Here is some info from servicemanual you enter SP Mode by holding down "up" and "down" arrow for 10 s then you press "enter"
Good luck
SC 541 Heating roller
thermistor error
The temperature measured by
the heating roller thermistor
does not reach 7 °C for ten
seconds.
•
Loose connection of
the heating roller
thermistor
•
Defective heating roller
thermistor
•
Defective BCU
1. Check if the heating roller thermistor
is firmly connected.
2. Replace the fusing unit.
3. Replace the BCU.
Controller
errors CTL The error has occurred in the
controller.
See .Troubleshooting Procedure. in
the table.
A
The error involves the fusing unit.
The machine operation is disabled.
The user cannot reset the error.
Turn the main switch off and on.
Reset the SC (set SP5-810-1). Turn
the main switch off and on.
B
The error involves one or some
specific units. The machine
operates as usual, excluding the
related units.
Turn the operation switch off and
on.
C
The error is logged. The SC-code
history is updated. The machine
operates as usual.
The SC will not show. Only the SC
history is updated.
Other
errors
D
The machine operation is disabled.
You can reset the machine by
turning the operation switch or main
switch off and on. If the error occurs
again, the same SC code is
displayed.
Turn the operation switch or main
power switch off and on.
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