I found some information on this error at
http://www.fortc.com/2007/06/17/ricoh-cl4000dn-error-code-sc542/
According to this website, the error code is due to a fuser temperature problem.
The Fix
In order to clear error SC542 follow these steps:
- Press and hold online + escape, then power on.
- Use up and down arrow keys to select SP2
- Press Enter
- Use up and down arror to locate SP5
- Press Enter
- Use up and down arrow keys to select 810
- Press Enter
- Confirm the selection
- Power off and on.
Kindly rate this solution, thanks!