Pioneer PDP-42A3HD Service Manual page 86

1
13. Key
Key switch is OK but the key does not function
A
Preliminary Checkpoints
Check the Solder state and pin of Connector JP10
Check the Solder state in Key Board.
Check the I2C between Micom and EEPROM.
Check the Flash Memory or SDRAM.
B
C
D
E
F
T13
86
1
2
Control key is O.K. but
the Function does not
operate.
OK
Waveform 26
Check the key1,key2
(Pin 124,125)
of IC SDA6001(U29)
OK
Check the Micom part
(IIC Comunication, other
Control line)
OK
Check IR processor
(UP1)
OK
Exchange the Digital Board
2
3
NG
Check Control Key Board
and Power in LED Board
NG
NG
PDP-42A3HD
3
4
Exchange the IC(U29)
Exchange the IC(UP1)
4
T13