JVC AV-48WP74/HA, AV-56WP74/HA Service Manual

SERVICE MANUAL

REAR PROJECTION TELEVISION

AV-48WP74 AV-56WP74

BASIC CHASSIS

SB3

AV-48WP74

/HA

AV-56WP74 /HA

Supplementary

Since some details of the AV-48WP74/HA / AV-56WP74/HA service manual (No.52105 2003/4) were

incorrect , We are informing you of these errors and of the new correct descriptions.

ADDITION ITEM

The adjustment performed using test mode is added. For this reason, the item of “HOW TO ENTER THE TEST MODE” was described below.

1) HOW TO ENTER TEST MODE

Press [SLEEP TIMER] key and set SLEEP TIMER 30 MIN.

While the indication of SLEEP TIMER 30 MIN. is being displayed, press [DISPLY] key and [VIDEO STATUS] key. The TEST MODE screen is displayed. (Fig. 1)

3. Press [5] key and enter the 5.CONVER OFF. (Fig. 2)

4. Press [INPUT] key and select the cross-hatch pattern. (Fig. 3)

NOTE : For this adjustment, it is necessary to use

a remote control unit (e.g. RM-C322G) with

[INPUT] key.

TEST MODE

1. I2C STOP

2. STATUS DISP.

4. SELF-CHK

5. CONVER OFF

ROM CORRECTION : ACT ROM VERSION :

Fig. 2 Fig. 3

*******

Fig. 1

No.52105C

2003/10

AV-48WP74 AV-56WP74

CORRECT ITEM

1) 2.9.3 SERVICE ADJUSTMENT ITEM (Page.1-18)

8.PP

Multi-picture adjustment and

ADM001~ADM034 Do not adjust

setting

2) 3.4 ADJUSTMENT LOCATION (1/2) (Page.1-22)

MAIN PWB

RECEIVER PWB

CONVERGENCE

DELETION

OUT PWB

Incorrect

Correct

Incorrect

Correct

SUB TUNER

(TU101)

MAIN TUNER

(TU0102)

MAIN TUNER

SUB TUNER

(TU1101)

SPEAKER

AUDIO IN

DIGITAL INPUT MODULE PWB

G CRT

SOCKET

PWB

AUDIO / VIDEO

S-VIDEO

3) 3.8.2 HORIZONTAL FREQUENCY ADJUSTMENT (Page 1-46)

Item

H. FREQUENCY adjustment

Measuring instrument

Signal generator

Remote

Test point Adjustment part Description

[1.PICTURE/SOUND]

D15 : H. FREQ. D19 : DEF. RST

control unit

Incorrect <D19>

Correct <D18>

(1) Receive any broadcast. (2) Press [ASPECT] key and select FULL mode. (3) Select 1. PICTURE/SOUND from SERVICE MENU. (4) Select <D19> (DEF. RST) and change the data 0 to 1. (5) While observing the screen, adjust the <D15> (H.

FREQ) so that an optimum horizontal synchronization is obtained.

(6) After adjustment, select <D19> and change the data 1

to 0.

(7) Press [MUTING] key to memorize the set value.

MI-COM&DIST MODULE PWB

CN00Y

CN00E

DIGITAL INPUT MODULE PWB

COMPONENT

VIDEO-V

AUDIO

(No. 52105C)

4) 3.8.3 FOCUS & BEAM SPOT ADJUSTMENT (Page 1-47)

Incorrect Correct

CRT FOCUS adjustment point CRT FOCUS adjustment point

5) 3.8.4.2 PREPARATION (Page 1-49)

AV-48WP74 AV-56WP74

Item

SCREEN TILT adjustment

1.PICTURE/SOUND menu

* * * * * * * *

Measuring

instrument

Signal generator

Remote control unit

F62 0

Select item

Test point Adjustment part Description

[1.PICTURE/SOUND]

F62 : Without

convergence 0peration

G DEF. YOKE R DEF. YOKE B DEF. YOKE [PROJECTION UNIT]

Change value

0 1

Confirm correct FOCUS adjustment. (1) Receive NTSC cross-hatch signal. (2) Select 1. PICTURE/SOUND from SERVICE MENU. (3) Select <F62> (Without convergence operation) with [CH +] /

[CH -] key

(4) Change the data 0 to 1, then it makes picture without

convergence operation. (5) Makes a green single color. NOTE : When making a single color, It squeezes SCREEN VR in each one, or it does a lid to the lens in the adjustment color and it makes it single color. (6) Temporarily secure the G deflection yoke to the top of the

neck and adjust the tilt of the deflection yoke so that the horizontal line at the center becomes flat. After adjustment, fasten the temporal screw.

(7) Adjust the tilt of the R and B deflection yokes in the same

manner as for green. NOTE : Make sure that the adjustment of CRT FOCUS is optimized at the center and at the fringe of the center in turn. If the proper adjustment has not been done, adjust FOCUS VR again.

Adjustment according to an internal signal using TEST MODE is also possible. (TEST MODE : Refer to top page)

ADDITION

(No. 52105C)

+ 5 hidden pages