Memory Ic Replacement - JVC AV-27D302 Service Manual

AV-27D302
AV-27D202

MEMORY IC REPLACEMENT

1. Memory IC
This model uses a memory IC.
This memory IC stores data for proper operation of the 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 outlet.
(2) Replace the memory IC
Initial value must be entered into the new IC.
(3) Power on
Connect the power cord to the outlet and switch on the power.
(4) System constant check and setting
1) Press SLEEP TIMER key and, while the indication of "SLEEP TIMER 0
MIN." is being displayed, press DISPLAY key and VIDEO STATUS key
on the remote control unit simultaneously.
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 UP/DOWN ( / )
key and adjust the setting with the LEFT/RIGHT (
5) After adjusting, release the LEFT/RIGHT(
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.
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.
Procedure
) keys.
) key to store the setting
SERVI CE MENU
PI CTURE
THEATER
LOW LI GHT
RF AFC CHK
SELECT BY
OPERATE BY
SYSTEM CONSTANT
MODEL
V- CHI P
CAN V- CHI P
**** * * * **** *** *** ***
SELECT BY
OPERATE BY
No.51788
Screen display
SOUND
HI GH LI GHT
EXI T BY
EXI T
Fig.1
**- **-* * * * **** **- **- **** **** ****
:
: YES
: YES
**** **** ****- *** *** **** * * * * * * * ***
EXI T BY
EXI T
Fig.2