AR-M700 (serv.man28). Self diag message and troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 24

: Feb. 9 2004

AR-M550/M620/M700  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 24

Case 2

Trouble 
position/
Cause

Improper connection of 
the harness between the 
PCU PWB and the drum 
marking sensor

Remedy

If “Error” is displayed, it 
may be considered as a 
breakdown. Check the 
sensor and the harness.

Note 

Case 3

Trouble 
position/
Cause

The drum marking sensor 
is dirty.
OPC drum cleaning 
trouble

Remedy

If the adjustment is 
completed, check the 
drum surface conditions.

Note 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp
Message

Details

Process thermistor 
breakdown
When the process 
thermistor detection, 
3.03V or above, or 0.28V 
or below is detected 
once.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Improper connection of 
the process thermistor 
harness.

Remedy

Check connection of the 
connector and the 
harness of the process 
thermistor.

Note 

Case 2

Trouble 
position/
Cause

Process thermistor 
trouble

Remedy

Replace the process 
thermistor.

Note 

Case 3

Trouble 
position/
Cause

PCU PWB trouble

Remedy

Check the PCU PWB.

Note 

Main 
code

Sub 

code

Title

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp
Message

Details

Developing thermistor 
open or short.
Three successive values 
of 244 or above, or values 
of 20 or below, are 
detected at the 
developing thermistor.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Developing thermistor 
harness connection 
trouble

Remedy

Check connection of the 
connector and the 
harness of the developing 
thermistor.

Note 

Case 2

Trouble 
position/
Cause

Developing thermistor 
trouble

Remedy

Check the developing 
thermistor

Note 

Case 3

Trouble 
position/
Cause

PCU PWB trouble

Remedy

Check the PCU PWB.

Note 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp
Message

Details

Developing humidity 
sensor open or short.
A value of greater than or 
equal to 255 or above, or  
value of 7 or below, is 
detected at the developing 
humidity sensor.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Developing humidity 
sensor harness 
connection trouble

Remedy

Check connection of the 
connector and the 
harness of the developing 
humidity sensor.

Note 

Case 2

Trouble 
position/
Cause

Developing humidity 
sensor trouble

Remedy

Check the developing 
humidity sensor

Note 

Case 3

Trouble 
position/
Cause

PCU PWB trouble

Remedy

Check the PCU PWB.

Note