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ADJUSTMENTS
IMPORTANT NOTICE
Do not attempt to adjust the following service adjustments except when adjustments are required in servicing
otherwise it may cause loss of performance and product safety.
+ B VOLTAGE ADJUSTMENT
1. Receive white raster pattern.
2. Set controls to normal.
3. Connect digital voltmetre to test point TP-B and GND.
4. Adjust voltage to 150 ±0.5V by using VR641.
AGC ADJUSTMENT
1. Input and tune an RF signal which is UHF to the clear-
est station.
2. Connect digital voltmetre to test point TP-A and GND.
4. Enter the service mode and select item no. 304. AGC
TAKE OVER
5. Press the LEVEL+ or LEVEL - button to adjust volt-
age to be 3.2Vdc.
FOCUS ADJUSTMENT
By using FOCUS VR, adjust focus control for well
defined scanning lines.
GREY SCALE ADJUSTMENT
SCREEN ADJUSTMENT
1. Enter the service mode and select item no. 6.
COLLAPSED LINE
2. Turn screen VR until collapsed line is just visible then
stop turning. Press menu key on remote control to exit
the service mode.
DRIVE ADJUSTMENT
3. Select item no.151. WPR - N (R-Drive) or 152. WPG -
N (G-Drive) and adjust both initially to 20.
4. Change data value of each item by using LEVEL + or
LEVEL - button to obtain the proper white balance.
C7VDS
PCC ADJUSTMENT
PCC ADJUSTMENT
1. Receive cross hatch pattern and set screen mode to
"FULL".
2. Enter the service mode and select item no. 23. EW
PARABOLA
3. Press the LEVEL+ or LEVEL - button to adjust the
vertical line to be straight.
TRAPEZOID ADJUSTMENT
1. Receive cross hatch pattern and set screen mode to
"FULL".
2. Enter the service mode and select item no. 24.
TRAPEZIUM
3. Press the LEVEL+ or LEVEL - button to correct the
trapezum distortion of the vertical line.
-8-
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