LG 064aadj free download

File name 064aadj.pdf

ADJUSTMENT INSTRUCTIONS V Safety Precautions O SECAM-L' Adjustment 1. It is safe to adjust after using insulating transformer between the power supply line and chassis input to prevent the risk of NOTE : This adjustment should be performed after PIF electric shock and protect the instrument. adjustment. 2. Never disconnect leads while the TV receiver is on. 3. Don't short any portion of circuits while power is on. Test Point : TP1 4. The adjustment must be done by the correct appliances. 5. Unless otherwise noted, set the line voltage to 230Vac!10%, Adjust : VR102 50Hz. 1) Turn on S1 and S3 and off S2. V Test Equipment required 2) Adjust VR102 so that the DC voltage may be indicated 1. RF signal generator (with pattern generator) 2.5!0.1Vdc. 2. DC Power Supply 3. Multimeter (volt meter) 4. Oscilloscope 5. Color analyzer O RF AGC (Automatic Gain Control) Adjustment Main Board(Component side view) Test Point : TP2 (J8) or Observing Display Adjust : VR101 V Multimeter or Oscilloscope 1 The RF AGC control (VR101) was aligned at the time of IC101 Power- JP7 IC05 manufacture for optimum performance over a wide range TDA4474 Supply conditions. Readjustment of VR101 should not be necessary 5V JP4 IC102 TP1 24 Signal- 0.01pF Generator unless unusual local conditions exist, such as ; 5V 7 JP1 38.9MHz (B/G,D/K,I,L) L107 34.25MHz (SECAM-L') 11 JP2