LG 072aadj free download

File name 072aadj.pdf

ADJUSTMENT INSTRUCTIONS Y Safety Precautions : PIP VCO Adjustment (For 2TUNER PIP 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 : TP20 on PIP Board electric shock and protect the instrument. 2. Never disconnect leads while the TV receiver is on. Adjust : LP8 3. Don't short any portion of circuits while power is on. 4. The adjustment must be done by the correct appliances. 1) Turn on the TV set. 5. Unless otherwise noted, set the line voltage to 230Vac!10%, 2) Adjust LP8 so that the waveform of 38.9MHz may be the 50Hz. same as the figure below. Y Test Equipment required A : 33.0MHZ 1. RF signal generator (with pattern generator) D 2. DC Power Supply B : 34.5MHZ 3. Multimeter (volt meter) C : 37.25MHZ 4. Oscilloscope A B C E D : 38.9MHZ 5. Color analyzer E : 41.0MHZ : Auto Fine Tuning Adjustment Test Point : TP23 on PIP Board V Multimeter or Oscilloscope Adjust : LP5 1 J15(ST-BY 5V) IC101 1) Turn on the TV set. Power- TDA4474 Supply 2) Adjust LP5 so that the waveform of 38.9MHz may be the 5V R127(IF Vcc) same as the figure below. 0.01pF C133(+) 24 7