JVC AV-27F704/BSA Service Manual page 29

3.3 MEMORY IC REPLACEMENT
3.3.1 MEMORY IC
This TV uses memory IC.
This memory IC stores data for proper operation of the video and deflection circuits.
When replacing the memory IC, be sure to use an IC containing this (initial value) data.
3.3.2 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 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. Confirm the system constant value
• 12.SYSTEM (SYS) do not adjust normally.
• The adjustment should not be done without signal.
How to enter the SERVICE MENU.
Confirm that the setting of TV/CATV SW is at the "TV" side
and the setting of VCR/DVD SW is at the "VCR" side.
(1) Before disappear the display of SLEEP TIMER
settings, simultaneously press the [DISPLAY] key and
[VIDEO STATUS] key of the remote control unit.
(2) The SERVICE MENU screen will be displayed as
shown Fig.1.
How to enter the 12. SYSTEM(SYS).
(1) While the SERVICE MENU is displayed, select the
12.SYSTEM(SYS) item with [CH / ] keys, and the
[VOL / ] keys is pressed, the screen will be
displayed as shown in Fig.2.
(2) Refer to the "12.SYSTEM(SYS)" table and check the
setting items. If the value is different, select the setting
item with the [CH / ] keys and adjust the setting
with the [VOL / ] keys. (The letters of the selected
item are displayed in yellow.)
(3) When adjustment has completed, the values store into
memory IC automatically.
(4) Press the [EXIT] key to return the SERVICE MENU
screen.
(5) Then press the [EXIT] key again to return the normal
screen.
5. Receiving 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 the "FACTORY
SETTING ITEM" table.
Where these do not agree, refer to the OPERATING
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.
1-12 (No.52113)
SERVICE MENU
SERVICE MENU
1. V/C(S) 2.
DEF(D)
3. SOUND(A) 4. OTHERS(F)
6. 3L Y/C(LYC)
7. LOW LIGHT 8. HIGH LIGHT
9. RF AFC 10. VOC
11. I2C BUS 12. SYSTEM(SYS)
SELECT BY
OPERATE BY
Fig.1
12.SYSTEM (SYS)
SYS01 VIDEO IN
Fig.2
KEY ASSIGNMENT OF REMOTE CONTROL UNIT
SLEEP TIMER key
DISPLAY &
VIDEO STATUS key
V.STATUS
VOL / key
CH / key
EXIT BY EXIT
ASPECT LIGHT
C.C.
EXIT key
[RM-C1252G]