Pioneer VSX-94TXH Service Manual page 54

1
Video converter section
QQ
3 7 63 1515 0
Step 4-1: Power supply
A
3.3V(VIDEO DEC)
Yes
V+3DE
No
Is the voltage
3.3V?
Yes
3.3V(VIDEO DEC)
No
Is the voltage
3.3V?
B
Yes
3.3V(IC402)
No
Is the voltage
3.3V?
Yes
3.3V(VIDEO DEC)
C
No
Is the voltage
3.3V?
Yes
TE
L 13942296513
3.3V(VIDEO ENC)
No
Is the voltage
3.3V?
Yes
D
3.3V(VIDEO ENC)
No
Is the voltage
3.3V?
Yes
1.8V(VIDEO DEC)
V+1R8DE
No
Is the voltage
1.8V?
E
Yes
1.8V(VIDEO DEC)
Is the voltage
www
1.8V?
Yes
F
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Check the patterns in the path
(Check L401).
No
Replace L401.
K1
Check the patterns in the path
(Check L404).
No
Replace L404.
K2
Check the patterns in the path
(Check L405).
No
Replace L405.
K3
Check the patterns in the path
(Check L406).
No
Replace L406.
K4
Check the patterns in the path
(Check L601).
No
Replace L601.
K5
Check the patterns in the path
(Check L602).
No
Replace L602.
Check the patterns in the path
(Check L402).
No
Replace L402.
K6
No
Check the patterns in the path
(Check L403).
No
x ao
y
Replace L403.
. i
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8
Step 4-2: VIDEO INPUT
CN1002(Pin 24)
Is there a
composite
signal?
Yes
CN1002(Pin 20)
Is there a
Y signal?
Yes
CN1002(Pin 18)
Is there a
C signal?
Yes
CN1002(Pin 12)
Q Q
3 6 7
Is there a
Y signal?
Yes
CN1002(Pin 10)
Is there a
Pb signal?
Yes
CN1002(Pin 8)
Is there a
Pr signal?
Yes
Step 4-3: Reset
IC401(Pin 83)
Is the voltage
"H"(3.3V)?
u163
Yes
G
VSX-94TXH
3
4
2 9 9 4
VCV IN
A2
No
Diagnose the INTERFACE Assy
or COMPOSITE_V Assy
VCY IN
A2
No
Diagnose the INTERFACE Assy
or S-VIDEO Assy
VCC IN
A2
No
Diagnose the INTERFACE Assy
or S-VIDEO Assy
VCCY IN
A2
No
1 3 1 5 0 5 8 2 9
Diagnose the INTERFACE Assy
or COMPONENT & VOL Assy
VCCb IN
A2
No
Diagnose the INTERFACE Assy
or COMPONENT & VOL Assy
VCCr IN
A2
No
Diagnose the INTERFACE Assy
or COMPONENT & VOL Assy
XVCRST(DEC)
L1
No
m
Check the parts and patterns in
the path(IC501 - IC401).
co
Replace IC501.
.
4
2 8
9 9
9 4 2 8 9 9
No