Diagnostic Information 2-21
4025-XXX
Error Code 917
There is a problem with the ESS Fan.
Logic Control on the MCU PWB detected a problem with the ESS Fan.
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 Yes No
1 +24VDC CHECK
Measure the voltage between J408-1 and FGMCU PWB.
Is there +24VDC between J408-1 and FG on the MCU
PWB?
Replace the
“Fan
Assembly”
on page 4-84
Go to Step 2
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 “I/O PWB” on page 4-89.
Step Actions and Questions Yes No
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?
Go to step 4 Go to step 2
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?
Go to step 3 Replace the
“AC Driver
PWB 120/230
VAC” on
page 4-86
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 FUSER REPLACEMENT
Replace the “Fuser Assembly” on page 4-65
Does the error code appear?
Go to step 5 Problem
solved
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