Pioneer VSX-818V-K, Service Manual

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46
VSX-918V-K
1 2 3 4
A
B
C
D
E
F
1 2 3 4
D713
1SS133
Q702
2SA2005(E)
Q701
2SC5511(E)
D+5 V
V oltage supply
to PO W ER AMP IC
( V neck-)
V oltage supply
to PO W ER AMP IC
( V neck+)
R697
10k
R69 8
33k
R713
1k
R 8 07
10k
D 8 01
S1 W B(A)60SD
D 8 07
D 8 06
MTZJ6.2B
Q 8 07(2/2)
Q 8 07(1/2)
Q 8 0 8 (1/2)
D+5.6 V
Q 8 0 8 (2/2)
Q69 8
V oltage supply
to +12 V
REGULATOR IC
V oltage supply
to -12 V
REGULATOR IC
C 8 06
1/50
C 8 01
2200
/25
C 8 02
2200
/25 R 8 06
10k
R 8 0 8
1k
IC9001
(U-P)
XPROTECT
4. XPROTECT Detection Circuit Diagram
W hen below 6 kind of voltage supply become to
be short circuit to G N D, XPROTECT circuit work
and U-P input port voltage change from +5 V to 0 V .
The U-P detect this condition as ERROR.
•
V oltage supply to PO W ER AMP IC ( V neck+)
• V oltage supply to PO W ER AMP IC ( V neck-)
• V oltage supply to +12 V REGULATOR IC
• V oltage supply to -12 V REGULATOR IC
POWER PACK ASSY
MAIN ASSY
8 9
C
A