AR-C170 (serv.man28). Troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 14

AR-C170M  TROUBLESHOOTING  11 - 14

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

1st step of execution of half-
tone process control.
The low-density rising point 
or the high-density rising 
point cannot be calculated 
from the linear 
approximation formula of 
the ratio of the sensor 
output for the print 
gradation value obtained 
from the patch print result.
<The trouble is saved in the 
trouble history, but F2 
trouble is not displayed. The 
operation is made with the 
previous correction value.>

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

1st step of execution of half-
tone process control.
The low-density rising point 
or the high-density rising 
point cannot be calculated 
from the linear 
approximation formula of 
the ratio of the sensor 
output for the print 
gradation value obtained 
from the patch print result.
<The trouble is saved in the 
trouble history, but F2 
trouble is not displayed. The 
operation is made with the 
previous correction value.>

Section

—

Common

Check

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