Replacement Of Memory Ic; Service Adjustment - Memorex MT2025D - 20" CRT TV Service Manual

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.
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" à "8"à"8"à"9"à"3" buttons in sequence to enter into factory status.
2) If the memory IC haven't been written with the initial data, press [Program+] / [Program-] to select
item INIT and press [VOLUME+] / [VOLUME-] to start initialize memory IC.
3) Check the setting value of the SYSTEM default value of Table below. If the value is different, select
items by [Program+] / [Program-] keys and set value by [VOLUME+] / [VOLUME-] keys.
4) Press "EXIT" button to return to the normal screen.

4. SERVICE ADJUSTMENT

Specific operation: use remote controller
Press "MENU" à "8"à"8"à"9"à"3" buttons in sequence to enter into factory mode.Press "MENU" to enter into
next factory menu.
Press [Program+] / [Program-] to select items and press [VOLUME+] / [VOLUME-] key, to make data
adjustment of corresponding factory menus.
Press "EXIT" key to exit factory mode.
Focus adjustment
1. Receive a crosshatch signal.
2. While watching the screen, adjust the FOCUS VR on the FBT to make the vertical and horizontal lines as
fine and sharp as possible.
Geometrical adjustment
Receive NTSC standard complete pattern signal.
Adjustment steps：
a) Adjust V SC , S emendation
b) Adjust V SIZE , to get 92% of vertical picture contents would be displayed on CRT.
c) Adjust V POS , the centre horizontal line corresponds to CRT vertical centre.
d) Adjust V LIN , to the linearity of P card field is in proper condition.
e) Adjust H PHASE , to get the picture horizontal centre correspond to CRT horizontal centre.
Receive NTSC signal and repeat above adjustment.
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