AR-C170 (serv.man28). Troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 23

AR-C170M  TROUBLESHOOTING  11 - 23

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Phenomenon Detail

1. Before driving the drum, 

the calibration plate is 
opened with the process 
control BK sensor, and 
light is emitted with the 
gain value of 0 and with 
the light emitting quantity 
fixed to 120. The 
average of ten light 
quantities repeats to be 5 
or less for 3 times 
continuously.

2. Immediately after driving 

the drum, the calibration 
plate is opened with the 
process control BK 
sensor, and one whole 
turn of the belt surface is 
scanned with the gain 
value of 0 and with the 
light emitting quantity at 
the optimum value (120 
– 50). The difference 
between the max. value 
and the min. value of the 
scanned data is 5 or 
less.

Section

Paper feed

Case 1

Cause

Transfer belt motor 
connector disconnection, 
defective connection of the 
harness between the PCU 
PWB and the transfer belt 
motor

Check & 
Remedy

Check the transfer belt 
motor operation with 
SIM25-1. Check the 
harness and the connector 
between the PCU PWB and 
the transfer belt motor.

Case 2

Cause

Process control sensor 
connector disconnection, 
process control BK sensor 
defect

Check & 
Remedy

Check the process control 
sensor operation with 
SIM44-2. Check the 
harness and the connector 
between the PCU PWB and 
the transfer belt motor.

Case 3

Cause

Defective control circuit

Check & 
Remedy

Check the control circuit.

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Phenomenon Detail

When initializing the shift 
motor, the change in the 
shift motor home position 
sensor characteristics is not 
detected within the 
specified time.

Section

Paper feed

Case 1

Cause

Shift motor trouble, 
disconnection of the 
harness between the PCU 
PWB and the shift motor, 
control circuit trouble

Check & 
Remedy

Use SIM 6-1 to check the 
shift motor operation. Use 
SIM 30-1 to check the shift 
motor home position 
sensor. Check the harness 
and the connector between 
the PCU PWB and the shift 
motor.

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Phenomenon Detail

The full wave signal is not 
provided.

Section

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Case 1

Cause

PCU PWB trouble

Check & 
Remedy

Replace the PCU PWB.

Case 2

Cause

Power supply unit trouble

Check & 
Remedy

Replace the power supply 
unit.

Case 3

Cause

Harness trouble

Check & 
Remedy

Check connection of the 
harness and the connector.

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An abnormality of the full 
wave signal frequency is 
detected. (The detected 
frequency is 65kHz or 
above, or 45kHz or below.)

Section

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Case 1

Cause

PCU PWB trouble

Check & 
Remedy

Replace the PCU PWB.

Case 2

Cause

Power supply unit trouble

Check & 
Remedy

Replace the power supply 
unit.

Case 3

Cause

Harness trouble

Check & 
Remedy

Check connection of the 
harness and the connector.