Sanyo PLC-EF12B, Service Manual

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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 Reading
230V 370V ±2V
120V 320V ±2V
Caution:
Be sure to connect the lamp when taking this adjust-
ment.
1. Receive the 16-step gray scale video signal.
2. Set to VIDEO mode.
3. Connect a digital voltmeter to pin 2 (+) of K6E and
chassis ground (-).
4. Adjust voltage to 6.2 ±0.1V by using VR662.
1. Receive the 16-step gray scale video signal.
2. Set to VIDEO 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.
[FAN A ADJUSTMENT]
1. Connect a digital voltmeter to test point “TP7601” (+)
and chassis ground (-).
2. Enter to the service mode, select data no. “17F” and
change data value to adjust voltage to 12.5Vdc
±0.05V, and select data no. “182” and change data
value to adjust voltage to 12.8Vdc ±0.05V.
FAN VOLTAGE ADJUSTMENT
+15V ADJUSTMENT
+6V ADJUSTMENT
OUTPUT VOLTAGE ADJUSTMENT
●
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/75
Ω
terminated, 16 steps gray scale or color bar pattern
Computer signal -------- 0.7Vp-p/75
Ω
terminated, 16 steps gray scale pattern
●
Picture control mode ---------- “NORMAL” mode unless otherwise noted.
Note: Please refer to “Service Adjustment” for entering to the service mode and adjusting the service data.
Electrical Adjustments
1. Receive the NTSC color bar video signal.
2. Set to VIDEO mode.
3. Enter to the service mode, select data no. “030” and
change data value upward or downward. Confirm that
the data value automatically change and stay a cer-
tain value.
DVCO 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. Enter to the service mode, select data no. “000” and
change data value to adjust voltage to 7.5 ±0.1V.
[G-DC ADJUSTMENT]
5. Connect a digital voltmeter to test point “TP2512” (+)
and chassis ground (-).
6. Enter to the service mode, select data no. “001” and
change data value to adjust voltage to 7.5 ±0.1V.
[B-DC ADJUSTMENT]
7. Connect a digital voltmeter to test point “TP2513” (+)
and chassis ground (-).
8. Enter to the service mode, select data no. “002” and
change data value to adjust voltage to 7.5 ±0.1V.
DC ADJUSTMENT
[FAN B ADJUSTMENT]
3. Connect a digital voltmeter to test point “TP7603” (+)
and chassis ground (-).
4. Select data no. “181” and change data value to adjust
voltage to 9.0Vdc ±0.05V, and select data no. “184”
and change data value to adjust voltage to 12.0Vdc
±0.05V.