Xerox Phaser 7400 Service Manual

Print-Quality Troubleshooting 5-25
Residual Image, Ghosting or Hot Offset
There are faint, ghostly images appearing on the page. The images may be either from
a previous page or from the current page. This type of artifact can be related to the
percent coverage called out in the file being printed. If the colors are offset by less
than 10 mm, this represents mis-registration, not ghosting.
Ghosting: This can be the Imaging Unit (green roller) where a residual image is left
on the green film, which is then deposited further down the page. This is most
noticeable on images that have a dark background with light text. The text is ghosted
down the page at 94 mm intervals. This is caused by a defective Imaging Unit.
Ghosting every 49 mm is caused by the developer roller and is a limitation of the
design; therefore, technicians should not replace Imaging Units for this type of
ghosting.
Hot Offset: This can be characterized by a repeating image every 87.3 mm or 124
mm. The Fuser temperature is set too high for the given media and the toner adheres
to the Fuser rollers causing the image to be deposited further down the page or on the
following pages.
Hot Offsetting and Fuser temperature. Offsetting occurs on media if the fuser’s
temperature setting does not match the media type loaded in the tray.
Initial Actions:
■ Verify the correct media type is set at the Control Panel
■ Print an internal page to see if ghosting appears there as well.
■ Make sure the customer is using TekColor correction (limiting color to max
240%). Other graphic applications can exceed 240%.
■ Try printing with fresh media from a recently opened ream.

Xerox Phaser 7400 Specifications

General

Color	Yes
Print technology	Laser
Maximum resolution	600 x 1200 DPI
Time to first page (black, normal)	12 s
Print speed (black, normal quality, A4/US Letter)	40 ppm
Print speed (color, normal quality, A4/US Letter)	36 ppm
Storage media	HDD
Internal memory	512 MB
Processor model	PowerPC
Maximum internal memory	1 MB
Internal storage capacity	20 GB
Total input capacity	800 sheets
Maximum input capacity	3000 sheets
Paper tray 2 input capacity	350 sheets
Auto document feeder (ADF) input capacity	1650 sheets
Maximum print size	297 x 420 mm
Paper tray media types	Envelopes, Labels, Transparencies
Non-ISO print media sizes	Executive (184 x 267mm), Folio (media size), Letter (media size), Statement (140 x 216mm), Legal (media size)
Maximum ISO A-series paper size	A3
Power requirements	100-240V, 50/60Hz
Networking features	Fast Ethernet
Supported media weight(s)	270 g/m²
Maximum operating temperature range (T-T)	10 - 32 °C
Certification	FCC p.15 A, CE
Storage temperature (T-T)	-20 - 60 °C
Operating temperature (T-T)	-4 - 140 °F
Storage relative humidity (H-H)	10 - 95 %
Operating relative humidity (H-H)	20 - 80 %
Maximum duty cycle	150000 pages per month

Weight and Dimensions

Dimensions (WxDxH)	1438 x 623 x 975 mm