Idle Current Adjustment - Pioneer VSX-5231 Service Manual

8.3 IDLE CURRENT ADJUSTMENT

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)
R1SL
1K2
R2SL
470K
560P-50V
Channel
FL
FR
C
SL
SR
• Adjustment points and measurement points.... see fig.1.
G
AMP5 ASSY
VR1FL
VR1FL
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5
R7SL
R8SL 2K7
ZD1SL R6SL
C3SL
1K2
ZJ5.1A 100K
10/50
Q1SL
KTA1024Y
R5SL R9SL
150K
JUMPER
C9SL
47P-100V
C6SL
100P-100V
C4SL R4SL
22/50
1K5
C7SL
47P-100V
Q2SL
KSA992F
C8SL
-
R3SL R12SL
C30SL
C5SL
22K -
82P-50V
C13SL R42SL
2N2-K 270
R41SL
150
R14SL R15SL
1K2(1) JUMPER
C15SL
100P/100V
Measurement
Points
TP1FL pin 1 (+)
TP1FL pin 3 (–)
TP1FR pin 1 (+)
TP1FR pin 3 (–)
TP1C pin 1 (+)
TP1C pin 3 (–)
TP1SL pin 1 (+)
TP1SL pin 3 (–)
TP1SR pin 1 (+)
TP1SR pin 3 (–)
TP1FL VR1SL
VR1SL
TP1FL
5
manuals search engine
6
(SL)
R19SL
C19SL 7K5(1)
47/50
R20SL
7K5(1)
C11SL
R21SL
22P-500V
2K7 Q5SL
R17SL
KTC3964
-
TD03G333FT
R10SL R22SL
33K -
C12SL C17SL
R18SL
100/50
-
-
R11SL
R23SL
-
560
R13SL
1K1
Q4SL
C18SL
KTC3206Y
-
R16SL
47(1)
C16SL
-
Adjustment
Points
1 Turn on the power.
VR1FL
2 Perform aging for one minute.
VR1FR
3 Connect a digital voltmeter to the measurement point.
VR1C
4 Turn the adjustment VR so that the voltage becomes
VR1SL
VR1SR
(Condition : No signal and no load)
TP1SL VR1C
VR1C
TP1SL
Fig.1
VSX-523-K
6
7
DHPTHF1608_471P95T
TP1SL
C21SL
20010WR-03
100P-500V
1 2 3
Q6SL
R24SL 2SD2390
100(1)
ZD2SL
ZJ4.3B
D3SL
R26SL R27SL
1N4148
0R47(2) 0R47(2)
(SL)
R29SL
R28SL
ZD3SL 0R47(2)
0R47(2)
ZJ4.3B
D4SL
1N4148
R25SL
100(1) Q7SL
2SB1560
C22SL
100P-500V
Procedure
in 2.0 mV ± 0.2 mV.
TP1C VR1SR TP1SR
VR1SR
TP1C TP1SR
7
8
A
R33SL
C29SL
100N-K
Q8SL
B
R32SL 390K 2N5401S
R38SL
47K
D5SL
R34SL
R39SL
LBAS16HT1G 22K
270K
R35SL
10K
R37SL
-
Q9SL
R36SL C27SL
- 2SC3052
5K6
C
D
VR1FR TP1FR
TP1FR
VR1FR
E
F
SIDE A
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