Pioneer PDU-50WX2 Service Manual page 70

PDU-50WX2
Block Diagram of Shut Down Signal System
INTERFACE ASSY
Note: 1 - 4 show LED flashing number of times when shut down occurred in this route.
Shut down diagnosis
1 Panel microcomputer NG
When a module microcomputer failed in communication with a panel
microcomputer, this NG occurs.
Abnormality to expect
Open / Short of communication line in the Assy
2 DIGITAL-IIC communication NG
When a module microcomputer failed in communication with outside
EEPROM or EXPANDER, this NG occurs.
* However, this communication NG may occur in the standby state.
Abnormality to expect
• Open / Short of communication line in the Assy
• Breaking of wire between DIGITAL VIDEO Assy (D1) and SW POWER
SUPPLY Module (P2).
3 Dew drop detection
When it becomes the dew drop state in this unit, this NG occurs.
Abnormality to expect for dew drop
Disconnect a connector CN2002 between Dew drop sensor and Y DRIVE Assy.
4 Temperature abnormality
• Disconnect a connector between DIGITAL VIDEO Assy (D18) and
temperature sensor 1 (TE1).
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DIGITAL VIDEO ASSY
IC1101
Panel UCOM
TXD
CLK
RXD
1
*PU_CE
BUSY
REQ_PU
D3
TEMP1
IC1207
Module UCOM DEW_DET
SCL
SDA
SW POWER SUPPLY
MODULE
Expander
IC1191
Panel UCOM
THERMAL SENSOR
external Flash ROM
ASSY
TE1
D18
4
Y DRIVE ASSY
3
D6 Y2
CN2002
IC1204
EEPROM
2
D1
P2
IC8351
Thermal
Sensor 1
Moisture
Sensor