JVC AV-25LS/C, AV-25LX/C Service Manual

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Page 1

SERVICE MANUAL

COLOUR TELEVISION

AV-25LS AV-25LX

BASIC CHASSIS

POWER

DISPLAY

CHANNEL VOLUME

SYSTEM

SOUND MUTING

COLOUR

TV/VIDEO

123

I/II

456

PICTURE MODE

7809

RETURN

CHANNEL SCAN

-/--

OFF TIMER

TV/TEXT

ECO SENSOR

TEXT

REVEAL HOLD INDEX STORE

MODE SIZE SUBPAGE CANCEL

RM-C352 REMOTE CONTROL UNIT

RM-C352-1C

[AV-25LS

]

AV-25LS AV-25LX

POWER

DISPLAY

CHANNEL VOLUME

SYSTEM

SOUND MUTING

COLOUR

TV/VIDEO

123

456

PICTURE MODE

7809

RETURN

CHANNEL SCAN

-/--

OFF TIMER

ECO SENSOR

RM-C357 REMOTE CONTROL UNIT

RM-C357-1C [AV-25LX/C]

Regarding service information other than these sections, refer to the AV-25LS/AV-25LX service manual (No. 51848). Also, be sure to note important safety precautions provided in the service manual.

a DIFFERENCE TABLE ..............................................................................................................................2

a SERVICE ADJUSTMENTS ......................................................................................................................3

a CIRCUIT DIAGRAMS............................................................................................................................. 10

a PRINTED WIRING BOARD PARTS LIST (AV-25LS/C) .........................................................................18

a PRINTED WIRING BOARD PARTS LIST (AV-25LX/C) .........................................................................23

No. 51848B

Sep. 2001

Page 2

AV-25LS AV-25LX

The following table indicate main different points between models AV-25LS and AV-25LS/C.

ITEM

MASS 30kg 32kg

MODEL

AV-25LS AV-25LS/C

The following table indicate different parts number between models AV-25LS and AV-25LS/C.

EXPLODED VIEW PARTS LIST

! REF. NO.

! V01 PICTURE TUBE A59QDF891X A60LST196X

DY01 DEFLECTION YOKE QQD0062-001 QQD0043-001 18 FRONT CABI GG10133-001B-H GG10133-015A-H

PRINTED WIRING BOARD PARTS LIST

! REF. NO.

PACKING PARTS LIST

! REF. NO.

2 P CASE GG10044-026A-H GG10044-026B-H

ITEM

MAIN PW BOARD ASS’Y SCH-1005A-H2 SCH-1063A-H2

ITEM

MODEL

AV-25LS AV-25LS/C

The following table indicate main different points between models AV-25LX and AV-25LX/C.

ITEM

MASS 30kg 32kg

MODEL

AV-25LX AV-25LX/C

The following table indicate different parts number between models AV-25LX and AV-25LX/C.

EXPLODED VIEW PARTS LIST

! REF. NO.

! V01 PICTURE TUBE A59QDF891X A60LST196X

DY01 DEFLECTION YOKE QQD0062-001 QQD0043-001 18 FRONT CABI GG10133-002A-H GG10133-014A-H

PRINTED WIRING BOARD PARTS LIST

! REF. NO.

PACKING PARTS LIST

! REF. NO.

2 P CASE GG10044-026A-H GG10044-026B-H

ITEM

MAIN PW BOARD ASS’Y SCH-1006A-H2 SCH-1061A-H2

ITEM

MODEL

AV-25LX AV-25LX/C

2 No. 51848B

Page 3

SERVICE ADJUSTMENTS

VC (VIDEO/CHROMA) CIRCUIT ADJUSTMENT

The setting (adjustment) using the remote control unit is made on the basis of the initial setting values. The setting values which adjust the screen to the optimum condition can be different from the initial setting values.

Do not change the initial setting values of the setting (adjustment) items not listed in “ADJUSTMENT”.

•

[SUB MENU 2. VC] : Do not adjust.

AV-25LS AV-25LX

Setting (Adjustment) item Variable range

Initial setting value

PAL SECAM NTSC3.58 NTSC4.43 COMPONENT

1 CUTOFF(R/G) –7 — +8 0

2 DRIVE(R/G/B) –30 — +31 0

3 BRIGHT(COM./TV/V-1/V-2/V-3) –30 — +31 0/–18/0/0/0

4 CONT –30 — +31 –20 —

5 COLOUR –30 — +31 –5 –3 –12 –6 +10

6 TINT (TV/VIDEO) –30 — +31 — — –15/+4 +1/+1 —

7 SHARP (TV/VIDEO) –30 — +31 –16/–2 —/0

8 YDELAY (TV/VIDEO) –8 — +7 0/+1 +5/+1 0/+1 +5/0 —

Item

Adjustment of WHITE

Measuring

instrument

Signal generator

Test point Adjustment part Description

1. CUTOFF (R) CUTOFF (G)

Note:

• Set PICTURE MODE (VSM) to “BRIGHT”.

BALANCE (Low light)

Remote control unit

SCREEN VR [In HVT]

1. Receive a PAL black and white signal (colour off).

2. Select 2. VC from the SERVICE MENU.

3. Select 1. CUTOFF (R) and (G) with MENU &/^ key, and set each value to initial setting value with the 4 and 7 keys, or 5 and 8 keys on

V/C

1. CUTOFF

50 Hz

MENU 89: SELECT

(R) (G)

/+ : OPERATE

PAL

** **

DISPLAY : EXIT

the remote control unit.

4. Press the 1 key on the remote control unit to produce a single hori- zontal line.

5. Turn the SCREEN VR fully counterclockwise, then slowly turn it clockwise to where a red, blue or green colour is faintly visible.

6. Use the keys 4 and 7 or 5 and 8 on the remote control unit and adjust the other 2 colours to where the single horizontal line appears white.

7. Turn the SCREEN VR to where the single horizontal line glows faintly.

8. Press the 2 key to return to 1. CUTOFF screen.

9. Press the DISPLAY key twice to return to the normal screen.

Setting (Adjustment) Variable Initial setting

Item range value

1. CUT OFF

R –7 — +8 0

G –7 — +8 0

H.LINE OFF

H.LINE ON

R. CUTOFF (

REMOTE CONTROL UNIT

12 3

)

G. CUTOFF (8)

R. CUTOFF (

789

)

G.CUTOFF (

)

No. 51848B 3

Page 4

AV-25LS AV-25LX

Item

Adjustment of SUB COLOUR-I

Measuring

instrument

Remote control unit

Test point Adjustment part Description

5. COLOUR

[Method of adjustment without measuring instrument]

Notes:

• Proceed to the following this adjustment after having completed the adjustment of SUB CONT.

• Set PICTURE MODE (VSM) to “BRIGHT”.

– PAL COLOUR –

1. Receive a PAL broadcast.

2. Select 2. VC from the SERVICE MENU.

3. Select 5. COLOUR with the MENU &/^ key.

4. Set the initial setting value for PAL COLOUR with the MENU –/+ key.

5. If the colour is not best with the initial setting value, make fine ad-

justment until you get the best colour.

6. Press the DISPLAY key twice to return to the normal screen.

– SECAM COLOUR –

7. Receive a SECAM broadcast.

8. Press the COLOUR SYSTEM button on the remote control unit to

select the SECAM colour system.

9. Make fine adjustment of SECAM COLOUR in the same way as for

“PAL COLOUR”.

– NTSC 3.58 COLOUR –

10. Receive a NTSC 3.58MHz broadcast.

11. Press the COLOUR SYSTEM button on the remote control unit to

select the NTSC 3.58 colour system.

12. Make similar fine adjustment of NTSC 3.58 COLOUR in the same

way as for “PAL COLOUR”.

– NTSC 4.43 COLOUR –

When adjustment is done for NTSC 3.58 COLOUR, appropriate values are automatically set for NTSC 4.43 COLOUR.

Adjustment of SUB COLOUR-II

Signal generator

Oscilloscope

Remote control unit

TP-47G TP-E (H) [CRT SOCKET PWB]

5. COLOUR [Method of adjustment using measuring instrument]

Notes:

• Proceed to the following this adjustment after having completed the adjustment of SUB CONT.

• Set PICTURE MODE (VSM) to “BRIGHT”.

– PAL COLOUR –

1. Receive a PAL colour bar signal (full field colour bar 75% white).

2. Select 2. VC from the SERVICE MENU.

3. Select 5. COLOUR with the MENU &/^ key.

4. Set the initial setting value of PAL COLOUR with the MENU –/+ key.

5. Connect the oscilloscope between TP-47G and TP-E.

(A)

(–) 0V (+)

Adjust PAL COLOUR to set the value (A) in the figure to +14V (V

W-G

– SECAM COLOUR –

7. Receive a SECAM colour bar signal (full field colour bar 75% white).

8. Press the COLOUR SYSTEM button on the remote control unit to

select the SECAM colour system.

9. Set the initial setting value of SECAM COLOUR with the MENU –/+ key.

10. Adjust SECAM COLOUR to set the value (A) in the figure to –3V

(VW-G).

– NTSC 3.58 COLOUR –

11. Receive a NTSC 3.58 colour bar signal (full field colour bar 75% white).

12. Press the COLOUR SYSTEM button on the remote control unit to

select the NTSC 3.58 colour system.

13. Set the initial setting value of NTSC 3.58 COLOUR with the MENU

–/+ key.

14. Adjust NTSC 3.58 COLOUR to set the value (A) in the figure to

+3V (VW-G).

– NTSC 4.43 COLOUR –

When adjustment is done for NTSC 3.58 COLOUR, appropriate values are automatically set for NTSC 4.43 COLOUR.

4 No. 51848B

Page 5

AV-25LS AV-25LX

Item

Adjustment of SUB TINT-I

Measuring

instrument

Remote control unit

Test point Adjustment part Description

6. TINT [Method of adjustment without measuring instrument]

Notes:

• Proceed to the following this adjustment after having completed the adjustment of SUB CONT.

• Set PICTURE MODE (VSM) to “BRIGHT”.

– NTSC 3.58 TINT –

1. Receive a NTSC 3.58 colour bar signal (full field colour bar 75%

white).

2. Press the COLOUR SYSTEM button on the remote control unit to

select the NTSC 3.58 colour system.

3. Select 2. VC from the SERVICE MENU.

4. Select 6. TINT with the MENU &/^ key.

5. Set the initial setting value of NTSC 3.58 with the MENU –/+ key.

6. If you cannot get the best tint with the initial setting value, make fine

adjustment until you get the best tint.

7. Press the DISPLAY key twice to return to the normal screen.

– NTSC 4.43 TINT –

When adjustment is done for NTSC 3.58 TINT, appropriate values are automatically set for NTSC 4.43 TINT.

Adjustment of SUB SUB TINT-II

Signal generator

Oscilloscope

Remote control unit

(B)

TP-47G TP-E (H) [CRT SOCKET PWB]

6. TINT [Method of adjustment using measuring instrument]

Notes:

• Proceed to the following this adjustment after having completed the adjustment of SUB CONT.

• Set PICTURE MODE (VSM) to “BRIGHT”.

– NTSC 3.58 TINT –

1. Receive a NTSC 3.58 colour bar signal (full field colour bar 75%

white).

2. Press the COLOUR SYSTEM button on the remote control unit to

select the NTSC 3.58 colour system.

3. Select 2. VC from the SERVICE MENU.

4. Select 6. TINT with the MENU &/^ key.

5. Set the initial setting value of NTSC 3.58 with the MENU –/+ key.

6. Connect the oscilloscope between TP-47G and TP-E.

(–) 0V (+)

Adjust NTSC 3.58 TINT to set the value (B) in the figure to +3V (V

8. Press the DISPLAY key twice to return to the normal screen.

– NTSC 4.43 TINT –

When adjustment is done for NTSC 3.58 TINT, appropriate values are automatically set for NTSC 4.43 TINT.

W-cy

No. 51848B 5

Page 6

AV-25LS AV-25LX

DEFLECTION CIRCUIT ADJUSTMENT

Note:

Proceed to the following this adjustment after having completed the adjustments of SUB BRIGHT and SUB CONT.

[SUB MENU 3. DEF]

Setting

(Adjustment)

item

Variable range

50Hz 60Hz

4:3

1. VER. SLOPE –31 — +31 0 0 —— —

2. VER. HEIGHT –31 — +31 +31 +31 0 0 —

3. VER. POSITION –31 — +31 0 0 —— —

4. VER. SCURVE –31 — +31 –21 0 —— —

5. HOR. POSITION –31 — +31 0 0 —— +7

6. HOR. WIDTH –31 — +31 0 0 —— —

7. EW-PIN –31 — +31 0 0 0 0 —

8. EW-TRAPEZ –31 — +31 0 0 —— —

9. UP CORNER –31 — +31 0 0 0 0 —

10. DW CORNER –31 — +31 0 0 0 0 —

11. HOR. PARALL –31 — +31 0 0 —— —

12. HOR. BOW –31 — +31 0 0 —— —

13. V.ZOOM –31 — +31 0 0 0 0 —

Initial setting value

COMPRESS(16:9)

50Hz 60Hz

COMPONENT

DVD(50Hz/60Hz)

[fv : 50Hz mode]

Item

Adjustment of VER. SLOPE

Adjustment of VER.POSITION

Measuring

instrument

Signal generator

Remote control unit

Signal generator

Remote control unit

Test point Adjustment part Description

1. VER. SLOPE 1. Receive a PAL circle pattern signal of vertical frequency 50Hz.

2. Select 3. DEF from the SERVICE MENU.

3. Select 1. VER. SLOPE with the MENU &/^ key.

4. Set the initial setting value of 1. VER. SLOPE with the MENU –/+ key.

5. Adjust 1. VER. SLOPE to make “A = B” with the MENU –/+ key.

Blanking line

3. VER. POSITION 6. Select 3. VER. POSITION with the MENU &/^ key.

7. Set the initial setting value of 3. VER. POSITION with the MENU –/+ key.

8. Adjust 3. VER. POSITION to make “A = B” with the MENU –/+ key.

(to be continued)

6 No. 51848B

Page 7

AV-25LS

Setting item Variable range Initial setting value (fixed)

1. ERROR LIMIT (Do not adjust.) 000H — FF0H 100H

2. A2 ID THR (Do not adjust.) 00H — FFH 0AH

3. SOUND SYSTEM (Do not adjust.) — —

AV-25LX

PRESET ADJUSTMENT

Do not adjust 5. PRESET in the SERVICE MENU as it requires no adjustment.

•

[SUB MENU 5. PRESET]

Setting item Variable range Initial setting value

1 CB 0/1 0 2 ACL 0/1 0 3 MUS 0/1 0 4 MAT 0/1 0 5 FCO 0/1 0 6 BPS 0/1 0 7 IFLH 0/1 0 8 VID 0/1 0 9 STM 0/1 0 10 AFCW 0/1 0 11 VSW 0/1 0 12 FFI 0/1 0 13 AGC 00/10/01 10 14 CL 50 – 95 83 15 AKB 0/1 0 16 HBL 0/1 0 17 BKS 0/1 1 18 READ STATUS —— 19 VNR 00 – 63 25

AUDIO ADJUSTMENT [AV-25LS/C]

Do not adjust 6. AUDIO (1.ERROR LIMIT, 2.A2 ID THR, 3.SOUND SYSTEM) in the SERVICE MENU as it requires no adjustment.

•

[SUB MENU 6. AUDIO]

No. 51848B 7

Page 8

AV-25LS AV-25LX

PURITY AND CONVERGENCE ADJUSTMENTS

Note: The final adjustment of CONVERGENCE must be done after the

FOCUS adjustment. (CONVERGENCE is changed by FOCUS adjustment.) When makes difference by FOCUS adjustment, should be reconfirming PURITY adjustment.

WEDGE

DEFLECTION YOKE

PURITY ADJUSTMENT

1. Demagnetize CRT with the demagnetizer.

2. Loosen the retainer screw of the deflection yoke.

3. Remove the wedges.

4. Input a green raster signal from the signal generator, and turn the screen to green raster.

5. Move the deflection yoke backward.

6. Bring the long lug of the purity magnets on the short lug and position them horizontally. (Fig. 2)

7. Adjust the gap between two lugs so that the GREEN RASTER will come into the centre of the screen. (Fig. 3)

8. Move the deflection yoke forward, and fix the position of the deflection yoke so that the whole screen will become green.

9. Insert the wedge to the top side of the deflection yoke so that it will not move.

10. Input a crosshatch signal.

CRT

4 6

P / C

MAGNETS

• P/C MAGNETS

P : PURITY MAGNET 4 : 4 POLES (convergence magnets) 6 : 6 POLES (convergence magnets)

Fig. 1

PURITY MAGNETS

Long lug

11. Verify that the screen is horizontal.

12. Input red and blue raster signals, and make sure that purity is properly adjusted.

Short lug

(FRONT VIEW)

Bring the long lug over the short lug and position them horizontally.

Fig. 2

GREEN RASTER

CENTRE

Fig. 3

8 No. 51848B

Page 9

STATIC CONVERGENCE ADJUSTMENT

1. Input a crosshatch signal.

2. Using 4-pole convergence magnets, overlap the red and blue lines in the centre of the screen (Fig. 4) and turn them to magenta (red/blue).

3. Using 6-pole convergence magnets, overlap the magenta(red/blue) and green lines in the centre of the screen and turn them to white.

AV-25LS AV-25LX

(FRONT VIEW)

4. Repeat 2 and 3 above, and make best convergence.

DYNAMIC CONVERGENCE ADJUSTMENT

1. Move the deflection yoke up and down to adjust the pin cushion distortion in the screen top and bottom. (Fig. 5)

2. Move the deflection yoke left to right to overlap the lines in the periphery, and match the Yv. (Fig. 6)

3. Using the VR on the deflection yoke, match the YH (CROSS). (Fig. 7 and 9)

4. Repeat the steps 1 and 3 and obtain an optimum convergence.

5. Differential coil ADJUSTMENT. In case where the horizontal lines of red and blue around the centre of both sides of the picture as shown in Fig. 8, adjust the XV difference by using the differential coil on the top of the deflection yoke (Fig. 9) so as to minimize the XV difference.

After adjustment, fix the wedge at the original position.

•

Fasten the retainer screw of the deflection yoke. Fix the 6 magnets with glue.

Fig. 4

(FRONT VIEW)

TOP

BOTTOM

Fig. 5

(FRONT VIEW)

GREEN GREEN

RED

(FRONT VIEW)

BLUE

RED

Fig. 6

GREEN

BLUE

RED

GREEN BLUE

BLUE

GREEN

RED

FRONT

BLUE

RED

BLUE

coil

Fig. 9

(FRONT VIEW)

GREEN

Fig. 7

Fig. 8

RED

GREENGREEN

BLUE

GREEN

No. 51848B 9

Page 10

VICTOR COMPANY OF JAPAN, LIMITED

HOME AV NETWORK BUSINESS UNIT 12, 3-chome, Moriya-cho, kanagawa-ku, Yokohama, kanagawa-prefecture, 221-8528, Japan

AV25LSC-H #4 AV25LXC-H #4

Printed in Japan VP0109 SW

JVC AV-25LS/C, AV-25LX/C Service Manual

CONTENTS

SERVICE ADJUSTMENTS