LG PC63A free download

File name PC63A.zip

Preparation for VCO Adjustment 1. Connect the measuring equipment to the TV as shown in Fig. 1. 2. Set RF output level of sweep S.G.(Signal Generator) to 80dBuV. 3. Set Alignment Scope, Volts/Div to 100mV, AC/DC switch to AC, Line/Ext switch to Ext. MAIN BOARD Ceramic CAP. 38.9MHz 10000pF IC101 Multimeter & Signal TDA4474 oscilloscope generator 2.5Vdc Z101 L107 Ceramic 3 4 5 G3962 CAP. C123(+) 10000pF 24 GND C25(+) J77 J169 5V 12Vdc Power Supply SW1 AM/FM SW GND(C26(-)) C25(-) R124 R139 GND SW2 L/L'SW Fig.1: Connection Diagram of Equipment for BG VCO Adjustment * VCO (Voltage Controlled Oscillation) Adjustment a) For B/G system Test Poin t : Pin 24 of IC101 (+ lead of C123) Adjust : L107 1) Turn on DC power supplies. 2) Adjust VCO adjust coil(L107)so that DMM reads 2.5Vdc+_0.1V. Ceramic MAIN BOARD CAP. 33.9MHz 10000pF IC101 Multimeter & Signal TDA4474 oscilloscope generator 2.5Vdc Z102 VR102 Ceramic 3 4 5 G3953 CAP. C123(+) 10000pF 24 GND(C122(-)) GND C25(+)