BEKO 12.6 free download

File name 12.6.pdf

ELECTRICAL ADJUSTMENTS BEKO Chassis 12.6 ACCESSING THE SERVICE MODE To enter the Service Mode, `Service In/Out" button on the Service Remote Control or activate the "Picture Menu" with the user remote control and press "8500". "Red" , "Green", "Yellow" and "Blue" Teletext buttons are for Feature Setup, Geometry, White Balance and AFC menus respectively. Press "0" button to exit the Service Mode. 1. POWER SUPPLY VOLTAGE Connect a digital voltmeter to the cathode of D607 diode at the AV1 mode of the TV and set the screen voltage to the minimum. Adjust the main supply voltage +B with P601 potentiometer to the following voltage value. Adjust the screen potentiometer to the level where a picture is just visible. 14" A34LPE02X01 106 VDC 20" A48ECR143X51 118 VDC 21" A51EER133X41 118 VDC 2. AFC ADJUSTMENT Before starting the adjustment follow the procedure below: Enter service mode, change "VIDEO" header to the "NEW". Then exit from service mode. Remarks: 1. The procedure above must always be done after replacing the Video IC (IC101) or EEPROM IC. 2. AFC adjustment must be done again when "VIDEO" header became "NEW" accidentally. For BG, DK, I, L standards (38.9 MHz) : Supply a 471.25 MHz BG system colour bar RF signal to the set by a pattern generator and find this signal in "setup" menu (C21). In order to deactivate AFT loop, shift value of "fine tuning" from central point by one unit and then shiftback to the central point again (2 small vertical lines are seen in the scale on central point). Store the channel by selecting "Store" and pressing "OK" button. Enter Service Mode and press "Blue" Teletext button. Adjust the "AFT38" item of service menu to read a value between "78" and "7C" (hexadecimal) on the right part of the screen. For example: AFT38 89 7B For SECAM L' Standard (33.9 MHz): Supply a 55.75 MHz, L' system colour bar RF signal to the set by a pattern generator and find this signal in "setup" menu (C02). In order to deactivate AFT loop, shift value of "fine tuning" from central point by one unit and then shiftback to the central point again (2 small vertical lines are seen in the scale on central point). Store the channel by selecting "Store" and pressing "OK" button. Enter Service Mode and press "Blue" Teletext button. Adjust the "AFT33" item of the service menu to read a value between "78" and "7C" (hexadecimal) on the right part of value of item "AFT38". For example: AFT38 : 76 78 AFT33 : 65 3. AGC ADJUSTMENT Apply a signal at the channel 32 with 70