Pioneer PRS-D1200SPL Service Manual page 19

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- Speaker Output DC Offset Voltage Adjustment
3 7 63 1515 0
No. Measurement condition
1 Power on
No load, no input
Rg = 1 kΩ
- VH Voltage Adjustment
No. Measurement
condition
1 Power on
No load, no input
Rg = 1 kΩ
- Cautions for Voltage Adjustment
Speaker Output DC Offset Voltage Adjustment and VH Voltage Adjustment affect each other.
So, after adjusting either voltage, check the other voltage.
If the voltage is within limits, it is OK.
If the voltage is out of limits, adjust the voltage and check the other voltage again (or repeatedly in some cases).
e.g. Offset → ±VH → Offset → ±VH → Offset
Rough adjustment of VR center is permissible, so check the offset at first and last.
Note: When connecting or adjusting the lead, be careful not to short-circuit it with other portions.
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Measurement point
SP OUT
Measurement point
GND : Buss Bar on the center of PCB
+VH : Drain lead of Q865 or Q866
-VH : Source lead of Q869 or Q870
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Adjustment point Adjustment Method
VR801 DC voltmeter : 0 ± 15 mV
Adjustment
point
VR161 : +VH
VR201 : -VH
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PRS-D1200SPL/XU/UC
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Adjustment Method
DC voltmeter : ± 85.0 V ±1 V
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B
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