Pioneer SC-LX81 Service Manual page 40

1
B
A
R0PWR5V
IC101(Pin 35)
No
Is the voltage
5 V?
Yes
Step 3-5: DDC
JA1101 (Pin 16)
B
SDA(HDMI BD IN) *
Does
a signal output in
constant period
(0 - 5 V)
?
Yes
SCL(HDMI BD IN) *
JA1101 (Pin 15)
Does
a clock output in
C
constant period
(0 - 5 V)
?
Yes
RXDSDA1
R108(Pin 5)
Is there
a same signal as SDA
(BD) (0 - 3.3 V)
?
Yes
RXDSCL1
R108(Pin 6)
D
Is there
a same signal as SCL
(BD) (0 - 3.3 V)
?
Yes
SDA(HDMI IN1) *
JA1102 (Pin 16)
Does
E
a signal output in
constant period
(0 - 5 V)
?
Yes
F
40
1
2
* When connected the source
equipment to IN3.
F1
Check the parts and
patterns in the path.
No
Replace D1104.
* When connected the source
equipment to BD IN.
G1
No
Check the patterns in the path.
Check the JA1101.
No
Replace JA1101.
G1
No
Check the patterns in the path.
Check the JA1101.
No
Replace JA1101.
G2
No
Check the patterns in the path.
Check the IC1151(Pins 76,77).
No
Replace IC1151.
G2
No
Check the patterns in the path.
Check the IC1151(Pins 76,77).
No
Replace IC1151.
* When connected the source
equipment to IN1.
G3
No
Check the patterns in the path.
Check the JA1102.
No
Replace JA1102.
2
3
JA1102 (Pin 15)
Does
a clock output in
constant period
(0 - 5 V)
?
Yes
R108(Pin 5)
Is there
a same signal as SDA
(IN1) (0 - 3.3 V)
?
Yes
R108(Pin 6)
Is there
a same signal as SCL
(IN1) (0 - 3.3 V)
?
Yes
JA1103(Pin 16)
Does
a signal output in
constant period
(0 - 5 V)
?
Yes
JA1103(Pin 15)
Does
a clock output in
constant period
(0 - 5 V)
?
Yes
R108(Pin 5)
Is there
a same signal as SDA
(IN2) (0 - 3.3 V)
?
Yes
R108(Pin 6)
Is there
a same signal as SCL
(IN2) (0 - 3.3 V)
?
Yes
C
SC-LX81
3
4
SCL(HDMI IN1)*
G3
No
Check the patterns in the path.
Check the JA1102.
No
Replace JA1102.
RXDSDA1
G2
No
Check the patterns in the path.
Check the IC1151(Pins 76,77).
No
Replace IC1151.
RXDSCL1
G2
No
Check the patterns in the path.
Check the IC1151(Pins 76,77).
No
Replace IC1151.
* When connected the source
equipment to IN2.
SDA(HDMI IN2) *
G4
No
Check the patterns in the path.
Check the JA1103.
No
Replace JA1103.
SCL(HDMI IN2) *
G4
No
Check the patterns in the path.
Check the JA1103.
No
Replace JA1103.
RXDSDA1
G2
No
Check the patterns in the path.
Check the IC1151(Pins 76,77).
No
Replace IC1151.
RXDSCL1
G2
No
Check the patterns in the path.
Check the IC1151(Pins 76,77).
No
Replace IC1151.
4