JVC TV-20242 Service Manual

SERVICE MANUAL

TV/VCR COMBO

TV-20242

supplementar

TV-20242

BASIC CHASSIS

FC3

The following item for the TV-20242 model were changed from those of the TV-20240 Therefore, this service manual describes only the items which differ from those of the TV-20240 service manual. For details other than those described in this manual, please refer to the service manual table given below.

■ REFERENCE SERVICE MANUAL TABLE

MODEL No. CHASSIS No. MANUAL No. & DATE DESCRIPTION

TV-20240(US/CA) F C No.51520,Mar.1999 Basic model. TV-20240(US/CA) F C No.51520B,Nou.1999

TV-20240(A US/A CA) F C No.51520C,Nou 1999 TV-20241(US/CA) F C 2 No.51688,Jan.2000 V-chip & RETURN+ functions are added.

TV-20242 F C 3 No.51820,May.2001

Supplementary Change of VCR mechanism section. Supplementary Change of production country

SYSTEM CONSTANT MODE is added & cabinet color is changed.

(US/CA)

model.

(US/CA)

■ OUTLINE OF TV-20242 MODEL

This is an improved version of the TV-20240(US/CA) model to which SYSTEM CONSTANT MODE (CAN V-chip) is added and CABINET color is changed.

No.51820

May. 2001

May 2001

TV-20242

SYSTEM CONSTANT check and setting are added.[2.(4)]

MEMORY IC REPLACEMENT

1. Memory IC

This model uses a memory IC. This memory IC stores data for proper operation of the video and deflection circuits. When replacing, be sure to use an IC containing this (initial value) data.

2. Memory IC replacement procedure

(1) Power off

Switch off the power and disconnect the power cord from the wall outlet.

(2) Replace the memory IC

Initial value must be entered into the new IC.

(3) Power on

Connect the power cord to the wall outlet and switch on the power.

(4) System constant check and setting

It must not be adjusted without signal.

****

1) Press

SLEEP TIMER

MIN.

” is being displayed, press

key and, while the indication of “

DISPLAY

key and

on the remote control unit simultaneously.

2) The SERVICE MENU screen of Fig.1 is displayed.

3) While the SERVICE MENU is displayed, again simultaneously press

DISPLAY

the

VIDEO STATUS

and

keys to display the Fig.2 SYSTEM

CONSTANT screen.

4) Refer to the SYSTEM CONSTANT screen and check the setting items. Where these differ, select the setting item with the MENU UP/DOWN key and adjust the setting with the MENU LEFT/RIGHT keys. (The letters of the selected item are displayed in yellow.)

5) After adjusting, release the MENU LEFT/RIGHT key to store the setting value.

6) Press the

EXIT

key twice to return to the normal screen.

SLEEP TIMER 0

VIDEO STATUS

key

SERVICE MENU

SERVICE MENU PICTURE SOUND

VIDEO STATUS OTHERS LOW LIGHT HIGH LIGHT RF AFC I2C BUS CTRL

SELECT BY OPERATE BY EXIT BY

EX IT

Fig.1

SYSTEM CONSTANT

V-CHIP : YES CAN V-CHIP : YES

***

MN1876476

SELECT BY OPERATE BY EXIT BY

***

******

Fig.2

NAME OF REMOTE CONTROL KEY

(5) Receive channel setting

Refer to the OPERATING INSTRUCTIONS (USER'S GUIDE) and set the receive channels (Channels Preset) as described.

(6) User settings

Check the user setting items according to Table 1.(page8 on AV-20240) Where these do not agree, refer to the OPERATING INSTRUCTIONS (USER'S GUIDE) and set the items as described.

(7) SERVICE MENU setting

Verify what to set in the SERVICE MENU, and set whatever is necessary. (Fig.1) Refer to the SERVICE ADJUSTMENT for setting.

No. 51820

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