Thermistor Open/Fusing Unit Not Installed (Hl3); Fusing Section High Temperature Trouble (Hl1); Fusing Section High Temperature Trouble (Hl2); Fusing Section High Temperature Trouble (Hl3) - Sharp MX-M550U Service Manual

H2-02 Thermistor open/Fusing unit not
installed (HL3)
Details Thermistor open
(An input voltage of 4.6V or above is detected.)
Fusing unit not installed
Section Engine
Case 1 Cause Thermistor trouble.
Control PWB trouble.
Improper connection of the fusing section
connector.
AC power trouble.
Fusing unit not installed.
Check and Check the harness and the connector between the
remedy thermistor and the control PWB.
Use SIM 14 to clear the self diag display.
H3-00 Fusing section high temperature
trouble (HL1)
Details The fusing temperature exceeds 241.5 °C.
(An input voltage of 1.3V or less is detected.)
When fusing temperature control is started and a
temperature of 242 °C is detected 3 times
continuously in sampling of 250 msec interval.
(In the interval of 150ms)
Section Engine
Case 1 Cause Thermistor trouble
Control PWB trouble
Improper connection of the fusing section
connector
AC power trouble
Check and Use SIM 5-2 to check flashing of the heater lamp.
remedy When the lamp flashes normally.
• Check the thermistor and the harness.
• Check the thermistor input circuit on the control
PWB.
When the lamp keeps ON.
• Check the AC PWB and the lamp control circuit
on the control PWB.
Use SIM 14 to cancel the trouble
H3-01 Fusing section high temperature
trouble (HL2)
Details The fusing temperature exceeds 241.5 °C.
(An input voltage of 1.3V or less is detected.)
When fusing temperature control is started and a
temperature of 242 °C is detected 3 times
continuously in sampling of 250 msec interval.
(In the interval of 150ms)
Section Engine
Case 1 Cause Thermistor trouble.
Control PWB trouble.
Improper connection of the fusing section
connector.
AC power trouble.
Check and Use SIM 5-2 to check flashing of the heater lamp.
remedy When the lamp flashes normally.
• Check the thermistor and the harness.
• Check the thermistor input circuit on the control
PWB.
When the lamp keeps ON.
• Check the AC PWB and the lamp control circuit
on the control PWB.
Use SIM 14 to cancel the trouble
MX-M700N SELF DIAG AND TROUBLE CODE 8 – 17
H3-02 Fusing section high temperature
trouble (HL3)
Details The fusing temperature exceeds 241.5 °C.
(An input voltage of 1.3V or less is detected.)
When fusing temperature control is started and a
temperature of 242 °C is detected 3 times
continuously in sampling of 250 msec interval.
(In the interval of 150ms)
Section Engine
Case 1 Cause Thermistor trouble
Control PWB trouble
Improper connection of the fusing section
connector
AC power trouble
Check and Use SIM 5-2 to check flashing of the heater lamp.
remedy When the lamp flashes normally.
• Check the thermistor and the harness.
• Check the thermistor input circuit on the control
PWB.
When the lamp keeps ON.
• Check the AC PWB and the lamp control circuit
on the control PWB.
Use SIM 14 to cancel the trouble
H4-00 Fusing section low temperature
trouble (HL1)
Details The set temperature is not reached within the
specified time (normally 3 min or 5 min in the curl
prevention mode) after turning on the power relay.
When the heater lamp is not turned off in 4 min
after starting the warm-up operation.
When the set value of -40°C is detected for 5 times
continuously in the specified interval after
completion of the warm-up operation.
(In the interval of 150ms)
Section Engine
Case 1 Cause Thermistor trouble
Heater lamp trouble
Control PWB trouble
Thermostat trouble
AC power trouble
Interlock switch
Check and Use SIM 5-2 to check flashing of the heater lamp.
remedy When the lamp flashes normally.
• Check the thermistor and the harness.
• Check the thermistor input circuit on the control
PWB.
When the lamp does not turn on.
• Check for
disconnection of the heater lamp or the
thermostat.
• Check the interlock switch.
• Check the AC PWB and the lamp control circuit
on the control PWB.
Use SIM 14 to cancel the trouble