BEKO - 12.4 - 12.5 MODELS SERVICE MODE and ADJUSTMENTS
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