Manual de Servicio HG_HR

7/22/2019 Manual de Servicio HG_HR

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Index

Mettler-Toledo AG

Laboratory & Weighing Technologies

Market Support & Service Management

8606 Greifensee

Switzerland

+41 44 944 36 36

[email protected]

http://www.mt.com

Service manual

METTLER TOLEDOHG and HR

Moisture Analyzers

First Edition 08/2007Me

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Mettler-Toledo AG 2007, File No. 11780933 8.12 Edition 08/2007, CD No. 11780410, produced in Switzerland 070731

Chapte

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Overview of chapters
mailto:[email protected]://www.mt.com/http://www.mt.com/mailto:[email protected]


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Chapter Overview

1 - Introduction Using the Service Manual

Designation ConceptGeneral information

7 - LARS Testing and adjusting the balances with

LARS

2 - Safety Hazard warnings 8 - Adjusting in theService Menu

Adjustment possibilities without LARS

3 - Spare Parts Exploded-view drawings and spare-partslists, packaging

9 - Adjustment Data Tables of adjustment tolerances andtechnical data of the balances

4 - Checks Instructions for preventive maintenance 10 - Accessories Often used accessories

5 - Troubleshooting Problems, causes, and remedies 11 - Service Aids Software, interfaces, gages, tools

6 - Repair Instructions for repair 12 - SOPs Preventive Maintenance Instructions andReport


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11780933 8.12 08/2007 Mettler-Toledo AG 1-1

HG and HR Moisture Analyzers Chapter Overview 1 - Introduction

1 Introduction

List of Contents

1.1 Service Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21.1.1 Purpose of the Service Manual . . . . . . . . . . . . . . . . . 1-21.1.2 Previous Knowledge Required . . . . . . . . . . . . . . . . . 1-21.1.3 Service Manual Structure . . . . . . . . . . . . . . . . . . . . . 1-21.1.4 Navigating on the Screen . . . . . . . . . . . . . . . . . . . . . 1-3

1.2 Designation Concept. . . . . . . . . . . . . . . . . . . . . . . . 1-41.2.1 Type Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

1.2.2 Serial Number Decoding. . . . . . . . . . . . . . . . . . . . . . 1-51.3 Type Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

1.4 Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

1.5 Document Status . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9


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HG and HR Moisture Analyzers Chapter Overview 1 - IntroductionService Manual

1.1 Service Manual

1.1.1 Purpose of the Service Manual

The Service Manual (SMA) provides support to service personnelof METTLER TOLEDO, or other persons authorized by MET-

TLER TOLEDO, when performing maintenance and repairs onthe unit(s) described in this Service Manual.

1.1.2 Previous Knowledge Required

Persons using the Service Manual must fulfill the following basicknowledge requirements regarding the handling of METTLER

TOLEDO products and associated software:

Understanding of the Operating Instructions of the respectiveequipment (see LabTec service expert DVD orhttp://www.extranet.mt.comLabTec Market Support).

Experience with LARS (LabTec Repair and Service Software). Ability to load new software into the balance from the Internet

using LARS (see LabTec service expert DVD orhttp://www.extranet.mt.comLabTec Market Support).

Basic knowledge of using Adobe Acrobat Reader

METTLER TOLEDO offers service courses which include thisbasic knowledge.

1.1.3 Service Manual Structure

The sequence of the 12 chapters largely corresponds to thesequence of the operations for repairing a balance:

checking troubleshooting repair adjustment

The Service Manual is designed for display on a computerscreen.

Tables of Contents / Index

Tools for rapid location of the required information:

Chapter Overview Index Table of contents for each chapter

Header

left center right

Instrument Name Link to Chapter Overview Chapter NameSubsection

Footer

SMA Number, Issue Date Chapter Number-Page Number
http://www.extranet.mt.com/http://www.extranet.mt.com/http://www.extranet.mt.com/http://www.extranet.mt.com/


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HG and HR Moisture Analyzers Chapter Overview 1 - IntroductionService Manual

1.1.4 Navigating on the Screen

For navigation in the Service Manual, use the functions of AdobeAcrobat Readeror the (blue) hyperlinks in the document.

Navigation with Adobe Acrobat Reader

Full-screen mode

Navigation using the Adobe Acrobat Readertoolbar:

A Open/close the navigation window B

C Zoom

D Page forward/backward

E Go to start/end of document

F Go to Previous View(e.g. return to the page with the "link origin")

G Go to Next View (e.g. from the page with the "link origin"back to the "linked page")

B

D EE F G

C

A

Note: Full-screen mode is functioning only when the documenthas been downloaded. It does not work when opening the docu-ment on the Service-DVD!

In full-screen mode, the document is displayed without the tool-bar.

Key combinations for navigation in full-screen mode:

Ctrl+L Switch to full-screen

Esc Reset to normal view

Ctrl++ Zoom in

Ctrl-- Zoom out

Page forward/backward

Alt+ Return to previous view/page


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HG and HR Moisture Analyzers Chapter Overview 1 - IntroductionDesignation Concept

1.2 Des ignation Concept

1.2.1 Type Plate

A Type designation

B Serial number (SNR)

C Type definition number (TDNR) of moisture analyzer whenleaving the factory.

B

C

A


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HG and HR Moisture Analyzers Chapter Overview 1 - IntroductionDesignation Concept

1.2.2 Serial Number Decoding

as of 2004 - example with SNR 1125010001

11 25 01 0001

0001 =consecutive number within a production week

01 =production week (01 - 52)

25 =production year 2004. Offset =21 (26 =2005) etc.

11 =production site Switzerland / 12 =production site China

up to 31.12.2003 production site Switzerland, example with SNR 1118420763

11 18 42 0763

0763 =consecutive number within a production week42 =production week (01 - 52)

18 =production year 1999. Offset =19 (24 =2005)

11 =MTLabTec (Switzerland)

up to 31.12.2003 production site China, example with SNR 1202440020

12 02 44 0020

0020 =consecutive number within a production week

44 =production week (01 - 52)

02 =production year (05 =2005)

12 =MTCS (China)

Link to Serial Number Decoder on Extranet: http://www.extranet.mt.com/lab/technic/technic.asp
http://www.extranet.mt.com/lab/technic/technic.asphttp://www.extranet.mt.com/lab/technic/technic.asp


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HG and HR Moisture Analyzers Chapter Overview 1 - IntroductionType Overview

1.3 Type Overview

Type Designation Weighing cell

HG53

HG63

HR73

HR83

00214670

Spare parts Top housing, CPU- and power supply board, sample chamber drive see Section3.1Sample chamber and ventilation see Section3.2Sample chamber with weighing cell see Section3.3Dryer unit see Section3.4

Menu

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HG and HR Moisture Analyzers Chapter Overview 1 - IntroductionType Overview

HG-F

HG-F-P

00214670

Spare parts Top housing, CPU- and power supply board, sample chamber drive see Section3.1Sample chamber and ventilation see Section3.2Sample chamber with weighing cell see Section3.3Dryer unit see Section3.4

Type Designation Weighing cell


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HG and HR Moisture Analyzers Chapter Overview 1 - IntroductionAbbreviations

1.4 Abbreviations

/A Certified balance country specific (except European countries)

c/w complete with

CW Clockwise

CCW Counter Clockwise

HB Halogen Basic

HG Halogen Standard

HR Halogen Professional

LARS LabTec Repair and Service Software

MJ Moisture J unior

/M Certified balance Europe

SMA Service Manual

SNR Serial Number

SOP Standard Operating Procedure

SW Software

TDNR Type Definition Number

w/o without


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HG and HR Moisture Analyzers Chapter Overview 1 - IntroductionDocument Status

1.5 Document Status

Document number Date of change Modified pages Short description of Change

11780933 8.12 08/2007 First edition


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HG and HR Moisture Analyzers Chapter Overview 2 - Safety

2 Safety

List of Contents

2.1 Before starting service work . . . . . . . . . . . . . . . . . 2-2

2.2 Pictograms used in this manual . . . . . . . . . . . . . . 2-2

2.3 Text markers used. . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

2.4 Disposal of service material and replaced parts . 2-2

2.5 State of the art . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2


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HG and HR Moisture Analyzers Chapter Overview 2 - SafetyBefore starting service work

2.1 Before starting service work

Read the Operating Instructions to familiarize yourself with thefunctions of the system.

Observe all safety instructions in this Service Manual.

Observe any safety instructions received from the customer.Be specially sure to observe safety instructions which areclosely related to your service work.

2.2 Pictograms used in this manual

2.3 Text markers used

2.4 Disposal of service material and

replaced parts

Service materials (cleaning cloths, cleaning agents, etc.) andreplaced parts must be disposed of:

in accordance with the specific customer's regulations

in accordance with the specific regulations of the respective

country.

2.5 State of the art

This Service Manual corresponds to the state of the art at thedate of issue (e.g. 08/2007).

General warning

Warning of an electric voltage

Warning of a hot surface

Warning of flammable material

Electrostatic sensitive devices

General attention

WarningAt tention

Note

Important information regarding handling


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HG and HR Moisture Analyzers Chapter Overview 3 - Spare Parts

3 Spare Parts

List of Contents

3.1 Housing, CPU- and Power Supply Board,Sample Chamber Drive . . . . . . . . . . . . . . . . . . . . . . 3-2

3.2 Drawer Compartment, Ventilation . . . . . . . . . . . . . 3-3

3.3 Sample Chamber with Weighing Cell . . . . . . . . . . 3-4

3.4 Dryer Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

3.5 Weighing Cell. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-63.6 Packaging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7


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HG and HR Moisture Analyzers Chapter Overview 3 - Spare PartsHousing, CPU- and Power Supply Board, Sample Chamber Drive

3.1 Housing, CPU- and Power Supply Board, Sample Chamber Drive

1) For types without printer, i.e.HR73, HR83, HG53, HG63, HG-F

(HR73-P, HR83-P, HG53-P, HG63-P, HG-F-P: with printer)

46

3651

11

44

48 49

47

16

50

14

17

18

15

13

9

10

53

54

55

45

12

40

Item Designation Part No.

HR73 HR83 HG53 HG63 HG-F

9 CPU board 00214405 00214405 00214405 00214405 0021440510 Program EPROM 00214671 00214760 00214671 00214760 00214755

11 Rechargeable battery 00086330 00086330 00086330 00086330 00086330

12 Backlighting 00214426 00214426 00214426 00214426 00214426

13 Sample chamber drive 00214675 00214675 00214675 00214675 00214675

14 Power supply board 00214411 00214411 00214411 00214411 00214411

15 Power receptacle 00089928 00089928 00089928 00089928 00089928

16 CAN port 00225031 00225031 00225031 00225031 00225031

17 CAN cover 00225027 00225027 00225027 00225027 00225027

18 Microfuse cap 00089290 00089290 00089290 00089290 00089290

36 Sample chamber cable with

connection board

00214697 00214697 00214697 00214697 00214697

40 EMC spring, front 00214644 00214644 00214644 00214644 00214644

44 Top housing (with keypad) 00214676 00214762 00214677 00214761 00214756

45 Membrane keypad with cable 00214364 00214721 00214352 00214720 00214750

46 Level cover 00210374 00210374 00210374 00210374 00210374

47 Model strip 00214365 00214722 00214353 00214722 00214722

48 Cover without paper slot 1) 00214324 00214324 00214324 00214324 00214324

49 Cover with paper slot 00214444 00214444 00214444 00214444 00214444

50 Bottom housing 00214320

00214726

00214726 00214320

00214726

00214726 00214726

51 Leveling screw 00214337 00214337 00214337 00214337 00214337

53 Printing unit 00214681 00214681 00214681 00214681 00214681

54 Printer board with holder 00214673 00214673 00214673 00214673 00214673

55 Holder for printer 00214372 00214372 00214372 00214372 00214372


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HG and HR Moisture Analyzers Chapter Overview 3 - Spare PartsDrawer Compartment, Ventilation

3.2 Drawer Compartment, Ventilation

28

23

27

26

41

37

20

13

22

21

25

22

19

24

52



19 Level 00238311 00238311 00238311 00238311 00238311

20 Pivot bearing, left 00214329 00214329 00214329 00214329 00214329

21 Pivot bearing, right 00214330 00214330 00214330 00214330 00214330

22 Closure lever 00214395 00214395 00214395 00214395 00214395

23 Contact block housing 00214331 00214331 00214331 00214331 00214331

24 Contact block 00299037 00299037 00299037 00299037 00299037

25 Radiator cable 00214427 00214427 00214427 00214427 00214427

26 Temperature sensor 00214349 00214349 00214349 00214349 00214349

27 Fan 00214622 00214622 00214622 00214622 00214622

28 Air duct, rear 00214613 00214613 00214613 00214613 00214613

37 Transport safety 00214757 00214757 00214757 00214757 00214757

41 EMC spring, rear 00214643 00214643 00214643 00214643 00214643

52 Guide rail 00214328 00214328 00214328 00214328 00214328


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HG and HR Moisture Analyzers Chapter Overview 3 - Spare PartsSample Chamber with Weighing Cell

3.3 Sample Chamber with Weighing Cell

1) Use repair kit item 60

57

30

29

31

32

58

38

36

35

59

39

43

42

33

61

34

39

63 62



29 Draft shield 00214368 00214368 00214368 00214368 00214368

30 Sample pan holder 00214642 00214642 00214642 00214642 00214642

31 Heat shield 00214624 00214624 00214624 00214624 00214624

32 Sample chamber front 00214393

00214733

00214733 00214393

00214733

00214733 00214733

33 Guide roller, lower, 1 piece 00214327

1)

00214327 00214327

1)

00214327 00214327

34 Supporting roller, lower,

1 piece

00214480

1)

00214480 00214480

1)

00214480 00214480

35 Weighing cell 00214670 00214670 00214670 00214670 00214670

38 Bearing sleeve 00214386 00214386 00214386 00214386 00214386

39 Tension spring 00214496 00214496 00214496 00214496 00214496

42 Gear rack 00214332 00214332 00214332 00214332 0021433243 EMC compression spring 11600064 11600064 11600064 11600064 11600064

57 Sample pan handler 00214526 00214526 00214526 00214526 00214526

58 Weighing cell cable 00214634 00214634 00214634 00214634 00214634

59 Cell cable 00224409 00224409 00224409 00224409 00224409

60 Repair kit 00214747 ---------- 00214747 ---------- 00214747

61 Supporting roller, upper, 2 pcs 1) 00214764 1) 00214764 00214764

62 Guide roller, upper, 2 pcs 1) 00214763 1) 00214763 00214763

63 Drawer bottom 00214371 00214371 00214371 00214371 00214371


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HG and HR Moisture Analyzers Chapter Overview 3 - Spare PartsDryer Unit

3.4 Dryer Unit

3

1

5

56

4

2

6

8

7



1 Dryer unit housing 00214344

00214734

00214734 00214344

00214734

00214734 00214734

2 Halogen radiator 110V 00214417 00214417 00214417 00214417 00214417

Halogen radiator 230V 00214418 00214418 00214418 00214418 00214418

3 Dryer unit 110V 00214737 00214737 00214737 00214737 00214737

Dryer unit 230V 00214738 00214738 00214738 00214738 00214738

4 Protective glass 00214360 00214360 00214360 00214360 00214360

5 Reflector 00214382 00214382 00214382 00214382 00214382

6 Over-temperature switch 00214698 00214698 00214698 00214698 00214698

7 Metal contact, left 00214355 00214355 00214355 00214355 00214355

8 Metal contact, right 00214356 00214356 00214356 00214356 00214356

56 Heater housing 00214326 00214326 00214326 00214326 00214326


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HG and HR Moisture Analyzers Chapter Overview 3 - Spare PartsWeighing Cell

3.5 Weighing Cell

2

4

5

8

3

5

10

7

9

1

Item Designation Note Part No.

1 Weighing cell complete 00214670

2 Detector 002244023 Ref. resistor 0.5W 0.5% 680 00081873

4 Lever 00600166

5 Contact strips 10 pcs 00043540

6 Hook 00224157

7 Guide, upper

1 Upper guide

4 Cup washer

4 Screw M4 x 10 mm

00600161

8 Guide, lower

1 Lower guide

4 Conical spring washer4 Screw M4 x 10 mm

00600160

9 Flexible bearing

12 Screw M4 x 16 mm

12 Cup washer

6 pcs 00600158

10 Link

Cup washer

6 Screw M4 x 16 mm

6 Screw M4 x 20 mm

6 pcs 00600164


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HG and HR Moisture Analyzers Chapter Overview 3 - Spare PartsPackaging

3.6 Packaging


1 Export Carton 00214605

3 Complete Export Carton with foam packaging 00214765


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HG and HR Moisture Analyzers Chapter Overview 4 - Checks

4 Checks

List of Contents

4.1 Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

4.2 Performing the Checks . . . . . . . . . . . . . . . . . . . . . . 4-2


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HG and HR Moisture Analyzers Chapter Overview 4 - ChecksInstructions

4.1 Instructions

Please find the instructions as what to look for and how to pro-ceed in the document

Preventive Maintenance - Instructions (Chapter12)

4.2 Performing the Checks

Note that for certain tasks, e.g. Function Check, the systemneeds to be acclimatized for approx. 30 minutes.

Print out the document

Preventive Maintenance - Report

inChapter12and fill in the form as you proceed with preventive

maintenance.


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HG and HR Moisture Analyzers Chapter Overview 5 - Troubleshooting

5 Troubleshooting

List of Contents

5.1 Hardware Related Problems. . . . . . . . . . . . . . . . . . 5-2

5.1.1 Moisture Analyzer cannot be switched on. . . . . . . . . 5-2

5.1.2 Some Keys do not respond. . . . . . . . . . . . . . . . . . . . 5-2

5.1.3 Keypad does not function . . . . . . . . . . . . . . . . . . . . . 5-2

5.1.4 Halogen Lamp does not switch on after Start. . . . . 5-3

5.1.5 Add on Printer does not print some Characters . . . . 5-3

5.1.6 Sample Chamber does not move in and out. . . . . . . 5-4

5.1.7 Sample Chamber does not open/close completely. . 5-45.1.8 Wrong instrument designation on print-outs

or in LARS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

5.2 Indications from Display. . . . . . . . . . . . . . . . . . . . . 5-5

5.2.1 Some Pixels of the Display do not light up . . . . . . . . 5-5

5.2.2 Temperature Indication rises above 205 C . . . . . . . 5-5

5.2.3 Unstable Weight Indication . . . . . . . . . . . . . . . . . . . . 5-5

5.2.4 Hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

5.2.5 System Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

5.2.6 Error Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6


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HG and HR Moisture Analyzers Chapter Overview 5 - TroubleshootingHardware Related Problems

5.1 Hardware Related Problems

5.1.1 Moisture Analyzer cannot be switched on

5.1.2 Some Keys do not respond

5.1.3 Keypad does not function

Error symptom Possible cause Diagnostic Remedy

Moisture analyzer

cannot be switched

on

1 Power supply cable not connected

or no power supply voltage

Check Connect mains cable or reestablish mains supply

voltage.

2 Blown fuse Check The power supply is designed for 100...240 VAC, the

drying unit however for 110 or230 VAC. Checkwhether the correct drying unit is installed. Thenreplace the fuse.

3 Cable inside instrument discon-nected or faulty

Check Connect or replace cable.

4 Faulty power supply board Check Replace power supply board, see Section6.3.16.


Some keys do not

respond

1 "Key protection" or "Procedures offselected

Check Select "Key protection off" and in item 14 "Proce-dures on (see Operating Instructions)

2 Conductive path of keypad cableinterrupted due to kink in cable

Check Replace membrane keypad,see Section 6.3.5.


Keypad does not

function

1 Keypad cable disconnected Check Connect keypad cable, see Section 6.2.2.

2 Keypad faulty Check Replace Membrane Keypad, see Section 6.3.5.


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5.1.4 Halogen Lamp does not switch on after Start

5.1.5 Add on Printer does not print some Characters


Halogen lamp does

not switch on after

Start

1 Over-temperature switch hasresponded

Check Press switch with finger to reset, or on older versionswait 10 minutes until it resets automatically, seeSection 6.3.3.

2 Faulty over-temperature switch Check resistance Replace over-temperature switch if resistance after

resetting is >1 Ohm, see Section 6.3.3.

3 Lamp contacts of drying unit bent orfaulty

Check Replace contact block, see Section6.3.8, or contactplate, see Section 6.3.8.

4 Faulty halogen lamp Check resistance of lamp and lampvoltage

Replace halogen lamp if resistance is >20 Ohm,(check whether 110 or 230 VAC). See Section6.3.2.

5 Temperature sensor disconnected Check Connect temperature sensor, see Section 6.3.7.

6 Faulty temperature sensor Check Replace temperature sensor, see Section6.3.7.

7 Faulty sample chamber cable Check Replace sample chamber cable,see Section6.3.22.

8 Faulty power supply board Check Replace power supply board, see Section6.3.16.

9 Faulty CPU board Check Replace CPU board, see Section6.3.12.


Add on pr int er does

not print some char-

acters

1 Printer board not plugged in straightso some pins are bent at an angleand without contact

Check Remove printer and straighten pins.


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5.1.6 Sample Chamber does not move in and out

5.1.7 Sample Chamber does not open/close completely

5.1.8 Wrong instrument designation on print-outs or in LARS


Sample chamber

does not move in

and out

1 Plug of sample chamber drive dis-connected

Check Connect, see Section 6.3.22.

2 Toothed belt of sample chamberdrive faulty

Check Replace sample chamber drive,see Section6.3.18.


Sample chamber

does not open/close

completely,

changes direction

on the way

1 Old type rollers installed Rollers without bearings Replace all rollers with Repair Kit item60(page 3-4).See Section6.3.21.

2 Soiled rails or rollers Clean rails or rollers


Wrong instrument

designation on

print-outs or in

LARS

1 CPU PCB was previously installedin another instrument (e.g. for 'trialand error')

Memorizing effect of (previous)instrument name

Reset PCB (short-circuit keyboard connector pins),see Section6.3.12.


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HG and HR Moisture Analyzers Chapter Overview 5 - TroubleshootingIndications from Display

5.2 Indicat ions from Display

5.2.1 Some Pixels of the Display do not light up

5.2.2 Temperature Indication rises above 205 C

5.2.3 Unstable Weight Indication


Some pixels of the

display do not light

up

1 Display or display drive faulty Replace display, see Section 6.3.12.


Temperature i ndica-

tion rises above

205 C

1 Faulty temperature sensor Check Replace temperature sensor, see Section6.3.7.

2 Faulty power supply board Check Replace power supply board,see Section6.3.16.

3 Faulty CPU board Check Replace CPU board, see Section6.3.12.


Unstable weight

indication (repeat-

edly Error 1 ), poor

repeatability ofmeasurement

results, or tempera-

ture jumps

1 Soiled weighing cell Check Clean weighing cell.

2 Fatigue breakage of sample cham-ber cable (usually the gray colored

version)

Check Check cable and replace if necessary,see Section6.3.22.


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HG and HR Moisture Analyzers Chapter Overview 5 - TroubleshootingIndications from Display

5.2.4 Hysteres is

5.2.5 System Errors

5.2.6 Error Messages

Error messages are dealt with in the Operating Instructions. Only Error 9 asks for intervention by a Service Technician.


Hysteresis Support bushing of the sample pan car-rier catches in hole of sample chamberfront

Check Properly position weighing cell in sample chamberchassis, see Section 6.4.1.


System errors Memory error Undefined system errors Clear RAM Disconnect power. Press and hold the reset key while reconnecting

the power. Display shows RAM lost. Manually enter customer settings.

If the error persists, replace CPU PCB,see Section6.3.12.


Error 9 Memory error Undefined system error Clear RAM Disconnect power.

Press and hold the reset key while reconnecting

the power. Display shows RAM lost. Manually enter customer settings.

If the error persists, replace CPU PCB,see Section6.3.12.


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HG and HR Moisture Analyzers Chapter Overview 6 - Repair

6 Repair

List of Contents

6.1 General Instructions for Repair . . . . . . . . . . . . . . . 6-26.1.1 ESD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

6.2 Preparation Work for Component Replacement . 6-36.2.1 Remove / Install the Dryer Unit . . . . . . . . . . . . . . . . . 6-36.2.2 Remove / Install the Top Housing . . . . . . . . . . . . . . . 6-46.2.3 Remove / Install Sample Chamber . . . . . . . . . . . . . . 6-56.2.4 Remove / Install the Dryer Unit Support . . . . . . . . . . 6-66.2.5 Remove / Install the Front Air Duct . . . . . . . . . . . . . . 6-8

6.2.6 Remove / Install the Power Supply Screening Plate. 6-9

6.3 Replacing Unit Components . . . . . . . . . . . . . . . . 6-106.3.1 Protective Glass . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-106.3.2 Halogen Radiator. . . . . . . . . . . . . . . . . . . . . . . . . . . 6-126.3.3 Left or Right Contact or Over-Temperature Switch. 6-136.3.4 Replacing Printing Unit or Printer Board . . . . . . . . . 6-146.3.5 Replacing the Membrane Keypad. . . . . . . . . . . . . . 6-166.3.6 Replacing the Top Housing. . . . . . . . . . . . . . . . . . . 6-176.3.7 Replacing the Temperature Sensor. . . . . . . . . . . . . 6-186.3.8 Replacing the Contact Block Housing or the

Contact Block or Rear Air Duct . . . . . . . . . . . . . . . . 6-196.3.9 Replacing the Fan. . . . . . . . . . . . . . . . . . . . . . . . . . 6-216.3.10 Replacing the Pivot Bearings . . . . . . . . . . . . . . . . . 6-226.3.11 Replacing the Level. . . . . . . . . . . . . . . . . . . . . . . . . 6-236.3.12 Replacing the CPU PCB . . . . . . . . . . . . . . . . . . . . . 6-246.3.13 Replacing the Program EPROM . . . . . . . . . . . . . . . 6-256.3.14 Replacing the rechargeable battery. . . . . . . . . . . . . 6-25

6.3.15 Replacing the Backlighting . . . . . . . . . . . . . . . . . . . 6-266.3.16 Replacing the Power Supply PCB . . . . . . . . . . . . . 6-276.3.17 Replacing Heat Shield or Sample Chamber Front . 6-296.3.18 Replacing the Sample Chamber Drive . . . . . . . . . . 6-306.3.19 Replacing the Gear Rack . . . . . . . . . . . . . . . . . . . . 6-316.3.20 Replacing the Guide Rails . . . . . . . . . . . . . . . . . . . 6-326.3.21 Replacing the Guide and Supporting Rollers . . . . . 6-336.3.22 Replacing the Sample Chamber Cable. . . . . . . . . . 6-34

6.3.23 Replacing the Bottom Housing. . . . . . . . . . . . . . . . 6-356.4 Weighing cell. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-366.4.1 Replacing the Weighing Cell. . . . . . . . . . . . . . . . . . 6-366.4.2 Replacing Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-396.4.3 Replacing the Guides . . . . . . . . . . . . . . . . . . . . . . . 6-406.4.4 Replacing the Lever . . . . . . . . . . . . . . . . . . . . . . . . 6-416.4.5 Replacing the Detector . . . . . . . . . . . . . . . . . . . . . . 6-43

6.5 Weighing Cell Adjustments . . . . . . . . . . . . . . . . . 6-446.5.1 Hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-446.5.2 Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-456.5.3 Eccentricity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-466.5.4 Level Zero. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-48

6.6 Tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-496.6.1 Thermal Overload. . . . . . . . . . . . . . . . . . . . . . . . . . 6-49


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HG and HR Moisture Analyzers Chapter Overview 6 - RepairGeneral Instructions for Repair

6.1 General Instructions for Repair

6.1.1 ESD

WARNING

Electrical shock hazard

Unplug power supply cable before disassembly.

WARNING

Electrostatic sensitive devices.

Always use antistatic kit when working on electroniccomponents.

When removing and installing the Weighing cell, do not touchdetector board and cable contacts.

If no workplace with ESD protection is available, always touchthe bottom housing or any other metal part of the balance be-fore any contact with the electronics. Following this action, theboard and the balance are at the same electrical potential asthe person performing the work.

Boards which are returned for repair must be packaged in theoriginal antistatic packaging regardless of the fault.

EEPROMs kept outside the balance must be stored on con-ductive foam.

If soldering work is performed on the boards, a soldering iron

isolated from the power supply (isolating transformer) is rec-ommended.

Components which are sensitive to electrostatic dis-charge are marked with an ESD protection symbol.


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HG and HR Moisture Analyzers Chapter Overview 6 - RepairPreparation Work for Component Replacement

6.2 Preparation Work for Component Replacement

6.2.1 Remove / Install the Dryer Unit

Removal

WARNING

Al low dryer un it to cool before disassembly!

1 Open sample chamber (when closed, the sample chambermechanically blocks the dryer unit), then swing open dryerunit.

2 Disengage hinge (turn the two yellow closure levers at the

left and right 90 forward).3 Withdraw dryer unit forward.

Installation

Install the dryer unit in reverse dismantling order.


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6.2.2 Remove / Install the Top Housing

Removal

1 Push instrument a few centimeters over the edge of thebench to unscrew the 3 screws (a) in the bottom housing.

2 Dismantle dryer unit, see Section6.2.1.

3 Unscrew screws (b) in the top housing (the one on the rightis in the printer compartment).

4 Retract printer paper.

5 Lift off top housing, disconnect keypad cable and removetop housing.

Installation

1 Connect keypad cable to CPU board. Do not kink cable!

2 Mount top housing horizontally from above so that the fangasket lies precisely between the guide ribs. Fasten with the2 screws (b) from above and the 3 plastic screws (a) frombelow.

3 Thread printer paper through.

4 Install dryer unit, see Section6.2.1.

a

b


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6.2.3 Remove / Install Sample Chamber

Removal

1 Open sample chamber.

2 Remove sample pan support with sample pan and samplepan holder.

3 Unscrew switch vane (a).

4 Carefully withdraw sample chamber (ribbon cable connec-tion) until the ribbon cable is visible.

5 Disconnect ribbon cable connector and withdraw samplechamber completely.

Installation

Note: It may be necessary to grease the axles of the supportingand guide rollers as well as the slide rails of the rear air duct.Ensure that the roller faces and their guide rails remain free fromgrease. (Special grease for plastic; service case).

1 Connect ribbon cable.

2 Push in sample chamber and insert rear air duct into frontone.

3 Screw switch vane in the middle of the oblong holes (if thesample chamber can be heard to touch something during

motorized closure, position switch vane farther back in thelong holes).

4 Lift up sample chamber drive a short way and screw inplace so that the meshing of the pinion in the gear rack isfree from play.

a


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6.2.4 Remove / Install the Dryer Unit Support

Removal

1 Remove top housing, see Section6.2.2.

2 Remove temperature sensor, see Section6.3.7.

3 Remove fan, see Section6.3.9.

4 Remove cables from dryer unit support.

5 Unscrew sample chamber drive (a).

6 Remove sample chamber, see Section6.2.3.

7 Unscrew dryer unit support (b), turn carefully to the right andtake off.

b

a


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Installation

1 Screw on dryer unit support (b) using the two left screwsand the right rear screw (do not tighten the screws).

2 Install dryer unit, see Section6.2.1.3 Now move closed dryer unit together with the dryer unit sup-

port so that the dryer unit lies against the left side of the bot-tom housing. Then tighten the two rear screws of the dryerunit support.


5 Tighten left, front screw of the dryer unit support. With theright front screw simultaneously tighten the rear EMC con-tact spring (c) (center with the rib of the bottom housing).

6 Fix cable to the dryer unit support.

7 Install fan, see Section6.3.9and temperature sensor, seeSection6.3.7.

8 Install sample chamber drive (a).

9 Install sample chamber, see Section6.2.3.

10 Mount top housing, see Section6.2.2.

b

a

c


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6.2.5 Remove / Install the Front Air Duct

Removal

1 Remove sample pan support with sample pan as well assample pan holder and draft shield.

2 Unscrew sample chamber front and remove.

3 Bend white plastic latches on left of air duct a short way tothe left and at the same time lift up air duct at left and pulloff to the left.

Installation

1 Remount air duct and engage. Do not forget the two EMC

compression springs on the left and right (between air ductand sample chamber frame).

2 Mount sample chamber front with heat shield and screw inplace.

3 Mount draft shield, sample pan holder, sample pan supportand sample pan.


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6.2.6 Remove / Install the Power Supply Screening Plate

Removal

1 Unscrew built-in printer retaining screw on the left and liftprinter out with a slight to and fro movement.

2 Unscrew power supply screening plate and place on theleft.

Installation

1 Screw on power supply screening plate (2 screws withwashers at rear and 2 screws with washers on the right).

2 Screw on the front EMC contact (a) spring with the fifthscrew and washer. Make sure the contact is centered withthe rib of the bottom housing.

3 Insert built-in printer, connect to power supply board at thebottom and fix with screw.

a


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HG and HR Moisture Analyzers Chapter Overview 6 - RepairReplacing Unit Components

6.3 Replacing Unit Components

6.3.1 Protective Glass

Removal

1 Remove dryer unit, see Section6.2.1.

2 Remove heating module from the dryer unit as follows: With your left thumb, press the black latch hard down-

ward and at the same time use your right thumb and fore-finger to push the heating module approx. 3 mm to theleft over the latch.

Use both thumbs to pull the complete heating moduleover the latch until you hear it disengage. Then lift it outof the dryer unit.

Push protective glass with reflector to the rear and re-

move from the heating module.


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Installation

1 Insert new protective glass; the slot in the glass must lie on

the side of the contacts of the halogen radiator.2 Insert reflector in the heating module right to the bottom.

3 Lay down dryer unit so that the hinge points to the front.

4 Insert complete heating module in the dryer unit so that ittouches at the back (arrow).

5 Using the balls of the thumbs, press the heating moduledown hard at the left and right while simultaneously pullingit to the back with your forefingers until you hear it engage.


HG d HR M i t A l Ch t O i 6 R i


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6.3.2 Halogen Radiator

Removal


2 Dismantle protective glass, see Section6.3.1.3 Pull off the two connectors (a) of the halogen radiator using

flat-nose pliers.

4 Use both forefingers to spread the retaining spring (b) to theleft and right and at the same time use both thumbs to liftthe halogen radiator upward out of the retaining spring (thetwo ends of the halogen radiator must not be bent towardeach other or apart, otherwise the glass tube will break).

Installation

At tention

Touch only the black part of the halogen radiator! Ifnecessary, clean with weak organic solvent.

5 Hold the new halogen radiator by the black ends and insertit into the two metal supports (c) at the back.

6 Place the flat connector side of the halogen radiator on theretaining springs at the front, use both thumbs to press it

about 2 mm to the back against the metal support platesand then down to engage in the clamping springs.

7 Reconnect the 2 connectors of the halogen radiator.

8 Install the protective glass, see Section6.3.1.

9 Install the dryer unit, see Section6.2.1.

a

b

c

c



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6.3.3 Left or Right Contact or Over-Temperature Switch

1 Open sample chamber, then swivel upwards the dryer unit.

2 Pull off relevant cable connector using flat-nosed pliers.

3 Replace left or right contact (e) or over-temperature switch(d). Do not forget spacing washer (c) on heat conductingplate (a)! Tighten nut (b) to 1.2Nm.

Warning

The right-hand connector o f the switch andthe connector of the left-hand contact p latemust not touch each other!

4 After replacing the over-temperature switch, perform aheater test using LARS.

If over-temperature switch has responded, reset with finger (donot push spring under edge of base!).

a

b

c

a

d

e



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6.3.4 Replacing Printing Unit or Printer Board

Removal

1 Swing open printer cover.

2 Pull paper out of printing unit.3 Remove printer retaining screw at left.

4 Remove model strip: disengage by pulling up at left, pull off to the left.

5 Carefully pull built-in printer up and out of the HG/HR mov-ing it to and fro slightly.

6 Remove printer board as follows: disconnect printer cable, bend left and right retaining lug away from the printer

board and at the same time push the printer board over

the retaining lugs and remove.

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7 Remove printing unit from printer support as follows: on the ribbon side, bend left retaining lug away from the

metallic printing unit base plate and at the same timepress the printing unit on the board side so that the print-

ing unit base plate is shifted about 0.2mm over the re-taining lug.

in the same way, push the printing unit base plate overthe right retaining lug.

push the printing unit fully out of the printer support fromthe board side.

Installation

The installation of the built-in printer follows the revers disman-

tling order.

Make sure to have ready a new printing unit or new printer board,place EMC spring (a) and engage printing unit in the printer sup-port.

At tention

Carefully insert the printer in the HG/HR to preventthe pins in the connector on the power supplyboard from being bent! Never insert the printer atan angle!

a



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6.3.5 Replacing the Membrane Keypad

1 Remove the top housing, see Section6.2.2.

2 Strip off damaged membrane keypad from the cable side.3 Remove residual adhesive (if necessary, use pure ben-

zene).

Caution

Benzene is h ighly inflammable, use only smallquantities.

4 Insert the cable of the new membrane keypad.

5 Pull off the cover sheet of the adhesive layer.

6 Fit the membrane keypad into the recess of the top housing,first only at the left, front corner and then at the left edge.

Then roll into the recess to the right and press in place.

7 Install the top housing, see Section6.2.2.



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6.3.6 Replacing the Top Housing


2 Transfer the level cover (a), the model strip (b) and theprinter cover (c) from the damaged top housing to the newone.


a

c

b



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6.3.7 Replacing the Temperature Sensor


2 Cut cable fastener of sensor cable and pull off connector.

3 Lift temperature sensor out of the contact block housing(bend out the white retaining clips forward slightly) andreplace. Please note: the cable must lead in a straight linefrom the temperature sensor backward to the cable clip andthe EMC contact spring must press against the temperaturesensor.

4 Plug in connector and attach new cable fastener.


6 Connect instrument to the power supply.

7 Adjust temperature as described in the short-form operatinginstructions of the Moisture Analyzer. If the messageError5 appears, use LARS to clear temperature calibra-tion data and to adjust dryer unit again.



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6.3.8 Replacing the Contact Block Housing or the Contact Block or Rear Air Duct

Removal


2 Remove dryer unit support, see Section6.2.4.

3 Unscrew the two screws (a) of the rear air duct (Attention:hold nuts when removing the screws!) and remove the rearair duct.

4 Unscrew four screws (b) of the contact block housing andremove housing and contact block.

a

b



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HG and HR Moisture Analyzers Chapter Overview 6 RepairReplacing Unit Components

Installation

Note: If components carrying power supply voltage have beenremoved and reinstalled, check for correct ground connection:

Make sure the grounding screws are tightly fastened with atoothed washer in the correct place. Make sure there is a low-resistance connection between the

ground pin of the power supply plug and the grounded housingparts.

Make sure there is a direct connection from the ground pin ofthe power supply socket to the grounding screw on the hous-ing. Check with ohmmeter.

1 Fix contact block and contact block housing with the four

screws (b) to the dryer unit support. Make sure the EMCcontact spring (c) under the contact block is placed so, thatit presses upward against the temperature sensor.

2 Mount rear air duct with the screws and shaft nuts, but donot tighten the screws yet.

3 Install dryer unit support, see Section6.2.4, but do notmount the fan.

4 Push in the sample chamber completely.

5 Equalize horizontal play between the rear (inner) air ductand the front (outer) air duct and check by inserting a paperstrip (d) of thickness approx. 0.2 mm at the left and right ofthe fan under the inner air duct.

6 Screw in the two screws of the rear air duct (hold nuts).

7 Insert fan from above in its holder.


c

d



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6.3.9 Replacing the Fan

1 Remove top housing, see Section6.2.2.2 Remove CPU screening plate to access the fan connector.

3 Disconnect fan connector at the CPU board and removecable from the cable clips.

4 Pull fan up and out of the holder.

5 Install new fan. Ensure that the gasket exactly encircles thefan.




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6.3.10 Replacing the Pivot Bearings


2 Unscrew faulty pivot bearings (yellow closure levers (a) canbe taken over).

3 Screw left and right pivot bearing in lowest position.


5 Swing down dryer unit and check that it is horizontal andflush with the top housing. If need be, screw pivot bearings

in a higher position.6 Mount top housing, see Section6.2.2.

a



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G a d o s u e a y e s C ap e O e e 6 epaReplacing Unit Components

6.3.11 Replacing the Level

1 Remove top housing, see Section6.2.2.2 Replace faulty level (a) by a new one (use the 3 screws to

tension slightly on the spring washers, but do not level yet).

3 Dismantle sample chamber, see Section6.2.3.

4 Place service level under the dryer unit support in the bot-tom housing.

5 Adjust the three leveling feet until the air bubble of the ser-vice level is in the center.

6 Remove service level and adjust level on the dryer unit sup-port until its air bubble is in the center.



a



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y p pReplacing Unit Components

6.3.12 Replacing the CPU PCB

Removal

1 Switch on HG/HR and store or print out cell parameters,methods and user configuration with the aid of LARS (if nec-essary and possible).

2 Switch off instrument and disconnect from power supply!


4 Unscrew CPU screening plate.

5 Unscrew CPU board.

6 Carefully disconnect the 3 connectors of the fan, weighingcell and power supply board.

7 Carefully remove the program EPROM (a) from the old andinsert in new CPU board, casing notch points to the left.

Installation

Install in reverse order.

After replacing the CPU board, reload cell parameters, methodsand user configuration or key in from cell parameter strip (affixedto the CPU screening plate).

Important Note

A CPU PCB which was previously installed in another instrument

(e.g. for 'trial and error') will cause a wrong instrument designa-tion on print-outs or in LARS, and must be reset as follows:

Disconnect keyboard. Connect instrument to the power. Short-circuit keyboard connector pins 6 and 8 (counted from

left). Produktion is displayed. The PCB can be re-used.

a



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6.3.13 Replacing the Program EPROM

6.3.14 Replacing the rechargeable battery

Removal


2 Unscrew CPU screening plate.3 Carefully pull off old program EPROM.

Installation

The installation follows the reverse dismantling order.

When inserting the new program EPROM make sure the casingnotch points to the left.

Removal


2 Remove CPU board, see Section6.3.12.

3 Unsolder the rechargeable battery.

Installation

The installation follows the reverse dismantling order.

Solder in new battery as shown in the opposite figure.



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6.3.15 Replacing the Backlighting


2 Unscrew CPU screening plate.3 Unsolder connection leads of the backlighting from the sol-

dering lugs on the CPU board.

4 Unscrew screws of the CPU board to an extent which pre-vents the backlighting touching the dryer unit support whenremoved at the left.

5 Push in new backlighting so that the transparent surfacefaces upward and that it is fully held by the display holder onthe right.

6 Tighten screws of the CPU board.

7 Solder in connection leads of the backlighting.

8 Screw on CPU screening plate.




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Replacing Unit Components

6.3.16 Replacing the Power Supply PCB

Removal

1 Dismantle CPU PCB, see Section6.3.12.

2 Remove power supply screening plate, see Section 6.2.6.

3 Unscrew sample chamber drive (a) and place to one side.

4 Unscrew eye (b) of protective ground cable of the powerreceptacle.

5 Unplug the 2 connectors of the sample chamber drive andthe halogen radiator.

6 Unscrew power supply board and remove.

b

a



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Installation

NOTE: If components carrying power supply voltage have beenremoved and reinstalled, check for correct ground connection:

Make sure the grounding screws are tightly fastened with atoothed washer in the correct place.

Make sure there is a low-resistance connection between theground pin of the power supply plug and the grounded housingparts.


1 Screw in new power supply board (3 screws with toothedlock washer beneath screw head, 4th screw at left frontwithout toothed lock washer).

2 Screw on eye (b) of the protective ground cable of thepower receptacle (toothed lock washer beneath screwhead).

3 Connect sample chamber drive and halogen radiator.

4 Install power supply screening plate, see Section6.2.6.

5 Install CPU PCB, see Section 6.3.12.

b

a



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6.3.17 Replacing Heat Shield or Sample Chamber Front

1 Open sample chamber.

2 Remove sample pan support with sample pan as well as

sample pan holder and draft shield.3 Unscrew sample chamber front (a).

4 Lift up heat shield (b) slightly at front and then lift up and outtowards rear.

5 Replace heat shield or sample chamber front.

6 Screw on sample chamber front, mount draft shield, samplepan holder as well as sample pan support with sample pan.

a

b

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6.3.18 Replacing the Sample Chamber Drive

1 Remove CPU board, see Section6.3.12.

2 Remove power supply screening plate, see Section 6.2.6.3 Unplug connector of sample chamber drive and remove

sample chamber drive.

4 Screw on new sample chamber drive loosely (toothed lockwasher beneath screw head), then raise it so that the mesh-ing of the pinion in the gear rack is free from play and tightenscrews.

5 Plug in connector of the sample chamber drive.


7 Install CPU board, see Section6.3.12.

8 Insert built-in printer, carefully plug into connector on thepower supply board at the bottom and tighten screw.

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6.3.19 Replacing the Gear Rack

Note: If the teeth of the gear rack (a) on the right are damaged,

they can be exchanged with those on the left.1 Remove sample pan support with sample pan as well as

sample pan holder.



4 Dismantle front air duct, see Section6.2.5.

5 Disengage damaged gear rack and replace.

6 Install front air duct, see Section6.2.5.


8 Mount top housing, see Section6.2.2.9 Insert sample pan holder and sample pan support with sam-

ple pan.a

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6.3.20 Replacing the Guide Rails

1 Remove dryer unit support, see Section6.2.4.

2 Remove faulty guide rails.3 When screwing on the new guide rails, press the left guide

rail to the left, the right guide rail to the right.

4 Install dryer unit support, see Section6.2.4.

HG and HR Moisture Analyzers Chapter Overview 6 - RepairReplacingUnitComponents


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6.3.21 Replacing the Guide and Supporting Rollers


2 Dismantle sample chamber, see Section6.2.3.3 Replace guide and supporting rollers.

Note: Upper rollers with bearings, lower rollers without bearings.



Guide

Rollers

Supp

orting

Rollers



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6.3.22 Replacing the Sample Chamber Cable

1 Dismantle CPU board, see Section 6.3.12.

2 Dismantle power supply screening plate, see Section6.2.6.


4 Replace sample chamber cable. Please note: Carefully foldcable so that it touches nothing when the sample chamberis closed. Position cable support clip near the left rear level-ing screw so that it is not pinched between the cable boardand rear panel of the bottom housing when the samplechamber is closed.



7 Install CPU board, see Section6.3.12.



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6.3.23 Replacing the Bottom Housing

Removal

1 Dismantle CPU board, see Section 6.3.12.

2 Dismantle power supply screening plate, see Section6.2.6.

3 Dismantle power supply board, see Section 6.3.16.

4 Dismantle dryer unit support, see Section6.2.4.

5 Dismantle guide rails, see Section6.3.20.

6 Remove leveling screws.

Installation

NOTE: If components carrying power supply voltage have beenremoved and reinstalled, check for correct ground connection:

Make sure the grounding screws are tightly fastened with atoothed washer in the correct place.

Make sure there is a low-resistance connection between theground pin of the power supply plug and the grounded housingparts.


1 Mount the leveling screws in the new bottom housing.

2 Affix rating plate and information plate (the plates weredestroyed when the old bottom housing was removed, theymust therefore be reordered with details of the serial num-ber).

3 Screw on guide rails, see Section 6.3.20.

4 Install power supply board, see Section6.3.16.

5 Install dryer unit support, see Section6.2.4.

6 Plug in connector of the sample chamber drive and the con-nector of the radiator cable.

7 Install power supply screening plate, see Section6.2.6.8 Install CPU board, see Section6.3.12. Do not forget: plug in

the 3 connectors for the fan, weighing cell and power supplyboard.

HG and HR Moisture Analyzers Chapter Overview 6 - RepairWeighingcell


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Weighing cell

6.4 Weighing cell

6.4.1 Replacing the Weighing Cell

Removing1 Remove top housing, see Section6.2.2.

2 Remove sample chamber, see Section6.2.3.

3 Remove front air duct, see Section6.2.5.

4 Unplug the two connectors at the left and right on the coverof the weighing cell screening.

5 Lift off cover of the weighing cell screening.

6 Disengage the two small tension springs at the weighingcell cantilever arm using the tip of a paper clip (or a clamp-

type test probe) and remove cantilever arm.7 Place the sample chamber to the side and unscrew the

small Phillips screw of the weighing cell screening as wellas the two larger Phillips screws of the weighing cell.

8 Lift weighing cell together with the weighing cell screeningout of the sample chamber frame.



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Weighing cell

Installation

1 Place weighing cell inside the screening in the samplechamber frame.

2 Screw on weighing cell screening from below.3 Loosely fix the weighing cell with the two Phillips screws

and conical spring washers.

4 Push cantilever arm on the arm support and engage the twosmall tension springs using a paper clip.

5 Hold weighing cell at top by its chassis and move it so that the black bearing sleeve of the cantilever arm is exactly

in the middle of the sample chamber frame; at the same time ensure that a uniform air gap remains

between the weighing cell and the screening (to ensure

no heat bridges are formed). Tighten the two Phillips screws fixing the weighing cell.

6 Mount cover of the weighing cell screening and plug in thetwo connectors on the left and right.

7 Check the distance between the top edge of the cantileverarm and the weighing cell chassis. It must be 7.70.5 mm.If it is not, correct with the setscrew.

8 Push sample chamber onto rails and connect ribbon cable.

9 Mount adjustment weighing pan (from the service case).

10 Use LARS to load the new cell parameters. Affix cell param-

eter strip to the CPU screening plate using adhesive tape.7.7 0.5 mm



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Weighing cell

11 Test eccentricity and adjust if necessary (open samplechamber until the eccentricity screws in the cover of theweighing cell screening become visible. Then adjust theseand push in sample chamber until the front rollers are again

on the rails).12 Check that the bearing sleeve does not touch the sample

chamber front: Press adjustment weighing pan right downusing your finger. It must not stick and the display mustshow the same value after the pan is released.

13 After adjustment of the eccentricity, disconnect instrumentfrom the power supply again!

14 Remove adjustment weighing pan.

15 Install front air duct, see Section6.2.5.



Adjustments

After repairing and/or replacing the measuring cell, perform

Repeatability, Eccentricity, Sensitivity, Linearity.



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Weighing cell

6.4.2 Replacing Link

Removal

1 To protect the flexible bearing at the hanger, loosely inserttwo screws (a) M4x25 from the service kit (2-3 turns).

2 Loosen lower link screw (b).Note: To protect the flexible bearing, hold hanger.

3 Loosen upper link screw (c).Note: Be careful not to damage the bearings.

4 Unscrew lower link screw and take out the upper screwtogether with the link.

Installation

1 Place hanger shims (k) under hanger (adjust hanger

height).2 Insert the upper link screw together with the link from above

between lever and hanger and tighten loosely.Note: The round hole of the link is at the top. The burred side of the torsion protector lies on the link. Align the link exactly vertical.

3 Insert lower link screw, but do not tighten yet.Note: Burred side of torsion protector lies on link.

4 Tighten upper link screw.

5 Press hanger onto hanger shims, tighten lower link screw(adjust hanger height).Note: When tightening the lower link screw, press the armsupport (n) against the table surface so that it becomes par-allel to the base of the weighing cell.

6 Remove the two service screws on the hanger.

a

b

c

k

n

picture differs

slightly from actual



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Weighing cell

6.4.3 Replacing the Guides

Removal

1 Loosen the bottom screws (d) of the top and bottom guidesuntil hanger and guides move freely.

2 Slide hanger distance gauges between hanger and chassisand fix with two service screws (a).

3 Unscrew overload protection.

4 Remove top and bottom guides; the cell can be laid on theappropriate side for this.Note: Replace complete guide, i.e. with flexible bearing.

Installation

1 Fix hanger loosely to chassis with service screws (a)M4x25.

2 Place hanger shims (k) under hanger and slide hanger dis-tance gauges between hanger and chassis. Now press hanger onto hanger shims, tighten service screws (a).

3 Mount top guide (screw head to chassis). Center flexiblebearings with screw holes and screw tight.

4 Mount bottom guide (screw head facing outward). Centerflexible bearings with screw holes and screw tight.

5 Fasten overload protection.

6 Unscrew service screws (a) and remove hanger distancegauges.

d

d

a

pictures differ


a

k



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Weighing cell

6.4.4 Replacing the Lever

Removal

1 Remove link, see Section6.4.2.

2 Remove guides, see Section6.4.3.

3 Remove hanger distance gauges and hanger.

4 Unscrew counterweight (e) (small brass plate).

5 Remove lateral stop plate (f).

6 Unsolder contact strips (g) at lever board.

7 Unscrew bearing screws (h) on chassis side, remove pres-sure plates, torsion protectors and spring washers.

8 Lift lever out of chassis and lay down with coil upward.

Replacing bearings

1 Press upper side of lever against the hanger shims,unscrew the bearings from lever.Note: Always replace both bearings. Long hole on lever side.

2 Press upper side of lever against the hanger shims (lever ishorizontal!) so that the bearings are vertical to the lever.

Tighten screws (M4x16) with spring washers, torsion pro-tectors and pressure plates.

e

f

gh

90

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g g

Installation

Bearings checked or replaced.

1 Place lever in chassis and insert screws (h) (M4x16) withspring washers, torsion protectors and pressure plates in

bearings, but do not tighten yet.

2 Slide lever gauge (i) between lever and chassis.Note:Gauge must not lie against the locking nut of the levelweight.

3 Mount counterweight (e) on lever (tighten loosely) andensure that no pressure is exerted on bearings.

4 Press down lever on bearing side, tighten screws.Note: Center holes of bearings with the thread in the chassis. Center the detector vane of the lever with detector.

5 Mount lateral stop (f) (M3x6).Note:Center peg at lever with engagement hole. Check by lateralpressure on the lever.

6 Tighten fastener screw at counterweight.

7 Solder on contact strips at lever board.Note:

The strips must be parallel, they must not touch.

8 Assemble instrument.

e

f

h

i

picture differsslightly from actual

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g g

6.4.5 Replacing the Detector

Removal

1 Disconnect cable from detector board.

2 Unsolder both temperature sensor wires (n).

3 Unscrew detector housing with detector board.

Installation

Requirements: The reference resistor (m) of the defectivedetector must be transferred to the replacement detector or anew resistor ordered.

1 Plug connection cable to detector board.

2 Screw detector board to magnet system.Note:

The detector housing is parallel to the underside of the leverand is centered.

3 Solder on the two temperature sensor wires (n) (polarity notimportant).

Adjustments of detector board see Section6.5.2.

mn

picture differsslightly from actual

HG and HR Moisture Analyzers Chapter Overview 6 - RepairWeighing Cell Adjustments


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g g j

6.5 Weighing Cel l Adjustments

General information

Before every adjustment, check that the weighing cell is me-

chanically in order. Test weights and tolerances see Chapter 9.

Replacing the Weighing Cellsee Section6.4.1.

6.5.1 Hysteres is

Press weighing pan down firmly until full load, release.

Tare.

Using a brush, raise weighing pan slightly and press downslightly.

The balance display must return to zero in all cases. If this is notthe case, check the weighing cell for mechanical faults or dirt inthe magnet system.



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6.5.2 Detector

Notes

If the detector board is out of adjustment or has been replaced,it must be realigned. It is necessary to expose the weighingcell for this.

The vertical stop setting is the reference for the lever height(horizontal position). Starting position 14.7 0.1 mm(see illustration).

Preparation

Ribbon cable from the detector board connected,coil cable disconnected.

Plug service cable to detector board and attach the voltmeter(DC range).

Switch on balance.

Determining voltage value

Note down 1st voltage value U1 as soon as the balance isswitched on. The lever is at the bottom of the vertical stop.

Press down the hanger until the lever is at the top of thevertical stop. Note down 2nd voltage value U2.

If the two voltage values U1 and U2 are different, (e.g.+2 V/-1.6 V), move the detector housing downward or upwarduntil U1 and U2 are the same.

Remark: Voltage range 1.5 V...3 VAsymmetry max. 0.1 Vpicture differs


14.7 0.1 mm top of screw to

bottom of chassis



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6.5.3 Eccentr ic ity

The principle of the eccentricity error correction involves settingthe parallelism of the parallelogram formed by the upper andlower guides by adjusting the rear fixing points of the upper guide.

Checking the basic setting

The following applies as the basic setting or for a visual check onthe eccentricity and setscrew.

The bottom of the slot in the setscrew is flush with the upperedge of the eccentricity screw.

The distance at the rear of the chassis, where the eccentricityspring is press fitted, is 4.5 0.1 mm (see illustration).

The setscrew must not turn. If so, tighten locking nut.

Preparation

Install measuring cell, connect all cables.

Close instrument, mount adjustment pan (service case).

Switch on instrument.

4.5

0.1

mm



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Correcting the eccentricity error

1 Place test weight in the middle of the weighing pan and tare.

2 Move weight to left, rear, right and front to the edge of theweighing pan and note down/print out display values with

sign that differ from zero (see example).3 Compare display values with eccentricity tolerances in

Section9.1.

4 Correct deviations by turning the eccentricity screws in thedirection of the arrow, as shown in the illustrations.

Notes

Combine correction of longitudinal and transverse errors.

Turn the eccentricity screws using a 6 mm socket wrench.

-10

-2+3

+7

0

Eckenlast

Example



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6.5.4 Level Zero

If the measuring cell has been completely dismantled, the level-ing weight must be adjusted using the leveling screw.

1 Level instrument.

2 Tare instrument with empty weighing pan.

3 Lift balance at front and insert 0.5 mm shim (metal ruler)under the front feet.

4 Correct by turning screw (a). Tolerance values according totolerance table, Section9.2. If the display value is negative (-), turn screw (a) in. If the display value is positive (+), turn screw (a) out.

Example:Level indicator adjusting the leveling screw

5 Remove shims.

6 Tare again with empty weighing pan.

Repeat this procedure (Steps 4 - 6) until the two values (with /

without shim) lie within tolerance.

a

Display -

HG and HR Moisture Analyzers Chapter Overview 6 - RepairTests


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6.6 Tests

6.6.1 Thermal Overload

Purpose

To test the Temperature Limit Switch for correct functioning.

Procedure

1 Open dryer unit and clean protective glass and reflector inthe heating unit to avoid heat absorption.

2 Bend the white holder (1) slightly forward and remove thetemperature sensor.

3 Turn temperature sensor around and push it to the back (2)so it does not become trapped when the dryer unit is closed.

4 Use new aluminum sample pan for max. heat reflection.

5 Close the dryer unit.

6 In LARS, open the Text menu and click Thermal overload.Perform Test as described in the LARS Help menu (F1).

WARNING

Al low heating module to cool down!

Reset Temperature Limit Switch (3).

Heater Test

1

2

3

HG and HR Moisture Analyzers Chapter Overview 7 - LARS


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7 LARS

List of Contents

7.1 LARS - LabTec Repair and Service Software . . . . 7-2

7.2 LARS Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . 7-37.2.1 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-37.2.2 Software-Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-37.2.3 Download from Internet. . . . . . . . . . . . . . . . . . . . . . . 7-47.2.4 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-67.2.5 TDNR File Update. . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

7.3 Using LARS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-97.3.1 Connect balance to computer . . . . . . . . . . . . . . . . . . 7-97.3.2 Start / Exit LARS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-97.3.3 Working with LARS . . . . . . . . . . . . . . . . . . . . . . . . . 7-107.3.4 Load type data (TDNR) . . . . . . . . . . . . . . . . . . . . . . 7-11

7.4 Data Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-127.4.1 Terminology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-127.4.2 Consequences. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12

HG and HR Moisture Analyzers Chapter Overview 7 - LARSLARS - LabTec Repair and Service Software


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7.1 LARS - LabTec Repair and Service Software

LARS is a Service SW to verify, repairand diagnose PROD-UCTs. It is available in the four languages German, English,

French and Spanish.

to verify means to remeasure the technical data and to comparethese measured data with the nominal values listed in the toler-ance table.

to repairmeans to replace parts and configure the balance as torestore it to the original working order, i.e. a state in which it canperform the specified performance.

to diagnose means to perform a test to conclude from symp-toms/results whether a suspicious behavior is confirmed or not.

LARSLock

Hardlock (usage protection) required to run the service software.Part no. see Chapter Service Aids.

LARS SW availabili ty

Find the LARS Service Software on the Service Expert DVD.However, to make sure to always have the latest version, down-

load it from the LabTec Homepage http://www.extranet.mt.com.

Operating instructions

The LARS Operating Instructions are part of the software, i.e. anintegrated help file. Press the F1 key or select the Help Menu.

Operating system requirements

LARS


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7.2 LARS Instal lation

7.2.1 Requirements

Mettler-Toledo recommends to work with the latest version of

LARS. See Section7.2.3 as how to install it.

USB hardlock LARSLock , part number11107505.

If you are not authorized to install SW, ask your IT support.

7.2.2 Software-Check

ATTENTION

Before you install LARS from the ServiceExpert disc,please check on http://www.extranet.mt.comwhetheryou have the latest version of the LARS software.

1 Double-click .2 Click HelpA and then click Info.

TheAbout LARS window opens. The currently installed versionB is displayed.

A

B

HG and HR Moisture Analyzers Chapter Overview 7 - LARSLARS Installation
http://www.extranet.mt.com/http://www.extranet.mt.com/


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7.2.3 Download from Internet

1 Click on the link http://www.extranet.mt.com(LabTecMarket Support).

2 Click LabTec Market Support.

3 Enter user name and password. If password is notavailable, ask your Service Manager.

4 Click Software.

5 Click LARS Software.The most recent version of the LARS software is shown atthe top of the list.

6 Click on the software version you wish to download.

2

4

5

6

http://www.extranet.mt.com/http://www.extranet.mt.com/


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7 Click Installation.

8 Click Run.

9 The storage location is displayed. Accept (recommended)or select one suiting your system organization.

10 Click Unzip.The files are saved in the selected storage location.

11 Click OK.

7

8

10

11

9



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7.2.4 Instal lat ion

RunSetup.exe. The installation procedure starts.

Follow the instructions of the installation program.



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7.2.5 TDNR File Update

Note: Frequently check the content version.

1 Exit LARS.2 Click on the link http://www.extranet.mt.com(LabTec

Market Support).

3 Click LabTec Market Support.

4 Enter user name and password. If password is notavailable, ask your Service Manager.

5 Click Software.

6 Click LARS TDNR File.

7 Click the LARS TDNR type data link.

3

5

6

Date post:	10-Feb-2018
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