Pioneer VSX-94TXH Service Manual page 55

5
QQ
G
3 7 63 1515 0
IC601(Pin 44)
Is the voltage
"H"(3.3V)?
Yes
IC401(Pin 80)
Is there CLK
(28.63636 MHz)
?
Yes
Step 4-4: I2C
R425
Does
a signal output in
constant period
(0 - 3.3 V)
?
Yes
R426
Does
a clock output in
constant period
TE
L 13942296513
(0 - 3.3 V)
?
Yes
Step 4-5: VIDEO CLK,DATA
IC1381(Pin 5)
Is there a
CLK?
Yes
IC1384(Pins 2-9)
Is there a
DATA?
Yes
IC1383(Pins 2-9)
Is there a
DATA?
www
Yes
.
5
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6
XVCRST(ENC)
L2
No
Check the parts and patterns in
the path(IC501 - IC601).
No
Replace IC501.
XTAL
L1
No
Check X401 or IC402.
No
Replace X401 or IC402.
VCSDA
M1
No
Check the parts and patterns in
the path(IC501 - IC401,601).
No
Replace IC501 or IC401 or IC601.
VCSCL
M2
No
Check the parts and patterns in
the path(IC501 - IC401,601).
No
Replace IC501 or IC401 or IC601.
LLC
N1
No
Check the parts and patterns in
the path(IC401 - IC1381).
No
Replace IC401.
P22-P29
N2
No
Check the parts and patterns in
the path(IC401 - IC1382).
No
Replace IC401.
P12-19 *Only
480p/576p/720p/1080i input
N3
No
Check the parts and patterns in
the path(IC401 - IC1383).
No
x ao u163
y
Replace IC401.
i
6
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7
2 9
8
IC1381(Pins 6-9)
Is there a
DATA?
Yes
IC601(Pin 48)
Is there a
CLK?
Yes
IC601(Pins 2-9)
Is there a
DATA?
Yes
Step 4-6: VIDEO OUTPUT
Q Q
3 6 7 1 3 1 5
IC601(Pin 35)
Is there a
composite
signal?
Yes
CN1002(Pin 22)
Is there a
composite
signal?
Yes
Diagnose the INTERFACE Assy
or COMPOSITE_V Assy.
co
.
VSX-94TXH
7
8
9 4 2 8
P11, P20, P21
N1
No
Check the parts and patterns in
the path(IC401 - IC1381).
Replace IC1381.
LLC *Only 480i/576i input
L2
No
Check the parts and patterns in
the path(IC401 - IC601).
Replace IC401.
P22-29 *Only 480i/576i input
L2
No
Check the parts and patterns in
the path(IC401 - IC601).
Replace IC401.
0 5 8 2 9 9 4 2 8
*Only 480i/576i input
DAC A
L2
No
Check IC601.
Replace IC601.
CVBS OUT
A2
No
Check the parts and patterns in
the path(IC601 - IC1002).
Replace L631, Q631 or the
peripheries of L631 or Q631.
m
9 9
A
No
B
No
No
C
9 9
No
D
No
E
F
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