Sony TA-VA80ES, Service Manual

Page: 9 / 66

– 9 –
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 volt meter
+
–
1
2
3
R615
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
R768
RV001
R016
R715
RV701
R718
R615
RV601
R618
3
2
1
3 2
1
1
2
3
FRONT Rch
REAR Rch
FRONT Lch
REAR Lch
CENTER
Connecting Adjustment Reading on
point part Digital volt meter
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
SECTION 3
ELECTRICAL ADJUSTMENTS