Memorex MT2025D Service Manual - Page 5
Replacement Of Memory Ic, Service Adjustment - will not power up
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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. 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" "8" "8" "9" "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" "8" "8" "9" "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. 0 PDF pdf Fact or y Pr o www. f i nepr i nt . com. cn