JVC AV-25P8VT Service Manual

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Page 1

SERVICE MANUAL

COLOUR TELEVISION

BASIC CHASSIS

AV-25P8(VT)

This service manual mainly consists of the following items:

• The items which differ from those for the AV-25PX 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-25PX Service Manual (No. 51752, Aug. 2000)

AV-25P8

Note: The page in parentheses shows the one for the AV-25PX service manual (No. 51752, Aug. 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-25P8

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-25P8-VT

No. 56069 1

No. 56069 Sep. 2000

Page 2

AV-25P8

PARTS DIFFERENCE TABLE

The different parts between AV-25PX and AV-25P8(VT) are described below:

! REF. NO. PART NAME DESCRIPTION

AV-25PX AV-25P8(VT) PART No. PART No.

■ EXPLODED VIEW PARTS LIST (Pages 35 and 36)

! 12 LC10477-003A-H LC10477-003A-HK REAR COVER ! 14 LC20377-010B-H GG20001-019A-H RATING LABEL

25 LC10475-013A-H LC10475-015A-HK FRONT CABI ASSY

■ PRINTED WIRING BOARD PARTS LIST [MAIN PWB ASSY] (Page 38-)

— SJK-1006A-H2 SJK-1029A-CK MAIN PWB ASSY IC1701 M37280MF-173SP M37280MF-201SP IC (MICROCOMPUTER) IC1702 AT24C16-29RSB AT24C16-29R9BBK IC (MEMORY) (Service)

■ PRINTED WIRING BOARD PARTS LIST [POWER & DEF PWB ASSY] (Page 41-)

— SJK-2004A-H2 SJK-2012A-CK POWER & DEF PWB ASSY

■ PRINTED WIRING BOARD PARTS LIST [CRT SOCKET PWB ASSY] (Page 43)

— SJK-3002A-H2 SJK-3005A-CK CRT SOCKET PWB ASSY

■ PRINTED WIRING BOARD PARTS LIST [FRONT CONTROL PWB ASSY] (Page 44)

— SJK-8003A-H2 SJK-8009A-CK FRONT CONTROL PWB

ASSY

■ PRINTED WIRING BOARD PARTS LIST [AV SEL. PWB ASSY] (Page 45-)

— SJK0S006A-H2 SJK0S009A-CK AV SEL. PWB ASSY

■ PACKING PARTS LIST (Page 47)

1 LC10845-003A-H GG10078-002A PACKING CASE

! 6 LCT0864-001A-H LCT0851-001A INST BOOK

7 CM47385-00B-H CM43936-001 POS/SERIAL LABEL (×2)

! 8 LCT0662-001A-H DIGEST MANUAL ! 9 LCT0661-001A-H DIGEST MANUAL

— CEAB005-00AJ1 MATCHING BOX

No. 560692

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SPECIFICATIONS (Page 2)

Item CONTENTS

Dimensions (W × H × D) 655mm × 530.5mm × 465mm Mass 36kg TV RF System B, G, I, D, K, K1, M Colour System PAL, SECAM, NTSC3.58, NTSC4.43 Receiving Frequency VHF (L) 46.25MHz ~ 168.25MHz

VHF (H) 175.25MHz ~ 463.25MHz UHF 471.25MHz ~ 863.25MHz CATV Mid (X-Z, S1-S10), Super (S11-S20), Hyper (S21-S41) bands receivable

Intermediate Frequency

VIF Carrier 38.0MHz SIF Carrier 33.5MHz(4.5MHz), 32.5MHz(5.5MHz), 32.0MHz(6.0MHz), 31.5MHz(6.5MHz)

Colour Sub Carrier Frequency

PAL 4.43MHz SECAM 4.40625MHz, 4.25MHz

NTSC 3.58MHz / 4.43MHz Power Input Rating: AC110 ~ 240V, 50/60Hz Operating: AC90 ~ 260V, 50/60Hz Power Consumption 181W (Max.), 119W (Avg.) Picture Tube Visible size : 60cm measured diagonally High Voltage 31.0kV ±1.5kV (at zero beam current) Speaker & Audio Output Open dome speaker

10W+10W, 10cm round x 2

Video Audio Input terminals

Video1 S-Video Y: 1Vp-p Positive (Negative sync provided, when terminated with 75Ω)

C: 0.286Vp-p (Burst signal, when terminated with 75Ω)

Video 1Vp-p 75Ω (RCA pin jack)

Audio (L/R) 500mVrms (−4dBs), High impedance (RCA pin jack) Video2 Video 1Vp-p 75Ω (RCA pin jack)

Audio (L/R) 500mVrms (–4dBs), High impedance (RCA pin jack) Video3 Video/Y Composite video 1Vp-p 75Ω (RCA pin jack)

Component video 1Vp-p 75Ω (RCA pin jack)

Cb Component video B-Y 0.7Vp-p 75Ω (RCA pin jack)

Cr Component video R-Y 0.7Vp-p 75Ω (RCA pin jack)

Audio (L/R) 500mVrms (–4dBs), High impedance (RCA pin jack) Video4 Video 1Vp-p 75Ω (RCA pin jack)

Audio (L/R) 500mVrms (−4dBs), High impedance (RCA pin jack) Video Audio Output terminal

Video 1Vp-p 75Ω (RCA pin jack)

Audio (L/R) 500mVrms (−4dBs), High impedance (RCA pin jack) Aerial Input Terminal 75Ω Unbalanced, Coaxial Headphone Jack Stereo mini jack (3.5ø) AV Compu Link terminal AV Compu Link II, mini jack (3.5ø) Remote Control Unit RM-C113 (AA/R06 / UM-3 dry battery × 2)

AV-25P8

Design & specifications are subject to change without notice.

No. 56069 3

Page 4

AV-25P8

SPECIFIC SERVICE INSTRUCTIONS

SETTING OF SYSTEM CONSTANT SET (Page 9)

Table 1

CONTENTS VARIABLE RANGE INITIAL SETTING VALUE

COLOUR MULTI MSP NO SUPER BASS NO CENTER SPEAKER NO TEXT NO BLUE BACK MUTE NO VOLUME LIMIT YES COLOUR AUTO NO TILT YES C-TRAP 1 E.M.C. NO N/S WHITE BACK NO 7 LED SPEED 00

MULTI TRIPLE PAL YES NO YES NO YES NO YES NO YES NO YES NO YES NO YES NO 1 0 YES NO

YES NO 00 10 20 ... 1250

1270 1260

LANGUAGE E/V

E/V E

USER SETTING CONDITIONS (Page 9)

Table 2

PICTURE SETTING FEATURES

PICTURE MODE BRIGHT SLEEP TIMER OFF CONTRAST CENTER ON TIMER PR1 0:00 BRIGHT CENTER BLUE BACK ON SHARP CENTER CHILD LOCK OFF COLOUR CENTER CHANNEL GUARD -TINT CENTER AUTO SHUT OFF OFF WHITE BALANCE COOL VIDEO-3 SETTING COMPONENT

PICTURE FEATURES INSTALL

A.A.C ON LANGUAGE ENGLISH AUTO VNR AUTO AUTO PROGRAM -COLOUR SYSTEM TV: According to preset CH EDIT / MANUAL PRESET CH only

VIDEO: AUTO PAL Others: blank ZOOM REGULAR DEMO ECO SENSOR OFF DEMO OFF PICTURE TILT CENTER OTHERS

SOUND SETTING VOLUME Appropriate sound level BASS CENTER CHANNEL PRESET Refer to Operating Instructions. TREBLE CENTER CHANNEL POSITION 1 POSITION BALANCE CENTER SUB POWER ON AI VOLUME ON ON SCREEN DISPLAY POSITION INDICATION BBE ON TV/VIDEO TV SPATIALIZER OFF SOUND SYSTEM B/G

No. 560694

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SERVICE ADJUSTMENTS

■ Initial Setting Value

■ SETTING OF VSM PRESET (Page 18)

[INITIAL SETTING VALUES OF VSM PRESET (SUB MENU 5. VSM PRESET)]

PICTURE MODE BRIGHT STANDARD SOFT ITEM

1. BRIGHT +0 +0 +0

2. CONT +17 +0 −4

3. COLOR +0 +0 − 1

4. SHARP +0 +0 −3

5. TINT +0 +0 +0

: Do not adjust.

AV-25P8

■ SETTING OF WHITE BALANCE PRESET (Page 19)

[SETTING OF WHITE BALANCE PRESET (SUB MENU 6. WB PRESET)]

WHITE BALANCE ITEM

1. R DRIVE 0 −3 +26

2. B DRIVE 0 −23 −27

: Do not adjust.

COOL MID WARM

No. 56069 5

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AV-25P8

■ VIDEO / CHROMA CIRCUIT ADJUSTMENT (Page 19)

CONTENTS PAL SECAM NTSC 3.58 NTSC 4.43

R −60

1. CUTOFF G −60

B −60

2. DRIVE R +0

B +0

3. BRIGHT TV 000—

VIDEO +1 −4 −2—

COMPONENT −3

4. CONT TV 000—

VIDEO +20+2—

COMPONENT +2

5. COLOUR TV / VIDEO +10 +18 +0 −2

COMPONENT +8 +18

6. TINT TV +6 +6 −10

VIDEO +6 +6 +60

COMPONENT +6 −3

7. BLACK OFFSET R-Y —0——

B-Y —0——

8. SHARP TV −15 −17 −15 —

VIDEO −13 −11 −12 —

COMPONENT −15

: Do not adjust.

Adjustment of SUB COLOUR-II (Page 22)

Adjustment part Description

5. COLOUR

PAL COLOUR Value (A) in the figure: Set to 0V (W & G). SECAM COLOUR Value (A) in the figure: Set to −5V (W & G). NTSC 3.58 COLOUR Value (A) in the figure: Set to +6V (W & G).

Adjustment of SUB TINT-II (Page 23)

Adjustment part Description

6. TINT

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

No. 560696

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AV-25P8

■ DEFLECTION CIRCUIT ADJUSTMENT (Page 25)

[DEFLECTION ADJUSTMENTS INITIAL SETTING VALUE (SUB MENU 4. DEF)]

Initial setting value

Setting item Adjustment name REGULAR ZOOM 16:9

50Hz 60Hz 50Hz 60Hz 50Hz 60Hz

1. V-SHIFT Vertical shift −30+10−10

2. V-SIZE Vertical size +13 0 +36 +35 −37 −37

3. SUBTITLE Subtitle 0 +10+70 0

4. H-CENT Horizontal center −9 +5 −1 −10 0

5. H-SIZE Horizontal size +11 −1 −9 −7 −10

6. EW-PIN Side pin correction −1 −1 −4 −5 +2 +1

7. TRAPEZ Trapezoidal distortion correction +4 −10 0−1+1

8. EW.COR.L Corner pin correction Low side −20 0 0+1+1

9. EW.COR.H Corner pin correction High side −20 0 0+1+1

10. V.S-COR Vertical size correction +900000

11. V-LIN Vertical Linearity 0 0 +1000

12. H-BLK-R Horizontal Blanking Right 0 0 0 0 +29 0

13. H-BLK-L Horizontal Blanking Left 0 0 0000

14. V-EHT V size correction level caused by EHT change −400000

15. H-EHT H size correction level caused by EHT change −400000

16. EHT-GAIN Size correction gain caused by EHT change 0 0 0000

: Do not adjust.

■ AUDIO CIRCUIT ADJUSTMENT (Page 29)

[AUDIO ADJUSTMENTS INITIAL SETTING VALUE (SUB MENU 3. AUDIO)]

Setting item Variable range Fixed value

1. ERROR LIMIT 000H ~ FF0H 100H

2. A2 ID THR 00H ~ FFH 14H

3. BASS −17 ~ +17 +0

4. TREBLE −17 ~ +17 +0

: Do not adjust.

No. 56069 7

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AV-25P8

VICTOR COMPANY OF JAPAN, LIMITED

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

No. 560698

AV25P8VT-CK #3

CTH 0009 CRT