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Electrical Adjustments
Circuit Adjustments
CAUTION: The each circuit has been made by the fine adjustment at factory. Do not attempt to adjust the follow-
ing adjustments except requiring the readjustments in servicing otherwise it may cause loss of perfor-
mance and product safety.
[Adjustment Condition]
Input signal
Video signal -------------- 1.0Vp-p/75Ω terminated, 16 steps gray scale or color bar pattern
Computer signal -------- 0.7Vp-p/75Ω terminated, 16 steps gray scale pattern
Picture control mode ---------- "NORMAL" mode unless otherwise noted.
OUTPUT VOLTAGE ADJUSTMENT
After replacing the Power Board, readjust the Output
voltage adjustment as follows.
1. Connect a digital voltmeter to pins 1 (+) and 3 (-) of
K6D.
2. Adjust the voltage by using VR671 as following.
AC Input
230V
120V
Caution:
Be sure to connect the lamp when taking this adjust-
ment.
+6V ADJUSTMENT
1. Receive the 16-step gray scale video signal.
2. Set to AV mode.
3. Connect a digital voltmeter to pin 5 (+) of K6E and
chassis ground (-).
4. Adjust voltage to 6.2 ±0.1V by using VR662.
+15V ADJUSTMENT
1. Receive the 16-step gray scale video signal.
2. Set to AV mode.
3. Connect a digital voltmeter to pin 5 (+) of K6E and
chassis ground (-).
4. Adjust voltage to 15.6 ±0.1V by using VR661.
+12V ADJUSTMENT
1. Receive the 16-step gray scale video signal.
2. Set to AV mode.
3. Connect a digital voltmeter to pin 5 (+) of K6J and
chassis ground (-).
4. Adjust voltage to 12.0 ±0.1V by using VR681.
Reading
370V ±2V
320V ±2V
DVCO ADJUSTMENT
1. Receive the NTSC color bar video signal.
2. Set to AV mode.
3. Select Data no. "030" and change data value (Refer to
"IIC data adjustment ") upward or downward. Confirm
that the data value automatically change and stay a
certain value.
DC ADJUSTMENT
Presetting
1. Receive the 16-step gray scale computer signal.
2. Set to COMPUTER mode.
[R-DC ADJUSTMENT]
3. Connect a digital voltmeter to test point "TP2511" (+)
and chassis ground (-).
4. Select Data no. "000" and change data value (Refer to
"IIC data adjustment ") to adjust voltage to 7.5 ±0.1V.
[G-DC ADJUSTMENT]
5. Connect a digital voltmeter to test point "TP2512" (+)
and chassis ground (-).
6. Select Data no. "001" and change data value (Refer to
"IIC data adjustment ") to adjust voltage to 7.5 ±0.1V.
[B-DC ADJUSTMENT]
7. Connect a digital voltmeter to test point "TP513" (+)
and chassis ground (-).
8. Select Data no. "002" and change data value (Refer to
"IIC data adjustment ") to adjust voltage to 7.5 ±0.1V.
-29-
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