Diagnostic Information 2-71
4025-XXX
Toner on Back of Print
There is toner contamination on the back of the fused sheet of paper.
THE PRINTER DISPLAYS NO ERROR CODE.
4 FUSER INSPECTION
Generate another Test Print and switch OFF printer power
when the print is halfway through the Fuser.
Open the Left Upper Cover.
Examine the paper before it enters the Fuser and after it exits
the Fuser.
Is paper clean before it enters the Fuser, but there is
background on the paper when it exits the Fuser?
Replace the
“Fuser
Assembly”
on page 4-65
Go to step 5
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.
• Replace the paper with another brand of paper
• HVPS Assembly - Go to “High Voltage Power Supply
(HVPS) Assembly” on page 4-88.
• MCU PWB - Go to “Engine Board (MCU PWB)” on
page 4-92.
• I/O PWB - Go to “I/O PWB” on page 4-89.
Step Actions and Questions Yes No
1 PAPER JAM HISTORY
Frequently a paper jam or clearing a paper jam may result in
some minor toner contamination of the paper path.
Did you just clear a paper jam?
Run 30 Test
Prints to clear
the paper
path of
residual toner
Go to step 2
2 PAPER TRAY INSPECTION
Inspect all of the paper trays for loose toner on top of and
under the paper stack.
Is there toner in any of the paper trays?
Clean the
trays and
replace all of
the paper with
new paper
Go to step 3
Step Actions and Questions Yes No
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