ver. 3.0 only are shown with those for Ver. 2.0 deleted. When a page revised in Ver. 2.0 has not been changed in Ver. 3.0:

The revision marks for Ver. 2.0 are left as they are.

1

1

2005/03 2.0 Revision due to the addition of a new option (SD, RC)

2004/10 1.0 Issue of the first edition

DateService manual

Ver.Revision mark Descriptions of revision

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Introduction bizhub PRO 1050/1050P Theory of Operation Ver.2.0

vi

Composition of the service manual

This service manual consists of the following sections and chapters:

I. OUTLINE: System configuration, product specifications, unit configuration, and paper

path

II. COMPOSITION/OPERATION: Configuration of each unit, explanation of the operating system,

and explanation of the control system

This section gives, as information for the CE to get a full understanding of the product, a rough outline of the

object and role of each function, the relationship between the electrical system and the mechanical system, and

the timing of operation of each part.

I. OUTLINE: System configuration, and product specifications

II. MAINTENANCE: Service schedule *, maintenance steps,

list of service tools and directions for use *,

firmware version up method *,

and removal/reinstallation methods of major parts

III. ADJUSTMENT/SETTING: Utility mode *, service mode *, security *, mechanical adjustment and POD

corresponding adjustment

IV. TROUBLESHOOTING *: List of jam codes, their causes, operation when a jam occurs and its release

method, and list of error codes, their causes, operation when a warning is

issued and estimated abnormal parts.

V. APPENDIX *: Parts layout drawings, connector layout drawings, timing chart, overall layout

drawing

This section gives, as information required by the CE at the site (or at the customer's premise), a rough outline of

the service schedule and its details, maintenance steps, the object and role of each adjustment, error codes and

supplementary information.

The details of items with an asterisk "*" are described only in the service manual of the main body.

1050ma.book Page vi Tuesday, March 1, 2005 9:50 PM


vii

Notation of the service manual

1. Product name

In this manual, each of the products is described as follows:

(1) IC board: Standard printer

(2) KonicaMinolta bizhub PRO 1050: Main body

(3) PS-502 PostScript3 Option: PS3 Option

(4) Microsoft Windows 95: Windows 95

Microsoft Windows 98: Windows 98

Microsoft Windows Me: Windows Me

Microsoft Windows NT 4.0: Windows NT 4.0 or Windows NT

Microsoft Windows 2000: Windows 2000

Microsoft Windows XP: Windows XP

When the description is made in combination of the OS's mentioned above:

Windows 95/98/Me

Windows NT 4.0/2000

Windows NT/2000/XP

Windows 95/98/Me/ NT/2000/XP

2. Brand name

The company names and product names mentioned in this manual are the brand name or the registered trade-

mark of each company.

3. Electrical parts and signals

Those listed by way of example below are not exhaustive, but only some instances among many.

Classification Load symbol Ex. of signal name Description

Sensor PS

IN

Sensor detection signal

PS

Door PS1

SIG

102 PS

Solenoid SD

24V Power to drive the solenoid

DRVDrive signal

SOL

Clutch CL

24V Power to drive the clutch

DRVDrive signal

SOL

Motor M

24V Power to drive the motor

CONT Drive signal

DRV1

Drive signals of two kindsDRV2

D1

D2

1050ma.book Page vii Tuesday, March 1, 2005 9:50 PM

Introduction bizhub PRO 1050/1050P Theory of Operation Ver.2.0

viii

Motor M

_U

Drive signals (control signals) of three kinds

_V

_W

DRV1

DRV2

DRV3

D1

Drive signals (control signals) of four kindsMotor, phases A and B control signals

D2

D3

D4

DRV A

DRV A

DRV B

DRV B

A

/A

B

/B

AB

BB

CLK, PLL PLL control signal

LCK, Lock, LD PLL lock signal

FR Forward/reverse rotation signal

EM, Lock, LCK, LD Motor lock abnormality

BLK Drive brake signal

P/S Power/stop

S/SOperating load start/stop signal

SS

CW/CCW, F/R Rotational direction switching signal

ENB Effective signal

TEMP_ER Motor temperature abnormality detection signal

Fan FM

24V Power to drive the fan motor

CONT, DRIVE Drive signal

HL Speed control signal (2 speeds)

EM, Lock, LCK, FEM Detection signal

Others TH1.S, ANG Analog signal

GroundSG, S.GND, S_GND Signal ground

PG, P.GND Power ground


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ix

Serial commu-nication

DCD Data carrier detection

SIN Serial input

SOUT Serial output

DTR Data terminal operation available

GND Signal ground (earth)

DSR, DSET Data set ready

RTS Transmission request signal

CTS Consent transmission signal

RI Ring indicator

TXD Serial transmission data

RXD Serial reception data


1050ma.book Page ix Tuesday, March 1, 2005 9:50 PM

Measures to take in case of an accident bizhub PRO 1050/1050P Theory of Operation Ver.2.0

x

Measures to take in case of an accident

1. If an accident has occurred, the distributor who has been notified first must immediately take emergency

measures to provide relief to affected persons and to prevent further damage.

2. If a report of a serious accident has been received from a customer, an on-site evaluation must be carried

out quickly and KMBT must be notified.

3. To determine the cause of the accident, conditions and materials must be recorded through direct on-site

checks, in accordance with instructions issued by KMBT.

4. For reports and measures concerning serious accidents, follow the regulations given in "Serious Accident

Report/Follow-up Procedures."

1050ma.book Page x Tuesday, March 1, 2005 9:50 PM

bizhub PRO 1050/1050P Theory of Operation Ver.2.0 SYSTEM CONFIGURATION

1 -1

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1

I OUTLINE

1. SYSTEM CONFIGURATION

A. System configuration

1050to1001e

[4]

[11]

[9]

[10]

[3]

[1]

[2]

[8]

[5]

[6]

[7]

[12]


SYSTEM CONFIGURATION bizhub PRO 1050/1050P Theory of Operation Ver.2.0

1 -2

I Out

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1

*1 In the case of the 1050P, no scanner/DF function is provided.*2 Attach the side cover when PF-701 is not connected. The side cover is available as the service parts.

B. Option coupling formation

NOTE The option can be connected. However, be sure to take note of the AC connection mode.

NOTE Any coupling formation other than the above is unavailable. PF-701 can be either connected or disconnected.

[1] Main body [8] Toner recycle cut kit (RC-501)

[2][3]

Large capacity paper feed unit (PF-701)Double sided original auto feeder (DF-603) *1

[9] Expanded memory: 256 MB (EM-701) for the image controller

[4] Flat stapling finisher (FS-503) [10] Side cover *2

[5] Punch and multi folding finisher (FD-501) [11] Saddle stitching trimmer finisher (SD-501)

[6] Large capacity stacker (LS-501) [12] Hand cart (LC-501)

[7] Large capacity stacker (LS-502)

Coupling combination of the main body and the finisher option AC power to be connected to

Inch Metric

1 Main body LS-502

2 Main body FD-501 FS-503 External (FD-501)

3 Main body SD-501 External (SD-501)

4 Main body FD-501 SD-501 External (FD-501/SD-501)

5 Main body FD-501 SD-501 FS-503 External (FD-501/SD-501)

6 Main body FS-503

7 Main body LS-501 LS-501 FS-503 Inlet: (1st tandem LS-501) Inlet: (2nd tandem LS-501)

8 Main body LS-501 LS-502 Inlet: (LS-501)

9 Main body LS-501 FS-503 Inlet: (LS-501)


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 PRODUCT SPECIFICATIONS

1 -3

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2. PRODUCT SPECIFICATIONS

2.1 Type

Type: Console type (floor-mounted type)Copying method: Indirect electrostatic methodOriginal stand: FixedOriginal alignment: Left rear standardPhotosensitive material: OPCSensitizing method: Laser writingPaper feed trays: Two trays (1,500 sheets x 2, 20lb, 80 gsm)

PF-701 (2,000 x 3, 80 gsm) *1*1 The PF-701 is optional.

2.2 Functions

Original: Sheet, book, solid objectMaximum original size: A3, or 11 x 17Copy size:

Tray /1, /2: Inch: 12 x 18, 11 x 17, 8.5 x 14, 8.5 x 11, 8.5 x 11R, 5.5 x 8.5, A3, B4,A4, B5, B5R, 8 x 13, 8.12 x 13.2, 8.25 x 13, 8.5 x 13, widepaper (up to 324 mm x 460 mm), standard index paper

Metric:A3, B4, A4, A4R, B5, B5R, A5, 12 x 18, 11 x 17, 8.5 x 14, 8.5 x11, 8 x 13, 8.12 x 13.2, 8.25 x 13, 8.5 x 13, wide paper (up to324 mm x 460 mm), standard index paper

ADU: A3, B4, A4, A4R, B5, B5R, A5, 12 x 18, 11 x 17, 8.5 x 14, 8.5 x 11, 5.5x 8.5, 8.5 x 11R, 8 x 13, 8.125 x 13.25, 8.25 x 13, 8.5 x 13, wide paper(up to 324 mm x 460 mm)

Magnification:Fixed magnification: Inch: x 1.000, x 2.000, x 1.545, x 1.294, x 1.214, x 0.785, x 0.772,

x 0.647, x 0.500Metric:x 1.000, x 2.000, x 1.414, x 1.224, x 1.154, x 0.866, x 0.816,

x 0.707, x 0.500Special magnification setting: 3 typesZoom magnification: x 0.250 to x 4.000 (at the step of 0.1%)Vertical magnification: x 0.250 to x 4.000 (at the step of 0.1%)Horizontal magnification: x 0.250 to x 4.000 (at the step of 0.1%)

Warm-up time: Less than 6 min. (at temperature of 20C, at rated voltage)First copy out time: Less than 3.0 sec.Continuous copy speed: 105 copies/min. (for A4/8.5 x 11)Continuous copy count: Up to 9,999 sheetsCopy density selection: AE/AES, manual (9 steps), user density (2 steps)Resolution:

Scan: 600 dpi x 600 dpiWrite: 600 dpi x 600 dpi

Memory: 256 MB (DRAM) + 10 GB (HDD1)Interface section: RJ45 Ethernet, Serial port (RS232-C): Main body right side

Serial port (USB Type B), Parallel port: Mounted on the Image process-ing board (IPB)


PRODUCT SPECIFICATIONS bizhub PRO 1050/1050P Theory of Operation Ver.2.0

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No. of originals to be stored: More than 10,000 sheetsUnder the following conditions:

Original: FAX#4CHART/A4Density: Manual 5Mode: Text/photo

2.3 Type of paper

Plain paper *2: 60 g/m2 to 90 g/m2, high-quality paperSpecial paper *3: OHP film, label paper, *4

coated paper, 60 g/m2 to 90 g/m2 recycled paper, 50 g/m2 to 60 g/m2, 16lb, high-quality paper (thin), 91 g/m2 to 300 g/m2, 25lb to 72lb, high-quality paper (thick) *5

*2 Standard specified paper:Inch: Hammermill Tidal MP (75 g/m2),Metric: Konica Minolta Profi (80 g/m2),

*3 Special paper/recommended paper:Thick paper: Inch: HM-Cover65lb (176 g/m2), XeroxDigitalLasr65lb (176 g/m2),

DomterCdor65lb, COUGARCOVER65lb (176 g/m2)Metric: RDEREY200 (200 g/m2), RDEREY160 (160 g/m2), NEUCOLOR-

COPY (200 g/m2), XeroxColotech (200 g/m2), Xerox3R91798(160 g/m2)

Thin paper: Inch: Domter16lb (Doqupach16lb)Metric: Clair Mail (60 g/m2)

Label paper: Inch: AVERY 5160Metric: AVERY DSP24

Coated paper: Inch: KROMEKOTE PLUSLASER HIGH GROSS 183 g/m2 (SmartPaper Company), Futural Laser 105 g/m2 (Stora Enso Paper Company)

Metric: *4 Label paper is loaded and fed one sheet at a time.*5 245 g/m2 to 300 g/m2 paper is available only for the middle stage tray of the PF-701.

2.4 Maintenance

Maintenance: Once every 750,000 printsMachine service life: 40,000,000 prints or 7 years (whichever earlier)


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 PRODUCT SPECIFICATIONS

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2.5 Machine data

Power source: Inch: AC208V to 240V 10%, 60HzMetric: AC230V 10%, 50Hz

Power consumption: Inch: Less than 3600W (full option)Metric: Less than 3450W (full option)

Weight: 1050: Approx. 330 kg (with DF provided) / 1050P: Approx. 310 kgDimensions:

1050: W 895 mm x D 775 mm x H 1190 mm 1050P: W 895 mm x D 775 mm x H 1020 mm 1050 + PF-701 + FD-501 + FS-503: W 2902 mm x D 775 mm x H 1190 mm 1050P + PF-701 + LS-501 + LS-502: W 3292 mm x D 775 mm x H 1020 mm (with no operation board included in each case)

2.6 Operating environment

Temperature: 10C to 30C (50F to 86F)Humidity: 10% RH to 80% RH

NOTE The information herein May be subject to change for improvement without notice.


UNIT CONFIGURATION bizhub PRO 1050/1050P Theory of Operation Ver.2.0

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3. UNIT CONFIGURATION

1050to1002c

[1]

[4]

[5]

[3]

[2]

[11] [12] [13]

[8]

[10]

[9]

[7] [6]

[14]

[1] Operation panel [8] Toner supply section

[2] Write section [9] Paper exit section

[3] Developing section [10] Reverse/exit section

[4] Registration section [11] Fusing section

[5] ADU [12] Scanner section

[6] Vertical conveyance section [13] Cleaning section

[7] Paper feed section [14] Photo conductor section


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 PAPER PATH

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4. PAPER PATH

1050to1003c

[1][7][6]

[2][3][4][5]

[1] Registration conveyance [5] Reversed paper exit

[2] Tray /2 paper feed [6] Straight paper exit

[3] Tray /1 paper feed [7] ADU reverse conveyance

[4] ADU Paper feed


PAPER PATH bizhub PRO 1050/1050P Theory of Operation Ver.2.0

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Blank page


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 OVERALL COMPOSITION

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II COMPOSITION/OPERATION

1. OVERALL COMPOSITION

1.1 Timing chart when the power is on

NOTE Various types of operations vary depending on the software DIPSW setting and the environmental

settings in the service mode. The power is ON with the DF closed. The power is turned ON with the paper lift plate of the tray brought down.

1050to2322c

[4] [5] [6] [7][2][3][1]

Scanner motor (M27) F

R

Exposure lamp (L1)

Fusing heater lamps /1, /2 (L2, L3)

Fusing heater lamp /3 (L4)

Fusing motor (M1)

Charger cleaning limit sensor (PS27)

Charger cleaning motor (M23)

Charger cleaning home sensor (PS26)

Transfer/separation cleaning limit sensor (PS39)

Transfer/separationcleaning motor (M20)

Transfer/separation cleaning home sensor (PS38)

Drum motor (M2)

Developing motor (M3)

Polygon motor (M21)

Laser (LDB)

Paper lift motor /1 (M25)

Upper limit sensor (PS6)

Paper lift motor /2 (M26)

Upper limit sensor /2 (PS12)

F

R

F

R

ItemTime (sec)

[1] Power switch (SW2) on [5] Start of consumable stabilization control

[2]

[3]

Initial communication between the overall control board (OACB) and the printer con-trol board (PRCB)Shading correction starts

[6] Start of image stabilization control (for the drum potential correction control, the maxi-mum density adjustment control and the gamma correction control)

[4] The thermistor /1 (TH1) and the thermistor /3 (TH3) get to the specified temperature

[7] Warming-up completed

1050ma.book Page 1 Wednesday, March 2, 2005 3:52 PM

OVERALL COMPOSITION bizhub PRO 1050/1050P Theory of Operation Ver.2.0

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1.2 Control block diagram

1050to2005c[1][3] [2][4][6] [5]

CCD

IPB

PSSDCLFMM

APSHDD USB

I/F

Parallel

I/F

LAN

I/F

PCI

I/F

RS232C

I/F

DF

PFFD/FS/LSSDB ACDB ADUDB1

OB

Write

Section

PRCB

ADUDB2

OACB

[1] Image bus [4] UART bus

[2] Parallel bus [5] Other bus

[3] Clock-synchronized serial bus [6] Individual signal line


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 SCANNER SECTION

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2. SCANNER SECTION

2.1 Composition

[4] [5] [6] [7] [8]

[1][2][3] 1050to2006c

Symbol Item Specification/mechanism

[1] Platen mode exposure method Original stand fixed, exposure unit scan

[2] DF mode exposure method Exposure unit fixed, original scan

[3] Exposure unit cooling method (DF mode) Fan

[4] Exposure unit home position detection method

Photo sensor + stepping motor pulse control

[5] Read light reflection method V-mirror unit

[6] Exposure light source Xenon lamp 75,000 lx

[7] Original size detection method Photo sensor + CCD sensor

[8] Image read method Lens + CCD sensor


SCANNER SECTION bizhub PRO 1050/1050P Theory of Operation Ver.2.0

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2.2 Drive

[2] [1]

[3] [4] [5]

1050to2007c

[1] Scanner wire /Fr [4] Scanner wire /Rr

[2] V-mirror unit [5] Exposure unit

[3] Scanner motor (M27)



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2.3 Operation

2.3.1 Scanner/exposure lamp controlA. Operations when the power is ONWhen the power switch (SW2) is turned ON, the exposure unit conducts the home position search and theshading correction.

(1) Home position searchThe operation of the home position search varies depending on the ON/OFF condition of the scanner home sen-sor (PS51) [2].

Home position search when the scanner home sensor (PS51) is OFF.

Home position search when the scanner home sensor (PS51) is ON.

1050to2008c

[1][2]

[1] Position at which the platen APS is read [2] Scanner home sensor (PS51)

1050to2009c

[1][2]

[1] Position at which the platen APS is read [2] Scanner home sensor (PS51)



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(2) Shading correctionAfter completion of the home position search [3], the exposure unit conducts shading corrections. There arethree types of shading corrections: white correction 1 [4], white correction 2 [5] and black correction [6]. For theshading correction at the time of the power ON, these corrections are carried out in a series of operations.

1050to2010c

[2] [1]

[3]

[4]

[5]

[6]

[8]

[10]

[9]

[7]

[1] Position at which the APS is read [6] Black correction

[2] Scanner home sensor (PS51) [7] Home position search

[3] Home position search terminated [8] Standby position while in the DF mode

[4] White correction 1 [9] Exposure lamp (L1) ON

[5] White correction 2 [10] Movement of the exposure lamp



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B. Operations when the start button is turned ON(1) When the platen is in useWhen the start button is turned ON, the exposure unit conducts the shading correction and then the exposurescan. When the AE/AES is selected, the AE/AES scan [7] is made before the exposure scan is made. For theshading correction while in the exposure scan, the black correction is not conducted because of the exposurelamp being left turned on.

While in the AE/AES copy

1050to2011c

[2] [1]

[3]

[5]

[4]

[6]

[7]

[8]

[11]

[10]

[9]

[1] Position at which the APS is read [7] AE/AES scan

[2] Scanner home sensor (PS51) [8] Position at which the original is read

[3] DF close [9] Home position search

[4] Start button ON [10] Exposure lamp (L1) ON


[6] White correction 2



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While in the manual copy

1050to2012c

[2] [1]

[3]

[5]

[4]

[6]

[7]

[10]

[9]

[8]

[1] Position at which the APS is read [6] White correction 2

[2] Scanner home sensor (PS51) [7] Position at which the original is read

[3] DF close [8] Home position search





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(2) When the DF is in useWhen the start button is turned ON [3], the exposure unit conducts the shading correction and then moves tothe position at which the DF is read. The same operations are made when the AE/AES is selected. And, for theshading correction in the DF mode, the black correction is not made because of the exposure lamp being leftturned on.

1050to2013c

[2] [1]

[4]

[3]

[5]

[6]

[9]

[8]

[7]

[1] Position at which the APS is read [6] Position at which the original is read

[2] Scanner home sensor (PS51) [7] Home position search



[5] White correction 2



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2.3.2 Original size detection controlA. Detection methodThe DF mode and the platen mode is different in the detection method of the original size.

(1) DF mode See the DF-603.

(2) Platen mode In the direction of the main scan

Read by the CCD sensor. In the direction of the sub-scan

Detected by the combination of the ON/OFF of the APS sensor /1 (PS52) and the APS sensor /2 (PS53).

* For "" in the table above, either of ON and OFF is acceptable as a result of the detection.

Original size CCD sensor(Length of detection: mm)

PS52ON/OFF

PS53ON/OFF

Smallest 102.0 OFF OFF

B6R 128.0 OFF OFF

B5R 182.0 ON OFF

B5 257.0 OFF OFF

B4 257.0 ON

A5R 148.0 OFF OFF

A5 210.0 OFF OFF

A4R 210.0 ON OFF

A4 297.0 OFF OFF

A3 297.0 ON

Wide paper 304.8 ON

5.5 x 8.5R 139.7 OFF OFF

5.5 x 8.5 215.9 OFF OFF

8.5 x 14 215.9 ON

8.5 x 11R 215.9 ON OFF

8.5 x 11 279.4 OFF OFF

11 x 17 279.4 ON

16K 267.0 OFF OFF

8K 267.0 ON

16KR 195.0 ON OFF



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B. Detection timing

2.3.3 AE/AES controlWhen the AE/AES is selected, the density level of the original is detected automatically to adjust it to an appro-priate density. The sampling range of the original density when the AE/AES is controlled is different for the platenmode and the DF mode.

(1) AE/AES sampling range in the platen mode

1050to2016c

[1] [2]

RADF open/close sensor (PS301)

Exposure lamp (L1)

APS timing sensor (PS317)

[1] 1st original size detection (with DF closed) [2] 2nd original size detection

1050to2014c[1]

[1] 30 mm



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(2) AE/AES sampling range in the DF mode

2.3.4 Image processingThere are following items for the image processing. For particulars, see "19. IMAGE PROCESSING." Shading correction AE/AES processing Area discrimination Brightness/density conversion Filter/magnification Density gamma (conversion) Halftone processing (error diffusion) Tilt adjustment Compression Storage of image data

1050to2015c[1]

[2]

[1] 4 mm [2] 1 mm


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 WRITE SECTION

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3. WRITE SECTION

3.1 Composition

[1][5] [6]

[2]

[3]

[4]

1050to2017c


[1] Laser beam scan assist Collimator lens + CY1 lens + f lens + CY2 lens[2] Laser scan method Polygon mirror (6 faces) + motor

57874.02 rpm (line speed: 490 mm/s)50196.85 rpm (line speed: 425 mm/s)34251.97 rpm (line speed: 290 mm/s)

[3] Light source 1-chip 2-beam light emitting diodeOutput: 15 mW per beam

[4] Positioning method Index sensor + Index mirror

[5] Laser refraction Write mirror

[6] Polygon motor cooling method Fan


WRITE SECTION bizhub PRO 1050/1050P Theory of Operation Ver.2.0

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3.2 Operation

3.2.1 OutlineAnalog image data read by the CCD sensor is AD converted by the CCD board (CCDB) before being sent out tothe image processing board (IPB) for data processing. The image data thus processed is converted into laserbeams by the laser drive board (LDB) and written onto the drum. The laser emits 2 beams with a single laserdiode and writes 2 lines in one scan. The position at which the write starts is detected by the index board(INDEXB).The 2 image memory control ASIC's equipped on the image processing board (IPB) conduct the compression/decompression processing of the image data on the main image memory (256 MB) and the sub image memory(64 MB). This is to improve the multi access and realize the thumb-nail display function. Through the control ofthe HDD controller on the IPB, the space of 10 GB out of the large capacity hard disk /1 (HDD1) of 40 GB isused as an image memory. This space of 10 GB serves as an extension of each of the on-board image memo-ries to reduce the occurrence of memory overflow.


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 WRITE SECTION

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3.2.2 Laser beam path

3.2.3 Write controlTo prevent the mis-centering of written images, an INDEX signal detected by the index board (INDEXB) is usedto decide a reference position for writing in the direction of the drum shaft (main scan direction) and control thestarting position of the laser writing on the drum according to the paper edge detected by the centering sensor(PS54).

[1]

[8]

[2]

[3]

[4]

[5]

[6]

[7]

1050to2018c

[1] Polygon mirror [5] Drum

[2] CY1 lens [6] CY2 lens

[3] Collimator [7] Write mirror

[4] Laser diode [8] f lens


WRITE SECTION bizhub PRO 1050/1050P Theory of Operation Ver.2.0

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3.2.4 Image stabilization controlA. MPC (Maximum power control)The image processing board (IPB) indicates to the laser drive board (LDB) a maximum output value emitted bythe laser to set the maximum output value. The LDB stores this set value and maintains the amount of the laserbeam stored through the APC (automatic power control) operations.See "18. IMAGE STABILIZATION CONTROL."

(1) Execution timing When the power switch (SW2) is turned ON. After this, the MPC value is controlled by the dot diameter

adjustment control.

B. APC (Auto power control)The laser drive board (LDB) monitors the laser beam output for each scanned line. When the image processingboard (IPB) completes the MPC setting, the LDB controls the laser output to the MPC value for each scannedline.

C. Dot diameter correction controlThe patch image density on the drum is detected by the sensor on the toner control sensor board (TCSB), andthe laser drive board (LDB) controls the amount of the laser beam so that its output value becomes the specifiedvalue. See "18. IMAGE STABILIZATION CONTROL."

(1) Execution timing while in the print When selecting "auto dot diameter adjustment" in the service mode.

(2) Execution timing other than while in the print After completion of the job for each 40,000 prints on the PM counter.


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 PHOTO CONDUCTOR SECTION

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4. PHOTO CONDUCTOR SECTION

4.1 Composition

[2]

[6] [7]

[5] [4][3]

[1]

1050to2019c


[1] Environment temperature detection Drum temperature sensor (thermistor contact type)

[2] Drum potential detection method Drum potential sensor (surface electrometer)

[3] Gradation detection Gamma sensor (diffused light detection type)

[4] Paper jam prevention method Drum claw

[5] Maximum density detectionDrum jam detection

Maximum density sensor (reflective light detection type)Jam sensor (reflective light detection type)

[6] Drum OPC (99.7 mm)[7] Drum periphery cooling method Fan + duct


PHOTO CONDUCTOR SECTION bizhub PRO 1050/1050P Theory of Operation Ver.2.0

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4.2 Drive

A. Drum drive

B. Drum claw drive

[1]

[2]

[3]

1050to2020c

[1] Drum [3] Flywheel

[2] Drum motor (M2)

1050to2021c

[1]

[2]

[3]

[1] Drum claw [3] Drum motor (M2) drive input gear

[2] Drum claw solenoid (SD5)


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 PHOTO CONDUCTOR SECTION

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4.3 Operation

4.3.1 Drum claw driveA. PurposeTo prevent the occurrence of a drum wrap jam, 3 drum claws are employed to prevent the drum from beingwrapped with the copy paper. The contact and the release of contact of the drum claws onto the drum is madeby turning ON/OFF the drum claw solenoid (SD5).

B. Oscillation operationTo prevent the transfer paper from getting soiled in certain areas and the drum from being damaged, the drumclaws oscillate front to rear on the drum surface about 8 mm.There is a projection on the rear side of the drum claw unit. A cam provided on the gear presses this projectionto push the drum claw unit to the front side. When the gear rotation releases the cam, the drum claw unit isreturned to its former position by the spring. Repeating this operation oscillates the drum claws.

4.3.2 Cooling around the drumTo improve the durability of the developer, the ducts [2] are provided along the drum [4] shaft to exhaust heataround the drum.

1050to2022c[2]

[1]

[4] [3]

[1] Developing suction assembly [3] Suction filter

[2] Duct /Lw [4] Drum


PHOTO CONDUCTOR SECTION bizhub PRO 1050/1050P Theory of Operation Ver.2.0

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4.3.3 Image stabilization controlA. Drum potential correctionThe drum potential is controlled to keep the image quality at a fixed level at all times, regardless of the operatingenvironment and the number of prints.For the drum potential correction control, a latent patch is formed on the drum surface with the laser PWM set tomaximum. Next the potential difference between the latent patch and the developing bias are measured toadjust the charging current, the grid voltage and developing bias potential so that this potential differencebecomes a prescribed voltage at all times. See "18. IMAGE STABILIZATION CONTROL."

(1) Execution timing When the fusing temperature is below 50C with the power switch (SW2) ON. When the prescribed conditions (number of prints, and developing theta) are met.

B. Environmental decision controlThe temperature of the environment in which the main body is installed is detected by the drum temperaturesensor (TH5), and the environmental humidity is detected by the humidity sensor mounted in the printer controlboard (PRCB). Data thus detected are used as information to keep the image quality at a fixed level. See "18.IMAGE STABILIZATION CONTROL."

(1) Execution timing When the prescribed conditions are met with the SW2 ON.

C. Drum rotation controlWhen printing is interrupted under a high humidity environment, and under the environments of low humidity anda normal humidity, the surface sensitivity is different between the drum surface that is in contact with the devel-oping unit and the cleaning unit and the drum surface that is in touch with nothing. When printing is made in acondition like this, uneven printing is made in the sub scan direction of the paper. To prevent this, the drum isrotated at a fixed cycle for a prescribed period of time to obtain a uniform surface sensitivity. See "18. IMAGESTABILIZATION CONTROL."

(1) Execution timing Once every 3 minutes while in idling Once every hour while in the low power mode When the prescribed conditions are met with the SW2 ON


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 CHARGING SECTION

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5. CHARGING SECTION

5.1 Composition

5.2 Drive

[3][4] [2]

[1]

1050to2023c


[1] Charging method Scorotoron (DC minus corona discharge)Discharge wire: Tungsten 0.06 mm (gold plated skin pass) x 2

[2] Drum neutralizing method Erase lamp (red LED)

[3] Grid control method Gold-plated stainless mesh plate

[4] Wire cleaning method Cleaning member + motor

[1][2]

[3]

1050to2024c

[1] Charger cleaning member [3] Charger cleaning motor (M23)

[2] Charging wire


CHARGING SECTION bizhub PRO 1050/1050P Theory of Operation Ver.2.0

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5.3 Operation

5.3.1 Charging controlA. Charging wireThe high voltage unit /1 (HV1) uses 24V DC to create a negative charge current to the charging wire to chargethe drum.Charging output range: -350 A to - 1050 A x 2

B. Charging gridTo make the discharge of the charging wire uniform, a minus (-) high voltage is sent from the high voltage unit /1(HV1) to the charging grid.Charging grid voltage output range: -400V to -1000V

5.3.2 Wire cleaning controlA. PurposeThe wire is cleaned periodically to prevent the deterioration of the discharging characteristics caused by soiladhered to the charging wire.

B. TimingThe charging wire is cleaned under the following conditions: With the power switch (SW2) ON, when the number of prints counted from the execution of the previous

cleaning is in excess of the specified number and when the fusing temperature is below 50C. While in the print, executed after completion of each job of the prescribed print counts. After completion of the automatic replacement of the cleaning blade.

NOTE The number of prints at which the cleaning operation is conducted is set by the software DIPSW in

the service mode.


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 CHARGING SECTION

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C. Cleaning operationThe home position of the cleaning member is provided on the rear side of the machine. It operates as shownbelow.

5.3.3 Erase lamp controlA. PurposeTo neutralize the residual potential on the drum surface and to make the potential on the drum surface uniform,the erase lamp (EL) is turned on before charging.

B. Timing for the erase lamp to be turned on

1050to2025c

[1][2]

[3]

[4]

[5]

[6]

[1] Charger cleaning limit sensor (PS27) [4] Cleaning (reverse)

[2] Charger cleaning home sensor (PS26) [5] Home search (forward)

[3] Cleaning (forward) [6] Home search (reverse)

1050to2026c[1]

Drum motor CONT signal

Erase lamp (EL)

[1] Drum motor ON


TRANSFER/SEPARATION SECTION bizhub PRO 1050/1050P Theory of Operation Ver.2.0

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6. TRANSFER/SEPARATION SECTION

6.1 Composition

[3]

[5] [6]

[4]

[2] [1]1050to2027c


[1] Separation method AC/DC corona dischargeDischarge wire: Oxide film tungsten 0.06 mm x 2

[2] Separation wire cleaning method Cleaning member + motor

[3] Transfer assist method Transfer assist sheet + motor

[4] Transfer guide plate dirt prevention method

High voltage impression

[5] Transfer method DC positive (+) corona dischargeDischarge wire: Oxide film tungsten 0.06 mm x 1

[6] Transfer wire cleaning method Cleaning member + motor


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 TRANSFER/SEPARATION SECTION

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6.2 Drive

A. Transfer/separation cleaning drive

B. Transfer assist sheet drive

[1]

[3]

[2]

1050to2028c

[1][2]

Transfer/separation cleaning motor (M20)Transfer wire/separation wire

[3] Transfer cleaning member/separation clean-ing member

1050to2029c

[2]

[1]

[1] Transfer assist motor (M19) [2] Transfer assist sheet assembly



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6.3 Operation

6.3.1 Transfer guide controlA. PurposeTo prevent the transfer guide plate from getting soiled, a minus (-) DC voltage is sent from the high voltage unit /2 (HV2).Voltage: -500V

B. TimingThe voltage sent to the transfer guide plate is made in sync with the ON/OFF of the drum motor (M2).

6.3.2 Transfer/separation controlA. TransferThe high voltage unit /2 (HV2) uses 24V DC to generate a plus (+) DC current to the transfer wire to dischargeelectricity.Transfer DC output range: 60 A to 800 A

B. SeparationFor separation, an AC current and a minus DC current are used. The high voltage unit /2 (HV2) sends these cur-rents to the separation wire to discharge electricity.Separation AC output range: 500 A to 1400 ASeparation DC output range: 0 A to - 300 A

6.3.3 Transfer exposure lamp controlA. PurposeThe transfer exposure lamp (TSL) is turned on to enhance the transferability and prevent the reverse charge tothe drum.

B. TimingThe transfer exposure lamp (TSL) turns ON a specified period of time after the paper leading edge sensor (PS41)turns ON, and it turns OFF a specified period of time after the registration sensor (PS40) turns OFF.

C. Lighting controlThe TSL switches the light intensity according to the process speed and the paper weight. However, whenpaper weight more than 162 g/m2 is selected, the TSL does not turn on.



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6.3.4 Transfer assist controlA. PurposeTo enhance the transferability on the entire rear side of paper, the transfer assist sheet presses up the entire rearside of paper to get it in contact securely with the drum while in the transfer on the rear side. However, the sizeof paper to be operated must be larger than 297 mm (A3/A4) in the main scan direction (default for metric area),and larger than 279 mm (11 inches) (default for inch area).

B. TimingThe paper pressing operation of the transfer assist sheet is controlled so that the pressing operation is onlymade when paper is provided to prevent the transfer assist sheet from getting contact with the drum. The ON/OFF timing of the pressing operation varies according to each of the line speeds.

(1) ON timingThe transfer assist sheet turns ON at a specified distance after the leading edge of paper passes through thetransfer guide. This ON timing is based on the point at which the paper leading edge sensor (PS41) turns ON.

(2) OFF timingThe transfer assist sheet turns OFF short of a specified distance before the trailing edge of paper passesthrough the transfer guide. This OFF timing is based on the point at which the paper leading edge sensor (PS41)(PS41) turns OFF.

(3) Others When paper is found mis-centered more than 5 mm by the centering sensor (PS54), no pressure operation is

made (to prevent the drum from being damaged). The pressing operation is made only when the copy is being made on the second side of the paper. However,

the weight of paper is in excess of 91 g/m2, the pressing operation is not made even while in the copy on thesecond side of the paper.

The paper width to which the transfer assist sheet is applicable is limited. When printing paper the width ofwhich is shorter than a set width, the pressing operation is not made because of the drum getting damaged.

The pressing operation of the transfer assist sheet can be disabled by the software DIPSW. (DIPSW 6-2) For paper sizes other than default, see "4.5 PCS corresponding parts," in Field Service, Chapter II.



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6.3.5 Wire cleaning controlA. PurposeTo prevent the deterioration of the discharge characteristics caused by toner adhering to the transfer wire andthe separation wire, the wire is cleaned periodically.

B. Timing The cleaning is made when the number of prints counted from the execution of the previous cleaning is in

excess of the specified number with the power switch (SW2) ON, and when the fusing temperature is below50C.

While in the print, executed after completion of each job of the prescribed print counts.

NOTE The number of prints at which the cleaning operation is conducted is set by the software DIPSW in

the service mode.

C. Cleaning operationThe home position of the cleaning member is provided on the front of the machine. It operates as shown below.

1050to2324c

[1] [2]

[3]

[4]

[5]

[6]

[1] Transfer/separation limit sensor (PS39) [4] Cleaning (returning)

[2] Transfer/separation home sensor (PS38) [5] Home search (going)

[3] Cleaning (going) [6] Home search (returning)



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6.4 PCS correspondence

6.4.1 Transfer assist sheet by paper sizesA. PurposeFor the transfer assist sheet, the sizes of paper that can be used is limited. It does not function when a papersize is not appropriate. However, it is possible to use paper other than the standard size by replacing the trans-fer/separation charger unit in accordance with the user specifications.

B. UsageOther than the standard size of the transfer assist sheet, the following sizes are available.However, when changing to any other size than the standard, it is required to add a new relay wiring harnessand a size detection connector.It is possible to use different transfer assist sheets. On that occasion, in addition to the relay wiring harness men-tioned above, it is necessary to purchase a transfer assist sheet that is built in to the transfer/separation chargerunit.

NOTE When different sizes are used, the size detection connector is required for the transfer/separation

charger unit. The unit must be changed by the user himself, and it is necessary to give appropriate guidance

and explanation to the intended user.

Unit Type Wire color of the size detection

connector

Remarks

Transfer/separation charger unit

Used exclusively for A3, A4 Brown Default size for metric area

Used exclusively for 11 in. Red Default size for inch area

Used exclusively for 8K, 16K Orange

Used exclusively for B4, B5 Yellow

Used exclusively for 8.5 in. Pink

Used exclusively for A4R, A5 Blue

Used exclusively for 8, 8.125, 8.25 in. Purple

B5R Gray

Transfer assist sheet assembly

Used exclusively for A3, A4 Default size for metric area

Used exclusively for 11 in. Default size for inch area

Used exclusively for 8K, 16K

Used exclusively for B4, B5

Used exclusively for 8.5 in.

Used exclusively for A4R, A5

Used exclusively for 8, 8.125, 8.25 in.

Used exclusively for B5R


DEVELOPING UNIT bizhub PRO 1050/1050P Theory of Operation Ver.2.0

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7. DEVELOPING UNIT

7.1 Composition

1050to2400c[2][4] [3] [1]


[1] Developer agitation/conveyance method

Agitator screw (2) + agitator plate (1)

[2] Developer agitation/conveyance method

Agitator plate (with 6 blades)

[3] Developing roller spiking restriction method

Developer regulation blade

[4] Developing method 2 components developing method (Developer: toner + carrier)Developing roller (2 components reverse magnetic brush) Developing bias impressed: - 300V to - 800V


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 DEVELOPING UNIT

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7.2 Drive

[2]

[4]

[6]

[5]

[3]

[1]

1050to2401c

[1] Gear for the agitator screw [4] Gear for the developing roller

[2] Belt [5] Developing motor (M3)

[3] Gear for the agitator plate [6] Coupling for the developing drive



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7.3 Operation

7.3.1 Flow of developerDeveloper in the developing unit is supplied to the developing roller [3] by the agitator plates [2] and its level iskept at a fixed height by the developer regulation blade [5]. Developer that remains on the developing roller isreturned to the agitator screws [1]. There are 2 agitator screws equipped. The agitator plate furthest from thedeveloping roller is used to stabilize the charging characteristics of toner supplied to the developing unit.

1050to2402c[2]

[4] [5]

[3] [1] [2]

[1] Agitator screw [4] Drum

[2] Agitator plate [5] Developer regulation blade

[3] Developing roller



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7.3.2 Developing biasA. PurposeDuring developing, a developing bias voltage is sent to the developing sleeve so that toner is ready to adhere tothe drum.

B. TimingTo prevent unnecessary carriers from adhering to the drum, developing bias turns ON a specified period of timebefore charging is ON, and it turns OFF a specified period of time after charging is OFF.

[1]

[2]

1050to2319c

[1] Developing bias pin [2] Developing bias shaft



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7.3.3 Developing suctionA. PurposeThe developing suction fan (FM5) [1] is provided to suction toner being scattered around the developing unit andthe drum and recover it to the suction filter [4] in the developing suction assembly [2].

B. Flow of air

C. Developing suction fan controlWhile in the warm up and the print, the developing suction fan (FM5) turns ON when the drum motor (M2) turnsON, and it turns OFF a specified period of time after the M2 turns OFF.

1050to2403c

[1]

[4]

[2]

[3]

[1] Developing suction fan (FM5) [3] Duct

[2] Developing suction assembly [4] Suction filter



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7.3.4 Image stabilization controlA. Toner density controlThe toner density control detects the patch density in images written and developed under fixed conditions andadjusts either the speed of rotation of the developing roller or the toner supply time depending on the findingsobtained by comparing it to the reference value. For particulars, see "18. IMAGE STABILIZATION CONTROL."

(1) Execution timing Once every specified number of prints after the power switch (SW2) is turned ON.

B. Maximum density correction controlThe maximum density correction control is a control in which the patch, in images written under a fixed conditionis developed while changing the speed of rotation of the developing roller. The resulting developed patch densi-ties are compared to a reference density and when the developed patches are the same density as the refer-ence patch, the developer roll speed is memorized. For particular, see 18. IMAGE STABILIZATION CONTROL.

(1) Execution timing When the fusing temperature is below 50C with the SW2 ON. When the prescribed conditions (number of prints, and developing theta) are met.

C. Gamma correction controlThe gamma correction control detects the patch density in images written and developed under a fixed condi-tion, and adjusts the amount of laser beam PWM while writing depending on the findings obtained by compar-ing the patches with the reference value. For particular, see "18. IMAGE STABILIZATION CONTROL."

(1) Execution timing When the fusing temperature is below 50C with SW2 ON. When the prescribed conditions (number of prints, and developing theta) are met.


TONER SUPPLY SECTION bizhub PRO 1050/1050P Theory of Operation Ver.2.0

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8. TONER SUPPLY SECTION

8.1 Composition

[4]

[3] [1]

[2][5] [6]

1050to2035c


[1] Toner replenishment method Toner bottleToner capacity: 1600 gBottle size: 155 mm x 427 mm

[2] Toner intermediate supply method Intermediate hopperToner remaining sensor

[3] Toner conveyance method Twin air conveyance (toner pump motor + air pump motor)

[4] Toner/air separation method Separation by means of toner own weight + air bleed

[5] Toner/air mixing method Mixing in the cup sectionToner remaining sensor (used to detect an error)

[6] Toner supply method Large capacity hopperToner capacity: 1700 gToner remaining sensor x 2


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 TONER SUPPLY SECTION

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8.2 Drive

A. Toner bottle/large capacity hopper drive

[1]

[2]

[5]

[6]

[4]

[3]

1050to2325e

[1] Toner bottle motor (M16) [4] Toner hopper motor (M7)

[2] Gear for the large capacity hopper agitator shaft [5] Gear for the toner bottle rotation shaft

[3] Mixing section agitator shaft gear [6] Toner bottle



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B. Intermediate hopper/air separation drive

[1]

[2][2]

[3]

[4]

[5]

1050to2326c

[1] Air separation motor (M10) [4] Gear for the rotary valve

[2] Gear for the intermediate hopper section agitator shaft

[5] Gear for the air separation section agitator shaft

[3] Intermediate hopper motor (M11)



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8.3 Operation

8.3.1 Toner conveyance controlA. PurposeThe toner supply section of the intermediate and low speed machines is equipped near the developing unit. Forthe high speed machine that deals with a large number of prints, a toner supply section of a large capacity isrequired and it is not possible to secure a sufficient space near the developing unit. So, it is inevitable to placethe toner supply section in a location away from the developing unit. As a result, because of the distance up tothe toner supply section having to be extended, an toner conveyance mechanism to deal with the long distanceis required.As a toner conveyance device for the long distance, this machine employs the air conveyance method using thetoner pump and the air pump.

B. Toner conveyance path1. Toner put in from the bottle [1] is conveyed to the large capacity hopper [2] by the agitator operation.2. When the toner supply operation starts, toner is guided to the mixing section [3], where it is mixed with air

from the air pump [5].3. Toner mixed with air is conveyed to the air separation section [6] by the pressure from the toner pump [4].4. Toner conveyed to the air separation section drops off by its own weight to be separated from the air.5. Toner separated from the air at the air separation section is conveyed to the intermediate hopper [7] by

means of the agitator operation.6. When the toner supply operation starts, toner in the intermediate hopper is conveyed to the developing unit

[8] by means of the agitator operation.7. Finally, air passing through the air separation section is sent to the mixing section by the air pump.In this manner, a toner conveyance path is formed that circulates between the large capacity hopper and thedeveloping unit.

1050to2038c

[1]

[2]

[3]

[4][5][6]

[7]

[8]

[1] Toner bottle [5] Air pump

[2] Large capacity hopper [6] Air separation section

[3] Mixing section [7] Intermediate hopper

[4] Toner pump [8] Developing unit



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C. Pump control(1) ConfigurationIn both the toner pump and the air pump, the diaphragm [2] is reciprocated by the toner pump motor (M28) orthe air pump motor (M29) to circulate air in the pump room [3]. In this manner, air in the pump room is pressur-ized to be output.

(2) ControlEach pump motor is equipped with the pump encoder sensor to monitor the speed of the motor. When the pump motor is turned ON, if the speed of the motor fails to get to 85% of the prescribed speed

within a specified period of time, this is deemed to be an error. While in operation, if a low speed rotation below a prescribed value is detected a specified number of times in

succession, this is deemed to be an error.

[1]

[2]

[3]

[5]

[6]

[7]

[4]

1050to2039c

[1] Motor [5] Input air

[2] Diaphragm [6] Pump encoder sensor

[3] Pump room [7] Encoder

[4] Output air



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8.3.2 Toner supply controlA. PurposeWhen it is determined that toner supply is required as a result of the toner density control, toner is supplied.The intermediate hopper receives recycled toner from the cleaning section and a new toner from the air separa-tion section. The intermediate hopper mixes these and supplies them to the developing unit.

B. TimingToner is supplied when the trailing edge of paper in printing is detected. The toner supply time varies dependingon the result of the toner density control and the paper size. This is normally controlled between 0 to 0.55 sec.

8.3.3 Toner remaining detectionA. Toner remaining detectionThe intermediate hopper section is equipped with the toner remaining sensor /1 (PS31) [1] and the large capac-ity hopper [4] equipped with the toner remaining sensors /2 (PS32) [2], /3 (PS33) [3] and /4 (PS34) [5]. Depend-ing on the ON/OFF condition of the PS31, the PS32 and the PS33, the toner level is displayed on the operationpanel.

(1) Sensor position

[5]

[6]

[2] [1]

[3][4] 1050to2040c

[1] Toner remaining sensor /1 (PS31) [4] Large capacity hopper

[2] Toner remaining sensor /2 (PS32) [5] Toner remaining sensor /4 (PS34)

[3] Toner remaining sensor /3 (PS33) [6] Mixing section



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(2) Toner remaining display

*1 However, the determination is finally made a specified period of time after the toner supply door is closed.

(3) Error detectionWhen SC23-14 or SC-23-17 of the error codes that are related to the toner supply occurs, the machine

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103642636 Konica Minolta BizHub Pro 1050 1050P Theory of Operation

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