Sharp AR5316 Error Codes H4-00

This error occurs when the heating temperature in the fuser unit is not reached during warm up or operation time:

• When the fusing temperature is lower than 150C° after 55sec from the start of warming up.
• When the warming up complete temperature is not reached in 30sec from reaching 150C°.
• When the fusing temperature is lower than 100C° after 20sec from ready start.
• When the fusing temperature is lower than 145C° when printing.”

Causes

• Heater lamp disconnection or burnt out.

• Thermistor defective or dirty.

• Low power voltage in the mains supply.
• Thermal fuse out or thermostat cutout.

How To Fix Error Code H4-00 ?

1^st Method : “Reset Code”

You simply reset the error code by :

• OFF and then ON the copier again
• PRESSE #, interupt, C, interupt, then input 14 then start.
• Unit should power off and the restart.

2^nd Method: 

1. Use SIM 5-02 to check the heater lamp blinking operation.
2. When the lamp blinks normally.
3. Check the thermistor and its harness.
4. Check the thermistor input circuit on the control PWB. When the lamp does not light up.
5. Check for disconnection of the heater lamp and the thermostat.
6. Check the interlock switch.
7. Check the power PWB and the lamp control circuit on the MCU PWB. Use SIM 14 to clear the self diagnostic display.
8. Measure power using voltmeter and wait till it stabilizes.