JVC AV-21AT User manual

AV-21AT
No. 56013B 1
BASIC CHASSIS
CG
SERVICE MANUAL
COLOUR TELEVISION
AV-21AT(B)
AV-21AT
COPYRIGHT  2000 VICTOR COMPANY OF JAPAN, LTD. No. 56013B
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
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
YES NO
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
bb
bbb
bb
b
SETTING VALUE
COLOUR +15 bb
bb
bbb
bb
b
SETTING VALUE
BRIGHT +15 bb
bb
bbb
bb
b
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