Sony STR-DA9000ES - Fm Stereo/fm-am Receiver Service Manual page 8

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