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16.1 CHASSIS Manual de Servicio
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1. ELECTRICAL ADJUSTMENTS
1.1 Supply Voltage Adjustment Connect a digital voltmeter to the cathode of diode D950 at the AV mode of the TV and set the screen voltage to the minimum with the screen potentiometer. Adjust the main supply voltage (B+) with P901 potentiometer to the following value (after supply adjustment, readjust Screen and focus voltage). 20� : 119 VDC (for A48ECR43X51) 21� : 114 VDC (for A51EER33X41)
2. SERVICE ADJUSTMENTS
You need the special service remote control to enter and exit the service menu of the TV (you can order it from the manufacturer). All buttons of the Service RC are same with the user remote control, only service menu In / Out is added to it (please see the picture below). Navigation Service In/Out : Enters to / exits from the Service Menu P+ / P: Moves upward / downward inside the menu V+ / V: Changes the values or options
2.1 IF Adjustments 2.1.1 PAL SECAM BG/DK/I � � � � � � � � � � 2.1.2 � � � � � Supply a 471.25 MHz BG system colour bar RF signal to the set by a pattern generator. 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. Switch on the Service Menu with the Service RC. Check that value of �VCO C� is �07�. Adjust the coil LC100 until the colour of �:� sign turns red (�<� and �>� are white). Check that value of �VCO F� is �63�. Adjust the coil LC100 until the colour of �:� sign turns red (�<� and �>� are white). Exit from the service menu with the Service RC. SECAM L/L� (if available) Supply a 55.75 MHz, L� system colour bar RF signal to the set by a pattern generator. 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. Switch on the Service Menu with the Service RC.
