Sharp AR5631

Error Code:

Code: H4-00
Description: Main heater lamp abnormally low temperature detection
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.
Causes: Main heater lamp thermistor defect Main heater lamp failure Main thermostat failure Control PWB failure
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. If lamp lights and stays lit: Check for disconnection of the heater lamp and thermostat. Check the interlock switch. Check the power circuit and the lamp control circuit on MCU PWB. Clear the display of self-diagnostics with SIM 14.

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