Question about Sharp AR-M237 Digital Copier

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CALL FOR SERVICE CODE H4-20 - Sharp AR-M237 Digital Copier

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That code is a fuser main heater lamp abnormally low temp...that can be caused by several things. First thing to try is reset the machine using the sim 14 code. that is...#, *, C, * the 14 then start then 1 then start the machine will restart and reset if it was a one time code(which it could be) then the unit will work. If the code comes back check the thermistors in the fuser they sometimes get a build up of toner on them and give false errors

Posted on Feb 28, 2014

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Possible causes for this are:
Thermistor defect
Heater lamp failure
Thermostat failure
Control PWB failure

Try the following remedies:
Check the heater lamp blinking with SIM 5- 2. When the lamp blinks normally:
Check the thermistor and the harness. Check the MCU PWB thermistor input circuit.
When the lamp does not light:
Check for disconnection of the heater lamp and thermostat.
Check the interlock switch.
Check the power PWB and the MCU PWB lamp control circuit.
Clear the display of self-diagnostics with SIM 14.
To enter self-diagnostics mode press the following # * C *

Posted on Feb 09, 2014

  • Gareth Pegg
    Gareth Pegg Feb 09, 2014

    Possible causes for this are:

    Thermistor defect

    Heater lamp failure

    Thermostat failure

    Control PWB failure



    Try the following remedies:

    Check the heater lamp blinking with SIM 5- 2.



    When the lamp blinks normally:

    Check the thermistor and the harness. Check the MCU PWB thermistor input circuit.

    When the lamp does not light:

    Check for disconnection of the heater lamp and thermostat.

    Check the interlock switch.

    Check the power PWB and the MCU PWB lamp control circuit.

    Clear the display of self-diagnostics with SIM 14.


    To enter self-diagnostics mode press the following # * C *








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