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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 115 ±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 to the service mode and select mode "REGU-
LAR", and select item no.1 "REGULAR 1, AGC".
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. Receive black & white pattern.
2. Enter to the service mode and select mode "REGU-
LAR", and select item no. 2 "REGULAR 2, CUT". The
horizontal line will appear on the screen.
3. Set the SCREEN VR for one colour to be just visible.
4. Using the numeric buttons shown set each colour to
minimum by decreasing to the point where any further
decrease resets the adjustment to maximum value.
BIAS ADJUSTMENT
5. By using the buttons 1, 2, 4, 5, 7, 8 on the remote
control, adjust the line to be white.
The key allocation is as follows;
Button No. Operation
1
Increase Red
2
Decrease Red
4
Increase Green
5
Decrease Green
7
Increase Blue
8
Decrease Blue
C5KEV
DRIVE ADJUSTMENT
6. Select item no.3 "REGULAR 3, GRY" (G-Drive) or 4
"REGULAR 4, GRY" (B-Drive) and adjust both initially
to 40.
7. Change data value of each item by using LEVEL + or
LEVEL - button to obtain the proper white balance.
-8-
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