Reset fuser code 6400 by pressing counter/system button, then go to service setting, then hold the start and hash button at the same time, now press enter and leave all buttons, press 163 and enter/execute, switch off and on, fuser will be reset, if not reset then replace fuser/fixing unit
C6400 Zero-crossing signal problem
• The engine PWB does not detect the
zero-crossing signal for the time
specified below.
At power-on: 3 s
Others: 5 s
Causes: Poor contact in the connector terminals.
Remarks: Check the connection of connectors YC7
on the engine PWB and YC2 on the power
supply PWB, and the continuity across the
connector terminals. Repair or replace if
necessary.
Causes: Defective power supply PWB.
Remarks: Check if the zero-crossing signal is output
from YC2-11 on the power supply PWB. If
not, replace the power supply PWB.
Causes: Defective engine PWB.
Remarks: Replace the engine PWB if C6400 is detected
while YC2-11 on the power supply
PWB outputs the zero-crossing signal.
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