JVC AV-27320 Service Manual page 10

AV-27320
AV-27330
AV-27S33
MEMORY IC REPLACEMENT
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.
2. Memory IC replacement procedure
(1) Power off
Switch off the power and disconnec t the power cord from the outlet.
(2) Replace the memory IC
Be sure to use a memory IC written with the initial s etting data.
(3) Power on
Connect the power cord to the outlet and s witch on the power.
(4)Confirm the system constant value
" 12.SYSTEM (SYS) do not adjust normally.
" The adjustment should not be done without signal.
! Ho w to enter the SYSTEM (SYS).
1) Press the SLEEP TIMER key and set SLEEP TIMER for 「0 min」.
2) Before disappear the display of SLEEP TIMER settings , simultaneously
press the DISPLAY key and VIDEO STATUS key of the remote c ontrol
unit.
3) The SERVICE MENU screen of Fig.1 is displayed.
4) While the SERVICE MENU is displayed, select the 12.SYSTEM(SYS)
item with FUNCTION ▼/▲ keys, and the FUNCTION
press ed, the screen will be displayed as shown in Fig.2.
5) Refer to the SYSTEM (SYSTEM CONSTANT) TABLE 1 and check the
setting items . If the value is different, s elect the setting item with the
FUNCTION ▼/▲ keys and adjust the setting with the FUNCTION
/ keys. (The letters of the s elected item are displayed in yellow.)
6) When adjustment has completed, the v alues store into memory IC
automatic ally
7) 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 Pres et) as des cribed.
(6) User settings
Check the us er setting items acc ording to TABLE 2.
Where thes e do not agree, refer to the OPERATING INSTRUCTIONS
(USER'S GUIDE) and s et the items as described.
(7) SERVICE MENU setting
Verify what to s et in the SERVICE MENU, and s et whatever is
necessary. (Fig.1) Refer to the SERVICE ADJUSTMENT for setting.
10
SERVICE MENU
1.V/C(S)
3.SOUND(A)
5.PIP(PIP)
7.LOW LIGHT
9.RF AFC
11.I2C BUS
SELECT BY
OPERATE BY
SYS01 VIDEO IN
/ keys is
SETTING N o
KEY ASSIGNMENT OF REMOTE CONTROL UNIT
DISPLAY
SLEEP
TIMER
VIDEO
STATUS
FUNCTION
/
NOTE
Although design is different, each remote controller
has the s ame control function.
No. 51937
SERVICE MENU
2.DEF(D)
4.OTHERS(F)
6.3L Y/C(LYC)
8.HIGH LIGHT
10.VCO
12.SYSTEM(SYS)
EXIT
EXIT BY
Fig.1
12.SYSTEM(SYS)
SETTING ITEM
***
Fig.2
SETTING VAL UE
(RM-C255)
FUNCTION
▼ / ▲
EXIT
Verified