5-8
VPH-G90E/G90U/G90M
5-4-17. D/A Converter Offset Adjustment
(DD Board)
1. Pull out the DB board, then inset the extension board
instead. Short-circuit pins B32 and C32 of the
extension board’s connector with a jumper wire.
2. Short-circuit both ends of capacitors C136 and C342 on
the DD board with a jumper wires respectively.
3. Turn on the power.
4. Adjust RV301 so that the voltage at pin-A5 of CN211
is 0
±
0.01 Vdc.
5. Adjust RV302 so that the voltage at pin-A3 of CN211
is 0
±
0.01 Vdc.
6. Adjust RV303 so that the voltage at pin-A1 of CN211
is 0
±
0.01 Vdc.
7. Adjust RV304 so that the voltage at pin-A11 of CN211
is 0
±
0.01 Vdc.
8. Adjust RV305 so that the voltage at pin-A9 of CN211
is 0
±
0.01 Vdc.
9. Adjust RV306 so that the voltage at pin-A7 of CN211
is 0
±
0.01 Vdc.
5-4-12. HS
x
x
x
x
x
VS Waveform Adjustment
(DB Board)
1. Input the signal of its frequency is 64 kHz.
2. Set the data value of H SIZE COARSE to “250.”
3. Set the data value of V SIZE COARSE to “180.”
4. Connect an oscilloscope to TP601.
5. Adjust RV601 so that A section of a waveform become
even as shown in the figure.
6. Adjust RV602 so that A section is 0 V.
5-4-13. HP
x
x
x
x
x
VS Waveform Adjustment
(DB Board)
1. Input the signal of its frequency is 64 kHz.
2. Set the data value of H SIZE COARSE to “250.”
3. Set the data value of V SIZE COARSE to “180.”
4. Connect an oscilloscope to TP602.
5. Adjust RV603 so that A section of a waveform become
even as shown in the figure.
A
6. Adjust RV604 so that A section is 0 V.
5-4-14. B KEY Waveform Adjustment
(DB Board)
1. Input the signal of its frequency is 64 kHz.
2. Set the data value of H SIZE COARSE to “250.”
3. Set the data value of V SIZE COARSE to “180.”
4. Connect an oscilloscope to TP502.
5. Adjust RV502 so that A section is 0 V.
A
B
+
_
A
5-4-15. T KEY Waveform Adjustment
(DB Board)
1. Input the signal of its frequency is 64 kHz.
2. Set the data value of H SIZE COARSE to “250.”
3. Set the data value of V SIZE COARSE to “180.”
4. Connect an oscilloscope to TP501.
5. Adjust RV501 so that A section is 0 V.
A
5-4-16. 1/2H Switching Waveform Adjustment
(DA/DB Boards)
1. Input the signal of its frequency is 15 kHz.
2. Connect an oscilloscope to TP501 on the DB board.
3. Adjust RV303 on the DA board so that the switching
point (A) coincides with 0V cross-point as shown in the
figure.
B
A
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 ...
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