AR-C260 (serv.man14). (11) Troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 15

AR-C260/C260M  TROUBLESHOOTING  11 - 15

Main 
code

Sub 

code

Title

Display

Lamp/Message

Phenomenon

Detail

CRUM read/write error

Section

Developing

Case 1

Cause

Improper connection or 
disconnection of the 
connector and the harness 
between the PCU and the 
CRUM. 

Check & 
Remedy

Check the connector and 
the harness between the 
PCU and the CRUM.

Case 2

Cause

Developing unit trouble

Check & 
Remedy

Replace the developing 
unit. 

Case 3

Cause

Control PWB (PCU) 
trouble

Check & 
Remedy

Replace the PCU PWB. 

Main 
code

Sub 

code

Title

Display

Lamp/Message

Phenomenon

Detail

Before starting 
registration, the transfer 
belt surface is scanned 
with the image density 
sensor to adjust the sensor 
gain so that the output 
becomes a fixed value. 
However, when the sensor 
gain is changed, the value 
is not within the specified 
range. 

Section

—

Case 1

Cause

Image density sensor 
trouble, disconnection of 
the harness between the 
PCU PWB and the image 
density sensor, dirt on the 
image density sensor. 

Check & 
Remedy

Check the sensor and the 
harness. 

Case 2

Cause

Calibration plate solenoid 
operation trouble

Check & 
Remedy

Check the calibration plate 
solenoid operation.

Case 3

Cause

Insufficient cleaning of the 
transfer belt.

Check & 
Remedy

Check the transfer belt 
surface. 

Main 
code

Sub 

code

Title

Display

Lamp/Message

Phenomenon

Detail

First step operation error 
during half-tone process 
control

Section

—

Common

Check

Use SIM 44-2 to adjust the 
process control sensor 
gain. 

Case 1

Cause

When "Error" occurs in the 
gain adjustment of SIM 44-
2:
1. Disconnection of the 

harness between the 
PCU PWB and the 
image density sensor.

2. Image density sensor 

dirt/trouble

Check & 
Remedy

1. Check connection of 

the harness between 
the PCU PWB and the 
image density sensor.

2. Clean/replace the 

image density sensor. 

Case 2

Cause

When SIM 44-2 gain 
adjustment is completed:
Insufficient cleaning of the 
transfer belt, calibration 
plate solenoid operation 
trouble

Check & 
Remedy

Check the drum surface 
and the belt surface. 

Main 
code

Sub 

code

Title

Display

Lamp/Message

Phenomenon

Detail

First step operation error 
during half-tone process 
control

Section

—

Common

Check

Use SIM 44-2 to adjust the 
process control sensor 
gain. 

Case 1

Cause

When "Error" occurs in the 
gain adjustment of SIM 44-
2:
1. Disconnection of the 

harness between the 
PCU PWB and the 
image density sensor.

2. Image density sensor 

dirt/trouble

Check & 
Remedy

1. Check connection of 

the harness between 
the PCU PWB and the 
image density sensor.

2. Clean/replace the 

image density sensor. 

Case 2

Cause

When SIM 44-2 gain 
adjustment is completed:
Insufficient cleaning of the 
transfer belt, calibration 
plate solenoid operation 
trouble

Check & 
Remedy

Check the drum surface 
and the belt surface.