SERVICE MODE ENTRY
To enter service mode, a special remote [Service Remote Control] is needed. You can order it from the manufacturer. All buttons of Service Remote control are same with user remote control, only service In | Out key was added to service remote control.
For multimedia Models: Enter [7=>5=>9=>2] while the picture menu is displayed, to enter the service menu option. Press [0] to Exit from service menu.
POWER SUPPLY VOLTAGES. [Voltage at the Cathode of 'D610]
14" => A33LPE02X01 => 106VDC.
20" => A4ECR143X51 => 118VDC.
21" => A51EER 133X41 => 118VDC.
AGC ADJUSTMENT
- Apply a signal at channel 32 with 60 +/-1dBuV level to the antenna input. Switch sound carrier Off, and switch "Video Ext" On.
- Connect oscilloscope to pin -11 (IF2) of Tuner and ground.
- Enter Service Mode and go "AGC' header.
- Adjust the amplitude in between 630 & 500mVpp(+/-)20mVpp.
GEOMETRY ADJUSTMENT
- Enter service mode. Select Green button in service menu. "H-POS" is for horizontal position. "V.HEI" is for vertical size. "LNRTY" is for vertical linearity. "S.COR" is for S-Correction adjustment.
SCREEN ADJUSTMENT
- Enter service mode. Select 'Yellow' button in service menu. Select "SCRN' item. Press Vol+ of - button to see a white horizontal line at the center of the screen. Adjust the screen pot-meter to just visible level of horizontal line. return to 'Picture Mode' by pressing Vol(+).
WHITE BALANCE ADJUSTMENT
- Enter Service Mode. Select 'Yellow' button in service menu. Select and adjust "G.CUT" to 128. Adjust "R.CUT" and "B.CUT" for cut adjustment. Select and adjust 'R.DRV" and "B.DRV" for white balance. Exot from service mode.
