JVC AV-29WS3 Service Manual page 10

REPLACEMENT OF MEMORY IC
1. MEMORY IC
This TV uses the following memory IC.
Memory IC: IC1702 on MAIN PW Board
The memory IC memorizes data for correctly operating the video
and deflection circuits. When replacing the memory IC, be sure to
use the same type IC written with the initial values of data. In other
words, use the specific IC listed in "PRINTED WIRING BOARD
PARTS LIST". For its mounting location, refer to "ADJUSTMENT
LOCATIONS".
2. PROCEDURE FOR REPLACING MEMORY IC
(1) Power off
Switch the power off and unplug the power cord from the wall
outlet.
(2) Replacing the memory IC
Replace the memory IC with new one. Be sure to use the memory
IC written with the initial data values.
(3) Power on
Plug the power cord into the wall outlet and switch the power on.
(4) Check and setting of SYSTEM CONSTANT SET:
1) Press the DISPLAY key and the PICTURE MODE key on the
remote control unit simultaneously.
The SERVICE MENU screen will be displayed.(See Fig.1.)
2) In the SERVICE MENU, press the DISPLAY key and PIC-
TURE MODE key simultaneously. Then, the SYSTEM CON-
STANT SET screen will be displayed.(See Fig.2.)
3) Check whether the setting values of the SYSTEM CONSTANT
SET are the same as those indicated in Table1.
If the value is different, select the setting item with the MENU
&/^ key, and set the correct value with the MENU */Tkey.
4) Press the DISPLAY key twice to return to the normal screen.
(5) Receive channel setting
Refer to the OPERATING INSTRUCTIONS and set the receive
channels (channels preset).
NAME OF REMOTE CONTROL KEYS
MUTING
SYSTEM
COLOUR SOUND
DISPLAY
DISPLAY
MENU
I/II
TV/VIDEO
1
OFF
TIMER
4
PICTURE
MODE
PICTURE
7
MODE CHANNEL
RETURN+
SCAN
CHANNEL
REVEAL HOLD
SUBPAGE
STORE
POWER
CINEMA
SURROUND
ECO
SENSOR
MENU
MENU
MENU
TV/TEXT
MENU
2 3
5 6
8 9
- / --
0
VOLUME
TEXT
INDEX SIZE
CANCEL
MODE
(6) User setting
Check the user setting values in 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 for each setting item in the SERVICE
MENU.(See Table 3.) If readjustment is necessary, perform ad-
justment referring to "SERVICE ADJUSTMENTS".
1. IF
3. DEF
5. PRESET
7. PLUG & PLAY (ON)
1-7 : SELECT
******* **** ***** *****
SYSTEM CONSTANT SET 1
SYSTEM
COMB
TILT
TEXT
SUPER BASS
LANGUAGE
>? : SEL
SYSTEM CONSTANT SET 2
MSP
BILINGUAL
B / B SOUND
TUNER
COLOR AUTO
>? : SEL
SYSTEM CONSTANT SET 3
LOCK
>? : SEL
SYSTEM CONSTANT SET 4
3D SURROUND
3CH VOL/TONE
AMP TUNER
>? : SEL
No. 52081
SERVICE MENU
SERVICE MENU
2. VC
4. VSM PRESET
6. A2NICAM
DISPLAY : EXIT
**** **** *** ***
Fig. 1
SYSTEM CONSTANT- Ι
MULTI
YES
YES
ERCMI
YES
E/R/C/M/I
- + : OPE DISP : EXIT
SYSTEM CONSTANT- II
YES
YES
NO
MU
YES
- + : OPE DISP : EXIT
III
SYSTEM CONSTANT-
1 MHz : 040
500 KHz
: 040
250 KHz : 040
156. 25 KHz : 030
31.25 KHz : 030
- + : OPE DISP : EXIT
IV
SYSTEM CONSTANT-
YES
YES
NO
- + : OPE DISP : EXIT
Fig. 2
AV-29WS3
9