JVC TM-A101G/E Service Manual Download Page 28

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No. 51921

TM-A101G

DEFLECTION CIRCUIT ADJUSTMENT

There are 4 modes of DEFLECTION adjustment depending upon the kind of input signals.

The adjustments must always be carried out in regular sequence given below.

SIGNAL MODE

SERVICE NUMBER

SETTING VALUE

50Hz (PAL)

4:3

60Hz (NTSC)

+ DA

50Hz (PAL)

+ DB

16:9

60Hz (NTSC)

+ DA

+ DC

If you change the figures in the course of the adjustments by returning to the preceding steps, all adjustments come to nothing.

The screen aspect ratio 4 : 3 at 50Hz (PAL) is regarded as the reference value for all adjustments. The other values obtained in the

adjustments using other signals become the offset values as opposed to the reference values.

Item

Test equipment

Test points

Adjustment

locations

Adjustment procedure

H. Center

H. Size

Adjustment

Signal generator

(Crosshatch pattern)

D01 (H.POSITION)

[SERVICE MENU]

L502(H. SIZE COIL)

[MAIN PWB]

1. Input a PAL (50Hz) crosshatch pattern signal.

2. Select DEFLECTION BLOCK mode from

<BLOCK SELECT> screen.

3. Select

D01

item.

4. Adjust D01 to align the picture center with the

CRT center.

5. Adjust L502 to set horizontal size to

90%

6. Repeat above step 4 and 5 to adjust correctly.

V. Center

Adjustment

Signal generator

(Circle pattern)

S401

(V.CENTER SW)

[MAIN PWB]

7. Input the circle pattern signal.

8. Adjust S401 to agree with CRT center and signal

center of vertical direction.

90%

100%

SCREEN SIZE

PICTURE SIZE

100%

Summary of Contents for TM-A101G/E

Page 1: ...101G E TM A101G U CONTENTS SPECIFICATIONS 2 Ӡ OPERATING INSTRUCTIONS APPENDIX 1 1 SAFETY PRECAUTIONS 3 FEATURES 5 SPECIFIC SERVICE INSTRUCTIONS 6 SERVICE ADJUSTMENTS 11 Ӡ STANDARD CIRCUIT DIAGRAM APPENDIX 2 1 PARTS LIST 35 BASIC CHASSIS S2M1 SERVICE MANUAL COLOUR VIDEO MONITOR ...

Page 2: ...Hz TM A101G U High Voltage 21 0kVϡ23 0kV Power consumption 0 43A TM A101G E 0 61A TM A101G U Signal input output VIDEO A Composite video signal BNC terminal 1V p p 75 negative sync 1 bridge connected output possible with automatic termination VIDEO B Composite video signal BNC terminal 1V p p 75 negative sync 1 bridge connected output possible with automatic termination AUDIO A Monaural RCA pin 50...

Page 3: ... by the manufacturer of the complete product 8 Do not check high voltage by drawing an arc Use a high voltage meter or a high voltage probe with a VTVM Discharge the picture tube before attempting meter connection by connecting a clip lead to the ground frame and connecting the other end of the lead through a 10k 2W resistor to the anode button 9 When service is required observe the original lead ...

Page 4: ...acteristics are identified in the Parts List of Service Manual Electrical components having such features are identified by shading on the schematics and by on the Parts List in the Service Manual The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement part shown in the Parts List of Service Manual may cause shock fire or other hazards...

Page 5: ... IN1 10 AUDIO MUTE 36 SDA2 11 ASP REM 37 SDA1 12 NC 38 SCL2 13 Y C SELECT 39 SCL1 14 POWER LED 40 NC 15 B1 PROTECT 41 NTSC 0TH 16 REMOCON 42 SECAM 0TH 17 P CHK 43 VIDEO B 18 INP REM 44 VIDEO A 19 VIDEO A MUTE 45 BUS FREE 20 VIDEO B MUTE 46 X RAY 21 Y C MUTE 47 SDA3 22 NC 48 SCL3 23 NC 49 YS 24 X IN 50 B 25 X OUT 51 G 26 VSS 52 R I2C BUS FLOW CHART SCL1 SDA1 SCL2 SDA2 SCL1 SDA1 SCL2 SDA2 IC731 Micr...

Page 6: ...chassis base toward you 2 Follow the same steps when removing the other hand chassis base REMOVING THE BOTTOM COVER z Remove the chasssis base 1 Set the CRT front surfase downward and stand the bottom cover to facing it toward you At this time care must be exercised not to damage the front panel and CRT surface 2 As shown in the Fig 2 remove the 2 screws marked 3 Slightly raise the bottom cover an...

Page 7: ...ONT PANEL ASS Y CRT SOCKET PWB TOP COVER CRT CLAW CHASSIS BASE SPEAKER SIGNAL PWB MAIN PWB 1 2 POWER DEF Bolck FBT MAIN PWB 2 2 FRONT CONTROL Block TERMINAL BRACKET REAR PANEL POWER CORD BOTTOM COVER CHASSIS BASE Fig 2 Fig 3 ...

Page 8: ...e value is different select the item and set the correct value 6 Adjust the front control items Adjust the CHROMA PHASE CONTRAST and BRIGHT Not all items can be adjusted as expected if the signal has not been input correctly in the adjustments 7 Confirm the items of SERVICE MENU Confirm the each item of the SERVICE MENU Refer to the corresponding page to operate the SERVICE MENU SIGNAL BLOCK WHITE...

Page 9: ...LOCK OFF STATUS DISPLAY ON INPUT REMOTE OFF ASPECT REMOTE OFF INITIAL SETTING OF THE MENU SCREEN TABLE Setting item Setting content Range Initial setting value SHARPNESS 00 ϡ 05 03 COLOUR SYSTEM AUTO NTSC PAL AUTO ASPECT RATIO 4 3 16 9 4 3 INITIAL SETTING OF FRONT PANEL CONTROLS Control item Initial setting value INPUT SELECT A CHROMA 00 PHASE 00 CONTRAST 00 BRIGHT 00 VOLUME 20 ON OFF ON OFF ON OF...

Page 10: ...CAL FREQUENCY 60Hz C40 TRAP Q NTSC C13 VERTICAL DELAY NTSC C41 TRAP Q PAL C14 VERTICAL DELAY PAL C42 TRAP F0 NTSC C15 VERTICAL DELAY SECAM C43 TRAP F0 PAL C16 VERTICAL DELAY BLACK AND WHITE C44 TOF SW NTSC C17 S DELAY NTSC C45 TOF SW PAL C18 S DELAY PAL C46 TOF Q NTSC C19 S DELAY SECAM C47 TOF Q PAL C20 S DELAY BLACK AND WHITE C48 TOF F0 NTSC C21 BRIGHT VERTICAL C49 TOF F0 PAL C22 SHARP CENTER VAL...

Page 11: ...High voltage meter The wave form of signals refer following figure ADJUSTMENT ITEMS FOCUS AND SCREEN ADJUSTMENT HOLES The FOCUS and SCREEN adjustment holes are on the side panel CAUTION Be sure to use a non metalic driver for adjusting there VRs A metalic driver can cause damage by shorting STANDARD VIDEO SIGNAL PAL NTSC COLOUR BAR 0 525Vb w 0 SETUP BURST PAL 0 3V p p NTSC 0 286V p p 75 saturation...

Page 12: ...T CHROM A PHASE VOLUME SELECT VIDEO A IND SW VIDEO B IND SW POWER IND SW V CENTER SW S401 S1 FUSE F901 DEG AC S901 E2 MAIN PWB 1 2 POWER DEF Block FRONT SIGNAL PWB TO CRT SOCKET PWB TERMINAL BRACKET Earth wire FBT TO DEF YOKE L502 H SIZE COIL 1 GND 2 X RAY2 3 X RAY1 4 NC 5 TP 91 B1 SW LED SW LED DY B FOCUS VR SCREEN VR UPPER LOWER ...

Page 13: ...TM A101G 13 TP E TP 47B E1 S SPEAKER Y CRT SOCKET PWB SOLDER SIDE Y TP 47G U CRT EARTH WIRE BRAIDED ASS Y CN001 UPPER SIGNAL PWB UPPER TO MAIN PWB VIDEO A VIDEO B AUDIO A AUDIO B REMOTE INPUT ASPECT SHIELD CASE ...

Page 14: ...ATION OF THE SERVICE MENU 1 HOW TO ENTER THE SERVICE MENU Ο Press MENU key and VOLUME SELECT UP key simultaneously Fig 1 The letter S appears at the upper left of the screen Fig 2 Π While displaying the letter S press MENU key and CHROMA PHASE key simultaneously Fig 1 The screen display PLEASE DON T TOUCH Fig 3 Ρ WHILE displaying the letters above mentioned press VOLUME SELECT UP key or DOWN key t...

Page 15: ...ress MENU key then return to the BLOCK SELECT screen Again press MENU key then return to the normal screen SIGNAL BLOCK WHITE BALANCE BLOCK DEFLECTION BLOCK CONTROL BLOCK BLOCK SELECT SIG W B DEF CNTL EXIT CNTL DEF W B SIG EXIT Function Display Front Panel Key Arrangement SIGNAL BLOCK Press CHROMA PHASE key Enter to signal circuit adjustment mode WHITE BALANCE BLOCK Press CONTRAST BRIGHT key Enter...

Page 16: ...E BLOCK ΟIn the BLOCK SELECT screen press the CONTRAST BRIGHT key ΠThen WHITE BALANCE menu screen is displayed Fig 8 ΡIn this case key function is replaced as shown below There are several modes of WHITE BALANCE adjustment Select the various WHITE BALANCE mode from this menu screen Press the MENU key few times then exit from the WHITE BALANCE BLOCK screen to return to the BLOCK SELECT screen WHITE...

Page 17: ...e DRIVE adjustment mode Fig 11 In this case key function is replaced as shown below ΠWhenever press the CHROMA PHASE key change the R DRIVE or B DRIVE adjustment mode ΡCONTRAST BRIGHT key is the switch of the screen display If necessary you can shut off the display Carefully values of adjustment items are changed while shut off the screen display z Refer to the High Light adjustment corresponding ...

Page 18: ... the R CUTOFF But in order to adjust in correct condition must be adjust the other colour G or B Therefore necessary to change the service numbers and adjusts each value Ρ Press the CHROMA PHASE key to select the service number This mode is WHITE BALANCE BLOCK full adjustment mode both Low light and High light are able to adjust WHITE BALANCE W01 mode DISP EXIT ʷ ʝ ʝ ʝ ʧ ʧ ʧ W01 Fig 12 DISP EXIT ʷ...

Page 19: ...st it Ο In the BLOCK SELECT screen press the VOLUME SELECT UP key Π Then the CONTROL BLOCK adjustment screen is displayed Fig 16 Ρ The original front key function replaced with the other function displayed at the lower side of the screen as shown below SIGNAL SCREEN DISPLAY 50HzӸ4 3 D01ϡD05 60HzӸ4 3 DA1ϡDA5 50HzӸ16 9 DB1ϡDB5 60HzӸ16 9 DC1ϡDC5 Fig 15 DEFLECTION BLOCK EXIT EXIT EXIT EXIT ʷ ʝ ʝ ʝ ʧ ʧ...

Page 20: ... W01 ϡ ϡ ϡ ϡ W05 ADJUSTMENT MENU SCREEN WHITE BALANCE BLOCK CUT OFF CUTO DRIVE DRV CUT O DRV W01 W05 EXIT SIGNAL BLOCK WHITE BALANCE BLOCK DEFLECTION BLOCK CONTROL BLOCK BLOCK SELECT SIG W B DEF CNTL EXIT R CUTOFF ӸӸϖ RGB SERV EXIT R DRIVE ϖ R B DISP EXIT DISP EXIT ʷ ʝ ʝ ʝ ʧ ʧ ʧ W01 EXIT ʷ ʝ ʝ ʝ ʧ ʧ ʧ C01 EXIT ʷ ʝ ʝ ʝ ʧ ʧ ʧ D01 DIS P EXIT ʷ ʝ ʝ ʝ ʝ ʧ ʧ ʧ S01 ...

Page 21: ...ASPECT RATIO VERTICAL FREQUENCY CONTENTS INITIAL SETTING VALUE D01 HORIZONTAL POSITION 006 D02 VERTICAL SIZE 060 D03 VERTICAL SIDE PIN CORRECTION 034 D04 VERTICAL CENTER 000 D05 4 3 50Hz VERTICAL LINEARITY 007 DA1 HORIZONTAL POSITION 004 DA2 VERTICAL SIZE 001 DA3 VERTICAL SIDE PIN CORRECTION 002 DA4 VERTICAL CENTER 000 DA5 4 3 60Hz VERTICAL LINEARITY 002 DB1 HORIZONTAL POSITION 000 DB2 VERTICAL SI...

Page 22: ...z 000 C13 VERTICAL DELAY NTSC 001 C14 VERTICAL DELAY PAL 001 C15 VERTICAL DELAY SECAM 004 C16 VERTICAL DELAY BLACK AND WHITE 001 C17 S DELAY NTSC 001 C18 S DELAY PAL 001 C19 S DELAY SECAM 001 C20 S DELAY BLACK AND WHITE 001 C21 BRIGHT VERTICAL 120 C22 SHARP CENTER VALUE 012 C23 V GUARD 001 C24 HOUR METER 001 C25 AFC MODE 000 C26 BURST NTSC PAL 000 C27 BURST SECAM 000 C28 COLOUR SYSTEM 000 C29 REMO...

Page 23: ...0 NTSC 002 C43 TRAP F0 PAL 003 C44 TOF SW NTSC 000 C45 TOF SW PAL 000 C46 TOF Q NTSC 000 C47 TOF Q PAL 000 C48 TOF F0 NTSC 001 C49 TOF F0 PAL 000 C50 APA V NTSC 000 C51 APA V PAL 000 C52 APA V SECAM 000 C53 APA Y C B W 000 C54 R Y BLACK OFFSET 008 C55 B Y BLACK OFFSET 008 C56 CONTRAST CONTROL 002 ...

Page 24: ...ge High voltage meter CRT Anode SCREEN VR Lower knob in FBT 1 Set power supply voltage to AC230VѰ Ѱ Ѱ Ѱ5V TM A101G E AC120VѰ Ѱ Ѱ Ѱ5V TM A101G U 2 Select WHITE BALANCE BLOCK mode from BLOCK SELECT screen 3 Select CUTOFF adjustment mode Low light mode 4 Press SERV switch to display the horizontal line 5 Adjust the SCREEN VR to disappear the horizontal line 6 Connect the high voltage meter to the CRT...

Page 25: ...t to the right direction to bring one of the red green and blue colours faintly visible 7 Then select the CUTOFF switch R G or B that colour except for appears first and adjusting 2 colours CUTOFF values by pressing the key and make horizontal line visible white 8 Readjust the SCREEN VR to appear the horizontal line faintly and cancel the horizontal line to press the SERV switch White Balance High...

Page 26: ...ONTRAST SERVICE MENU 1 Input the full colour bar signal 75 0 75 0 set up level signal 2 Connect the oscillo scope probe to TP 47G and TP E 3 Select the SIGNAL BLOCK mode from BLOCK SELECT screen 4 Select the S02 item 5 Adjust the S02 to become the voltage different between 75 white and 0 black to 30VѰ Ѱ Ѱ Ѱ2Vp p as shown in figure PAL CHROMA Saturation adjustment Signal generator Full colour bar O...

Page 27: ...Select the S04 item 5 Adjust the S04 to become the voltage different between 75 white and blue to 0VѰ Ѱ Ѱ Ѱ2Vp p as shown in figure NTSC 3 58 PHASE adjustment Signal generator Full colour bar Oscillo scope TP 47B TP E CRT SOCKET PWB S06 NTSC PHASE SERVICE MENU 1 Input a NTSC 3 58 full colour bar signal 2 Connect the oscillo scope probe to TP 47B and TP E 3 Select the SIGNAL BLOCK from SERVICE MENU...

Page 28: ... adjustments The other values obtained in the adjustments using other signals become the offset values as opposed to the reference values Item Test equipment Test points Adjustment locations Adjustment procedure H Center H Size Adjustment Signal generator Crosshatch pattern D01 H POSITION SERVICE MENU L502 H SIZE COIL MAIN PWB 1 Input a PAL 50Hz crosshatch pattern signal 2 Select DEFLECTION BLOCK ...

Page 29: ...h pattern D03 V S CR D05 V LIN SERVICE MENU zShould not adjustment except for in case of under the condition that remarkably bad about vertical linearity 11 Input the crosshatch pattern signal 12 Adjust the D03 to the all square in the crosshatch screen become true square 13 Adjust the D05 to the all vertical lines become straight If necessary repeat the above steps DEFLECTION adjustment many time...

Page 30: ...to the center of the screen Fig 3 8 Move the deflection yoke forward and fix the position of the deflection yoke so that the whole screen will become green 9 Insert the wedge to the top side of the deflection yoke so that it will not move 10 Input a crosshatch signal 11 Verify that the screen is horizontal 12 Input red and blue raster signals and make sure that purity is properly adjusted CRT WEDG...

Page 31: ...ke best convergence DYNAMIC CONVERGENCE ADJUSTMENT 1 Move the deflection yoke up and down and overlap the lines in the periphery Fig 2 2 Move the deflection yoke left to right and overlap the lines in the periphery Fig 3 3 Repeat 1 and 2 above and make best convergence ӟ After adjustment fix the wedge at the original position Fasten the retainer screw of the deflection yoke Fix the 6 magnets with ...

Page 32: ...rs and remove the chip part Transistors diodes variable resistors etc 1 Apply extra solder to each lead 2 As shown in the figure push the part with tweezers and alternately melt the solder at each lead Shift and remove the chip part Note After removing the part remove remaining solder from the pattern 2 How to install Chip parts Resistors capacitors etc 1 Apply solder to the pattern as indicated i...

Page 33: ...OTECTOR Quickly 0 1 sec on 0 1 sec off cycles OVER CURRENT PROTECTOR Slowly 1 0 sec on 1 0 sec off cycles SELF DIAGNOSIS FUNCTION mode release Turn the power switch to off or disconnect the power cord from AC outlet In this way not to clear the error counts Reset the error count While entered in this mode press the MENU key CHROMA PHASE key and simultaneously Then clear the error count of the each...

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