Pioneer VSX-821-K Service Manual page 68

1
A
for VSX-921-K
When any component parts which are within the red square on the following circuit diagram are replaced, the idle current
adjustment of that channel is required. (Idle current adjustment for another channel is not required.)
However, when any capacitors are replaced, the adjustment is not required.
(The following circuit diagram is for SL channel, but another channel also has same circuit diagram and same adjustment is
required)
B
(SL)
C
Measurement
Channel
TP404 pin 1 (+)
FL
TP404 pin 3 (–)
TP402 pin 1 (+)
FR
TP402 pin 3 (–)
TP403 pin 1 (+)
C
TP403 pin 3 (–)
TP401 pin 1 (+)
SL
TP401 pin 3 (–)
TP405 pin 1 (+)
SR
D TP405 pin 3 (–)
TP406 pin 1 (+)
SBL
TP406 pin 3 (–)
TP407 pin 1 (+)
SBR
TP407 pin 3 (–)
• Adjustment points and measurement points.... see fig.2.
B
AMP ASSY
SL_VR401 FL_VR404
E
F
SL_TP401
68
1
2
Adjustment
Points Points
VR404
VR402
VR403
VR401
VR405
VR406
VR407
C_VR403
FL_TP404 C_TP403
2
3
(SL)
1 Turn on the power.
2 Perform aging for one minute.
3 Connect a digital voltmeter to the measurement point.
4 Turn the adjustment VR so that the voltage becomes
in 2.0 mV ± 0.2 mV.
(Condition : No signal and no load)
SR_VR405 FR_VR402
SR_TP405 FR_TP402
Fig.2
VSX-821-K
3
4
Procedure
SIDE A
SBL_VR406 SBR_VR407
SBL_TP406 SBR_TP407
4