JVC AV-34LS Service Manual page 9

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 –/+key.
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
DISPLAY
DISPLAY
MENU
CHANNEL
SYSTEM
COLOUR SOUND
TV/VIDEO
I/II
PICTURE MODE
PICTURE
MODE
CHANNEL SCAN RETURN
TV/TEXT ECO SENSOR
REVEAL
MODE
POWER
MENU
+
MENU
MENU
MENU
VOLUME
MUTING
1 2 3
4 5 6
7 8 9
0
-/--
OFF TIMER
TEXT
HOLD INDEX STORE
SIZE SUBPAGE CANCEL
(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 (OFF)
1-7 : SELECT
******* **** ***** *****
1. IF
3. DEF
5. PRESET
6. PLUG & PLAY (OFF)
1-6 : SELECT
******* **** ***** *****
[AV-34LX/LX-A, AV-3408TEE]
SYSTEM CONSTANT SET 1
SYSTEM
COMB
TILT
TEXT
SUPER BASS
LANGUAGE
SYSTEM CONSTANT SET 2
MSP
BILINGUAL
B / B SOUND
TUNER
COLOUR AUTO
SYSTEM CONSTANT SET 3
LOCK 1 MHz
No. 51854
AV-34LS AV-34LX
AV-34LH AV-3408TEE
SERVICE MENU
SERVICE MENU
2. VC
4. VSM PRESET
6. AUDIO
DISPLAY : EXIT
**** **** *** ***
[AV-34LS/LS-AU/LH]
SERVICE MENU
2. VC
4. VSM PRESET
DISPLAY : EXIT
**** **** *** ***
Fig. 1
Ι
SYSTEM CONSTANT-
MULTI
NO
NO
YES
NO
E / R / C
: SEL - + : OPE DISP : EXIT
ΙΙ
SYSTEM CONSTANT-
YES
NO
NO
MU
NO
: SEL - + : OPE DISP : EXIT
ΙΙΙ
SYSTEM CONSTANT-
020
500 kHz 020
250 kHz 020
156.25 kHz 015
31.25 kHz 015
: SEL - + : OPE DISP : EXIT
Fig. 2
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