Question about Sharp AR-M237 Digital Copier

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Sharp AR-M237 Error Code H4-21

I replaced the fuser but it keeps coming up with error Code H4-21.

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  • Anonymous Mar 28, 2014

    error H4

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-H4-21 means:Sub heater lamp abnormally low temperature detection. The setup temperature (about –25°C: Sim 43-1-1) is not reached within the specified time (about 32sec) from turning on the power ON SW. (When the temperature falls below 140°C in the standby mode.)
-Causes:
Sub heater thermistor defect
Sub heater lamp failure
Sub thermostat failure
Control PWB failure
-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.
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.
The H4 errors will not reset by themselves. You must enter service mode to reset this error even if the problem has been repaired. The reset process is outlined below (DO NOT USE ANY OTHER FUNCTIONS IN SERVICE MODE):
Press the following sequence: "#/P" "*" "C" "*"
Type in 1 4
Press start
hit 1 for yes
hit start
Unit should power off and the restart.
If the error code recurrs ther are other problems.

Posted on Jun 06, 2008

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Thankz guys you all save me some money

Posted on Oct 17, 2012

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hamzaskilltd
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SOURCE: SHARP AR-M237 H2-00 ERROR CODE---HAVE INSTALLED

H2.00. Thermistor open

Posted on Mar 21, 2011

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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) The fuser gets very Hot!! Let cool for 10 minutes after turning off the power and unplugging the copier!

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CBR Tech Solutions or http://www.cbrtechsolutions.com

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202.01 and 202.03 Paper Jam


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1 Answer

RESEAT FUSER


Hi G,

99% of the time the error is the fuser. Either it is damaged, or just not locked in place, and with power off, reseating it will fix the error. Since you just replaced the fuser, I guess the question is did you do it because it was also giving this error, or because it reached EOL ( end of life ).

If it was for EOL message, I would try reinstalling it. If the "reseat fuser" error goes away, but comes back with the new fuser again, then the new fuser you purchased is defective and should be returned or exchanged.

See the information below to correctly troubleshoot your issue.

The following steps are the troubleshooting steps that should be followed for error code 010 397.
First, the definition of the failure is <IOT Fuser Failure>, and means a Fuser Error is detected.

1) With power off, reseat the fuser by physically removing it from the printer, then reinstalling it and locking it in place. Turn the power back on. ( if the error is still present, proceed to step 2 ).

2) If reseating the fuser did not resolve the problem, Replace the fuser with a known good fuser.
( if problem is not resolved, proceed to step 3)

3) Replace the LVPS ( low voltage power supply ). ( if problem not resolved, proceed to step 4 ).

4) Replace the PWBA MCU ( printed wiring board assembly - machine control unit ).

END of troubleshooting.........

In most cases, the fuser itself is the problem. If you tried to reseat or replace the fuser while power was still on, the LVPS could have been damaged just as if there were an electrical storm.

Hopefully this helped.

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Try very quickly # * C * then 14 and 1 for yes to reset, chances are it will come back, do not keep re entering code, it will need the fuser repaired.. job 4 a teco.

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