Action Yes No
Step 6
Check the LSU for damages, and replace if necessary.
Installation note: Mechanical and electronic LSU adjustments
are required to complete the installation of the LSU. See
“Printhead assembly adjustments” on page 261.
Does the problem remain?
Go to step 7. The problem is
solved.
Step 7
Check the LSU and controller board connector for damaged or
bent pins. Replace the part with damaged pins.
Does the problem remain?
Go to step 8. The problem is
solved.
Step 8
Replace the controller board.
Does the problem remain?
Contact the next
level of support.
The problem is
solved.
121 errors
121 error messages
Error code Description Action
121.07 Fuser has been on for more than allowed after a
gap blowout, and the temperature is still too cold.
Go to
“Fuser service check” on page 136.
121.08 Fuser was under temp when page was in fuser.
121.20 Fuser undertemp during steady state control. Can
occur in printing or standby modes.
121.22 Fuser did not warm enough to start line voltage
detection.
121.23 Fuser took too long to heat to line detection temp.
121.24 Fuser never reached detection temperature.
121.25 After line voltage detection, control did not roll
over to steady state control in time.
121.26 Failed to reach temperature during warm up.
121.28 Failed to reach EP warm up temperature in time.
121.29 Fuser failed to reach pre‑heat temperature for
motor start during warm up.
7016
Diagnostic information
135
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