Idle Current Adjustment - Pioneer VSX-523-K Service Manual

5

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)
ZD1SL R6SL
C3SL
ZJ5.1A 100K
10/50
R5SL
150K
C9SL
47P-100V
100P-100V
R1SL C4SL R4SL
1K2 22/50
1K5
Q2SL
KSA992F
R2SL R3SL
C30SL
C5SL
470K 22K
82P-50V
C13SL
560P-50V
2N2-K
R14SL
1K2(1)
C15SL
100P/100V
Measurement
Channel
Points
TP1FL pin 1 (+)
FL
TP1FL pin 3 (–)
TP1FR pin 1 (+)
FR
TP1FR pin 3 (–)
TP1C pin 1 (+)
C
TP1C pin 3 (–)
TP1SL pin 1 (+)
SL
TP1SL pin 3 (–)
TP1SR pin 1 (+)
SR
TP1SR pin 3 (–)
• Adjustment points and measurement points.... see fig.1.
G
AMP5 ASSY
VR1FL TP1FL
VR1FL
TP1FL
5
6
(SL)
R7SL
R8SL 2K7
1K2
Q1SL
KTA1024Y
R9SL
JUMPER
C11SL
22P-500V
C6SL
R17SL
-
TD03G333FT
C7SL
47P-100V
R10SL
33K
C8SL
C12SL C17SL
- R18SL
100/50
-
-
R11SL
-
R12SL R13SL
- 1K1
R42SL
270
Q4SL
R41SL
C18SL
KTC3206Y
150
-
R15SL
R16SL
JUMPER
47(1)
C16SL
-
Adjustment
Points
VR1FL
VR1FR
VR1C
VR1SL
VR1SR
VR1SL TP1SL VR1C
VR1SL
VR1C
TP1SL
6
7
R19SL
C19SL 7K5(1)
47/50
C21SL
100P-500V
R20SL
7K5(1)
Q6SL
R24SL 2SD2390
100(1)
R21SL
ZD2SL
2K7 Q5SL
ZJ4.3B
KTC3964
D3SL
R26SL
1N4148
0R47(2)
R22SL
-
R28SL
ZD3SL
0R47(2)
ZJ4.3B
R23SL
D4SL
560
1N4148
R25SL
100(1)
Q7SL
2SB1560
C22SL
100P-500V
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)
TP1C VR1SR
VR1SR
TP1C
Fig.1
VSX-523-K
7
8
R33SL
C29SL
DHPTHF1608_471P95T
100N-K
TP1SL
20010WR-03
1 2 3
Q8SL
R32SL 390K 2N5401S
R38SL
D5SL
R34SL
R39SL
LBAS16HT1G
270K
R35SL
10K
R37SL
-
R27SL
Q9SL
R36SL C27SL
0R47(2) (SL)
-
2SC3052
5K6
R29SL
0R47(2)
Procedure
TP1SR VR1FR
VR1FR
TP1SR
SIDE A
8
A
B
47K
22K
C
D
TP1FR
TP1FR
E
F
43