Sharp MX-M260 Service Manual page 84

Trouble
code
Main Sub
code code
H4 01 Content Sub heater lamp abnormally low
temperature detection
Details The setup temperature (about 90°C) is not
reached within the specified time (about
17sec) from turning on the power.
When the temperature of sub heater
thermistor falls below 140°C in the standby
mode or printing.
When the temperature of sub heater lamp
thermistor falls below 50°C in the pre-heat
mode.
Cause Sub heater lamp thermistor defect.
Sub heater lamp failure.
Sub thermostat failure.
Control PWB failure.
Check Check the sub heater lamp blinking with
and SIM 5-2-2.
remedy
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.
20 Content Main 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 main thermistor is not
reached within the specified temperature.
(specified temperature : SIM43-1 (600dpi)
–25°C )
Cause Main thermistor defect.
Main heater lamp failure.
Main thermostat failure.
Control PWB failure.
Check Check the main heater lamp blinking with
and SIM 5-1.
remedy
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.
Details of trouble
MX-M260/M310/M260N/M310N SELF DIAG AND TROUBLE CODE 7 - 8
Trouble
code
Main Sub
code code
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 Check the sub heater lamp blinking with
and SIM 5-2-2.
remedy
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 Check for jam paper in the fusing section.
and (paper winding, etc.)
remedy
Check fusing unit installation.
Check the POD1, POD2 or PPD2 sensor.
Clear the trouble with SIM 14.
Details of trouble