AR-M700 (serv.man28). Self diag message and troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 32

: Feb. 9 2004

AR-M550/M620/M700  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 32

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp
Message

Details

Controller fan motor lock 
detection
The motor lock signal is 
detected during rotation of 
the controller fan motor.
The motor lock signal is 
detected during rotation of 
the HDD fan motor.

Section

Controller

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Fan motor trouble

Remedy

Use SIM 6-2 to check the 
fan motor operation.

Note 

Case 2

Trouble 
position/
Cause

Improper connection of 
the harness between the 
controller PWB and the 
fan motor.
Control circuit trouble

Remedy

Check the harness and 
the connector between 
the controller PWB and 
the fan motor.

Note 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp
Message

Details

Paper exit thermistor 
open or short.
When the temperature of 
100°C or above (entered 
value 235) is detected in 
the paper exit thermistor 
3 times or more 
continuously.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Defective contact of 
paper exit thermistor 
harness

Remedy

Check connection of the 
paper exit thermistor 
harness and the connector.

Note 

Case 2

Trouble 
position/
Cause

Fan motor trouble

Remedy

Use SIM 6-2 to check the 
fan motor operation.

Note 

Case 3

Trouble 
position/
Cause

PCU PWB, harness 
connection between fan 
and motor trouble
PCU circuit trouble
Thermistor (TH_EX) 
trouble

Remedy

Check the PCU PWB, the 
harness between fan and 
motor, and the connector.

Note 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp
Message

Details

Polygon motor lock 
detection
It is judged that the 
polygon motor lock signal 
of the LSU is not 
outputted.
The polygon motor lock 
signal is checked in an 
interval of 10sec after 
starting the polygon 
motor, and it is found that 
the polygon motor is not 
rotating normally.

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Polygon motor trouble

Remedy

Use SIM 61-1 to check 
the polygon motor 
operation.

Note 

Case 2

Trouble 
position/
Cause

Disconnection or 
breakage of the LSU 
connector or the harness 
in the LSU

Remedy

Check connection of the 
harness and the 
connector.
Replace the LSU.

Note 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp
Message

Details

The full wave signal is not 
detected.

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Disconnection or 
breakage of the PCU 
PWB connector or the 
harness in the power unit

Remedy

Check connection of the 
harness and the 
connector.

Note 

Case 2

Trouble 
position/
Cause

PCU PWB trouble

Remedy

Replace the PCU PWB.

Note 

Case 3

Trouble 
position/
Cause

12V power source trouble

Remedy

Replace the power unit.
Replace the controller 
connection mother board.

Note