Amp Assy; C 8.3 Idle Current Adjustment - Pioneer VSX-821-K Service Manual

5
8.3 IDLE CURRENT ADJUSTMENT
for VSX-821-K, VSX-521-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)
Measurement
Channel
Points
TP401 pin 1 (+)
FL
TP401 pin 3 (–)
TP402 pin 1 (+)
FR
TP402 pin 3 (–)
TP403 pin 1 (+)
C
TP403 pin 3 (–)
TP404 pin 1 (+)
SL
TP404 pin 3 (–)
TP405 pin 1 (+)
SR
TP405 pin 3 (–)
• Adjustment points and measurement points.... see fig.1.
C

AMP ASSY

FL_VR401 FL_TP401
5
6
(SL)
Adjustment
Points
VR401
VR402
VR403
VR404
VR405
SL_VR404 C_VR403
SL_TP404
6
7
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
C_TP403
Fig.1
VSX-821-K
7
8
Procedure
FR_VR402
SR_TP405 FR_TP402
SIDE A
8
A
B
(SL)
C
D
E
F
67