AR-C170 (serv.man28). Troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 17

AR-C170M  TROUBLESHOOTING  11 - 17

Main 
code

Sub 

code

Title

Display

Lamp/Message

Phenomenon Detail

2nd step of execution of 
half-tone process control.
When connecting the 
approximation formula (the 
relationship of sensor 
output ratios for the print 
gradation values) in the low-
density section and that in 
the high-density section 
obtained from the patch 
print result, DUTY1 for 20% 
of output ratio in the low-
density section is greater 
than DUTY2 for 25% of 
output ratio in the high-
density section.
<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

2nd step of execution of 
half-tone process control.
When connecting the 
approximation formula (the 
relationship of sensor 
output ratios for the print 
gradation values) in the low-
density section and that in 
the high-density section 
obtained from the patch 
print result, DUTY1 for 20% 
of output ratio in the low-
density section is greater 
than DUTY2 for 25% of 
output ratio in the high-
density section.
<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.