AR-C170 (serv.man28). Troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 12

AR-C170M  TROUBLESHOOTING  11 - 12

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Phenomenon Detail

Toner empty sensor output 
abnormality

Section

Cartridge

Case 1

Cause

Connector harness trouble, 
connector disconnection

Check & 
Remedy

1. Check connection of the 

toner empty sensor. 

→

 

Connect it properly.

2. Check connection of the 

connector harness to the 
PCU PWB. 

→

 Connect it 

properly.

3. Check connection of the 

cartridge. 

→

 Connect it 

properly.

4. Check for disconnection 

of the harness. 

→

 

Replace the harness.

Case 2

Cause

Cartridge trouble

Check & 
Remedy

Replace the cartridge.

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Phenomenon Detail

Before starting process 
control, 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 output is not within the 
specified range.

Section

—

Common

Check

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

Case 1

Cause

When "Error" occurs in SIM 
44-2:
1. Dirt/defect of the image 

density sensor

2. Disconnection of the 

harness between the 
PCU PWB and the 
image density sensor

3. Calibration plate 

solenoid operation 
trouble

Check & 
Remedy

1. Clean/replace the image 

density sensor.

2. Connect/replace the 

harness between the 
PCU PWB and the 
image density sensor.

3. Replace the calibration 

plate solenoid.

Case 2

Cause

When SIM 44-2 is 
completed:
1. Insufficient cleaning of 

the transfer belt.

Check & 
Remedy

1. Check the transfer belt 

surface.

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Lamp/Message

Phenomenon Detail

Before starting process 
control, the calibration plate 
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 output is not within the 
specified range.

Section

—

Common

Check 

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

Case 1

Cause

When "Error" occurs in SIM 
44-2:
1. Dirt/defect of the image 

density sensor

2. Disconnection of the 

harness between the 
PCU PWB and the 
image density sensor

Check & 
Remedy

1. Clean/replace the image 

density sensor.

2. Connect/replace the 

harness between the 
PCU PWB and the 
image density sensor.

Case 2

Cause

When SIM 44-2 is 
completed:
1. Dirt on the calibration 

plate, calibration plate 
solenoid operation 
trouble

Check & 
Remedy

1. Clean the calibration 

plate. Replace the 
calibration plate 
solenoid.

Main 
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Sub 

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Display

Lamp/Message

Phenomenon Detail

Process humidity sensor 
open

Section

Process

Case 1

Cause

Process humidity sensor 
harness disconnection

Check & 
Remedy

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

Case 2

Cause

Process humidity sensor 
trouble

Check & 
Remedy

Replace the process 
humidity sensor.

Case 3

Cause

PCU PWB trouble

Check & 
Remedy

Replace the PCU PWB.