In order to clear error SC542, you can perform the following:
Press and hold online + escape, then power on.
Use up and down arrow keys to select SP2
Press Enter
Use up and down arrow to locate SP5
Press Enter
Use up and down arrow keys to select 810
Press Enter
Confirm the selection
Power off and on.
Please let us know if this works for you.
Also, check all of the connectors on the fuser connector and receptacle, just to make sure that full contact is being made. read this TSB on updating the thermistors:
TSB_106 SC555_SC545_SC542 Occurs.pdf (need to register to views).
Hope helps.
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