Pioneer VSX-94TXH Service Manual page 57

5
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Scaler section
Step 5-1: Power supply
Is the voltage
3.3V?
Yes
Is the voltage
3.3V?
Yes
Is the voltage
1.8V?
Yes
Is the voltage
TE 1.8V?
L 13942296513
Yes
Is the voltage
1.8V?
Yes
Is the voltage
3.3V?
Yes
Step 5-2: X'tal, Reset
X1301
Is oscillation
of 13.5 MHz
output?
Yes
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3.3V (Scaler)
O1
No
Check L1302.
No
Replace L1302.
3.3V (Scaler)
O2
No
Check L1303.
No
Replace L1303.
1.8V (Scaler)
O3
No
Check L1301.
No
Replace L1301.
1.8V (Scaler)
O4
No
Check L1304.
No
Replace L1304.
1.8V (Scaler)
O5
No
Check L1305.
No
Replace L1305.
3.3V (SDRAM)
O6
No
Check L1351.
No
Replace L1351.
X'tal
P1
No
Check X1301.
No
Replace X1301 or IC1301.
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IC1301(Pin 47)
Is the voltage
"H"(3.3V)?
Yes
IC1301(Pin 46)
Does
a signal output in
constant period
(0 - 3.3 V)
?
Yes
IC1301(Pin 45)
Does
a clock output in
constant period
(0 - 3.3 V)
?
Yes
Step 5-3: INPUT
IC1301(Pin 4)
Q Q
3 6 7 1 3 1 5
Is there a
CLK?
Yes
IC1301(Pins 29,
32-35,38-40)
Is there a
DATA?
Yes
IC1301(Pins 21-28) P12-19
Is there a
DATA?
Yes
H
co
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VSX-94TXH
7
8
9 4 2 8
XVCRST
P2
No
Check the parts and patterns in
the path(IC501 - IC1301).
Replace IC501.
VCSDA
P2
No
Check the parts and patterns in
the path(IC501 - IC1301).
Replace IC501 or IC1301.
VCSCL
P2
No
Check the parts and patterns in
the path(IC501 - IC1301).
Replace IC501 or IC1301.
LLC
P2
0 5 8 2 9 9 4 2 8
No
Check the parts and patterns in
the path (IC401 - IC1301).
Replace IC401.
P22-29
P2
No Check the parts and patterns in
the path (IC401 - IC1301).
Replace IC401.
*Skip at analog 480i/576i input.
P2
No
Check the parts and patterns in
the path (IC401 - IC1301).
Replace IC401.
m
9 9
A
No
B
No
No
C
9 9
No
D
No
E
No
F
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