AR-M316 (serv.man10). ARM256 316 Service Manual - Sharp Copying Equipment Service Manual (repair manual). Page 109

AR-M256/M257/M258/M316/M317/M318/5625/5631  TROUBLE CODE LIST 9 - 10

H4

21

Content

Sub heater lamp abnormally low 
temperature detection

Details

The setup temperature (about –25°C: Sim 
43-1-1) is not reached within the specified 
time (about 32sec) from turning on the 
power. 

A/D value of fusing sub thermistor is not 
reached within the specified temperature 
(specified temperature : SIM43-1 (600dpi)
–25°C )

Cause

Sub thermistor defect.

Sub heater lamp failure.
Sub thermostat failure.

Control PWB failure.

Check 
and 
remedy

Check the sub heater lamp blinking with 
SIM 5-2-2.
When the lamp blinks normally:
Check the thermistor and the harness.

Check the MCU PWB thermistor input 
circuit.

If lamp lights and stays lit:
Check the power circuit and the lamp 
control circuit on MCU PWB.
Clear the display of self-diagnostics with 
SIM 14.

Check that there is no foreign material in 
the contact section between the thermistor 
and the heat roller. 

H5

01

Content

10 times of continuous detection of the 
lower paper exit sensor (POD1) lead edge 
jam or the upper paper exit sensor (POD2) 
lead edge jam or the duplex sensor 
(PPD2) rear edge jam

Details

After supplying the power, one of the 
above jams occurs 10 times continuously 
in printing

Counting is started on supplying the 
power. When any one of the above jams 
occurs, one count is made. When paper 
entry to the POD1 or POD2 is detected, 
the counter is cleared.

Cause

A paper jam (paper rounding, etc.) near 
the duplex sensor (PPD2) on the fusing 
unit is not canceled completely.
POD1, POD2, PPD2 sensor breakdown or 
harness connection trouble

Fusing unit installation failure

Check 
and 
remedy

Check for jam paper in the fusing section. 
(paper winding, etc.)
Check fusing unit installation.

Check the POD1, POD2 or PPD2 sensor.

Clear the trouble with SIM 14.

Trouble 

code

Details of trouble

Main 
code

Sub 

code

L1

00

Content

Scanner feed trouble

Details

Scanner feed is not completed within the 
specified time.

Cause

Mirror unit defect.

Scanner wire disconnection.
Origin detection sensor error.

Mirror motor harness abnormality.

Check 
and 
remedy

Check the scanning operation with SIM 1-
1.
When the mirror not feeds:
Check for disconnection of the scanner 
wire.
Check the harness and connector between 
the mirror motor and the MCU PWB.

Replace the mirror unit.

Replace the MCU PWB.
When the mirror feeds:
Check the mirror home position sensor 
with SiM 1-2.

L3

00

Content

Scanner return trouble

Details

Scanner return is not completed within the 
specified time.
When OC copying with the mirror at the 
home position, the mirror is not in the 
home position.

Cause

Mirror unit defect.

The scanner wire is disconnected.
Origin detection sensor error.

Mirror motor harness abnormality.

Check 
and 
remedy

Check the scanning operation with SIM 1-
1.
When the mirror fails to return:
Check for disconnection of the scanner 
wire.

Check the harness and connector between 
the mirror motor and the MCU PWB.

Replace the mirror unit.
Replace the MCU PWB.

When the mirror feeds:
Check the mirror home position sensor 
with SiM 1-2.

L4

01

Content

Main motor trouble

Details

The main motor does not rotate.

The motor lock signal is detected for 1sec 
or more after the main motor rotates.

The motor lock signal is detected for 1sec 
during rotation of the main motor.

Cause

Main motor defect.

Main motor connection, harness trouble or 
disconnection.

MCU PWB failure.

Check 
and 
remedy

Check the main motor operation with SIM 
25-1.

Check connection of the main motor 
harness and connector.

Replace the main motor.
Replace the MCU PWB.

Trouble 

code

Details of trouble

Main 
code

Sub 

code