JVC AV-21F7(VT) Service Manual

SERVICE MANUAL

COLOUR TELEVISION

BASIC CHASSIS

CG

AV-21F7(VT)

This service manual mainly consists of the following items:

• The items which differ from those for the AV-21FT service manual.

• The initial value for each setting item.
For details other than those described in this manual, please refer to the following service manual.
Reference Service Manual: AV-21FT Service Manual (No. 56003, May 2000)

AV-21F7

AV-21F7

Note: The page in parentheses shows the one for the AV-21FT service manual (No. 56003, May 2000).

HOW TO IDENTIFY MODEL

While referring to the illustration given below, identify model name on the rating label affixed to the rear cover.

Basic model name

AV-21F7

MODEL NO.

XXXXX XXXXXXX
XXXXXXX XXXXX

XXXXXX

XXXXX

XXX XXXXX XXXXX

XXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXX

SERIAL No.

XXXX XX XXXX
XXX XX XXXX

XXXXXX–XXX

Identify model name

AV-21F7-VT

COPYRIGHT  2000 VICTOR COMPANY OF JAPAN, LTD.

No. 56025 1

No. 56025

Jul. 2000

AV-21F7

PARTS DIFFERENCE TABLE

The different parts between AV-21FT and AV-21F7(VT) are described below:

!!

! REF. NO. PART NAME DESCRIPTION

!!

AV-21FT AV-21F7(VT)
PART No. PART No.

■ EXPLODED VIEW PARTS LIST (Page 28)

! V01 A51JSY33X/C/ PICTURE TUBE

A51JSW51X07 PICTURE TUBE ITC type (with DEF YOKE)

! L01 QQW0077-001 CELD029-004J6 DEGAUSSING COIL

DY01 QQD0041-001 DEF YOKE

! T1522 QQH0069-001 QQH0070-001 H.V. TRANSF.

1 LC10394-026A-H LC10394-024A-HK FRONT CABINET

! 15 LC20377-010B-H GG20001-009A-H RATING LABEL

18 A75034-B PC MAGNET
19 CE40764-00A WEDGE ASSY

■ PRINTED WIRING BOARD PARTS LIST (Page 30-)

— SCG-1233A-H2 SCG-1239A-CK MAIN PWB ASS'Y
R1103 NRSA02J-100X CH MG R 10Ω 1/10W J

NRSA02J-820X CH MG R 82Ω 1/10W J

R1112 NRSA02J-100X CH MG R 10Ω 1/10W J

NRSA02J-220X CH MG R 22Ω 1/10W J
R1161 NRSA02J-102X CH MG R 1kΩ 1/10W J
R1162 NRSA02J-122X CH MG R 1.2kΩ 1/10W J
R1163 NRSA02J-222X CH MG R 2.2kΩ 1/10W J
R1164 NRSA02J-221X CH MG R 220Ω 1/10W J
R1165 NRSA02J-220X CH MG R 22Ω 1/10W J
R1166 NRSA02J-821X CH MG R 820Ω 1/10W J
R1345 NRSA02J-151X CH MG R 150Ω 1/10W J
R1346 NRSA02J-151X CH MG R 150Ω 1/10W J
R1348 NRSA02J-472X CH MG R 4.7kΩ 1/10W J
R1349 NRSA02J-472X CH MG R 4.7kΩ 1/10W J
R1351 NRSA02J-151X CH MG R 150Ω 1/10W J
R1352 NRSA02J-151X CH MG R 150Ω 1/10W J
R1369 QRE122J-394 C R 390kΩ 1/2W J
R1528 QRE122J-471 C R 470Ω 1/2W J
R1531 NRSA02J-472X CH MG R 4.7kΩ 1/10W J

NRSA02J-103X CH MG R 10kΩ 1/10W J
R1554 QRE121J-681Y C R 680Ω 1/2W J

QRE122J-821 C R 820Ω 1/2W J
R1904 QRL03EJ-151X OM R 150Ω 3W J
C1161 NCB21HK-103X CH C CAP. 0.01µF 50V K
C1164 NCB21HK-103X CH C CAP. 0.01µF 50V K

No. 560252

AV-21F7

!!

! REF. NO. PART NAME DESCRIPTION

!!

AV-21FT AV-21F7(VT)
PART No. PART No.

■ PRINTED WIRING BOARD PARTS LIST-Continued (Page 30-)

C1165 NCB21HK-103X CH C CAP. 0.01µF 50V K
C1166 NCB21HK-104X CH C CAP. 0.1µF 50V K
C1351 QCZ0121-102 C CAP. 1000pF 3kV Z
C1352 QFZ0097-103 MM CP. 0.01µF 1250V K
C1354 NCS21HJ-271X CH C CAP. 270pF 50V J

NDC21HJ-221X CH C CAP. 220pF 50V J

C1355 NCS21HJ-221X CH C CAP. 220pF 50V J

NDC21HJ-271X CH C CAP. 270pF 50V J

C1356 NCS21HJ-331X CH C CAP. 330pF 50V J

NDC21HJ-331X CH C CAP. 330pF 50V J

C1525 QFZ0200-972 MPP CAP. 9700pF 1.5kVH ±3%

QFZ0200-902 MPP CAP. 9000pF 1.5kVH ±3%

C1527 QFZ0199-274 MPP CAP. 0.27µF 250V J

QFZ0199-304 MPP CAP. 0.3µF 250V J
C1530 QCB32HK-561 C CAP. 560pF 500V K
C1582 QFZ0199-274 MPP CAP. 0.27µF 250V J

QFZ0199-254 MPP CAP. 0.25µF 250V J
C1909 QEZ0476-127 E CAP. 120µF 400V M

QEZ0199-127 E CAP. 120µF 400V M
C1949 NCS21HJ-471X CH C CAP. 470pF 50V J

NDC21HJ-471X CH C CAP. 470pF 50V J
CF1161 SFSH4.5MCB CERAMIC FILTER
L1522 CE41210-00B LIN COIL
L1551 QQLZ018-460 QQLZ018-860 HEATER CHOKE

! T1522 QQH0069-001 QQH0070-001 H.V. TRANSF.

Q1161 2SC2412K/QR/-X CHIP TRANSISTOR
IC1701 MN1873287JA MN1873287JD IC (MICROCOMPUTER)
IC1702 AT24C08-21FTR AT24C08-21F7VT IC (MEMORY) (Service)
J1006 QNN0281-002 PIN JACK

! SK1351 CE42446-001 CE42554-001 CRT SOCKET

TU1001 QAU0185-001 QAU0186-001 AMP TUNER

■ PACKING PARTS LIST (Page 34)

1 GG10056-005A-H GG10007-009A PACKING CASE
2 CM47385-00B-H POS/SERIAL LABEL

CM43936-001 POS/SERIAL LABEL (X2)

5 RM-C364-1H RM-C367-1H REMOCON UNIT

! 7 LCT0748-001A-H LCT0767-001A INST BOOK

(to be continued)

No. 56025 3

AV-21F7

!!

! REF. NO. PART NAME DESCRIPTION

!!

AV-21FT AV-21F7(VT)
PART No. PART No.

■ PACKING PARTS LIST - Continued (Page 34)

! 8 LCT0749-001A-H DIGEST MANUAL

— CEAB005-00AJ1 MATCHING BOX
— CM36447-00A-H ROD ANTENNA

SPECIFICATIONS (Page 2)

Item Content

Dimensions (W × H × D) 619mm × 458mm × 486.5mm
Mass 22kg
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 Frequency PAL (4.43MHz)

SECAM (4.40625MHz / 4.25MHz)
NTSC (3.58MHz / 4.43MHz)

Aerial Input Terminal 75Ω Unbalanced
Power Input Rating: AC120 ~ 240V, 50/60Hz Operating: AC90 ~ 260V, 50/60Hz
Power Consumption 105W (Max.) / 68W (Avg.)
Picture Tube Visible size : 51cm measured diagonally
High Voltage 26.5kV ± 1.5kV (at zero beam current)
Speaker 6cm × 12cm Oval type × 2
Audio Output 5W (Monaural)
Input Video 1Vp-p, 75Ω

Audio 500mVrms (−4dBs), High impedance

Output Video 1Vp-p, 75Ω

Audio 500mVrms (–4dBs), Low impedance

Headphone Jack Stereo mini jack (3.5ø)
Remote Control Unit RM-C367-1H (Battery size : AA/R06/UM-3 × 2)

Design & specifications are subject to change without notice.

No. 560254

SPECIFIC SERVICE INSTRUCTIONS

SETTING OF SYSTEM CONSTANT SET (Page 7)

Table 1

Setting item Setting contents Setting value

AV-21F7

COLOUR MULTI
BILINGUAL NO
TUNER MU
ECO SENSOR YES
LANGUAGE E/V
B/B SOUND OFF

LOCK 180

COLOUR AUTO NO
QSS MINT
ALC NO
TEXT RATE 20
AMP TUNER YES
VNR NO

MULTI. TRIPLE PAL
YES NO
MU MA
YES NO
E/V E
ON OFF

YES 10 20 ... 230

250 240
YES NO
MINT MQSS
YES NO

10 20 40 80

YES NO
YES NO

USER SETTING VALUES (Page 7)

Table 2

Setting item Setting value Setting item Setting value

SUB POWER ON PICTURE MODE (VSM) BRIGHT
CHANNEL POSITION 1 POSITION OFF TIMER OFF

CHANNEL PRESET

VOLUME Appropriate sound volume ECO SENSOR OFF
TV/VIDEO TV BLUE BACK OFF
ON SCREEN DISPLAY POSITION NUMBER DISPLAY ON TIMER PR1 0:00
COLOUR SYSTEM AUTO PAL CHILD LOCK OFF
SOUND SYSTEM B / G PICTURE BOOSTER OFF

Refer to OPERATING
INSTRUCTION

LANGUAGE VIETNAMESE
AUTO SHUTOFF OFF

No. 56025 5

AV-21F7

SERVICE ADJUSTMENTS

■ Initial Setting Value

■ IF CIRCUIT ADJUSTMENT -- Adjustment of DELAY POINT (Page 15)

Setting (Adjustment) Item

DELAY POINT
(AGC TAKE­OVER)

NTSC3.58

Others

Variable Initial setting
range value

48

0 ~ 127

43

■ V/C (VIDEO/CHROMA) CIRCUIT ADJUSTMENT (Page 15)

[SUB MENU 2. V/C]

Colour system Variable Initial setting value

Setting item range PAL SECAM NTSC 3.58 NTSC 4.43

1. CUT OFF (R / G / B) − 128 ~ +127 −50 bbb

2. DRIVE (R / B) −64 ~ +63 0 bbb

3. BRIGHT −128 ~ +127 0 bbb

4. CONT. −64 ~ +63 0 bbb

5. COLOUR (P / S / N3 / N4) −64 ~ +63 0 bbb

6. TINT (N3 / N4) TV / VIDEO −64 ~ +63 0 / 0 0 / 0

7. SECAM BL ADJUST −32 ~ +31 0 bbb

8. SHARP TV / VIDEO −32 ~ +31 −7 / +15 bbb

9. AMP T. SHARP −16 ~ +15 −12 bbb

: Do not adjust.

Adjustment of SUB COLOUR-II (Page 18)

Test point: TP-47R/G and TP-E (") [CRT Socket PWB]

Adjustment part Description

5. COLOUR

PAL COLOUR Value (A) in the figure: Set to +10V (W & G).
SECAM COLOUR Value (A) in the figure: Set to +9V (W & G).
NTSC 3.58 COLOUR Value (A) in the figure: Set to +9V (W & G).

Adjustment of SUB TINT-II (Page 19)

Test point: TP-47R/G and TP-E (") [CRT Socket PWB]

Adjustment part Description

6. TINT
NTSC 3.58 TINT Value (B) in the figure: Set to +7V (W & Cy).

CRT SOCKET PWB
(Within MAIN PWB)

(SOLDER SIDE)

TP-47R/G

TP-47G/R

T

TOP

U

TP-47B

E1

TP-E

No. 560256

■ DEFLECTION CIRCUIT ADJUSTMENT (Page 20)

[SUB MENU 4. DEF]

AV-21F7

Setting item Adjustment name Variable range

1. VER. POSITION Vertical center −4 ~ +3 −1 −3

2. HOR. POSITION Horizontal center −16 ~ +15 +3 +3

3. VER. HEIGHT Vertical height −64 ~ +63 −35 +1

4. VER. LINEARITY Vertical linearity −32 ~ +31 +15 −1

5. VER. SCURVE Vertical scurve −32 ~ +31 −32 0

6. HOR. VCO ADJUST Horizontal VCO −64 ~ +63 0 0

: Do not adjust.

Initial setting value

50Hz 60Hz

■ VSM PRESET ADJUSTMENT (Page 22)

[Setting Values for SUB MENU 4. VSM PRESET]

VSM preset
VSM mode BRIGHT STANDARD SOFT
Setting item

TINT

SETTING VALUE

COLOUR

SETTING VALUE

BRIGHT

SETTING VALUE

CONT.

SETTING VALUE

SHARP

SETTING VALUE

+15

+15

+15

+30 +15 +11

+15

bb

b

bb

bb

b

bb

bb

b

bb

bb

b +12

bb

bb

b

bb

bb

b

bb

bb

b

bb

: Do not adjust.

No. 56025 7

AV-21F7

■ PRESET ADJUSTMENT (Page 23)

[SUB MENU 5. PRESET]

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 b

3. ABL 1 b

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 −3 bbb

24. READ DATA

: Do not adjust.

TV RF system Initial setting value

Setting item B/G I D/K M

10. S.IF DET. LEVEL 0 bbb

14. S.IF BPF BW ADJUST 0 bbb

15. S.IF TRAP FO ADJUST 0 bbb

16. S.IF TRAP FO ADJUST 2 0 bbb

17. S.IF-TRAP 0 bbb

18. S.IF-BPF 0 bb 1

22. S.IF SW 1 bb 0

: Do not adjust.

VICTOR COMPANY OF JAPAN, LIMITED

TELEVISION RECEIVER DIVISION 1106 Heta, Iwai-city, Ibaraki-prefecture, 306-0698, Japan

No. 560258

AV21F7VT-CK #3

CTH 0007
CRT