Pioneer SC-LX81 Service Manual page 45

5
Video converter section
Step 4-1: Power supply
3.3V(VIDEO DEC)
L401
V+3DE
No
Is the voltage
3.3V?
Yes
3.3V(VIDEO DEC)
L404
K1
No
Is the voltage
3.3V?
Yes
3.3V(IC402)
L405
K2
No
Is the voltage
3.3V?
Yes
3.3V(VIDEO DEC)
L406
K3
No
Is the voltage
3.3V?
Yes
3.3V(VIDEO ENC)
L601
K4
No
Is the voltage
3.3V?
Yes
3.3V(VIDEO ENC)
L602
K5
No
Is the voltage
3.3V?
Yes
1.8V(VIDEO DEC)
L402
V+1R8DE
No
Is the voltage
1.8V?
Yes
5
6
Check the patterns in the path
Check the L401.
No
Replace L401.
Check the patterns in the path
Check the L404.
No
Replace L404.
Check the patterns in the path
Check the L405.
No
Replace L405.
Check the patterns in the path
Check the L406.
No
Replace L406.
Check the patterns in the path
Check the L601.
No
Replace L601.
Check the patterns in the path
Check the L602.
No
Replace L602.
Check the patterns in the path
Check the L402.
No
Replace L402.
6
7
L403
Is the voltage
1.8V?
Step 4-2: VIDEO INPUT
CN6009(Pin 24)
Is there a
composite
signal?
Yes
CN6009(Pin 20)
Is there a
Y signal?
Yes
CN6009(Pin 18)
Is there a
C signal?
Yes
CN6009(Pin 12)
Is there a
Y signal?
Yes
CN6009(Pin 10)
Is there a
Pb signal?
Yes
CN6009(Pin 8)
Is there a
Pr signal?
Yes
G
SC-LX81
7
8
1.8V(VIDEO DEC)
K6
No
Check the patterns in the path
Check the L403.
No
Replace L403.
*CN6009 is on
COMPNENT ASSY.
COMPOSITE IN
L1
No
Diagnose the COMPOSITE S
Assy
SY IN
L1
No
Diagnose the COMPOSITE S
Assy
SC IN
L1
No
Diagnose the COMPOSITE S
Assy
COMPONENT Y IN
L1
No
Diagnose the COMPONENT
Assy
COMPONENT Cb IN
L1
No
Diagnose the COMPONENT
Assy
COMPONENT Cr IN
L1
No
Diagnose the COMPONENT
Assy
8
A
B
C
D
E
F
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