Tektronix Phaser 780 Color, Service Quick Reference Manual

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58
Phaser 780 Color Printer
Unfused image or image easily rubs off of page
The toner image is not completely
fused to the paper. The image
easily rubs off. The printer displays
no error code.
1.
Is the image density very
light? If light, but not blank,
go to the earlier topic “Light
(undertone) prints” on
page 44.
2.
Check the media weight and
settings at the printer driver.
3.
Check the defaults set at the
front panel for media size
and type.
4. Is the printed image fused to
the paper. If not, replace the
fuser.
5. Replace the low voltage
power supply
6. Replace the engine control board
Toner on back of print
There is toner on the back of the
printed sheet of paper.
1.
Clean the printer interior
2.
Inspect the paper that is loaded
in the paper trays. Is the paper
clean and free of toner?
3. Generate a test print and open
the front cover just before the
sheet of paper reaches the
second bias transfer roller, about
one second after the registration
solenoid actuates.
4.
Slide the paper feeder out of the
printer and inspect the back of
the sheet of paper. Is the back of
the sheet of paper clean and free
of toner? If not clean the paper
feeder and its metal and rubber
registration rollers.
5.
Generate a test print and open the front cover just before the sheet of
paper reaches the fuser.
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