AR-M550 (serv.man16). (9) Self diag message and troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 23

AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 23

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp
Message

Details

Communication with the 
IC chip cannot be made.
Data write failure to the 
CRUM or data read 
failure from the CRUM 
occurs 3 times 
continuously except for 
toner cartridge installation 
detection.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

IC chip trouble
Improper cartridge

Remedy

Insert a proper cartridge.

Note 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp

Message

Details

Process control trouble 
(Photoconductor surface 
reflection rate 
abnormality)
Before starting process 
control, the drum surface 
is read by the image 
density sensor to make 
the sensor gain 
adjustment so that the 
output is fixed to a certain 
level. Though the sensor 
gain is changed, the 
output is not fixed to a 
certain level.

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Image density sensor 
trouble

Remedy

Use SIM 44-02 to perform 
the process control 
sensor gain adjustment.

Note 

Case 2

Trouble 
position/
Cause

Improper connection of 
the harness between the 
PCU PWB and the image 
density 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 image density sensor 
is dirty.
OPC drum cleaning 
trouble

Remedy

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

Note