JVC AV-T2122 Service Manual page 2

AV-T2122
MEMORY IC REPLACEMENT
1. Memory IC
This model uses a memory IC.
The memory IC stores data for proper operation of 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.
Be sure to use memory ICs written with the initial data values.
(3) Power on
Connect the power cord to the wall outlet and switch on the power.
(4) System constant check and setting
１ ) Simultaneously press the DISPLAY key and VIDEO STATUS key
of the remote control unit.
２ ) The SERVICE MENU screen of Fig.1 is displayed.
３ ) While the SERVICE MENU is displayed, again simultaneously
press the DISPLAY and VIDEO STATUS keys to display the Fig.2
SYSTEM CONSTANT screen.
４ ) Refer to the SYSTEM CONSTANT table 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 the normal screen.
(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 2-1 and 2-2.
Where these do not
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.
8
PROCEDURE
agree, refer to the OPERATING
SERVICE MENU
PICTURE
VIDEO STATUS
LOW LIGHT
RF AFC CHK
VCO (CW)
SELECT
OPERATE BY
SYSTEM CONSTANT
VIDEO
AUDIO
VARI. OUT
GAME
CINEMA
SELECT
OPERATE BY
SYSTEM CONSTANT
CCD
RETURN+
SURROUND
M37272MA-×××
SELECT
OPERATE BY
No.51866
SCREEN DISPLAY
SOUND
OTHERS
HIGH LIGHT
I2C BUS CTRL
BY EXIT BY
EXIT
IT
Fig.1
: 2
: MTS
: NO
: YES
: YES
BY EXIT BY
EXIT
: YES
: YES
: YES
××× ××× SP ×××
BY EXIT BY
EXIT
Fig.2