Process Control Trouble; Drum Marking Sensor Gain Adjustment Error; Process Thermistor Breakdown; Developing Thermistor Breakdown - Sharp MX-M550U Service Manual

F2-32

Process control trouble

(Drum marking scan trouble)
Details The drum marking size, density, or the number of
units is improper.
Section Engine
Case 1 Cause Drum marking sensor trouble
Check and Use SIM 44-02 to perform the process control
remedy sensor gain adjustment.
Case 2 Cause Improper connection of the harness between the
PCU PWB and the drum marking sensor
Check and If "Error" is displayed, it may be considered as a
remedy breakdown. Check the sensor and the harness.
Case 3 Cause The drum marking sensor is dirty.
OPC drum cleaning trouble
Check and If the adjustment is completed, check the drum
remedy surface conditions.
F2-37 Drum marking sensor gain adjustment
error
Details Before starting process control, the drum marking
area surface is read by the sensor to make the
sensor gain adjustment so that the output is fixed
to a certain level. Though the sensor gain is
changed, the output is not fixed to a certain level.
Section Engine
Case 1 Cause Drum marking sensor trouble
Check and Use SIM 44-02 to perform the process control
remedy sensor gain adjustment.
Case 2 Cause Improper connection of the harness between the
PCU PWB and the drum marking sensor
Check and If "Error" is displayed, it may be considered as a
remedy breakdown.
Check the sensor and the harness.
Case 3 Cause The drum marking sensor is dirty.
OPC drum cleaning trouble
Check and If the adjustment is completed, check the drum
remedy surface conditions.
F2-39

Process thermistor breakdown

Details When the input value of the process thermistor is
detected as 235 or greater or 22 or smaller for 3
times continuously.
Section Engine
Case 1 Cause Improper connection of the process thermistor
harness.
Check and Check connection of the connector and the
remedy harness of the process thermistor.
Case 2 Cause Process thermistor trouble
Check and Check the process thermistor.
remedy
Case 3 Cause PCU PWB trouble
Check and Check the PCU PWB.
remedy
MX-M700N SELF DIAG AND TROUBLE CODE 8 – 14
F2-46

Developing thermistor breakdown

Details When the input value of the process thermistor is
detected as 244 or greater or 20 or smaller for 3
times continuously
Section Engine
Case 1 Cause Developing thermistor harness connection trouble
Check and Check connection of the connector and the
remedy harness of the developing thermistor.
Case 2 Cause Developing thermistor harness trouble
Check and Check the developing thermistor
remedy
Case 3 Cause PCU PWB trouble
Check and Check the PCU PWB.
remedy
F2-47 Room temperature thermistor
breakdown
Details When the input value of the process thermistor is
detected as 235 or greater or 22 or smaller for 3
times continuously.
Section Engine
Case 1 Cause Improper connection of the room temperature
thermistor harness.
Check and Check connection of the connector and the
remedy harness of the process thermistor.
Case 2 Cause Room temperature thermistor trouble
Check and Check the room temperature thermistor.
remedy
Case 3 Cause PCU PWB trouble
Check and Check the PCU PWB.
remedy
F2-48 Developing humidity sensor break
down
Details When the output value of the development
humidity sensor is detected as 38 or smaller or
255 or greater.
The output value is the average value of 5
sampling data in the interval of 100ms.
Section Engine
Case 1 Cause Developing humidity sensor harness connection
trouble
Check and Check connection of the connector and the
remedy harness of the developing humidity sensor.
Case 2 Cause Developing humidity sensor trouble
Check and Check the developing humidity sensor
remedy
Case 3 Cause PCU PWB trouble
Check and Check the PCU PWB.
remedy