LG 007CADJ free download

File name 007CADJ.pdf

ADJUSTMENT INSTRUCTIONS O Safety Precautions O L' VCO Adjustment (For SECAM-L' MODEL) 1. It is safe to adjust after using insulating transformer between the power supply line and chassis input to prevent the risk of Test Point : TP1 electric shock and protect the instrument. 2. Never disconnect leads while the TV receiver is on. Adjust : VR122 3. Don't short any portion of circuits while power is on. 4. The adjustment must be done by the correct appliances. 5. Unless otherwise noted, set the line voltage to 230Vac!10%, 1) Connect the measuring equipment to the Main Board as 50Hz. shown in Fig.1. 5. The adjustment of TVshould be performed after warming up 2) Set RF frequency and output level of RF SIGNAL for 15 minutes. GENERATOR as shown Table 1. 3) Turn on S1,S3 and off S2. 2) Adjust VR122 so that the DC Voltage may be 2.4!0.05Vdc. O Test Equipment required 1. RF signal generator (with pattern generator) ORF AGC (Automatic Gain Control) Adjustment 2. DC Power Supply 3. Multimeter (volt meter) Test Point : TP 2(J15) 4. Oscilloscope 5. Color analyzer Adjust : VR121 1) Input PAL-B/G 05 CH. 2) Connect Multimeter to TP2(J15),AGC adjustment point. V Multimeter or Oscilloscope 3) Adjust VR121 until the voltage of Multimeter becomes 2.5!0.1V. 1 IC101 IC102(KI7805) TDA4470 OScreen Voltage Adjustment R108