Sharp AR-M 237 Error Code H4-00

[vonhetcchtel]

Goodday,
Please help me with this Sharp AR-M 237 Photocopier which is
displaying Error code H4-00.
Thanks in Advance

[RascalMJ]

Goodday,
Please help me with this Sharp AR-M 237 Photocopier which is
displaying Error code H4-00.
Thanks in Advance

From the manual:

H4 00 Content Main 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 ON SW.
(When the temperature of main heater
lamp thermistor falls below 140°C in the
standby mode or printing.)
Whether temperature of main heater lamp
thermistor falls below 50°C in the pre-heat
mode.
Cause Main heater lamp thermistor defect
Main heater lamp failure
Main thermostat failure
Control PWB failure
Check
and
remedy
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.

[OMD-227]

Check the main heat lamp. The lamp holder plate was modified a few years back to give extra heat expansion allowance between the lamp & the plate. It was common for the lamp ends to crack due to no heat expansion allowance in the fuser frame.

[vonhetcchtel]

How can I log onto the diagnostic mode on this copier? in order to run Sim 14
and the other codes?
Thanks once more.

[Hemlock]

From the manual -

Entering the simulation mode
1) #/P key (program) ON → Asterisk (*) key ON → CLEAR key ON →
Asterisk (*) key ON → Ready for input of a main code of simulation