Lexmark W820 Service Manual page 118

Step Actions and Questions
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
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.
Step Actions and Questions
1 RESET
1. Switch off printer main power.
2. Wait one minute.
3. Switch on printer main power.
Does the 921 error code appear?
2 FUSER REPLACEMENT
Replace the
Does the error code appear?
3 MCU PWB REPLACEMENT
Replace the
Does the error code appear?
4 AC DRIVER PWB REPLACEMENT
Replace the
Does the error code appear?
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
2-22
Service Manual
"I/O PWB" on page
"Fuser Assembly" on page 4-65
"Engine Board (MCU PWB)" on page 4-92
"AC Driver PWB 120/230 VAC" on page 4-86
"I/O PWB" on page
4025-XXX
4-89.
4-89.
Yes No
Yes No
Go to step 2 Treat as an
intermittent
problem with
either the
Fuser, the AC
Driver, or the
MCU PWB
Go to step 3 Problem
solved
Go to step 4 Problem
solved
Go to step 5 Problem
solved