PRS-D1200SPL/XU/UC
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-
Speaker Output DC Offset Voltage Adjustment
-
VH Voltage Adjustment
No.
Measurement condition
Measurement point
Adjustment point
Adjustment Method
1
Power on
SP OUT
VR801
DC voltmeter : 0 ± 15 mV
No load, no input
Rg = 1 k
Ω
No.
Measurement
Measurement point
Adjustment
Adjustment Method
condition
point
1
Power on
GND : Buss Bar on the center of PCB
VR161 : +VH
DC voltmeter : ± 85.0 V ±1 V
No load, no input
+VH : Drain lead of Q865 or Q866
VR201 : -VH
Rg = 1 k
Ω
-VH : Source lead of Q869 or Q870
-
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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