JVC AV-21AT User manual

AV-21AT

No. 56013B 1

BASIC CHASSIS

SERVICE MANUAL

COLOUR TELEVISION

AV-21AT(B)

AV-21AT

Nov. 2000

HOW TO IDENTIFY MODEL

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

This service manual mainly consists of the following items:

• The items which differ from those for the AV-21AT 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-21AT Service Manual (No. 56013, May 2000)

Note: The page in parentheses shows the one for the AV-21AT service manual (No. 56013, May 2000).

MODEL NO.

XXXXX XXXXXXX

XXXXXXX XXXXX

XXXXXX

XXXXX

XXX XXXXX XXXXX

XXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXX

SERIALNo.

XXXXXX–XXX

XXXX XX XXXX

XXX XX XXXX

Identify model name

Basic model name

AV-21AT

AV-21AT/B

AV-21AT

No. 56013B2

AV-21AT AV-21AT(B)

!REF. NO. PART NAME DESCRIPTION

PART No. PART No.

■EXPLODED VIEW PARTS LIST (Page 28)

!V01 A51LMV20X PICTURE TUBE

A51JSY63X15/CM/ PICTURE TUBE ITC Type

DY01 CE20336-00A DEF YOKE

!L01 QQW0006-001 QQW0077-001 DEGAUSSING COIL

8 CE42153-00AJ1 WEDGE ASSY (x4)

9 A75034-B PC MAGNET or CE42378-00B

— LC40312-011A-H RUBBER WASHER (x6)

— CHGG0021-0A-G CONNECTOR ASSY

—LC30601-001A DEG HOLDER

■PRINTED WIRING BOARD PARTS LIST (Page 30-)

— SCG-1247A-H2 SCG-1272A-H2 MAIN PWB ASSY

R1904 QRL03EJ-151X OM R 150Ω3W J

C1525 QFZ0200-103 MPP CAP. 0.01µF 1.5kVH ±3%

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

C1527 QFZ0199-224 MPP CAP. 0.22µF 250V J

QFZ0199-274 MPP CAP. 0.27µF 250V J

C1582 QFZ0199-224 MPP CAP. 0.22µF 250V J

QFZ0199-204 MPP CAP. 0.2µF 250V J

L1551 QQLZ018-430 QQLZ018-460 HEATER CHOKE

PARTS DIFFERENCE TABLE

The different parts between AV-21AT and AV-21AT(B) are described below:

AV-21AT

No. 56013B 3

SPECIFICATIONS(Page 2)

Item Content

Dimensions (W ×H ×D) 502mm ×451mm ×480.5mm

Mass 19.5kg

TV RF System B / G, I, D / K, K1

Colour System TV Mode PAL / SECAM

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 75ΩUnbalanced

Power Input AC110 ~ 240V, 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 5cm ×9 cm 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-C364-1H (Battery size : AA/R06/UM-3 ×2)

Design & specifications are subject to change without notice.

AV-21AT

No. 56013B4

SETTING OF SYSTEM CONSTANT SET (Page 7)

Table 1

USER SETTING VALUES (Page 7)

Table 2

SPECIFIC SERVICE INSTRUCTIONS

Setting item Setting value Setting item Setting value

SUB POWER ON PICTURE MODE (VSM) BRIGHT

CHANNEL POSITION 1 POSITION VNR OFF

OFF TIMER OFF

LANGUAGE ENGLISH

VOLUME Appropriate sound volume AUTO SHUTOFF OFF

TV/VIDEO TV ECO SENSOR OFF

ON SCREEN DISPLAY POSITION NUMBER DISPLAY BLUE BACK OFF

COLOUR SYSTEM AUTO PAL ON TIMER PR1 0:00

SOUND SYSTEM B / G CHILD LOCK OFF

Refer to OPERATING

INSTRUCTION

CHANNEL PRESET

Setting item Setting contents Setting value

COLOUR TRIPLE

BILINGUAL NO

TUNER MU

ECO SENSOR YES

LANGUAGE E/R/C

B/B SOUND OFF

LOCK 180

COLOUR AUTO NO

QSS MINT

ALC NO

TEXT RATE 20

AMP TUNER NO

VNR YES

EW-PIN IC NO

MULTI. TRIPLE PAL

YES NO

MU MA

YES NO

E/R/C/U E/R/C E/R/U E/C

ON OFF

YES 10 20 ... 230

250 240

YES NO

MINT MQSS

YES NO

10 20 40 80

YES NO

AV-21AT

No. 56013B 5

SERVICE ADJUSTMENTS

■Initial Setting Value

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

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

[SUB MENU 2. V/C]

Adjustment of SUB COLOUR-II (Page 18)

Adjustment of SUB TINT-II (Page 19)

Adjustment part Description

5. COLOUR

PAL COLOUR Value (A) in the figure: Set to +6V (W & G).

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

NTSC 3.58 COLOUR Value (A) in the figure: Set to +2V (W & G).

Adjustment part Description

6. TINT

NTSC 3.58 TINT Value (B) in the figure: Set to +2V (W & Cy).

Variable Initial setting

range value

Setting (Adjustment) Item

DELAY POINT

(AGC TAKE-OVER) 0~127 43

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 −5 / +15 bbb

: Do not adjust.

AV-21AT

No. 56013B6

■DEFLECTION CIRCUIT ADJUSTMENT (Page 20)

: Do not adjust.

■VSM PRESET ADJUSTMENT (Page 22)

VSM preset

VSM mode BRIGHT STANDARD SOFT

Setting item

TINT +15 bb

bbb

SETTING VALUE

COLOUR +15 bb

bbb

SETTING VALUE

BRIGHT +15 bb

bbb

SETTING VALUE

CONT. +30 +15 +11

SETTING VALUE

SHARP +15 +15 +12

SETTING VALUE

[Setting Values for SUB MENU 4. VSM PRESET]

Initial setting value

Setting item Adjustment name Variable range 50Hz 60Hz

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.

[SUB MENU 3. DEF]

AV-21AT

No. 56013B 7

■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 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 b0 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 −3bbb

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.

AV-21AT

No. 56013B8 CTH 0011

CRT

AV21ATB-H #3

VICTOR COMPANY OF JAPAN, LIMITED

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

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