Pioneer VSX-1018AH-K Service Manual page 46

1
A
B
Step 4-3: Reset, X'tal
XVCRST
IC501 (Pin 3)
No
Is the voltage
"H"(3.3V)?
Yes
B
XTAL
IC402 (Pin 7)
Is there a CLK No
(28.63636 MHz)
?
Yes
Step 4-4: I2C
VCSDA
IC501 (Pin 30)
C
Does
a signal output in
constant period
(0 - 3.3 V)
?
Yes
VCSCL
IC501 (Pin 29)
Does
a clock output in
constant period
D
(0 - 3.3 V)
?
Yes
Step 4-5: VIDEO CLK, DATA
LLC
IC601 (Pin 48)
No
Is there a
CLK?
E
Yes
P22-P29
IC601 (Pins 2-9)
No
Is there a
DATA?
Yes
F
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1
2
C
Check the parts and patterns in
the path(IC501 - IC401).
No
Replace IC501.
J
Check the X401 or IC402.
No
Replace X401 or IC402.
C
No
Check the parts and patterns in
the path(IC501 - IC401,601).
No
Replace IC501, IC401 or IC601.
C
No
Check the parts and patterns in
the path(IC501 - IC401,601).
No
Replace IC501, IC401 or IC601.
K
Check the parts and patterns in
the path(IC401 - IC1601).
No
Replace IC401.
K
Check the parts and patterns in
the path(IC401 - IC601).
No
Replace IC401.
2
3
Step 4-6: VIDEO OUTPUT
IC601 (Pin 35)
Is there a
composite
signal?
Yes
Q631 (E)
Is there a
composite
signal?
Yes
Diagnose the MAIN Assy.
VSX-LX51
3
4
DAC A *Only 480i/576i input.
K
No
Check the IC601.
No
Replace IC601.
CVBS OUT
L1
No
Check the parts and patterns in
the path(IC601 - CN1002).
No
Replace L631, Q631 or the
peripheries of L631 or Q631.
4