means the copier is not seeing the fusing unit. 1.
Check the fuser unit to see if it is set properly.
There are some connections on the fuser unit
not making good contact.Reset
the fuser and power the machine off and on
Next, you have to reset the SC548
code from the copier memory.
Press Clear Mode
and hold the Clear/Stop
(Red button) until you can see Copy SP
page displayed. Press Copy SP
, then while on that page turn the machine off and back on