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12. Adjustment
1. Safety precautions
1. It is safe to adjust after using insulating transformer between the power supply and chassis
input to prevent the risk of electric shock and protect the instrument.
2. Never disconnect leads while the TV receiver is on.
3. Don't short any portion of circuits while power is on.
4. The adjustment must be done by the correct appliances. But this is changeable in view of
productivity.
2. Adjustment procedure
The chassis of this TV set uses sanyo IC with the latest digital bus processing technology.
The adjustment points are fewer and the adjustment is simpler. The adjustment method is as
follows:
1. +B: 110±1V adjustment.
1) Switch on the power and connect NTSC circular signals to the tuner.
2) Adjust variable resistor RP551 until the voltage of the main power is 104±1V.
2. Screen voltage adjustment.
1)
Switch on the power and receive NTSC system circular signal. Warm up the TV set for 15 min.
2) Enter the adjustment state. Press the "MUTE" button, then a bright horizontal line appears.
Adjust screen potentiometer to let the horizontal line just appears.
3. Focus adjustment.
1) Receive electronic circular signal.
2) Set picture mode on standard mode.
3) Adjust focus potentiometer until the optimum picture is achieved.
4. White balance adjustment.
1) Set the picture mode on standard mode.
2) Enter the D state and adjust RCUT, GCUT, BCUT, GDRV and BDRV.
3) Coordinate of reference white color: (X=0.281, Y=0.311).
6. Adjustment of horizontal and vertical position and size.
1) Switch on the power and connect the signals to the tuner to receive NTSC system circular
signal.
2) Enter the D state. Adjust HPOS to change the horizontal position and V. POSE to change the
vertical position. Adjust V.SIZE to change the vertical size until the vertical size is 90-92%.
Horizontal size is related to the capacitor C436. Hold the horizontal size is 90-92%.
Adjustment
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