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

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AR-C260/C260M  TROUBLESHOOTING  11 - 15
Main 
code
Sub 
code
Title
Developing unit CRUM trouble 
(Yellow)
F2
77
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
Trouble of image density sensor 
for registration (Transfer belt 
surface reflection ratio 
abnormality)
F2
78
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
Half-tone process control 1st batch 
trouble (Black)
F2
80
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
Half-tone process control 1st batch 
trouble (Cyan)
F2
81
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. 
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