Rap 7.38 Horizontal Band Deletions - Xerox DocuPrint N24 Service Manual

RAP 7.38 Horizontal Band Deletions

1 The paper is smooth (not wrinkled) and undamaged.
Y N
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Replace with fresh, dry paper.
2 Install a new EP Cartridge (PL 7.2). The problem is still present.
Y N
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Problem solved.
3 Remove the Upper Rear Cover Assembly (REP 4.1.3). Generate a System Controller Test Print
(5.5.2.2.2) for Version 1.7X and below, (5.6.2.2.2) for Version 1.8X, or (5.7.2.12.2) for Version 2.0
and switch OFF printer power halfway through the print cycle. Open the Left Upper Cover. Open
the Drum Shutter. Hand rotate (counterclockwise) the Main Drive Motor to advance the Drum far
enough so you can see the developed image area on the Drum before it reached Transfer.
Before Transfer, the toner image on the drum was normal and without horizontal band deletions.
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Replace the HVPS Assembly (REP 4.10.4). If the problem is still present, refer to the wiring
diagrams Section (6) and check for a broken wire or loose connection between
components in the Xerographic sections of the printer.
4 Generate another System Controller Test Print and switch OFF printer power when the print is
halfway through the Fuser. Open the Left Upper Cover. Examine the paper areas before the
image enters the Fuser. The image on the paper is normal before it enters the Fuser (no
horizontal band deletions).
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Replace each component listed below, one at a time, until the problem disappears.
Replace the BTR assembly (REP 4.5.2).
EP Cartridge Connector and Contact Springs (PL 7.2)
Printer Engine Controller PWB (REP 4.10.6).
5 Generate another System Controller Test Print and switch OFF printer power when the print is
halfway through the Fuser. Open the Left Upper Cover. Examine the paper areas after the image
exits the Fuser. There are horizontal band deletions visible when it exits the Fuser.
Y N
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Problem solved.
6 Replace the Fuser Assembly (REP 4.7.1).
Repair Analysis Procedures (RAP)
PROBLEM
There are areas of the image that are extremely light or missing entirely. These
missing areas form wide bands that run horizontally across the page,
perpendicular with the direction of paper travel.
2/2000
7-60 DocuPrint N24, N32, N40, N3225, and N4025