2-51
Confidential
■ Error code 0900
Detected irregular power supply for more than 100 times.
■ Error code 0A02
Detected a fan failure.
Step Cause Remedy
1
Low-voltage power supply PCB 
failure
Replace the low-voltage power supply 
PCB. Refer to “1.3.28 Reset counters for 
consumable parts (Function code 88)” in 
Chapter 5 to reset the irregular power 
supply detection counter after the 
replacement.
2 Main PCB failure Replace the main PCB.
Note:
The irregular power supply detection error (Error code 0900) of the low-voltage power 
supply PCB occurs when there is a large distortion in the power supply voltage supplied to 
the machine. In this case, if the same power supply is used, the same error might occur 
again even if the low-voltage power supply PCB is replaced. For this reason, be sure to ask 
the user to rearrange the installation environment.
Step Cause Remedy
1
Connection failure of the fan 
harness
Reconnect the fan harness.
2
Connection failure of the high-
voltage power supply flat cable
Reconnect the high-voltage power supply 
flat cable.
3 Fan failure Replace the fan.
4
High-voltage power supply PCB 
failure
Replace the high-voltage power supply 
PCB.
5 Main PCB failure Replace the main PCB.