2-22 Service Manual
4025-XXX
Error Code 921
There is a problem with the Fuser.
Logic Control on the MCU PWB detected the Fuser temperature exceeded the
temperature set for Fuser overheat.
5 The following printer FRUs and areas are associated with this
specific problem. One or more of these FRUs or areas may
have failed partially or completely. If you cannot isolate this
problem using the steps in this Service Check, replace each
FRU or troubleshoot each area listed below, one at a time, until
you isolate and solve the problem.
• Wiring and connectors linking the FRUs
• I/O PWB - Go to “I/O PWB” on page 4-89.
Step Actions and Questions Yes No
1 RESET
1. Switch off printer main power.
2. Wait one minute.
3. Switch on printer main power.
Does the 921 error code appear?
Go to step 2 Treat as an
intermittent
problem with
either the
Fuser, the AC
Driver, or the
MCU PWB
2 FUSER REPLACEMENT
Replace the “Fuser Assembly” on page 4-65
Does the error code appear?
Go to step 3 Problem
solved
3 MCU PWB REPLACEMENT
Replace the “Engine Board (MCU PWB)” on page 4-92
Does the error code appear?
Go to step 4 Problem
solved
4 AC DRIVER PWB REPLACEMENT
Replace the “AC Driver PWB 120/230 VAC” on page 4-86
Does the error code appear?
Go to step 5 Problem
solved
5 The following printer FRUs and areas are associated with this
specific problem. One or more of these FRUs or areas may
have failed partially or completely. If you cannot isolate this
problem using the steps in this Service Check, replace each
FRU or troubleshoot each area listed below, one at a time, until
you isolate and solve the problem.
• Wiring and connectors linking the FRUs
• I/O PWB - Go to “I/O PWB” on page 4-89.
Step Actions and Questions Yes No
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