Pioneer VSX-1018AH-K, Service Manual

Page: 54 / 187

54
VSX-LX51
1 2 3 4
A
B
C
D
E
F
1 2 3 4
Diagnose the MAIN Assy.
Diagnose the MAIN Assy.
Diagnose the MAIN Assy.
Diagnose the MAIN Assy.
CN102 (Pin 18)
VCC IN
Is there a
C signal?
No
Yes
CN102 (Pin 12)
VCCY IN
Is there a
Y signal?
No
Yes
CN102 (Pin 10)
VCCb IN
Is there a
Pb signal?
No
Yes
CN102 (Pin 8)
VCCr IN
Is there a
Pr signal?
No
Yes
C
B
Yes
Check the X401 or IC402.
No
Replace X401 or IC402.
IC402 (Pin 7)
XTAL
J
No Is there a CLK
(28.63636 MHz)
?
Step 4-3: Reset, X'tal
IC501 (Pin 3)
XVCRST
C
Is the voltage
"H"(3.3 V)?
No
Check the parts and patterns in
the path(IC501 - IC401).
No
Replace IC501.
Yes
Step 4-4: I2C
IC501 (Pin 30)
VCSDA
C
No
Check the parts and patterns in
the path(IC501 - IC401,601).
No
Replace IC501, IC401 or IC601.
Yes
IC501 (Pin 29)
VCSCL
C
No
Check the parts and patterns in
the path(IC501 - IC401,601).
No
Replace IC501, IC401 or IC601.
Yes
Step 4-5: VIDEO CLK, DATA
IC501 (Pin 4)
XVCOE
C
Is the voltage
"L"(0 V)?
No
Check the parts and patterns in the
path(IC501 - (IC1256 - IC1259)).
No
Replace IC501.
Yes
IC1259 (Pin 2)
LLC
K
Is there a
CLK?
No
Check the parts and patterns in
the path(IC401 - IC1259).
No
Replace IC401.
Yes
R428
P26-P29
L2
R429
P22-P25
L1
Is there a
DATA?
No
Check the parts and patterns in
the path(IC401 - IC1257).
No
Replace IC401.
Is there a
DATA?
No
Check the parts and patterns in
the path(IC401 - IC1257).
No
Replace IC401.
Yes
Yes
Does
a clock output in
constant period
(0 - 3.3 V)
?
Does
a signal output in
constant period
(0 - 3.3 V)
?