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3.REPLACEMENT OF MEMORY IC
1. MEMORY IC.
This TV uses memory IC. In the memory IC are memorized data for correctly operating the video and
deflection circuits.
When replacing memory IC, be sure to use IC written with the initial value of data.
2. PROCEDURE FOR REPLACING MEMORY IC
(1) Power off
Switch the power off and unplug the power cord from AC outlet.
(2) Replace IC
Be sure to use memory IC written with the initial data values.
(3) Power On
Plug the power cord into the AC outlet and switch the power On.
(4) Check and set system default value:
1) Press “MENU” key followed by digits '6''4''8' and '3'. then Press “TEST” key on the Remote
control unit for factory used.
2) The red “M”or”factory” will be displayed on the screen, repeat this and it will changed as follow:
normal-M(factory)-BUS open-normal..
3) Press digital key, (Mkey) and corresponding on-screen display will be appeared.
4) Check the setting value of the SYSTEM default value of Table below. If the value is different,
select items by [CH+]/[CH-] keys and set value by [VOL+]/[VOL-] keys.
5) Press “STANDBY” key again and return to the normal screen.
4.SERVICE ADJUSTMENT
B1 POWER SUPPLY
1. Receive normal colour bar signal.
2. Connect DC voltmeter to VD524- and isolated ground.
3. Adjust potentiometer in power unit to get the voltage as 110V ±1.0V for 21 inch hereinafter,
FOCUS ADJUSTMENT
1. Receive a crosshatch signal.
2. While watching the screen, adjust the FOCUS VR to make the vertical and horizontal lines as fine and
sharp as possible.
BUS CONTROL ADJUSTMENT
TDA9351/9353:to enter BUS control mode, Press “MENU” key followed by digits '6''4''8' and '3'. then
press digit Press “0” to “9“ key, (Mkey) and corresponding on-screen display will be appeared.
TDA8370:to enter BUS control mode, Press “MENU” key followed by digits '6''4''8' and '3'. then Press
“TEST” key on the Remote control unit twice for factory used(or press digits '6''4''8' and '3' twice.). and then
press digit Press “0” to “9“ key, (Mkey) and corresponding on-screen display will be appeared.
On TV screen “TEST” will be indicated, this means entered bus control mode.
And press following key, each function will be available.
