Office Equipment & Supplies - Page 4 - Recent Questions, Troubleshooting & Support
I have a Sharp printer Model AL-2040CS (purchased in 2010). This error message flashing "H 4" on my screen.
H4 00 Content Main heater lamp abnormally low
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
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 52.
When the lamp blinks normally:
Check the thermistor and the harness.
Check the MCU PWB thermistor input
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
24 hours ago
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