JVC AV28WT5EPS Service Manual page 15

REPLACEMENT OF MEMORY ICs
1. Memory ICs
This TV use memory ICs. In the memory ICs, there are memorized data
for correctly operating the video and deflection circuits. When replacing
memory ICs, be sure to use ICs written with the initial values of data.
2. Procedure for replacing memory ICs
(1) Power off
Switch the power off and unplug the power cord from the outlet.
(2) Replace ICs.
Be sure to use memory ICs written with the initial data values.
(3) Power on
Plug the power cord into the outlet and switch the power on.
(4) Check and set SYSTEM CONSTANT SET:
* * * *
It must not adjust without signal.
1) Press the INFORMATION key and the MUTING key of the
REMOTE CONTROL UNIT simultaneously.
2) The SERVICE MENU screen of Fig. 1 will be displayed.
3) While the SERVICE
INFORMATION key and MUTING key simultaneously, and the
SYSTEM CONSTANT SET screen of Fig. 2 will be displayed.
4) Check the setting values of the SYSTEM CONSTANT SET of
Table 1. If the value is different, select the setting item with the
FUNCTION UP/DOWN key, and set the correct value with the
FUNCTION -/+ key.
5) Press the MENU key to memorize the setting value.
6) Press the INFORMATION key twice, and return to the normal
screen.
(5) Setting of receive channels
Set the receive channel.
For setting, refer to the OPERATING INSTRUCTIONS.
(6) User settings
Check the user setting values of Table 2, and if setting value is
different, set the correct value.
For setting, refer to the OPERATING INSTRUCTIONS.
(7) Setting of SERVICE MENU
Verify the setting items of the SERVICE MENU of Table 3, and reset
where necessary.
For setting, refer to the SERVICE ADJUSTMENTS.
PROCEDURE
MENU is displayed,
MODEL=JK_EURO
press the
- +
NAME OF REMOTE CONTROL KEY
Names of key
INFORMATION
FUNCTION UP/DOWN
FUNCTION -/+
No. 51776
AV28WT5EPS AV24WT5EPS
AV28WT5EIS
AV28WT5EKS AV24WT5EKS
SERVICE MENU
1. IF 2. V/C
3. AUDIO 4. DEF
5. VSM PRESET 6. VPS
7. AUTO PROGRAM (OFF)
1-7 : SELECT : EXIT
Fig.1
SYSTEM CONSTANT SET
(V*.****)
: **
COUNTRY
: **
INCH
MODEL : WT
: STORE : EXIT
OK
JVC JK-II EURO V00
******** - *****
Fig.2
key
i i i i
MUTING
OK
MENU
▼
AV24WT5EIS
15