Lexmark W820 Service Manual page 87

Step Actions and Questions
2 PAPER INSPECTION
Inspect the envelopes that are loaded in the Envelope Tray.
Are the envelopes that are loaded in the Envelope Tray
wrinkled or damaged?
3 ENVELOPE FEED TEST
Enter Diagnostic Mode, Input Tray Test, Envelope.
Load envelopes and select "Single."
A single envelope should feed and exit into the standard bin.
Did a single envelope feed?
4 +24VDC CHECK
Measure the voltage between P/J700-7 and P/J700-12 on the
Envelope PWB.
Is there +24VDC between P/J700-7 and P/J700-12?
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, one at a time, until you isolate
and solve the problem.
•
Wiring and connectors linking the FRUs
•
Envelope Feeder Option - Go to
page 2-2.
•
MCU PWB - Go to the Printer Service Manual for the
Removal and Replacement Procedure.
•
I/O PWB - Go to the Printer Service Manual for the Removal
and Replacement Procedure.
4025 Options
"Envelope Feeder" on
Yes No
Replace the Go to step 3
envelopes
with new
envelopes
Problem Go to step 4
solved
Go to step 5 Use the Block
Diagrams in
the printer
service
manual to
troubleshoot a
loss of
+24VDC from
the MCU
PWB.
Diagnostic Information
2-5