JVC AV-20420, AV-20421, Руководство по обслуживанию

Страница: 8 / 32

AV-20420
AV-20421
1-8 (No.52111)
2.5 REPLACEMENT OF MEMORY IC
2.5.1 MEMORY IC
This TV use memory IC.
In the memory IC, there are memorized data for correctly operating the video and deflection circuits.
When replacing the memory IC, be sure to use IC written with the initial values of data.
2.5.2 PROCEDURE FOR REPLACING MEMORY IC
(1) Power off
Switch the power off and unplug the power plug.
(2) Replace IC
Be sure to use a memory IC written with the initial setting data.
(3) Power on
Connect the power plug and switch the power on.
(4) Setting of receive channels
Set the receive channels. For setting, refer to the OPERATING INSTRUCTIONS.
(5) User settings
Check the user setting items according to TABLE “USER SETTING VALUE”, and if these are different, set the correct value.
(6) CHECK THE SYSTEM CONSTANT ITEMS
If the value of each item of a system setup is not correctly set
as a value peculiar to this television, operation of a
microcomputer and the output of an image do not become
suitable. Please set up the value of each item correctly,
according to the following description.
(1) Press the [SLEEP TIMER] key, and while the indication
of “SLEEP TIMER 0 MIN” is being displayed, press
[DISPLAY] key and [VIDEO STATUS] key on the remote
control unit simultaneously (Fig.1).
(2) The SERVICE MENU screen of Fig.1 will be displayed.
(3) While the SERVICE MENU is displayed, again
simultaneously press the [DISPLAY] and [VIDEO
STATUS] keys to display the SYSTEM CONSTANT
screen (Fig.2).
(4) Refer to the Table 1 of SYSTEM CONSTANT SETTING,
and check the setting items. Where these differ, select
the item with the [CH (-/+)] key and adjust it with the [VOL
(-/+)] keys (The letters of the selected item are displayed
in yellow).
(5) The setting value will be stored automatically when
release the remote control unit keys.
(6) Press the [EXIT] key twice to return to the normal screen.
Fig.1
Fig.2
(7) SERVICE MENU setting
Verify what to set in the SERVICE MENU, and set whatever is necessary. Refer to the SECTION 3 ADJUSTMENT for setting.
SERVICE MENU
PICTURE SOUND
GAME
LOW LIGHT
HIGH LIGHT
RF AFC CHK
VCO(CW)
SELECT BY EXIT BY
OPERATE BY
EXIT
SYSTEM CONSTANT
MODEL
:
*******
V-CHIP
:
YES
CAN V-CHIP
:
YES
******** *****
SELECT BY EXIT BY
OPERATE BY
EXIT