JVC AV-21PM Service Manual

Text of JVC AV-21PM User Guide:

• JVC AV-21PM, AV-21PM No. 5605526 (FRONT VIEW) RED GREEN BLUE RED BLUE GREEN BLUE RED GREEN GREEN REDBLUE (FRONT VIEW) GREEN BLUE RED RED GREEN BLUE RED GREEN BLUE BLUE GREEN RED (FRONT VIEW) Fig. 1 Fig. 2 Fig. 3 STATIC CONVERGENCE ADJUSTMENT 1. Input a cross-hatch signal. 2. Using 4-pole convergence magnets, overlap the red and blue lines in the center of the screen (Fig. 1) to turn them to magenta (red/blue). 3. Using 6-pole convergence magnets, overlap the magenta (red/ blue) and green lines in the center of the screen to turn them to white. 4. Repeat 2 and 3 above, and make best

• AV-21PM No. 5605510 SERVICE ADJUSTMENTS BEFORE STARTING SERVICE ADJUSTMENT BASIC OPERATION IN SERVICE MENU 1. TOOL OF SERVICE MENU OPERATION Operate the SERVICE MENU with the remote control unit. 2. SERVICE MENU ITEMS With the SERVICE MENU, various settings (adjustments) can be made, and they are broadly classified in the following items of settings: ● 1. IF ............................. Fo

• JVC AV-21PM, AV-21PM No. 56055 15 Measuring Item Test point Adjustment part instrument Adjustment Remote DELAY POINT of DELAY control unit (AGC TAKE-OVER) POINT Description 1. Receive a black and white signal (colour off). 2. Select 1. IF from the SERVICE MENU. 3. Select 2. DELAY POINT by pressing the 2 key on the remote control. 4. Adjust the MENU − or + key until video noise disappears. 5. Press the DISPLAY key three times to return to the normal screen. 6. Turn to other channels and make sure that there are no irregu- larities. V/C (VIDEO/CHROMA) CIRCUIT ADJUSTMENT The setting (adjustment) using the re

• JVC AV-21PM, AV-21PM No. 56055 1 BASIC CHASSIS CG-F SERVICE MANUAL COLOUR TELEVISION AV-21PM AV-21PM COPYRIGHT  2000 VICTOR COMPANY OF JAPAN, LTD. No. 56055 Aug. 2000 CONTENTS ■ SPECIFICATIONS ........................................................................................................................... 2 ■ SAFETY PRECAUTIONS ................................................................................................................ 3 ■ FEATURES ...................................................................................................................................... 4 ★ OPERATING INSTRUCTIONS (APPENDED)...

• AV-21PM No. 56055 23 Measuring Item Test point Adjustment part instrument Description 33. Make sure that the adjustment is properly done on the screen of 60Hz mode. 34. Press the DISPLAY key twice to return to the normal screen. [NOTE] ● When adjust in 60Hz mode, only 60Hz mode is adjust. VSM PRESET ADJUSTMENT Measuring Item Test point Adjustment part inst

• JVC AV-21PM, AV-21PM No. 56055 13 ADJUSTMENT LOCATIONS CRT SOCKET PWB (SOLDER SIDE) U P TP-E( ) TP-47G E CRT EARTH (BRAIDED ASS'Y) TOP F901 PW DEG FRONT CONTROL PWB FRONT POWER SW SL SR 1 Pin TP-91(B1) 2 Pin NC 3 Pin X-RAY1 4 Pin X-RAY2 5 Pin TP-E ( ) MAIN PWB IC702 MEMORY IC IC701 TUNER W HV FRONT AV IN/OUT HVT S1 S1 IC301 U P 1 5 CN002 CN003 W MICRO PROCESSOR CN002 CN003

• JVC AV-21PM, AV-21PM No. 560552 SPECIFICATIONS Item Content Dimensions (W × H × D) 596mm × 468.5mm × 481.5mm Mass 25kg TV RF System B / G, I, D / K, K1, M Colour System TV Mode PAL / SECAM / NTSC3.58 / NTSC4.43 VIDEO Mode PAL / SECAM / NTSC3.58 / NTSC4.43 Receiving Frequency VHF (VL) 46.25MHz ~ 168.25MHz VHF (VH) 175.25MHz ~ 463.25MHz UHF 471.25MHz ~ 863.25MHz CATV ● Cable TVs of Mid (X-Z, S1-S10) Super (S11-S20) & Hyper (S21-S41) bands receivable Intermediate VIF Carrier 38.0MHz Frequency 31.5MHz (6.5MHz) SIF Carrier 32.0MHz (6.0MHz) 32.5MHz (5.5MHz) 33.5MHz (4.5MHz) Colour Sub Carrier Freq

• JVC AV-21PM, AV-21PM No. 56055 7 Setting item Setting contents Setting value COLOUR MULTI BILINGUAL NO TUNER MU ECO SENSOR YES LANGUAGE E/R/A/F B/B SOUND OFF LOCK 180 COLOUR AUTO NO QSS MINT ALC NO TEXT RATE 20 AMP TUNER NO VNR YES EW-PIN IC YES MULTI. TRIPLE PAL YES NO MU MA YES NO E/R/A/F E/A/F E/A E/F ON OFF YES 10 20 ... 230 250 240 YES NO MINT MQSS YES NO 10 20 40 80 YES NO YES NO YES NO Setting item Setting value Setting item Setting value SUB POWER ON PICTURE MODE (VSM) BRIGHT CHANNEL POSITION 1 POSITION VNR OFF OFF TIMER OFF

• JVC AV-21PM, AV-21PM No. 56055 25 PURITY MAGNETS Long lug Short lug Bring the long lug over the short lug and position them horizontally. DEFLECTION YOKE WEDGE CRT P 4 6 P/C MAGNETS • P/C MAGNETS P : PURITY MAGNET 4 : 4 POLES (convergence magnets) 6 : 6 POLES (convergence magnets) GREEN RASTER (FRONT VIEW) CENTER Fig. 1 Fig. 2 Fig. 3 PURITY, CONVERGENCE ADJUSTMENT PURITY ADJUSTMENT 1. Demagnetize CRT with the demagnetizer. 2. Loosen the retainer screw of the deflection yoke. 3. Remove the wedges. (Fig. 1.) 4. Input a green rast

• JVC AV-21PM, AV-21PM No. 560556 REPLACEMENT OF MEMORY IC 1. MEMORY IC This TV uses the following memory IC. Memory IC: IC1702 on MAIN PW Board The memory IC memorizes data for correctly operating the video and deflection circuits. When replacing the memory IC, be sure to use the same type IC written with the initial values of data. In other words, use the specific IC listed in "PRINTED WIRING BOARD PARTS LIST". For its mounting location, re- fer to "ADJUSTMENT LOCATIONS". 2. PROCEDURE FOR REPLACING MEMORY IC (1) Power off Switch the power off and unplug the power cord from the wall outlet. (2) Replacing the memory IC Replace the memory IC with new one. Be sure t

• JVC AV-21PM, AV-21PM No. 56055 19 Measuring Item Test point Adjustment part instrument Adjustment ● Signal TP-47G 6. TINT of generator TP-E ( "" "" ") SUB TINT-II [CRT ● Oscillo- SOCKET NTSC 3.58 TINT scope PWB] ● Remote control unit Adjustment Remote of BLACK control unit OFFSET (SECAM) 7. SECAM BL ADJUST Description [Method of adjustment using measuring instrument] (NTSC 3.58 TINT) 1. Receive a NTSC 3.58 colour bar signal (full field colour bar 75% white). 2. Select 2. V/C from the SERVICE MENU. 3. Select 6. TINT with the MENU a key. 4. Set the initial setting value of NTSC 3.58 with the ME

• JVC AV-21PM, AV-21PM No. 5605522 Measuring Item Test point Adjustment part instrument Adjustment 8. EW-PIN of EW-PIN Adjustment 10. TRAPEZ of TRAPEZ Adjustment 4. VER. LINEARITY of 5. VER. SCURVE V-LINEARITY & V-SCURVE Adjustment 9. EW-CORNER of EW-CORNER Description 18. Select 8. EW-PIN with the MENU a key. 19. Set the initial setting value of 8. EW-PIN with the MENU − / + key. 20. Adjust EW-PIN so that the first vertical lines at the left and right edges on the screen are straight. 21. Select 10. TRAPEZ with the MENU a key. 22. Set the initial setting value of 10. TRAPEZ with the MENU − / + key. 23. Adjust TRAPEZ so that the

• JVC AV-21PM, AV-21PM No. 5605518 Measuring Item Test point Adjustment part instrument Adjustment ● Signal TP-47G 5. COLOUR of SUB generator TP-E ( "" "" ") COLOUR-II [CRT ● Oscillo- SOCKET PAL COLOUR scope PWB] ● Remote control unit SECAM COLOUR NTSC 3.58 COLOUR Adjustment Remote 6. TINT of control unit SUB TINT-I NTSC 3.58 TINT Description [Method of adjustment using measuring instrument] (PAL COLOUR) 1. Receive a PAL full field colour bar signal (75% white). 2. Select 2. V/C from the SERVICE MENU. 3. Select 5. COLOUR with the MENU a key. 4. Set

• JVC AV-21PM, AV-21PM No. 5605524 Colour system Initial setting value Setting item PAL SECAM NTSC 3.58 NTSC 4.43 1. C-TRAP FIX 1 bbb 2. SHARP PEAK 0 bbb 3. ABL 1 bbb 4. GAMMA 0 bbb 5. Y.DELAY TIME TV 0 2 2 3 VIDEO 0 2 0 2 6. BLACK EXP START 3 bbb 7. C-BPF TV 1 b 0 b VIDEO 1 bbb 8. CW/SCP 0 bbb 9. V.IF DET. LEVEL 0 bbb 11. IF AGC MIN. 0 bbb 12. V.IF AGC 0 bbb 13. V.IF PMOD 0 bbb 19. VNR 15 bbb 20. RGB LIM. 1 bbb 21. RGB LIMIT LEVEL 2 bbb 23. TEXT H. POSITION 5 bbb 24. READ DATA PRESET ADJUSTMENT ● No adjustment is necessary. ● Adjust only when you had changed the value by miss operation. [SUB MENU 5. PRESE

• JVC AV-21PM, AV-21PM No. 5605512 SUB MENU SCREEN Fig. 2 SERVICE MENU 1. VCO 2. DELAY POINT 1-2 : SELECT DISP : EXIT IF SUB MENU 1. IF VCO (CW) ✽✽✽.✽✽ MHz TOO HIGH ABOVE REFERENCE JUST REFERENCE BELOW REFERENCE TOO LOW AFT ADJUST ✽✽✽ VCO ADJUST ✽✽✽ FINE DISP : EXIT DELAY POINT AGC TAKE-OVER ✽✽ − / + : OPERATE DISP : EXIT Setting item 1. CUTOFF(R/G/B) 2. DRIVE(R/B) 3. BRIGHT 4. CONT. 5. COLOUR (P / S/ N3 / N4) 6. TINT (N3 / N4) 7. SECAM BL ADJ 8. SHARP (TV / VIDEO) PAL 1. CUTOFF (R) ✽ ✽✽ (G) ✽ ✽✽ − / + : OPERATE DISP : EXIT (B) ✽ ✽✽ a : SELECT V/C SUB MENU 2. V/C − / + : OPERATE DISP : EXIT a

• JVC AV-21PM, AV-21PM No. 5605514 Description 1. Receive a whole black signal. 2. Connect a DC voltmeter between TP-91 (B1) and TP-E (") (between pins 1 and 5 of the connector S1). 3. Make sure that the voltage is DC135.0 ± 1.5V. Description 1. Receive a cross-hatch signal. 2. While watching the screen, adjust the FOCUS VR to make the vertical and horizontal lines as fine and sharp as possible. 3. Make sure that, when the screen is darkened, the lines remain in good focus. ADJUSTMENTS B1 POWER SUPPLY Measuring Item Test point Adjustment part instrum

• JVC AV-21PM, AV-21PM No. 56055 21 Measuring Item Test point Adjustment part instrument Adjustment 3. VER. HEIGHT of V-HEIGHT Adjustment 2. HOR. POSITION of H-POSITION Adjustment 7. HOR. WIDTH of H-WIDTH Description 6. Receive a cross-hatch signal. 7. Select 3. VER. HEIGHT with the MENU a key. 8. Set the initial setting value of 3. VER. HEIGHT with the MENU − / + key. 9. Adjust VER. HEIGHT and make the vertical screen size 91% of the picture size with the MENU − / + key. 10. Receive a circle pattern signal. 11. Select 2. HOR. POSITION with the MENU a key. 12. Set the initial

• JVC AV-21PM, AV-21PM No. 56055 27 SELF-CHECK FUNCTIONS 1. Outline This model has self-check functions given below. When an abnormality has been detected, the SUB POWER is turned off and both POWER and ON TIMER LEDs flash to inform of the failure. An abnormality is detected by the signal input state of the control line connected to the microcomputer. 2. Self-check items 3. Self-check indicating function When an abnormality has been detected at about 3 seconds after the power is turned on, the SUB POWER is turned off immediately and the POWER and ON TIMER LEDs flash. [ Indication by the LED ]

• JVC AV-21PM, AV-21PM No. 560558 Service menu Setting item 5. PRESET 1. C-TRAP FIX 2. SHARP PEAK 3. ABL 4. GAMMA 5. Y.DELAY TIME 6. BLACK EXP START 7. C-BPF 8. CW/SCP 9. V.IF DET. LEVEL 10. S.IF DET. LEVEL 11. IF AGC MIN. 12. V.IF AGC 13. V.IF PMOD 14. S.IF BPF BW ADJUST 15. S.IF TRAP FO ADJUST 16. S.IF TRAP FO ADJUST 2 17. S.IF-TRAP 18. S.IF-BPF 19. VNR 20. RGB LIM. 21. RGB LIMIT LEVEL 22. S.IF SW 23. TEXT H. POSITION 24. READ DATA 6. TURBO TIMER ON/OFF Should be set to OFF. (When you turn the TV power off, the Turbo Timer is automatically set to OFF.) Service menu Setting item 1. IF 1. VCO 2. DELAY POINT 2. V / C 1. CUTOFF(R/G/B) 2. DRIVE(R/B) 3. BRIGHT 4. CONT. 5. COL

• AV-21PM No. 5605516 Measuring Item Test point Adjustment part instrument Adjustment ● Signal 1. CUTOFF (R) of WHITE generator CUTOFF (G) BALANCE CUTOFF (B) (Low light) ● Remote control SCREEN VR unit (In HVT) Adjustment ● Signal 2. DRIVE (R) of WHITE generator DRIVE (B) BALANCE (High light) ● Remote control unit Description 1. Re

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JVC AV-21PM Remote control manual 29-11-2022 1

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