JVC AV-14F1P(PH), Service Manual

Page: 6 / 27

AV-14F1P
No. 56084 6
REPLACEMENT OF MEMORY IC
1. MEMORY IC
This TV uses the following memory IC.
Memory IC: IC1704 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, re-
fer 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 VIDEO STATU key on
the remote control unit simultaneously.
The SERVICE MENU screen will be displayed. (See
Fig. 1.)
2) In the SERVICE MENU, again press the DISPLAY key
and the VIDEO STATU key simultaneously. Then, the
SYSTEM CONSTANT SET screen will be displayed.
(See Fig. 2.)
3) Check whether the setting values of the SYSTEM CON-
STANT SET are the same as those indicated in Table
1. If the value is different, select the setting item with
the MENU
1
/
4
key, and set the correct value with the
MENU
2
/
3
key.
(The selected value will be stored in memory when the
MENU
2
/
3
key is released.)
4) Press the EXIT key twice to return to the normal screen.
NAME OF REMOTE CONTROL KEYS
Fig. 1
SERVICE MENU
SELECT BY
OPERATE BY EXIT BY
IT
PICTURE
VIDEO STATUS
OTHERS
LOW LIGHT HIGH LIGHT
RF AFC CHK
VCO (CW)
I2C BUS CTRL
EXIT
Fig. 2
SYSTEM CONSTANT
SELECT BY
OPERATE BY EXIT BY
IT
VIDEO : 1
AUDIO : MONO
VARI. OUT : NO
GAME : YES
CINEMA : YES
EXIT
SYSTEM CONSTANT
CCD : YES
: YES
SURROUND :
NO
✽✽✽✽✽✽✽✽ ✽✽✽✽✽
SYSTEM CONSTANT- I
SYSTEM CONSTANT-
II
SELECT BY
OPERATE BY EXIT BY
IT
EXIT
+
−
POWER
DISPLAY
VIDEO
STATUS
COLOUR
SYSTEM
EXIT
1
4 5 6
2 3
7 8
100+
9
MENU
CHANNEL
VOLUME
MENU
MENU
MENU
DISPLAY
MENU
TV/VIDEO
CLOSED
CAPTION
SLEEP
TIMER
MUTING
VIDEO STATUS
EXIT
0
PICTURE
BOOSTER
(5) Receive channel setting
Refer to the OPERATING INSTRUCTIONS and set the
receive channels (channels preset).
(6) User settings
Check the user setting items in Tables 2-1 and 2-2, 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, per-
form adjustment referring to "SERVICE ADJUSTMENTS".