5-1
VPH-G90E/G90U/G90M
SECTION 5
CIRCUIT ADJUSTMENTS
Perform this section only when the components of each
board have been replaced. When the completed board had
been replaced, the following adjustments will not be
required.
5-1. POWER BLOCK
5-1-1. DC (
+
+
+
+
+
) Adjustment
1. Remove the GA board, and connect it back through the
extension board.
2. Connect a digital voltmeter to pin 1 and pin 3 of CN11
of the GA board.
3. Adjust RV101 on the GAA board of CN14 side so that
the voltage becomes the following specification.
Specification: 375
±
2 V
4. Connect a digital voltmeter to pin 6 and pin 4 of CN11
of the GA board.
5. Adjust RV101 on the GAA board of CN15 side so that
the voltage becomes the following specification.
Specification: 375
±
2 V
5-1-2.
+
+
+
+
+
115 V Adjustment
1. Remove the GB board, and connect it back through the
extension board.
2. Connect a digital voltmeter to pin 2 and pin 6 of CN34
of the GB board.
3. Adjust RV403 on the GBB board so that the voltage
becomes the following specification.
Specification: 116
±
0.5 V
5-1-3.
+
+
+
+
+
200 V Adjustment
1. Remove the GB board, and connect it back through the
extension board.
2. Connect a digital voltmeter to pin 1 and pin 6 of CN34
of the GB board.
3. Adjust RV404 on the GBB board so that the voltage
becomes the following specification.
Specification: 200
±
1.0 V
5-1-4. Oscillating Frequency Adjustment
1. Remove the GB board, and connect it back through the
extension board.
2. Connect a frequency counter to the gate terminal of Q6
of the GB board.
3. Adjust RV201 on the GBA board so that the frequency
becomes the following specification.
Specification: 85
±
2 kHz
4. Connect a frequency counter to the gate terminal of
Q10 of the GB board.
5. Adjust RV202 on the GBA board so that the frequency
becomes the following specification.
Specification: 95
±
2 kHz
6. Connect a frequency counter to the gate terminal of Q8
of the GB board.
7. Adjust RV402 on the GBB board so that the frequency
becomes the following specification.
Specification: 85
±
2 kHz
8. Connect a frequency counter to the gate terminal of
Q12 of the GB board.
7. Adjust RV401 on the GBB board so that the frequency
becomes the following specification.
Specification: 100
±
2 kHz
Summary of Contents for VPH-G90E
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Page 122: ...2 2 VPH G90E G90U G90M 2 1 3 Location 3 ME MB MC PB M L MA BA F BC NA BB ...
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Page 337: ...9 1 9 1 VPH G90E G90U G90M SECTION 9 BLOCK DIAGRAMS ...
Page 363: ...2 3 4 5 A B C D E F G H 1 10 1 10 1 VPH G90J G90E G90U G90M SECTION 10 DIAGRAMS ...
Page 437: ...2 3 4 5 A B C D E F G H 1 10 75 10 75 VPH G90J G90E G90U G90M ...
Page 474: ...2 3 4 5 A B C D E F G H 1 10 112 10 112 VPH G90J G90E G90U G90M ...