Idle Current Adjustment - Pioneer VSX-1022-K Service Manual

5

8.3 IDLE CURRENT ADJUSTMENT

for VSX-1022-K, VSX-42
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)
C409
C405 100P-J
C540
R427 C408 R428
22/50
1K2
1K5
Q407
KSA992F
C413 R440
2N2-K
Measurement
Channel
Points
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
TP405 pin 3 (–)
TP406 pin 1 (+)
SBL
TP406 pin 3 (–)
TP407 pin 1 (+)
SBR
TP407 pin 3 (–)
• Adjustment points and measurement points.... see fig.1.
B
AMP7 ASSY
SL_VR401 FL_VR404
SL_TP401 FL_TP404
5
6
(SL)
R401
1K2
Q401
KTA1024Y
C406
-
220P-500V
-
R429
Q408 33K
KSA992F
C410
100/50
R434
3K3(1)
Q412
R710
150 270 KTC3206Y
C435
-
C525 -
Adjustment
Points
VR404
VR402
VR403
VR401
VR405
VR406
VR407
C_VR403 SR_VR405
C_TP403
6
7
C404
47/50
Q404
R415
2SD2390
100(1)
Q409 ZD402
MTZ4.3B
KTC3964
D403
R424
1SS133T
0R47(2)
R430
ZD403
0R47(2)
MTZ4.3B
D404
1SS133T
R439
Q410
100(1)
2SB1560
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)
FR_VR402
SR_TP405 FR_TP402
Fig.1
VSX-1022-K
7
8
R406
PRF18BC471QB5RB
TP401
20010WR-03
R411
1 2 3
Q403
2N5401S
150K
R417
D402
270K
1SS133T R423
Q406
10K
2N5551S
R425
0R47(2)
(SL)
R431
0R47(2)
Procedure
SIDE A
SBL_VR406 SBR_VR407
SBL_TP406 SBR_TP407
8
A
R412 47K
B
R416 22K
R419 22K
C
D
E
F
69