JVC HD-Z56RF7/A Service Manual page 24

3.2 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.
3.2.1 MEMORY IC TABLE
Simbol Number of pins
IC3753 8-pin DRIVE PWB
IC7201 48-pin DIGITAL PWB
IC7602 8-pin DIGITAL PWB
3.2.2 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.1). Refer to the SERVICE ADJUSTMENT for setting.
3.2.3 SERVICE MODE SETTING
SERVICE MODE SCREEN
SERVICE 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 R DRIVE S001 R DRIVE
PAL50 FULL STD M PAL50 FULL STD M
1-24 (No.YA460)
Mounting PWB
138 138
Fig.1
Main content of data
Adjustment and setting data (GAMMA, SHADING, etc.) of
IC3701(DRIVE CPU) are memorized.
Progaram(Video process) of IC6001(System CPU) is memorized.
Setting value of IC7301(MAIN CPU) is memorized.
SETTING ITEM
Setting items
Video system setting
Audio system setting
Main CPU system setting
Drive system setting
(NOT USED)
(NOT USED)
Settings Item No.
Adjust S001 - S009
Fixed T001 - T003
Fixed M001 - M224
Fixed F001 - F002
Fixed D001
Fixed Z001