JVC LT-52GZ79 Service Manual page 12

3.3 MEMORY IC REPLACEMENT
• This model uses the memory IC.
• This memory IC stores data for proper operation of the video and drive circuits.
• When replacing, be sure to use an IC containing this (initial value) data.
3.3.1 MEMORY IC TABLE
Symbol Number of pins
IC7201 48-pin
IC7602 8-pin
3.3.2 MEMORY IC REPLACEMENT PROCEDURE
1. Power off
Switch off the power and disconnect the power plug from the AC outlet.
2. Replace the memory IC
Be sure to use the memory IC written with the initial setting values.
3. Power on
Connect the power plug to the AC outlet and switch on the power.
4. Receiving channel setting
Refer to the OPERATING INSTRUCTIONS and set the receive channels (Channels Preset) as described.
5. User setting
Check the user setting items according to the given in page later. Where these do not agree, refer to the OPERATING
INSTRUCTIONS and set the items as described.
6. SERVICE MODE setting
Verify what to set in the SERVICE MODE, and set whatever is necessary (Fig.3-2). Refer to the SERVICE ADJUSTMENT for setting.
3.3.3 SERVICE MODE SETTING
SERVICE MODE SCREEN
MAIN MENU SCREEN
SERVICE MENU SERVICE MENU
1. ADJUST 1. ADJUST
2. SELF CHECK 2. SELF CHECK
3. I2C STOP 3. I2C STOP
ADJUSTMENT MODE SCREEN
S001 S001
PAL50 FULL PAL50 FULL
1-12 (No.YA665<Rev.001>)
Mounting PWB
DIGITAL PWB
DIGITAL PWB
R DRIVE R DRIVE 137 137
STD STD H H
Fig.3-2
Main content of data
Program (Video process) of IC6001(System CPU) is memorized.
Setting value of IC7301(MAIN CPU) is memorized.
SETTING ITEM
Setting items
Video system setting
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
Settings Item No.
Adjust S001 - S009
Fixed T001 - T003
Fixed M001 - M224
Fixed F001 - F002
Fixed D001
Fixed Z001