JVC LT-37X688 Service Manual page 14

3.4 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.
3.4.1 MEMORY IC TABLE
Symbol Number of pins
IC6401 48-pin
IC7002 8-pin
3.4.2 MEMORY IC REPLACEMENT PROCEDURE
1. Power off
Switch off the power and disconnect the power plug.
2. Replace the memory IC
Be sure to use a memory IC written with the initial setting data.
3. Power on
Connect the power cord to the wall outlet and switch on the
power.
4. Receiving channel setting
Refer to the OPERATING INSTRUCTIONS (USER'S GUIDE)
and set the receive channels (Channels Preset) as described.
5. User settings
Check the user setting items according to the "FACTORY
SETTING ITEM" table.
Where these do not agree, refer to the OPERATING
INSTRUCTIONS (USER'S GUIDE) and set the items as
described.
6. SERVICE MODE setting
Verify what to set in the SERVICE MODE, and set whatever is
necessary.
Refer to the SERVICE ADJUSTMENT for setting.
3.4.3 SERVICE MODE SETTING ITEMS
Setting items
TV-Micro Service
Video system setting
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
Digital Service
Audio system setting
Mi-com setting
1-14 (No.YA535)
Mounting PWB
DIGITAL PWB
DIGITAL PWB
Settings Item No.
Adjust S001 - S009
Fixed T001 - T003
Fixed M001 - M224
Fixed F001 - F002
Fixed D001
Fixed Z001
Adjust A001 - A008
C001 - C040
Fixed X001 - X201
S001 - S025
Main content of data
Program(Video process) of IC6001(System CPU) is memorized.
Setting value of IC7001(MAIN CPU) is memorized.
SERVICE MODE SCREEN
SERVICE MENU SERVICE MENU
1. TV-Micro Service 1. TV-Micro Service
2. Digital Service 2. Digital Service
3. Digital Diagnostics 3. Digital Diagnostics
4. Digital Engineering Functions 4. Digital Engineering Functions
Press [2] key
TV-MICRO SERVICE MODE SCREEN
TV-Micro Service TV-Micro Service
1. ADJUST 1. ADJUST
2. SELF CHECK 2. SELF CHECK
3. I2C STOP 3. I2C STOP
DIGITAL SERVICE MODE
Digital Service
1. Adjust
2. Memory Edit
3. Xilleon Register Edit
4. ---
5. Select Channel Map
6. Clear Channel Map
7. Digital Tunig Test
Press [1] key
SCREEN