Pioneer VSX-03TXH Service Manual page 63

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[2] Protection Circuit Process List (XPROTECT)
Item
AMP power supply circuit and
Transformer short circuit
detect. (defect status)
XPROTECT
Observe CN5701 pin3 or pin5
voltage, VL+ and VL-
XPROTECT Circuit
R
POWER AMP ASSY
CN5701
-3
D5721
1SS352
TE
L 13942296513
B
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Purpose Detection Method
Detects when the XPROTECT
port becomes "L".
(Pin 102 of IC101)
CN5701
-5
Short circuit detect:
Transformer
D5722
1SS352
GAMP
DTC124EUA
MAIN ASSY
V+5US
UCOM
IC101
102
C421
0.047u/25
GNDU
x ao
y
i
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Process
Turns muting on and
speaker relay off, and
immediately turns off the
power. Then flashes
DIGITAL PRECISION
PROCESSING indicator.
Short circuit detect:
AMP power supply circuit (VL)
V+5UM
Q5783
DTA124EUA
Q5782
DTC124EUA
Q Q
3 6 7 1 3
Q5781
GNDU
CN5803
-9
CN4808
-9
E
INTERFACE ASSY
CN4803
-15
CN108
-15
u163
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VSX-03TXH
6
7
2 9 9 4 2 8
Warning Indication
Once detected and turned
the power off, input a key
None
never again.
VL+
V+5UM
Q5784
DTA124EUA
R5784
47k
UDZS7R5(B)
VL-
GNDU
D5782
1 5 0 5 8 2 9 9 4
m
co
7
8
9 9
Remarks
A
B
Q5785
DTC124EUA
C
GNDU
2 8 9 9
D
E
F
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