Pioneer PDP-42A3HD Service Manual page 120

1
Cause/Countermeasure:
2 If the connector CN7709 disconnected from Data Relay Board (RU )is short-circuited between Pin 1 (or 2) and
GND (Pin 3 or 4) ] Data IC is broken
3 If the connector CN7709 disconnected from Data Relay Board (RU) is short-circuited between Pin 5 (or 6) and
A
GND (Pin 3 or 4) ] Data Relay Board (LU) or (RU) is failed ]
a) If the connector CN7608 disconnected from Data Relay Board (LU) is short-circuited between Pin 1
and GND (Pin 2 or 6) ]Data Relay Board (LU) is failed
b) If the connector CN7708 disconnected from Data Relay Board (RU) is short-circuited between Pin 1
and GND (Pin 2 or 6) ]Data Relay Board (RU) is failed
Data Relay Board (LU)
B
CN7608 CN7708 CN7709
C
Cause/ Countermeasure :
4 If the connector CN7909 disconnected from Data Relay Board (RD) is short-circuited between Pin 1 (or 2) and
GND (Pin 3 or 4) ] Data IC is broken ]
5 If the connector CN7909 disconnected from Data Relay Board (RD) is short-circuited between Pin 5 (or 6) and
GND (Pin 3 or 4) ] Data Relay Board (LD) or (RD) is failed ]
a) If the connector CN7808 disconnected from Data Relay Board (LD) is short-circuited between Pin 8
and GND (Pin 3 or 7) ] Data Relay Board (LD) is failed ]
b) If the connector CN7908 disconnected from Data Relay Board (RD) is short-circuited between Pin 8
D
and GND (Pin 3 or 7) ] Data Relay Board(RD) is failed ]
E
CN7808 CN7908 CN7909
Data Relay Board (LD)
F
120
1
2
]Exchange PDP.
Data Relay Board (RU)
Exchange PDP.
Data Relay Board (RD)
PDP-42A3HD
2
3
]Exchange Data Relay Board (LU).
]Exchange Data Relay Board (RU).
Data Relay Board (RU)
CN7709
Exchange Data Relay Board (LD).
Exchange Data Relay Board (RD).
CN7909
Data Relay Board (RD)
3
4
OK: Open
NG: Short
OK: Open
NG: Short
4