2-34 Phaser 8400/8500/8550/8560 Color Printer Service Manual
Theory of Operation
Paper Preheater Cleaning (Remove Print Smears)
This customer-initiated cleaning procedure is selected by choosing Remove
Print Smears on the Control Panel’s Print Quality Problems menu. This
procedure cleans ink out of the Preheater that may have been deposited
there. Heavier-weight, high-grade quality paper works best for this procedure.
Ink can also be deposited if a jammed print, with ink on it, was pulled
backwards through the Preheater.
In the Preheater cleaning cycle, these events take place:
1. The customer selects the Remove Print Smears menu item.
2. The printer overheats the Preheater to about 110
o
C, softening ink
trapped inside the Preheater. Ordinarily the Preheater runs at
temperatures of between 60
o
C and 70
o
C.
3. The printer picks and passes approximately 12-24 sheets of paper
through the print path. The first few sheets absorb and remove ink from
the Preheater. The printer continues to pass sheets of paper though to
cool the Preheater until normal operating temperature is reached. If
duplex capability is enabled, 5 sheets of paper go through the simplex
path and up to 20 sheets go through the duplex path.
4. The printer returns to the Print Quality Problems menu.
Because of the higher paper temperatures involved, this function can clean
the Drum of ink deposits caused by a contaminated blade on the Drum
Maintenance Kit.
Transfix Roller Oiling
Oiling the Transfix Roller prevents ink from sticking to it. Every 50 prints, the
printer performs a Transfix Roller oiling cycle. During this cycle, oil is applied
to the Drum as it would be during a print cycle. The Transfix Roller then lowers
against the Drum and the Drum rotates, transferring some of the oil to the
Transfix Roller. Finally, the Transfix Roller raises to its standby position.
Drum Cleaning - Chase Page
The printer performs a Drum cleaning with a chase page automatically
anytime a paper jam occurs. The chase page collects any image, which may
not be complete, off the Drum. The printer then attempts to reprint the print
that jammed. The chase page is processed the same as a regular print,
except that the Drum is not oiled and no image is printed on the drum (since
an image is already printed on the Drum).
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