DS20930 Model: COLOR TELEVISION AS FILE NO. DS209 30 , G8TDM, PRODUCT CODE 1 1 13 67 88 0 REFERENCE No. SM780088-07 Notice CORRECTION SERVICE FLASH PRODUCTION CHANGE ADD INFORMA TION Please add this notice to the Service Manual listed below. REVISION 07 Category : U. S. A. / CANAD A Destination: April / 15 / 20 04 Date: 20930-07 Effective from : Chassis No. SM780088-06 REF : No. NOTE: Match the Chassis No. on the unit’s back cover with the Chassis No. in the Service Manual. If the Service Manual Chassis No. does not matc h the unit’ s, additiona l Service Literature is required. This chassis is similar to Chassis No. 20930-06. Only the difference Service Information is given in this manual. For detailed Service Information, refer to the Original Service Manual and Notices for Chassi s No. 209 30-06 used in M odel DS209 30 (SM780 088 -06). 1 . IN THE CHASSIS ELECTRICAL P ARTS LIST The reason for change. A : Misprint B : Quality Reliability C : Standardization D : Design E : Add as a possible sub F : Schematic location change G : Purchasing Request Page & Section Schematic Location Part No. Description Q’ty Interchange- ability Reason Old 40 1 0 68 1600 OXIDE-MT 4.7 J A 2W 1 NO R4 97 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - D New 40 1 0 68 6209 OXIDE-MT 5.6 J A 2W 1 NO Old 610 3 10 6847 ASSY, PWB, MAIN 1 NO A10 0 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - D New 61 0 3 12 5824 ASSY, PWB, MAIN 1 NO Old 610 3 10 6854 ASSY, PWB, SOCKET 1 YES A70 0 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - D New 61 0 3 12 5831 ASSY, PWB, SOCKET 1 YES Old 414 01 2 3 209 CRT A51QDX992X0 03 1 NO Q90 1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - D New 414 0 12 3100 CRT A51QDK190X022 1 NO Page 19, Chassis Electrical Parts List Page 20 Chassis Electrical Parts List
Transcript
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 1/56
DS20930Model:
COLOR TELEVISION
ASFILE NO.
NoticeCORRECTION
SERVICE FLASH
PRODUCTION CHANGE
ADD INFORMATION
Please add this notice to the Service Manual listed below. REVISION 07
Category :
U.S.A. / CANADADestination :
April / 15 / 2004Date :
20930-07Effective from : Chassis No.
SM780088-06REF : No.
NOTE: Match the Chassis No. on the unit’s back cover with the Chassis No. in the ServiceManual. If the Service Manual Chassis No. does not match the unit’s, additional ServiceLiterature is required. This chassis is similar to Chassis No. 20930-06. Only thedifference Service Information is given in this manual. For detailed Service Information,
refer to the Original Service Manual and Notices for Chassis No. 20930-06 used in M odelDS20930 (SM780088-06).
1. IN THE CHASSIS ELECTRICAL PARTS LISTThe reason for change.
A : Misprint B : Quality Reliability C : StandardizationD : Design E : Add as a possible sub F : Schematic location change
G : Purchasing Request
Page &Section
SchematicLocation
Part No. Description Q’ty Interchange-ability Reason
Please add this notice to the Service Manual listed below. REVISION 06
Category :
DS20930Model:
U.S.A. / CANADADestination :
APRIL / 15 / 2004Date :
20930-06Effective from : Chassis No.
NOTE: Match the Chassis No. on the unit’s back cover with the Chassis No. in the Service Manual.If the Service Manual Chassis No. does not match the unit’s, additional Service Literatureis required. This chassis is similar to Chassis No. 20930-00, however , all Service Information
is given in this Notice for Chassis No. 20930-06 used in Model DS20930.
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 3/56
SAFETY PRECAUTIONSWARN ING: The chassis of this receiver has a floating
ground with the potential of one half the AC line voltage inrespect to earth ground. Service should not be attempted byanyone not familiar with the precautions necessary whenworking on this type of equipment.The following precautions must be observed:1. An isolation transformer must be connected in the power
line between the receiver and the AC line before any ser-vice is performed on the receiver.
2. Comply with all caution and safety-related notes provid-ed on the side of the cabinet, inside the cabinet, on thechassis, and the picture tube.
3. When replacing a chassis in the cabinet, always be certainthat all the protective devices are installed properly, suchas control knobs, adjustment covers, shields and barriers.
DO NOT OPERATE THIS TELEVISION RECEIVERWITHOUT THE PROTECTIVE SHIELD IN POSITION ANDPROPERLY SECURED.
4. Before replacing the back cover of the set, thoroughlyinspect the inside of the cabinet to see that no stray partsor tools have been left inside.Before returning any television to the customer, theservice technician must perform the following safetychecks to be sure that the unit is completely safe tooperate without danger of electrical shock.
ANTENNA COLD CHECK Remove AC plug from the 120 VAC outlet and place a
jumper across the two blades. Connect one lead of an ohm-meter to the jumpered AC plug, and touch the other lead toeach exposed antenna terminal (UHF and VHF antenna ter-minals). The resistance must measure between 1M ohm and5.2M ohm. Any resistance value below or above this rangeindicates an abnormality which requires corrective action.
LEAKAGE CURRENT CHECK Plug the AC line cord directly into a 120 VAC outlet. (Do notuse an isolation transformer for this check.) Use an AC volt-meter, that has 5000 ohms per volt or more sensitivity.Connect a 1500 ohm 10 watt resistor, paralleled by a 0.15 µF150 VAC capacitor, between a known good earth ground
X-RADIATION PRECAUTION The primary source of X-RADIATION in solid-state receivers isthe picture tube. The picture tube is specially constructed tolimit X-Ray emission. For continued X-RADIATION protection,the replacement tube must be the same type as the original
(including the suffix letter in the part numbers). Excessive highvoltage may produce potentially hazardous X-RADIATION. Toavoid such hazards, the high voltage must be maintained withinspecific limits. Refer to the X-RADIATION WARNING NOTE onthe CHASSIS SCHEMATIC in this service manual for specifichigh voltage limits. If the high voltage exceeds specified limits,check the components specified on the chassis schematicdiagram and take the necessary corrective action. Carefullyfollow the instructions for the +B Voltage Check and the High
Voltage Check to maintain the high voltage within the specifiedlimits.
HIGH VOLTAGE HOLD-DOWN TEST To prevent X-RADIATION from the picture tube due toexcessive high voltage, a HOLD-DOWN circuit is provided inthe high voltage circuit. Every time the receiver is serviced,
SAFETY INSTRUCTIONS
0.15 µF 150V AC
1500 ohm10 watt
Good earth groundsuch as a water pipe,conduit, etc.
AC OUTLET
TELEVISIONRECEIVER
READING SHOULD NOT EXCEED 750 mV.AC VOLTMETER
(5000 ohms per volt or more sensitivity)
To be touched to all of exposed metal parts.
Voltmeter Hook-up for Leakage Current Check.
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 4/56
GENERAL This set has an on-screen Service Menu system included in the CPU that allows remote operation for most of the service adjustments. To enter the Service Menu, first disconnect the AC power cord. Then while pressing the MENU key on the front control panel , recon-nect the AC power cord. The adjustments can now be made with the remote control or front control panel keys.
ON-SCREEN SERVICE MENU SYSTEM1. Enter the Service Menu:
• While pressing the MENU key on the front control panel , reconnect theAC power cord. The Service Menu Display will now appear. See Figure 1.
2. Service Adjustments:• Press the or key to select the desired service menu item you
want to adjust. (See page 5 for On-screen Service Menu.)•
Use the +or – key or number keys to adjust the data. The +or – keys will increase or decrease the data sequentially. The number keys (0 ~7) toggle only their respective bits between1 and 0 and are used to change the Sub-Address. For example tochange bit 5 press the number 5 key. See below.
3. Exit from the Service Menu:• Press the MENU key to turn off the Service Menu display.
SERVICE ADJ USTMENTS
IC802 (EEPROM) REPLACEMENTWhen IC802 (EEPROM) is replaced, IC801 (CPU) will automatically write the initial reference data into IC802 for basic TV operation.However, the bus data should be checked and some bus data should be set up before attempting the service adjustments.(See pages 5 – 7, Table 1, for detailed bus data information.)
INITIAL BUS DATA SETUPNote:When IC802 (EEPROM) is replaced, change the following initial reference data for proper TV operation before
attempting service adjustments.
1. Disconnect the AC power cord (AC 120V line).2. While pressing the MENU key, reconnect the AC power cord. The Service Menu display will now appear.3. Select NO. 3B SCN (Sub Contrast) with or key. Adjust the data with +or – key for 10.4. Select NO. 3C SCO (Sub Color) with or key. Adjust the data with +or – key for 15.5. Select NO. 3D STI (Sub Tint) with or key. Adjust the data with +or – key for 05.6. Select NO. 41 HP (H Phase) with or key. Adjust the data with +or – key for 0F.7. Select NO. 42 VS (V Size) with or key. Adjust the data with +or – key for 5A.8. Select NO. 43 VSP7VKI6VDC (V Sync Sep / V Kill / V DC) with or key. Adjust the data with number keys for 18.9. Select NO. 44 HBL5VLN (H Blk L / V Lin ) with or key. Adjust the data with number keys for 35.
10. Select NO. 45 HBR5VST (H Blk R / V Lin Shift) with or key. Adjust the data with number keys for 43.
3C SCO15 00010101
Figure 1. Service Menu Display
ITEM NO.
TITLE
BINARY DATA(8 bit)HEX DATA
(b7) (b6) (b5) (b4) (b3) (b2) (b1) (b0)
0 1 0 1 0 1 1 0 BINARY DATA(8 bit)
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 5/56
INITIAL BUS DATA SETUP (Cont.)
18. Select NO. 67 VMD6VMG3SSN (VM Delay / VM Gain / Sync Sep Sens) with or key. Adjust the data with numberkeys for 22.
19. Select NO. 69 EWD (E/W DC) with or key. Adjust the data with +or – key for 2A.20. Select NO. 6A EWA (E/W Amp) with or key. Adjust the data with +or – key for 16.21. Select NO. 6B EWT (E/W Tilt) with or key. Adjust the data with +or – key for 29.22. Select NO. 6C ECB4ECT (E/W Corner Btm / E/W Corner Top) with or key. Adjust the data with number keys for 54.23. Select NO. 83 OPT (Aspect Ratio / Surround) with or key. Adjust the data with +or – key for A0.24. Select NO. 84 OP2 (Component / V Guide) with or key. Adjust the data with +or – key for 20.25. Select NO. 86 CBR (RF C Bypass) with or key. Adjust the data with +or – key for 00.
26. Select NO. 8C CBT (RF C BPF Test) with or key. Adjust the data with +or – key for 08.27. Select NO. 8D HR (H Display Position) with or key. Adjust the data with +or – key for 24.28. Select NO. 8E SBO (Sub Bright Offset) with or key. Adjust the data with +or – key for 05.29. Select NO. 98 DRY (YUV R-Y Difference) with or key. Adjust the data with +or – key for 0B.30. Select NO. 99 DBY (YUV B-Y Difference) with or key. Adjust the data with +or – key for 10.31. Select NO. A1 EEA (16:9 E/W Amp Difference) with or key. Adjust the data with +or – key for F6.32. Select NO. A7 EVB (16:9 V Blk Sw) with or key. Adjust the data with +or – key for 60.33. Press the MENU key to turn off the Service Menu display.
SERVICE ADJ USTMENTS (Cont.)
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 6/56
Table 1. ON-SCREEN SERVICE MENUWhen IC802 (EEPROM) is replaced, check the bus data to confirm they are the same as below. The shaded menu should bechecked and be set up or readjusted according to the procedures described in the following pages. Initial Setup Data markedwith an * should be changed from Initial Reference Data. (See pages 3 and 4 for Initial Bus Data Setup.)
No. TITLE IN IT IA L REFER EN CE IN IT IA L SET UP IN IT IA L SET UP FUNCTIOND A TA HEX D ATA HEX D A TA BINA R Y
3B SCN 0F 10* 00010000 Sub Contrast (4~ 0)
3C SCO 1F 15* 00010101 Sub Color (5~ 0)
3D STI 07 05* 00000101 Sub Tint (4~ 0)
3E SB 18 18 00011000 Sub Bright (5~ 0)
3F SSH 00 00 00000000 Sub Sharpness (4~ 0)
40 A FC6HFR 90 90 10010000 A FC(6) Horizontal Frequency (5~ 0)
41 HP 12 0F* 00001111 Horizontal Phase (4~ 0)
42 VS 60 5A * 01011010 Vertical Size
43 VSP7VKI6VD C 07 18* 00011000 V Sync Sep (7) V K ill (6) V D C (5~ 0)44 HBL5VLN 06 35* 00110101 H Blanking L (6~ 5) V. Linearity (4~ 0)
45 HBR 5VST 20 43* 01000011 H Blanking R (6~ 5 V Shift (3~ 0)
46 VSC 0A 0E* 00001110 Vertical S Correction (4~ 0)
47 VTS6VC3CDM 38 28* 00101000 V Test (7~ 6) V Compression (5~ 3)Count D own M ode (0)
48 FBS4G RY 2CR S 10 10 00010000 VNS (7) V Blk (6~ 5) FBP Blk (4) G ray M ode (2) CR S (1~ 0)
49 R B 00 00 00000000 R ed Bias (7~ 0)
4A G B 00 00 00000000 G reen Bias (7~ 0)
4B BB 00 00 00000000 Blue Bias (7~ 0)
4C RD 40 40 01000000 R ed D rive (6~ 0)
4D G D 08 08 00001000 G reen D rive (3~ 0)
4E BD 40 40 01000000 Blue D rive (6~ 0)
4F SBI 40 30* 00110000 Sub Bias (6~ 0)
50 " " " " Not U sed
51 " " " " Not U sed
52 O SD 03 03 00000011 O n Screen D isplay Contrast (1~ 0)
53 A BL5M SD 4RTS3BAT 04 0C* 00001100 A BL D efeat (5) M ID Stop (4) RG B Temp (3) A BL Thresh (2~ 0)
54 CR G 12 12 00010010 Coring G ain (7~ 6)55 STR 4FLS 41 21* 00100001 S Trap Test (6~ 4) Y /C Filter M ode (2~ 0)
56 Y A P6PR E4O VR 2WP 00 00 00000000 Y A PF (6) Pre Shoot (5~ 4) O ver Shoot (3~ 2) White Peak (1~ 0)
57 YG M 6D CR 4BSS2BSG 04 04 00000100 Y G am (7~ 6) D C R es (5~ 4) B Strk Start (3~ 2) B Strk G ain (1~ 0)
58 CBT3 60 60 01100000 Cb Trap (7~ 3)
59 " " " " Not U sed
5A " " " " Not U sed
5B A F7CBP5 20 A 0* 10100000 A uto Flesh (7) C Bypass (5)
5C CK O 07 03* 00000011 Color K iller (2~ 0)
5D R Y A 08 08 00001000 R -Y /B-Y A ngle (3~ 0)
5E CBO 4CR O 98 98 10011000 Cb D C O ffset (7~ 4) Cr D C O ffset (3~ 0)
5F G Y A 3 00 00 00000000 G -Y Angle (3)
60 " " " " Not U sed
61 FM M 5 00 00 00000000 FM M ute (5)
62 IA S7STS6R A D 60 60 01100000 IF A G C (7) S Trap SW (6) R F A G C (5~ 0)
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 7/56
Table 1. ON-SCREEN SERVICE MENU (Continued)
SERVICE ADJ USTMENTS (Cont.)
No. TITLE IN IT IA L REFER EN CE IN IT IA L SET UP IN IT IA L SET UP FUNCTIOND A TA HEX D A TA HEX D A TA BINA R Y
6C ECB4ECT 33 54* 01010100 E/W Corner Bottom(7~ 4) E/W Corner Top (3~ 0)6D EWS7ETS3HSC 84 84 10000100 E/W Correction Sw(7) E/W Test (5~ 3) H Size Comp (2~ 0)
6E " " " " Not U sed
6F " " " " Not U sed
80 ATT 07 07 00000111 A ttenuation -M TS Input Level (3~ 0)
81 WD B 20 20 00100000 Wide Band - Low Separation (5~ 0)
PROGRAM CODES The microprossesor used in this model is a multi-purposetype and is used in several different models. To ensureproper operation and the correct features for your particu-
lar model, the program codes must be correct.Note 1. Option Data 1 (NO. 83 OPT) should be hexadecimalA0 (10100000 binary). See page 4 INITIAL DATA SETUP,step 23, for set up procedure. If this program code is wrongthe TV will not operate properly.
Note 2. Option Data 2 (NO. 84 OP2) should be hexadecimal20 (00100000 binary). See page 4 INITIAL DATA SETUP,step 24, for set up procedure. If this program code is wrongthe TV will not operate properly.
BIT FUNCTIONDATA
0 1
0 ~1 TV / HOTEL / MON N/A N/A
2 VIDEO MODE NONE YES
3 ~4 CLOCK N/A N/A
5 ASPECT RATIO NONE YES
6 NOT USED — —
7 SURROUND NONE YES
Note 1.Red/Blue Drive Adjustments in Service Menu NO. A8 DRV:Adjust Red and Blue Drive Levels alternately with 1, 3, 7,and 9 keys on the remote control. See Figure 2. The DriveLevel adjustment data will be written in the Service MenuNo. 4C RD and 4E BD automatically.
1 2 3
4 5 6
7 98
RB(–) RB(+)
BB(–) BB(+)
(N/A)
GB(–) (N/A) GB(+)
(N/A)
FOR RED BIAS ADJ USTMENT
FOR BLUE BIAS ADJ USTMENT
FOR GREEN BIAS ADJ USTMENT
Figure 2.
Figure 3.
1 2 3
4 5 6
7 98
RD(–) RD(+)
BD(–) BD(+)
(N/A)
(N/A) (N/A) (N/A)
(N/A)
FOR RED DRIVE ADJ USTMENT
FOR BLUE DRIVE ADJ USTMENT
Note 2.Red/ Green/Blue Bias Adjustments in Service MenuA9 (No Vertical Sweep):Adjust each Bias Level with 1, 3, 4, 6, 7, or 9 key on theremote control. See Figure 3. The Bias Level adjustmentdata will be written in the Service Menu No. 49 RB,No. 4A GB, and No. 4B BB automatically.
DRIVE AND BIAS ADJ USTMENTS
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 9/56
ANTENNA CONNECTIONS This receiver is designed for UHF/VHF reception. A 75 ohm
terminal is provided for UHF and VHF receptions. Whenconnecting a CATV antenna system, connect the 75 ohmcoaxial cable directly to the 75 ohm terminal. For 300 ohmVHF antenna, use an adapter (not included with the TV set).
CIRCUIT PROTECTIONFuse F601 (4A) is included in the AC line. This fuse must bereplaced with the proper fuse (see Parts List).
+B VOLTAGE CHECK Connect Voltmeter +lead to TJ 1 130V and – lead to ground(TE7). Connect receiver to AC 120V line. Tune receiver to an
active channel. Reset the picture controls to the FACTORYPRESET levels (press remote control RESET key twice).Voltage must measure between +128.0V and +132.0V. If thevoltage is out of this range, the power circuit must bechecked. No +B adjustment is provided on this chassis.
HORIZONTAL CENTERING ADJ USTMENT1. Tune receiver to an active channel.2. Check that picture is in the horizontal center of TV screen.
If picture is not centered horizontally, perform steps 3 ~6.
3. Turn off the receiver and disconnect the AC power cord.4. While pressing the MENU key, reconnect the AC powercord. The Service Menu display will now appear.
5. Select NO. 41 HP (Horizontal Phase) with or key.6. Adjust the data with +or – key for horizontal center. To
turn off the Service Menu display, press the MENU key.
VERTICAL SIZE ADJ USTMENT1. Tune receiver to an active channel.2. Check the vertical size of the picture. If the vertical size is
too large or small, perform steps 3 ~6.3. Turn off the receiver and disconnect the AC power cord.4. While pressing the MENU key, reconnect the AC power
cord. The Service Menu display will now appear.5. Select NO. 42 VS (Vertical Size) with or key.6. Adjust the data with +or – key for full scan. To turn off
the Service Menu display, press the MENU key.
VERTICAL CENTERING ADJ USTMENT1. Tune receiver to an active channel.
2. Check that picture is in the center of TV screen. If picturecenter is too low, change resistor R513 from 1K ohm 1W to470 ohm 1W. If picture center is too high, add resistor R512(1K ohm, 1/2W).
RF AGC ADJ USTMENT1. Tune receiver to strongest VHF station in your area.2. Set contrast and brightness controls for maximum.3. Turn off the receiver and disconnect the AC power cord
(120V AC line).4. While pressing the MENU key, reconnect the AC power
cord. The Service Menu display will now appear.5. Select NO. 62 RAD (RF AGC Delay) with or key.6. Adjust the data with + or – key in the direction which
causes snow to appear; then in the opposite directionuntil the snow just disappears.
7.To turn off the Service Menu display, press the MENU key.
VIDEO LEVEL1. Connect color-bar generator to antenna terminals.2. Turn off the receiver and disconnect the AC power cord
(AC 120V line).3. Connect oscilloscope to TP16 (Q132 emitter) and ground.4. While pressing the Menu key, reconnect the AC power
cord. The Service Menu will now appear.5. Select NO. 63 VL (Video Level) with the or key.6. Adjust with the number keys (4~2) for an oscilloscope
reading of 1.0 ±0.1 VP-P at TP16. Press the MENU key toturn off the Service Menu display.
CAUTIONFOR CONTINUED PROTECTION AGAINSTA RISK OF FIRE, REPLACE ONLY WITHTHE SAME TYPE 4A, 125V FUSE.
ATTENTION : POUR MAINTENIR LA PRO-TECTION CONTRE LES RISQUESD’ INCENDIE UTILISER UN FUSIBLE DERECHANGE DE MEME TYPE 4A, 125V.
4A 125V
1.0 ±0.1 VP-P
Figure 4.
SERVICE ADJ USTMENTS (Continued)
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 10/56
GRAYSCALE ADJ USTMENT1. Set the picture controls to the Auto levels or Reset (use
MENU key and or key or RESET key).2. Turn off the receiver and disconnect the AC power cord(120V AC line).
3. While pressing the MENU key, reconnect the AC powercord. The Service Menu display will now appear.
4. Select NO. 49 RB (Red Bias), NO. 4A GB (Green Bias),and NO. 4B BB (Blue Bias) with or key and set eachdata to 0 with +or – key.
5. Select NO. 4C RD (Red Drive) and NO. 4E BD (Blue Drive)with or key and set each data to 40 with +or – key.
6. Set NO. 4D GD (Green Drive Reduction) data to 08, NO. 3ESB (Sub-Brightness) data to 18, NO. 3C SCO (Sub Color)data to 15, NO. 3D STI (Sub Tint) to 05, and NO. 3F SSH(Sub Sharpness) data to 00 with or , and +or – keys.
7. Turn Screen Control (T402) to minimum (fully counter-clockwise).
8. Select the Service Menu NO. A9 (No Vertical Sweep)with or key.
9. Advance Screen Control (T402) clockwise to obtain justvisible one color line. If line does not appear, place this
control to maximum (fully clockwise).10. Raise each Bias Level with 3, 6, and 9 keys to obtain just
visible white line. See Figure 5.
11. Select the Service Menu NO. A8 DRV (Drive Adjustments)with or key.
12. Adjust Red and Blue Drive Levels alternately with 1, 3,7, or 9 key to produce normal black and white picture inhighlight areas. See Figure 6.
FOCUS ADJ USTMENTAdjust focus control (T402) for well defined scanning lines.
HIGH VOLTAGE CHECK Note: +B (+130V) Voltage Check and Grayscale Adjustment
must be completed before attempting high voltageCheck.
1. Connect high voltage voltmeter – lead to ground, andconnect +lead to anode of picture tube.
2. Tune receiver to an active channel and confirm TV isoperating properly.
3. Eliminate the beam current by adjusting the contrastand brightness controls to minimum.
4. Confirm high voltage is within 28.0 KV and 31.1 KV. If reading is not within range, check horizontal circuit.
No high voltage adjustment is provided on this chassis.
BRIGHTNESS LEVEL ADJ USTMENT
Note: Grayscale, RF AGC, Video Level, and High Voltage Checkmust be adjusted before attempting Brightness LevelAdjustment.
1. Connect a color-bar generator to the antenna terminals.2. Switch the generator to the crosshatch pattern.3. Reset the picture controls to the Auto levels.4. Connect voltmeter (high impedance) +lead to terminal
TP51 and – lead to terminal TP50 on main board. Setvoltmeter for 1.5V ~3V range.
5. Turn off the receiver and disconnect the AC power cord.6. While pressing the MENU key, reconnect the AC power
cord. The Service Menu display will now appear.
7. Select NO. 3E SB (Sub Brightness) with or key.8. Adjust the data with +or – key for 680mVDC.9. Press the MENU key to turn off the Service Menu display.
10. Check brightness level on every active channel, readjust(repeat steps 5 ~9), if necessary.
Note: Do not set to excessive brightness level, otherwisethe contrast level will be suppressed.
1 2 3
4 5 6
7 98
RB(–) RB(+)
BB(–) BB(+)
(N/A)
GB(–) (N/A) GB(+)
(N/A)
FOR RED BIAS ADJ USTMENT
FOR BLUE BIAS ADJ USTMENT
FOR GREEN BIAS ADJ USTMENT
Figure 5. Remote Control Number keys’ functions inService Menu NO. A9 (No Vertical Sweep)
1 2 3
4 5 6
7 98
RD(–) RD(+)
BD(–) BD(+)
(N/A)
(N/A) (N/A) (N/A)
(N/A)
Figure 6. Remote Control Number keys’ functions inS i M NO A8DRV
FOR RED DRIVE ADJ USTMENT
FOR BLUE DRIVE ADJ USTMENT
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 11/56
SERVICE ADJ USTMENTS (Continued)
HIGH VOLTAGE HOLD-DOWN TESTEvery time the receiver is serviced, the HIGH VOLTAGEHOLD-DOWN circuit must be tested for proper operation byfollowing these steps:1. Connect receiver to 120V AC line. Tune receiver to
active channel. Reset the picture controls to the Autolevels.
2. Check that the voltage measured between TP7 and TE7(ground side) is within 16.5 VDC to 21 VDC. If the volt-age is out of this range, the Hold-Down Circuit must bechecked.
3. Connect a DC Voltage supply to TP7 and TE7 through a100 ohm 1/4W resistor. Adjust the DC voltage to 23 VDC.
The receiver should shutdown, losing raster and sound. Then the receiver should turn off automatically. Thisreaction indicates that the Hold-Down circuit is func-tioning properly. If the receiver does not shutdown, amalfunction is indicated and its cause must be foundand corrected.
4. To obtain picture again, remove the DC Supply and wait
a few minutes. Now turn on the receiver.
MULTI-SOUND SECTION ADJ USTMENTSNote: Multi-Sound Section must be adjusted after
IC801 (CPU / Signal Processor), IC3401 (MTSDecoder), or IC802 (EEPROM) is replaced.
INPUT LEVEL ADJ USTMENT1. Connect a signal to the antenna terminals with audio of
1 KH Z 100% modulation.2. Turn off the receiver and disconnect the AC power cord
(AC 120V line).3. Connect voltmeter (RMS) to TP317 and ground.4. While pressing the Menu key, reconnect the AC power
cord. The Service Menu will now appear.5. Select NO. 80 ATT (Attenuation) with the or key.6. Adjust the +or – key for a voltmeter reading of 400 ±20
mVrms at TP317.
SEPARATION ADJ USTMENT7. Turn off the receiver and disconnect the AC power cord
(AC 120V line).8. Connect oscilloscope CH1 to TP317 and CH2 to TP318
and ground.9. Connect an MTS TV/Stereo generator to antenna terminal.
10. While pressing the Menu key, reconnect the AC powercord. The Service Menu will now appear.
11. Select pilot, 300Hz audio frequency and Left modulatingsignal.
12. Select NO. 81 WDB (Wide Band) with the or key.
13. Adjust the + or – key for minimum low frequencies at TP317. See Figure 7.
14. Select 4 KHz audio frequency and Right modulating signal.15. Select NO. 82 SPC (Spectral) with the or key.16. Adjust the +or – key for minimum high frequencies at
TP318. See Figure 7.
Repeat adjustments (steps 11–16) until no further decreasesin amplitude can be obtained. Press the MENU key to turnoff the Service Menu display.
Minimize L leakage
Minimize R leakage
4KHz
300Hz
TP317 (R)
TP318 (L)
Figure 7. Separation Adjustments
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 12/56
SERVICE HINTS
POWER FAILURE DETECTOR
This unit is equipped with a Power Failure Detector function included in the CPU which checks for an abnormal condition in
the chassis power supplies, including the power supply derived from the Horizontal Output Transformer.
If, while the power is on, a failure is caused by any of the following that results in a low voltage supply, the CPU will turn theunit off in 1.5 seconds to prevent further damage:
• Failure within the power supply circuits.
• A short circuit in the load side from the supply.
•Stoppage of the Horizontal Output Oscillator caused by the X Radiation protection Hold-Down Circuit.
If, while the power is off, the power is switched on and any of these failures remains uncorrected, the CPU will shut off thepower within three seconds.
Check the following if the unit is turned off by the power failure detector.
1. Disconnect the AC power cord (120V AC line) for at least 10 seconds.2. Connect a DC Voltmeter to the following TEST POINTS.
3. Press the Power key and check for the proper voltage supplies.
4. If any of these voltages is low, the power failure detector should turn the unit off within three seconds.5. Check all circuits listed above.
Note: This unit is equipped with a Power Surge Protection feature included in the CPU. If power failure occurs three timeswithin 15 minutes, the CPU will automatically stop functioning to help prevent secondary damage. (TV will not turn onby pressing the power key.) To reset the operating programs within the CPU, disconnect the AC power cord for at least10 seconds.
4. Remove chassis completely by sliding it straight back.
PICTURE TUBE REMOVAL
CAUTION: Do not disturb the deflection yoke or magnetassembly on the picture tube neck. Care must be taken tokeep these assemblies intact, unless picture tube is beingreplaced. Discharge the picture tube to the coating beforehandling the tube.
1. Remove chassis, see Chassis Removal instructions.2. Place cabinet’s front face down on a soft surface.3. Remove the screw on each corner of the picture tube and
GENTLY lift the picture tube out of the cabinet.4. Install a replacement picture tube in reverse order.
Properly install the degaussing coil and picture tubegrounding lead on the picture tube. See Figure 2.
Note: If Picture Tube is being replaced, mount the DegaussingCoil properly on the tube. See Figure 2.
Figure 1. Cabinet Back Removal
AV2 INPUT
S-VIDEO
VIDEO
(MONO)
AUDIO
R
L
UHF / VHF / CATV75!
DEGAUSSINGCOIL
DEGAUSSINGCOIL HOLDER
TO PICTURE TUBESOCKET BOARDGROUND
DEGAUSSINGCOIL HOLDER
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 14/56
CHASSIS ELECTRICAL PARTS LISTCAUTION: To Protect against electrical shock and for continued product safety, refer to SAFETY PRECAUTIONS,
X-RADIATION PRECAUTIONS, HIGH VOLTAGE HOLD-DOWN TEST, and PRODUCT SAFETY NOTICE on Page 2.
Notes: Parts having Location Number are located on the following boards.
PRODUCT SAFETY NOTICEPRODUCT SAFETY SHOULD BE CONSIDERED WHEN A REPLACEMENT IS MADE IN ANY AREA OF A RECEIVER.COMPONENTS INDICATED BY A STAR ( ) IN THIS PARTS LIST AND THE SCHEMATIC DIAGRAM DESIGNATECOMPONENTS IN WHICH SAFETY CAN BE OF SPECIAL SIGNIFICANCE. IT IS PARTICULARLY RECOMMENDEDTHAT ONLY PARTS DESIGNATED ON THE FOLLOWING PARTS LIST BE USED FOR COMPONENT REPLACEMENTDESIGNATED BY A STAR. NO DEVIATIONS FROM RESISTANCE,WATTAGE,AND VOLTAGE RATINGS MAY BE MADEFOR REPLACEMENT ITEMS DESIGNATED BY A STAR.
SchematicLocation
Part No. Description SchematicLocation
Part No. Description
Note: Schematic part location numbers may not always match with the part descriptions. The part descriptions are correct and should be used.
CAPACITORSNOTES:Read description of the Capacitor as follows:
(Example)CERAMIC 100P K 50V
Rated Voltage Tolerance Symbols:less than 10PFA . .Not specifiedB . .±0.1PF C . .±0.25PF
D . .±0.5PF F . .±1PFG . .±2PF R . .+0.25 - 0PFS . .+0 - 0.25PF E . .+0 - 1PFmore than 10PFA . .Not specifiedB . .±0.1% C . .±0.25%D . .±0.5% F . .±1%G . .±2% H . .±3%
J . .±5% K . .±10%L . .±15% M . .±20%N . .±30% P . .+100 - 0%Q . .+30 - 10% T . .+50 - 10%U . .+75 - 10% V . .+20 - 10%W .+100 - 10% X . .+40 - 20%
Y . .+150 - 10% Z . .+80 - 20%Rated Value: P...Pico Farad U...Micro Farad
Please add this notice to the Service Manual listed below. REVISION 04
Category :
U.S.A. / CANADADestination :
J ULY / 15 / 2003Date :
20930-04Effective from : Chassis No.
SM780088-03REF : No.
NOTE: Match the Chassis No. on the unit’s back cover with the Chassis No. in the ServiceManual. If the Service Manual Chassis No. does not match the unit’s, additional ServiceLiterature is required. This chassis is similar to Chassis No. 20930-03. Only thedifference Service Information is given in this manual. For detailed Service Information,refer to the Original Service Manual and Notices for Chassis No. 20930-03 used in M odelDS20930 (SM780088-03).
1. IN THE CHASSIS ELECTRICAL PARTS LISTThe reason for change.
A : Misprint B : Quality Reliability C : StandardizationD : Design E : Add as a possible sub F : Schematic location changeG : Purchasing Request
Page &Section
SchematicLocation
Part No. Description Q’ty Interchange-ability Reason
Please add this notice to the Service Manual listed below. REVISION 03
Category :
DS20930Model:
U.S.A. / CANADADestination :
J ULY / 15 / 2003Date :
20930-03Effective from : Chassis No.
NOTE: Match the Chassis No. on the unit’s back cover with the Chassis No. in the Service Manual.If the Service Manual Chassis No. does not match the unit’s, additional Service Literatureis required. This chassis is similar to Chassis No. 20930-00, however , all Service Informationis given in this Notice for Chassis No. 20930-03 used in Model DS20930.
SAFETY INSTRUCTIONS
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 32/56
SAFETY PRECAUTIONSWARN ING: The chassis of this receiver has a floatingground with the potential of one half the AC line voltage in
respect to earth ground. Service should not be attempted byanyone not familiar with the precautions necessary whenworking on this type of equipment.The following precautions must be observed:1. An isolation transformer must be connected in the power
line between the receiver and the AC line before any ser-vice is performed on the receiver.
2. Comply with all caution and safety-related notes provid-
ed on the side of the cabinet, inside the cabinet, on thechassis, and the picture tube.
3. When replacing a chassis in the cabinet, always be certainthat all the protective devices are installed properly, suchas control knobs, adjustment covers, shields and barriers.
DO NOT OPERATE THIS TELEVISION RECEIVERWITHOUT THE PROTECTIVE SHIELD IN POSITION AND
PROPERLY SECURED.
4. Before replacing the back cover of the set, thoroughlyinspect the inside of the cabinet to see that no stray partsor tools have been left inside.Before returning any television to the customer, theservice technician must perform the following safetychecks to be sure that the unit is completely safe tooperate without danger of electrical shock.
ANTENNA COLD CHECK Remove AC plug from the 120 VAC outlet and place a
jumper across the two blades. Connect one lead of an ohm-meter to the jumpered AC plug, and touch the other lead toeach exposed antenna terminal (UHF and VHF antenna ter-minals). The resistance must measure between 1M ohm and5.2M ohm. Any resistance value below or above this rangeindicates an abnormality which requires corrective action.
LEAKAGE CURRENT CHECK Plug the AC line cord directly into a 120 VAC outlet. (Do notuse an isolation transformer for this check.) Use an AC volt-meter, that has 5000 ohms per volt or more sensitivity.Connect a 1500 ohm 10 watt resistor, paralleled by a 0.15 µF150 VAC capacitor, between a known good earth ground
X-RADIATION PRECAUTION The primary source of X-RADIATION in solid-state receivers isthe picture tube. The picture tube is specially constructed tolimit X-Ray emission. For continued X-RADIATION protection,the replacement tube must be the same type as the original(including the suffix letter in the part numbers). Excessive highvoltage may produce potentially hazardous X-RADIATION. Toavoid such hazards, the high voltage must be maintained withinspecific limits. Refer to the X-RADIATION WARNING NOTE onthe CHASSIS SCHEMATIC in this service manual for specifichigh voltage limits. If the high voltage exceeds specified limits,check the components specified on the chassis schematicdiagram and take the necessary corrective action. Carefullyfollow the instructions for the +B Voltage Check and the HighVoltage Check to maintain the high voltage within the specified
limits.
HIGH VOLTAGE HOLD-DOWN TEST To prevent X-RADIATION from the picture tube due toexcessive high voltage, a HOLD-DOWN circuit is provided inthe high voltage circuit. Every time the receiver is serviced,
0.15 µ F 150V AC
1500 ohm10 watt
Good earth groundsuch as a water pipe,conduit, etc.
AC OUTLET
TELEVISIONRECEIVER
READING SHOULD NOT EXCEED 750 mV.AC VOLTMETER
(5000 ohms per volt or more sensitivity)
To be touched to all of exposed metal parts.Voltmeter Hook-up for Leakage Current Check.
SERVICE ADJ USTMENTS
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 33/56
GENERAL This set has an On-screen Service Menu system included in the CPU that allows remote operation for most of the service adjustments. To enter the Service Menu, first disconnect the AC power cord. Then while pressing the MENU key on the front control panel , recon-nect the AC power cord. The adjustments can now be made with the remote control or front control panel keys.
ON-SCREEN SERVICE MENU SYSTEM1. Enter the Service Menu:
• While pressing the MENU key on the front control panel, reconnect the AC power cord. The Service Menu Display will nowappear. (See Figure 1.)
2. Service Adjustments:• Press the or key to select the desired service menu you want to adjust. (See page 4 for On-screen Service Menu.)
• Use the +or – key to adjust the data.3. Exit from the Service Menu:
• Press the MENU key to turn off the Service Menu display.
IC802 (EEPROM) REPLACEMENTWhen IC802 (EEPROM) is replaced, IC801 (CPU) will automatically write the initial reference data into IC802 for basic TV operation.However, the bus data should be checked and some bus data should be set up before attempting the service adjustments.(See pages 4 – 6 for detailed information.)
INITIAL BUS DATA SETUPNote:When IC802 (EEPROM) is replaced, change the following initial reference data for proper TV operation before
attempting the service adjustments.
1. Disconnect the AC power cord (AC 120V line).2. While pressing the MENU key on the front control panel , reconnect the AC power cord.
The Service Menu display will now appear.3. Select NO. 03 HP (H Phase) with or key. Adjust the data with +or – key for 14.4. Select NO. 04 VS (V Size) with or key. Adjust the data with +or – key for 33.5. Select NO. 07 VLN (V Lin) with or key. Adjust the data with +or – key for 13.6. Select NO. 10 VSC (V S Correction) with or key. Adjust the data with +or – key for 6.7. Select NO. 11 HBL (H Blanking Right) with or key. Adjust the data with +or – key for 1.8. Select NO. 12 HBL (H Blanking Left) with or key. Adjust the data with +or – key for 5.9. Select NO. 19 GD (Green Drive) with or key. Adjust the data with +or – key for 6.
10 Select NO 28PRE (PreshootAdj) with or key Adjust the data with +or key for 3
NO. DATAXX OPT XXX XXXXXXXX
Figure 1. Service Menu Display
ITEM NO.
TITLE BINARY DATA(8 bit)
DECIMAL DATA
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 34/56
Table 1. ON-SCREEN SERVICE MENU (Continued)When IC802 (EEPROM) is replaced check the bus data to confirm they are the same as below The shaded menu should be
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 35/56
When IC802 (EEPROM) is replaced, check the bus data to confirm they are the same as below. The shaded menu should bechecked and be set up or readjusted according to the procedures described in the following pages. Initial Setup Datamarked with an * should be changed from Initial Reference Data. (See page 3 for Initial Bus Data Setup.)
NO. TITLE INITIAL REFERENCE INITIAL SETUP RANGE OF DATA FUNCTIONDATA DATA
46 VL 4 4 0~7 Video Level47 EWD 39 39 0~63 EW DC
48 EWA 30 30 0~63 EW Amp
49 EWT 34 34 0~63 EW Tilt
50 EWP 7 7 0~7 EW Corner Top
51 EWB 8 8 0~7 EW Corner Bottom
52 HSC 7 7 0~7 Horiz Size Comp
53 SB 32 32 0~63 Sub Bright
54 SCO 7 14* 0~31 Sub Color55 STI 20 24* 0~31 Sub Tint
72 DRV64 64 0~127 Red Drive Adjustment (See Note 3 page 6.)
64 64 0~127 Blue Drive Adjustment (See Note 3 page 6.)
– 0 0 0~255 Red Bias Adjustment (See Note 4 page 6.)
73 – 0 0 0~255 Green Bias Adjustment (See Note 4 page 6.)
– 0 0 0~255 Blue Bias Adjustment (See Note 4 page 6.)
SERVICE ADJ USTMENTS (Continued)
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 36/56
PROGRAM CODES The microprossesor used in this model is a multi-purposetype and is used in several different models. To ensure
proper operation and the correct features for your particu-lar model, the Program Codes must be correct.
Note 1. Option Data 1 (NO. 57 OPT) should be decimal 100(01100100 binary). See page 3 INITIAL DATA SETUP, step12, for set up procedure. If this program code is wrong the
TV will not operate properly.
Note 2. Option Data 2 (NO. 58 OP2) should be decimal 32(00100000 binary). See page 3 INITIAL DATA SETUP, step13, for set up procedure. If this program code is wrong the
TV will not operate properly.
DRIVE / BIAS ADJ USTMENTSNote 3. Red/Blue Drive Adjustments in Service Menu NO.72 DRV: Adjust Red and Blue Drive Levels alternately with
1, 3, 7, and 9 keys on the remote control. (See Figure 2.) TheDrive Level adjustment data will be written in the ServiceMenu No. 18 and 20 automatically.
1 2 3
4 5 6
7 98
RB(–) RB(+)
BB(–) BB(+)
(N/A)
GB(–) (N/A) GB(+)
(N/A)
FOR RED BIAS ADJ USTMENT
FOR BLUE BIAS ADJ USTMENT
FOR GREEN BIAS ADJ USTMENT
Figure 2.
Figure 3.
1 2 3
4 5 6
7 98
RD(–) RD(+)
BD(–) BD(+)
(N/A)
(N/A) (N/A) (N/A)
(N/A)
FOR RED DRIVE ADJ USTMENT
FOR BLUE DRIVE ADJ USTMENT
Note 4. Red/Green/Blue Bias Adjustments in Service MenuNO. 73: Adjust each Bias Level with 1, 3, 4, 6, 7, or 9 key onthe remote control. (See Figure 3.) The Bias Level adjust-ment data will be written in the Service Menu No. 15 ~17automatically.
BIT FUNCTIONDATA
0 1
TV 00: TV0, 1 HOTEL 01: HOTEL
MONITOR 10: MONITOR11: INHIBITED (=TV)
2 VIDEO INPUT NONE YES
3, 4 CLOCK NOT USED
5 STEREO/MONO MONO STEREO
00: NONE6, 7 SURROUND 01: YES
10: NOT USED11: NOT USED
BIT FUNCTIONDATA
0 1
0 V–GUIDE YES NONE
1 COLOR ENHANCER NOT USED
2 INITIAL CHANNEL NOT USED
3 NOT USED NOT USED
4 PIP NOT USED
5 AV1/AV1, AV2 AV1 AV1, AV2
6 TONE/BASS, TREBLE NOT USED
7 GAME KEY NONE YES
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 37/56
ANTENNA CONNECTIONS This receiver is designed for UHF/VHF reception. A 75 ohmterminal is provided for UHF and VHF receptions. When
connecting a CATV antenna system, connect the 75 ohmcoaxial cable directly to the 75 ohm terminal. For 300 ohmVHF antenna, use an adapter (not included with the TV set).
CIRCUIT PROTECTIONFuse F601 (4A) is included in the AC line. This fuse must bereplaced with the proper fuse (see Parts List).
+B VOLTAGE CHECK Connect Voltmeter +lead to TJ 1 130V and – lead to ground(TE7). Connect receiver to AC 120V line. Tune receiver to anactive channel. Reset the picture controls to the FACTORYPRESET levels (press remote control RESET key twice).Voltage must measure between +128.0V and +132.0V. If thevoltage is out of this range, the power circuit must bechecked. No +B adjustment is provided on this chassis.
HORIZONTAL CENTERING ADJ USTMENT1. Tune receiver to an active channel.2. Check that picture is in the horizontal center of TV screen.
If picture is not centered horizontally, perform steps 3 ~6.3. Turn off the receiver and disconnect the AC power cord.
4. While pressing the MENU key, reconnect the AC powercord. The Service Menu display will now appear.
5. Select NO. 03 HP (Horizontal Phase) with or key.6. Adjust the data with +or – key for horizontal center. To
turn off the Service Menu display, press the MENU key.
VERTICAL SIZE ADJ USTMENT1. Tune receiver to an active channel.2. Check the vertical size of the picture. If the vertical size is
too large or small, perform steps 3 ~6.
3. Turn off the receiver and disconnect the AC power cord.4. While pressing the MENU key, reconnect the AC powercord. The Service Menu display will now appear.
5. Select NO. 04 VS (Vertical Size) with or key.6. Adjust the data with +or – key for full scan. To turn off
the Service Menu display, press the MENU key.
VERTICALCENTERINGADJ USTMENT
VCO ADJ USTMENTNote: VCO must be adjusted after IC101 (Signal Processor),
IC802 (EEPROM) or T151 (VCO Coil) is replaced.
1. Tune receiver to an active channel.2. Set the picture controls to the Sports level.3. Connect digital voltmeter + lead to pin 58 of IC101 and
– lead to ground (TE 7).4. Confirm a reading of 3.6 ±0.2 VDC.5. If voltage is out of specifications adjust T151 for
3.6 ±0.2 VDC.
RF AGC ADJ USTMENT1. Tune receiver to strongest VHF station in your area.2. Set contrast and brightness controls for maximum.3. Turn off the receiver and disconnect the AC power cord
(120V AC line).4. While pressing the MENU key, reconnect the AC power
cord. The Service Menu display will now appear.5. Select NO. 42 RAD (RF AGC Delay) with or key.6. Adjust the data with + or – key in the direction which
causes snow to appear; then in the opposite directionuntil the snow just disappears.
7.To turn off the Service Menu display, press the MENU key.VIDEO LEVEL1. Connect color-bar generator to antenna terminals.2. Turn off the receiver and disconnect the AC power cord
(AC 120V line).3. Connect oscilloscope to TP16 (Q202 emitter) and ground.4. While pressing the Menu key, reconnect the AC power
cord. The Service Menu will now appear.5. Select NO. 46 VL (Video Level) with the or key.
6. Adjust the +or – key for an oscilloscope reading of 1.0 ±0.1 VP-P at TP16. Press the MENU key to turn off theService Menu display.
CAUTIONFOR CONTINUED PROTECTION AGAINSTA RISK OF FIRE, REPLACE ONLY WITH
THE SAME TYPE 4A, 125V FUSE.ATTENTION : POUR MAINTENIR LA PRO-TECTION CONTRE LES RISQUESD’ INCENDIE UTILISER UN FUSIBLE DERECHANGE DE MEME TYPE 4A, 125V.
4A 125V
1.0 ±0.1 VP-P
Figure 4.
SERVICE ADJ USTMENTS (Continued)
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 38/56
GRAYSCALE ADJ USTMENT1. Set the picture controls to the Sports levels or Reset
(use MENU key and or key or RESET key).2. Turn off the receiver and disconnect the AC power cord
(120V AC line).3. While pressing the MENU key, reconnect the AC power
cord. The Service Menu display will now appear.4. Select NO. 15 RB (Red Bias), NO. 16 GB (Green Bias),
and NO. 17 BB (Blue Bias) with or key and set eachdata to 0 with +or – key.
5. Select NO. 18 RD (Red Drive) and NO. 20 BD (Blue Drive)with or key and set each data to 64 with +or – key.
6. Set NO. 19 GD (Green Drive Reduction) data to 6, NO. 53SB (Sub-Brightness) data to 32, NO. 54 SCO (Sub Color)data to 14, NO. 55 STI (Sub Tint) to 24, and NO. 56 SSH(Sub Sharpness) data to 12 with or , and +or – keys.
7. Turn Screen Control (T402) to minimum (fully counter-clockwise).
8. Select the Service Menu NO. 73 (Bias Adjustments) withor key.
9. Advance Screen Control (T402) clockwise to obtain justvisible one color line. If line does not appear, place this
control to maximum (fully clockwise).10. Raise each Bias Level with 3, 6, and 9 keys to obtain justvisible white line. See Figure 5.
11. Select the Service Menu NO. 72 DRV (Drive Adjustments)with or key.
12. Adjust Red and Blue Drive Levels alternately with 1, 3,7, or 9 key to produce normal black and white picture inhighlight areas. (See Figure 6.)
BRIGHTNESS LEVEL ADJ USTMENT
Note: Grayscale, RF AGC, Video Level, and High Voltage Check
must be adjusted before attempting Brightness LevelAdjustment.
1. Connect a color-bar generator to the antenna terminals.2. Switch the generator to the crosshatch pattern.3. Reset the picture controls to the Sports levels.4. Connect voltmeter (high impedance) +lead to terminal
TP51 and – lead to terminal TP50 on main board. Setvoltmeter for 1.5V ~3V range.
5. Turn off the receiver and disconnect the AC power cord.6. While pressing the MENU key, reconnect the AC power
cord. The Service Menu display will now appear.7. Select NO. 53 SB (Sub Brightness) with or key.8. Adjust the data with +or – key for 680mVDC.9. Press the MENU key to turn off the Service Menu display.
10. Check brightness level on every active channel, readjust(repeat steps 5 ~9), if necessary.
Note: Do not set to excessive brightness level, otherwisethe contrast level will be suppressed.
HIGH VOLTAGE HOLD-DOWN TESTEvery time the receiver is serviced, the HIGH VOLTAGEHOLD-DOWN circuit must be tested for proper operation byfollowing these steps:1. Connect receiver to 120V AC line. Tune receiver to
active channel. Reset the picture controls to the Sportslevels.
2. Check that the voltage measured between TP7 and TE7(ground side) is within 16.5 VDC to 21 VDC. If the volt-
age is out of this range, the Hold-Down Circuit must bechecked.
3. Connect a DC Voltage supply to TP7 and TE7 through a100 ohm 1/4W resistor. Adjust the DC voltage to 23 VDC.
The receiver should shutdown, losing raster and sound. Then the receiver should turn off automatically. Thisreaction indicates that the Hold-Down circuit is func-tioning properly. If the receiver does not shutdown, amalfunction is indicated and its cause must be found
and corrected.4. To obtain picture again, remove the DC Supply and waita few minutes. Now turn on the receiver.
HIGH VOLTAGE CHECK Note: +B (+130V) Voltage Check and Grayscale Adjustment
b l d b f i hi h l
1 2 3
4 5 6
7 98
RB(–) RB(+)
BB(–) BB(+)
(N/A)
GB(–) (N/A) GB(+)
(N/A)
FOR RED BIAS ADJ USTMENT
FOR BLUE BIAS ADJ USTMENT
FOR GREEN BIAS ADJ USTMENT
Figure 5. Remote Control Number keys’ functions inService Menu NO. 73
1 2 3
4 5 6
7 98
RD(–) RD(+)
BD(–) BD(+)
(N/A)
(N/A) (N/A) (N/A)
(N/A)
Figure 6. Remote Control Number keys’ functions in
FOR RED DRIVE ADJ USTMENT
FOR BLUE DRIVE ADJ USTMENT
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 39/56
SOUND ADJ USTMENT1. Connect a color-bar generator to the antenna terminals
with audio signal of 1KHz at 100% modulation.2. Set the picture controls to the Sports levels3. Connect oscilloscope + lead to TP21 (base Q135) and
– lead to ground.4. Turn off the receiver and disconnect the AC power cord
(AC 120V line).5. While pressing the Menu key, reconnect the AC power
cord. The Service Menu will now appear.6. Select NO. 45 FL (FM Level) with the or key.7. Adjust the data with the +or – key for an oscilloscope
reading of 0.693 ±10% VP-P at TP21.8. Press the MENU key to turn off the Service Menu display
and disconnect the oscilloscope from the chassis.
MULTI-SOUND SECTION ADJ USTMENTSNote: Multi-Sound Section must be adjusted after
IC101 (Signal Processor), IC3401 (MTS Decoder), orIC802 (EEPROM) is replaced.
INPUT LEVEL ADJ USTMENT1. Connect a signal to the antenna terminals with audio of
1 KH Z 100% modulation.2. Turn off the receiver and disconnect the AC power cord
(AC 120V line).3. Connect voltmeter (RMS) to TP317 and ground.4. While pressing the Menu key, reconnect the AC power
cord. The Service Menu will now appear.
5. Select NO. 60 ATT (Attenuation) with the or key.6. Adjust the +or – key for a voltmeter reading of 400 ±20mVrms at TP317.
SEPARATION ADJ USTMENT7. Turn off the receiver and disconnect the AC power cord
(AC 120V line).8. Connect oscilloscope CH1 to TP317 and CH2 to TP318
and ground.9. Connect an MTS TV/Stereo generator to antenna terminal.
10. While pressing the Menu key, reconnect the AC powercord. The Service Menu will now appear.
11. Select pilot, 300Hz audio frequency and Left modulatingsignal.
12. Select NO. 61 WDB (Wide Band) with the or key.13. Adjust the + or – key for minimum low frequencies at
TP317. See Figure 8.14. Select 4 KHz audio frequency and Right modulating signal.15. Select NO. 62 SPC (Spectral) with the or key.16. Adjust the +or – key for minimum high frequencies at
TP318. See Figure 8.
Repeat adjustments (steps 11–16) until no further decreasesin amplitude can be obtained. Press the MENU key to turnoff the Service Menu display.
Minimize L leakage
Minimize R leakage
4KHz
300Hz
TP317 (R)
TP318 (L)
Figure 8. Separation Adjustments
0.693 ±10% VP-P
Figure 7.
PURITY AND CONVERGENCE ADJ USTMENTSCAUTION:ThePurityandConvergenceadjustmentshavebeenmadeatthefactory. Readjustmentsshouldbemade
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 40/56
SIX-POLEMAGNET TABS FOUR-POLE
MAGNET TABS
ANGLEOF TABS
PURITYMAGNETTABS
4 32
1
FOCUS GAP(G3-G4)
Figure 2. Purity and Convergence Magnets
PURITY ADJ USTMENTS1. When replacing picture tube or deflection yoke, mount
deflection yoke and purity and convergence magnetsassembly properly. See Figure 1. Position the picturetube facing east or west. Demagnetize the picture tubeand receiver using an external degaussing coil. Setreceiver to Service Menu NO. 73 (no vertical sweep)while degaussing.
2. Place the yoke on tube neck fully forward against glass.3. Place the CPM on the tube neck aligning the center of
the purity magnet tabs over center of Focus Gap (G3 & G4).See Figure 2.
4. Connect a color-bar generator to the antenna terminal.Switch the generator to a white field. Move yoke back-ward on the neck until a uniform white field is obtained.
5. Allow 30 minutes warm up on a blank white field (highintensity grayscale).Note: If white field cannot be obtained check GrayscaleAdjustments on page 8.
6. Reset the picture controls to the Auto levels. Select a greenraster, either with the signal generator or by adjusting thebias controls. If a signal generator is used for this step skipto Step 11. If the bias controls will be used go to step 7.
7. Adjust Service Menu NO. 15 RB (Red Bias), NO. 16 GB(Green Bias), and NO. 17 BB (Blue Bias) data each to 00.
8. Select Service Menu NO. 73 (no vertical sweep).9. Adjust the Screen Control counterclockwise until the
horizontal scan line is no longer visible.10. Select Service M enu NO. 16 GB (Green Bias) and
increase the data to produce a green raster. If retrace
lines appear reduce screen control slightly.11. Pull yoke back on tube neck to obtain three-color raster
(blue, green and red).12. Adjust the angle between the two purity magnet tabs to
center the vertical green belt in the picture tube. Do notrotate tabs. See Figure 3.
13. Slowly slide the deflection yoke forward until a uniformgreen screen is obtained.
14. Check the purity of the red and blue screens for unifor-
mity. Turn off other colors to check (use bias controls oruse generator). If necessary, readjust the yoke positionuntil all screens are pure.
15. If bias controls and screen control were used to set puri-ty reset Grayscale and Bright Level. Refer to GrayscaleAdjustment on page 8 and Brightness Level Adustment
RUBBERWEDGE
DEFLECTION YOKE
DEFLECTION YOKEMOUNTING SCREW
Figure 1. Deflection Yoke Movement
CAUTION:The Purity and Convergence adjustments have been made at the factory. Readjustments should be madeonly after the picture tube or deflection yoke is replaced. Follow the steps below for necessary readjustments.
CONVERGENCE ADJ USTMENT
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 41/56
BLUEGREEN
RED
BLUEGREENRED
BLUEGREEN
RED
CENTER CONVERGENCE ADJ USTMENT1. Connect a crosshatch generator to antenna terminals.2. Set Contrast to low level to eliminate blooming. Reduce
Brightness level to obtain black background if necessary.
3. Adjust the angle between the four-pole magnet tabs 1and 2 (Figure 2), and superimpose the red and blue ver-tical lines in the center area of the picture screen. SeeFigure 4.
4. Keeping the tabs at the same angle, rotate them togetherto superimpose the blue and red horizontal lines in thecenter area of the picture screen. See Figure 4.
5. Adjust the six-pole magnet tabs 3 and 4 so the con-verged red/blue line is superimposed on the green line.
This is the same procedure used in steps 3 and 4. SeeFigure 5.
BLUE
RED
Adjust four-pole tabs angle tosuperimpose blue and red verticalline.
Adjust four-pole tabs togetherto superimpose red and bluehorizontal line.
Figure 4. Blue and Red Line Movement
BLUE / RED
GREEN
REDGREEN
BLUE
RED
GREEN
BLUE
Line movement when adjustingtop of yoke in and out.
OUTER AREA CONVERGENCE ADJ USTMENT The outer area convergence is performed by positioning of the yoke as follows:
1. Move the top of the yoke toward or away from the pic-
ture tube. This movement will affect the vertical lines atthe top and bottom and the horizontal lines at the sides.See Figure 6.
2. Check that splits at 12 o’clock and 6 o’clock positionsare minimized, adjust yoke for best compromise.Secure with wedge at 12 o’clock position. See Figure 1.
3. Move the side of the yoke toward or away from the pic-ture tube to converge the horizontal lines at the top andbottom and the vertical lines at the sides. See Figure 7.
4. Check that splits at 12 o’clock and 6 o,clock are mini-mized, adjust yoke for best compromise. Secure yokeposition with the side wedges. See Figure 1.
Note:When re-using the rubber wedges, apply a smallamount of silicone rubber adhesive or hot melt toeach of the wedges.
Figure 6. Top of Yoke Movement
SERVICE HINTS
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 42/56
POWER FAILURE DETECTOR
This unit is equipped with a Power Failure Detector function included in the CPU which checks for an abnormal condition inthe chassis power supplies, including the power supply derived from the Horizontal Output Transformer.
If, while the power is on, a failure is caused by any of the following that results in a low voltage supply, the CPU will turn theunit off in 1.5 seconds to prevent further damage:
• Failure within the power supply circuits.
• A short circuit in the load side from the supply.
• Stoppage of the Horizontal Output Oscillator caused by the X Radiation protection Hold-Down Circuit.
If, while the power is off, the power is switched on and any of these failures remains uncorrected, the CPU will shut off thepower within three seconds.
Check the following if the unit is turned off by the power failure detector.
1. Disconnect the AC power cord (120V AC line) for at least 10 seconds.2. Connect a DC Voltmeter to the following TEST POINTS.
3. Press the Power key and check for the proper voltage supplies.4. If either of these voltages is low, the power failure detector should turn the unit off within three seconds.5. Check all circuits listed above.
Note: This unit is equipped with a Power Surge Protection feature included in the CPU. If power failure occurs three timeswithin 15 minutes, the CPU will automatically stop functioning to help prevent secondary damage. (TV will not turn onby pressing the power key.) To reset the operating programs within the CPU, disconnect the AC power cord for at least10 seconds.
TJ 6 5VD429 Cathode 5V
MECHANICAL DISASSEMBLIES
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 43/56
CABINET BACK REMOVAL1. Refer to Figure 1, remove 8 screws.2. Pull off cabinet back and remove.
CHASSIS REMOVAL1. Remove cabinet back.2. Discharge the picture tube anode (2nd anode lead) to the
4. Remove chassis completely by sliding it straight back.
Figure 1. Cabinet Back Removal
PICTURE TUBE REMOVAL
CAUTION: Do not disturb the deflection yoke or magnetassembly on the picture tube neck. Care must be taken tokeep these assemblies intact, unless picture tube is beingreplaced. Discharge the picture tube to the coating beforehandling the tube.
1. Remove chassis, see Chassis Removal instructions.2. Place cabinet’s front face down on a soft surface.3. Remove the screw on each corner of the picture tube and
GENTLY lift the picture tube out of the cabinet.4. Install a replacement picture tube in reverse order.
Properly install the degaussing coil and picture tubegrounding lead on the picture tube. See Figure 2.
Note: If Picture Tube is being replaced, mount the DegaussingCoil properly on the tube. See Figure 2.
DEGAUSSINGCOIL
DEGAUSSINGCOIL HOLDER
TO PICTURE TUBESOCKET BOARDGROUND
DEGAUSSINGCOIL HOLDER
AV2 INPUT
S-VIDEO
VIDEO
(MONO)
AUDIO
R
L
UHF / VHF / CATV75!
CHASSIS ELECTRICAL PARTS LISTCAUTION: To Protect against electrical shock and for continued product safety, refer to SAFETY PRECAUTIONS,
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 44/56
X-RADIATION PRECAUTIONS, HIGH VOLTAGE HOLD-DOWN TEST, and PRODUCT SAFETY NOTICE on Page 2.
Notes: Parts having Location Number are located on the following boards.Numbers under 700 Series . . . . . . . . . . . . . . . . . . . . .On the Main Board.Numbers 700 Series . . . . . . . . . . . . . . . . . . . . . . . . . . .On the Picture Tube Socket Board.Numbers 900 Series . . . . . . . . . . . . . . . . . . . . . . . . . . .Out of Board.All Other Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . .On the Main Board
PRODUCT SAFETY NOTICEPRODUCT SAFETY SHOULD BE CONSIDERED WHEN A REPLACEMENT IS MADE IN ANY AREA OF A RECEIVER.COMPONENTS INDICATED BY A STAR ( ) IN THIS PARTS LIST AND THE SCHEMATIC DIAGRAM DESIGNATECOMPONENTS IN WHICH SAFETY CAN BE OF SPECIAL SIGNIFICANCE. IT IS PARTICULARLY RECOMMENDEDTHAT ONLY PARTS DESIGNATED ON THE FOLLOWING PARTS LIST BE USED FOR COMPONENT REPLACEMENTDESIGNATED BY A STAR. NO DEVIATIONS FROM RESISTANCE,WATTAGE,AND VOLTAGE RATINGS MAY BE MADEFOR REPLACEMENT ITEMS DESIGNATED BY A STAR.
SchematicLocation
Part No. Description SchematicLocation
Part No. Description
Note: Schematic part location numbers may not always match with the part descriptions. The part descriptions are correct and should be used.
CAPACITORSNOTES:Read description of the Capacitor as follows:
(Example)CERAMIC 100P K 50V
Rated Voltage Tolerance Symbols:less than 10PFA . .Not specifiedB . .±0.1PF C . .±0.25PF
D . .±0.5PF F . .±1PFG . .±2PF R . .+0.25 - 0PFS . .+0 - 0.25PF E . .+0 - 1PFmore than 10PFA . .Not specifiedB . .±0.1% C . .±0.25%D . .±0.5% F . .±1%G . .±2% H . .±3%
J . .±5% K . .±10%L . .±15% M . .±20%N . .±30% P . .+100 - 0%
Q . .+30 - 10% T . .+50 - 10%U . .+75 - 10% V . .+20 - 10%W .+100 - 10% X . .+40 - 20%
Y . .+150 - 10% Z . .+80 - 20%Rated Value: P...Pico Farad U...Micro Farad
Material:CERAMIC . . . . . .CeramicMT PAPER Metalized Paper
C001 404 087 2801 ELECT 0.22 M 50VC002 404 087 2801 ELECT 0.22 M 50VC003 403 235 5701 CERAMIC 5600P K 50VC004 403 235 5701 CERAMIC 5600P K 50VC006 403 224 6108 CERAMIC 0.01U K 50VC010 404 087 2306 ELECT 220U M 25VC011 404 087 2306 ELECT 220U M 25VC012 404 088 5702 ELECT 22U M 16VC015 404 084 3108 ELECT 330U M 16VC101 404 084 2408 ELECT 470U M 6.3VC103 403 224 6108 CERAMIC 0.01U K 50VC106 404 084 4006 ELECT 2.2U M 50VC131 404 084 3801 ELECT 1U M 50VC133 403 224 6108 CERAMIC 0.01U K 50VC134 403 224 5705 CERAMIC 1000P K 50VC136 401 150 6001 MT-GLAZE 0.000 ZA 1/10WC137 403 364 7508 CERAMIC 10P J 50VC141 403 224 6108 CERAMIC 0.01U K 50VC142 403 343 4603 CERAMIC 0.022U K 50V
C143 403 224 6108 CERAMIC 0.01U K 50VC146 403 224 6108 CERAMIC 0.01U K 50VC147 404 084 2200 ELECT 100U M 6.3VC151 404 084 3702 ELECT 0.47U M 50VC153 404 084 3702 ELECT 0.47U M 50VC161 403 357 9601 CERAMIC 0.1U Z 50VC211 404 084 6901 NP ELECT 1U M 50V
SchematicLocation
Part No. Description
C285 403 224 6108 CERAMIC 001U K 50V C632 404 088 2909 CERAMIC 1000P M 250V
SchematicLocation
Part No. Description
8/13/2019 DS20930-1
http://slidepdf.com/reader/full/ds20930-1 45/56
C285 403 224 6108 CERAMIC 0.01U K 50VC401 404 084 3306 ELECT 470U M 16VC402 403 224 6108 CERAMIC 0.01U K 50VC403 404 086 6800 POLYESTER 6800P J 63VC405 404 084 6901 NP-ELECT 1U M 50VC406 403 075 7101 CERAMIC 1000P K 500VC407 403 076 3102 CERAMIC 3900P K 500VC408 404 085 4609 ELECT 47U M 35VC411 404 077 4402 MT-POLYPRO 7200U H 1.5KV
![1 1 1 1 1 1 1 ¢ 1 , ¢ 1 1 1 , 1 1 1 1 ¡ 1 1 1 1 · 1 1 1 1 1 ] ð 1 1 w ï 1 x v w ^ 1 1 x w [ ^ \ w _ [ 1. 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ð 1 ] û w ü](https://static.documents.pub/doc/80x56/5f40ff1754b8c6159c151d05/1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-w-1-x-v.jpg)
![$1RYHO2SWLRQ &KDSWHU $ORN6KDUPD +HPDQJL6DQH … · 1 1 1 1 1 1 1 ¢1 1 1 1 1 ¢ 1 1 1 1 1 1 1w1¼1wv]1 1 1 1 1 1 1 1 1 1 1 1 1 ï1 ð1 1 1 1 1 3](https://static.documents.pub/doc/80x56/5f3ff1245bf7aa711f5af641/1ryho2swlrq-kdswhu-orn6kdupd-hpdqjl6dqh-1-1-1-1-1-1-1-1-1-1-1-1-1-1.jpg)
