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File name BEKO 12.6 SM.pdf

ELECTRICAL ADJUSTMENTS ACCESSING THE SERVICE MODE BEKO Chassis 12.6 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" 20" 21" A34LPE02X01 A48ECR143X51 A51EER133X41 106 VDC 118 VDC 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±1dBuV level to the antenna input (switch sound carrier "Off" and switch "Video Ext" to the "On" state). Connect an oscilloscope between the pin 11 (IF2) of Tuner and ground. Enter service mode and find "AGC" header. Adjust the amplitude which is monitored from oscilloscope to the values given below using with Volume +/Volume- key of the remote control . PAL BG standarts : 750 mVpp±20mVpp PAL/Secam BG/DK standarts : 750 mVpp±20mVpp Secam LL' standarts : 600 mVpp±20mVpp PAL I standarts : 7