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SC 542 Fusing temperature warm up error.Fusing lamp defective,poor fusing unit connector,thermistor warped or broken,thermostat has tripped,power supply defective.After verify the componenets try reset the error.Enter in service mode:Press the yellow key and press 107 and keep pressed the stop key 3 second.Touch the SP window on screen open the front door and turn OFF the copier.Wait 1 minutes ,close the front door and turn ON the copier.If the error code persist change the upper fuser roller and the thermistors.
You can check the following. 1. hot roller thermistor is out of position or dirty. 2. Fuser lamp is broken. 3. Thermostat is open. (Like a thermal fuse, there SHOULD be continuity) 4. Clean and scrap clean the gold pins that connect into the copier. Sometimes they get corroded or bent slightly out of shape so they don't make contact with the terminals.
Hi Andreas: The fusing unit has not been reinstalled properly. There is a receptical on the back of the Fuser that mates with a plug in the machine when you install the part. the machine is telling you it did not detect the fuser. Undo the screws and remove it and reinset it again, makin sure that it seats properly. then you will need to reset the code. Go into SP Mode: Push in sequence; Clear-107-red stop button(hold this down until display changes and shows "copy etc"), turn machine off(using red power switch, wait 10seconds and turn back on. If you still get the error code the fuser still is not inserted correctly. Hope this helps.
PS: Black spots can also indicate a new drum is needed. It may have a small chip in the surface.