Lexmark W820 Service Manual page 117

Error Code 917
There is a problem with the ESS Fan.
Logic Control on the MCU PWB detected a problem with the ESS Fan.
Step Actions and Questions
1 +24VDC CHECK
Measure the voltage between J408-1 and FGMCU PWB.
Is there +24VDC between J408-1 and FG on the MCU
PWB?
2 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 920
There is a problem with the Fuser.
Logic Control on the MCU PWB detected that the Thermistor remained on for longer than
the specified time.
Step Actions and Questions
1 FUSER WARM-UP
1. Switch off printer main power.
2. Remove the Fuser Full Cover so you can observe the Heat Lamps.
3. Switch on printer main power and observe the ends of the Fuser
Assembly.
Do the Heat Lamps glow?
2 FUSER AC POWER
1. Switch on printer main power.
2. Measure the AC voltage between J30 and FG and J32 and FG and
J33 and FG on the AC Driver PWB.
Is there 110VAC present?
3 MCU PWB REPLACEMENT
Replace the "Engine Board (MCU PWB)" on page 4-92
Does the error code appear?
4 FUSER REPLACEMENT
Replace the "Fuser Assembly" on page 4-65
Does the error code appear?
4025-XXX
"I/O PWB" on page 4-89.
Yes No
Replace the Go to Step 2
"Fan
Assembly"
on page 4-84
Yes No
Go to step 4 Go to step 2
Go to step 3 Replace the
"AC Driver
PWB 120/230
VAC" on
page 4-86
Go to step 4 Problem
solved
Go to step 5 Problem
solved
Diagnostic Information
2-21