Xerox DOCUPRINT N4525 Service Quick Reference Manual page 156

Table 1-94 Background (cont'd.)
Step Actions and Questions
3 IMAGE TRANSFER INSPECTION
1. Remove the Rear Cover (RRP 1-5).
2. Generate a Blank Test Print and switch OFF printer
power halfway through the print cycle.
3. Open the Left Upper Door.
4. Open the Drum Shutter.
5. Hand rotate (counter clockwise) the Drum Drive Motor
flywheel to advance the Drum far enough so you can
see the developed image area on the Drum before it
reached Transfer.
Before Transfer was the drum clean and
without noticeable background toner, but there
was background visible on the paper after
Transfer?
4 FUSER INSPECTION
1. Generate another Blank Test Print and switch OFF
printer power when the print is halfway through the
Fuser.
2. Open the Left Upper Door.
3. 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?
5 The following printer components and areas are
associated with this specific problem. One or more of
these components or areas may have failed partially or
completely. If you cannot isolate this problem using the
steps in this Fault Isolation Procedure, replace each
component 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


High Voltage Power Supply Assembly (RRP


1-69)
Print Engine Controller Board (RRP 1-72)


Input/Output Board (RRP 1-70).


1-134 DocuPrint N4525 Network Laser Printer - Service Guide
Yes No
Replace the Go to step 4
Bias Transfer
Roller
Assembly
Replace the Go to step 5
Fuser
Assembly