Read Sony STR-DA90ESG Service Manual online
– 8 –
DC BIAS CURRENT Adjustment
(with no signal input)
(with no signal input)
Note:
1.
1.
DC BIAS CURRENT adjustments should be made 30 seconds after
the [POWER] switch is turned on (POWER ON).
the [POWER] switch is turned on (POWER ON).
2.
After replacing the power transistors, DC BIAS CURRENT adjustments
should be perfomed.
should be perfomed.
Procedure:
Digital voltmeter
+
–
1
2
3
R615
R665
R016
R715
R765
R665
R016
R715
R765
AMP BOARD
[AMP BOARD] (COMPONENT SIDE)
R665
RV651
1
2
3
D973
D971
D972
C987
C988
C985
C986
1
2
3
R668
R765
RV751
R017
RV001
R016
R715
RV701
R718
R615
RV601
R618
3
2
1
3
2
1
2
3
FRONT Rch
REAR Rch
FRONT Lch
REAR Lch
CENTER
R768
1
Connecting
Adjustment
Reading on
point
part
Digital voltmeter
FRONT Lch
R615
RV601
20 mV
FRONT Rch
R665
RV651
20 mV
CENTER
R016
RV001
20 mV
REAR Lch
R715
RV701
20 mV
REAR Rch
R765
RV751
20 mV
AMPLIFIRE SECTION
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