Developing Unit Crum Trouble (Yellow); Trouble Of Image Density Sensor For Registration (Transfer Belt Surface Reflection Ratio Abnormality); Half-Tone Process Control 1St Patch Error (Black); Half-Tone Process Control 1St Patch Error (Cyan) - Sharp AR-BC260 Service Manual

Main Sub Developing unit CRUM trouble
Title
code code (Yellow)
F2 77 Display Lamp/Message
Phenomenon Detail
Section Developing
Case 1 Cause
Check &
Remedy
Case 2 Cause
Check &
Remedy
Case 3 Cause
Check &
Remedy
Trouble of image density sensor
Main Sub for registration (Transfer belt
Title
code code surface reflection ratio
abnormality)
F2 78 Display Lamp/Message
Phenomenon Detail
Section
Case 1 Cause
Check &
Remedy
Case 2 Cause
Check &
Remedy
Case 3 Cause
Check &
Remedy
CRUM read/write error
Improper connection or
disconnection of the
connector and the harness
between the PCU and the
CRUM.
Check the connector and
the harness between the
PCU and the CRUM.
Developing unit trouble
Replace the developing
unit.
Control PWB (PCU) trouble
Replace the PCU PWB.
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.
—
Image density sensor
trouble, disconnection of
the harness between the
PCU PWB and the image
density sensor, dirt on the
image density sensor.
Check the sensor and the
harness.
Calibration plate solenoid
operation trouble
Check the calibration plate
solenoid operation.
Insufficient cleaning of the
transfer belt.
Check the transfer belt
surface.
AR-BC260 TROUBLESHOOTING 11 - 14
Main Sub Half-tone process control 1st patch
Title
code code error (Black)
F2 80 Display Lamp/Message
Phenomenon Detail
Section
Common Check
Case 1 Cause
Check &
Remedy
Case 2 Cause
Check &
Remedy
Main Sub Half-tone process control 1st patch
Title
code code error (Cyan)
F2 81 Display Lamp/Message
Phenomenon Detail
Section
Common Check
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.>
—
Use SIM 44-2 to adjust the
process control sensor
gain.
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
1. Check connection of the
harness between the
PCU PWB and the
image density sensor.
2. Clean/replace the image
density sensor.
When SIM 44-2 gain
adjustment is completed:
Insufficient cleaning of the
transfer belt, calibration
plate solenoid operation
trouble
Check the drum surface
and the belt surface.
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.>
—
Use SIM 44-2 to adjust the
process control sensor
gain.