LSU service check
Action Yes No
Step 1
Check the LSU cables JLSU1 and J6 for proper connection.
Are they properly connected?
Go to step 2. Reseat the cables.
Step 2
Inspect the LSU cables and connectors.
Are they free of damage?
Replace the controller
board. See “Controller
board removal” on
page 257.
Replace the LSU. See
“Laser scanning unit
(LSU) removal” on
page 328.
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 120.
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
119
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