Background Contamination - Xerox 7300B - Phaser Color Laser Printer Service Manual

Background Contamination

Troubleshooting Procedure
Step Question or Action
1 Is the printer in direct sun light?
2 Does the background appear to be in only one
of the primary colors?
3 Remove the Imaging Unit of the problem color.
Visually inspect the Imaging Unit's green OPC
drum for toner contamination.
Is there a film of toner across the surface of the
drum?
4 Verify the printer is operating within it's
environmental specifications, see
"Environmental Specifications" on page 1-15.
High humidity environments will increase the
degree of background toner.
5 Is the customer printing on high-gloss media?
6 Were the Imaging Units exposed to light for an
extended amount of time?
7 Use service diagnostics to help verify both
Power Supply Fans are functioning.
Heat build-up under the Imaging Units can
cause toner to stain the background.
Are the fans operating correctly?
Troubleshooting
There is a very light covering of toner
across the entire page. Background
contamination can appear in one of the
primary colors or gray.
Note: Printing on some
speciality papers, such as
glossy finish paper, may show
background contamination.
7300-024
.
Yes No
Move the printer. Go to step [2].
Go to step [3]. Go to step [4].
Replace the Go to step [4].
Imaging Unit.
Go to step [5]. Advise the
customer of the
environmental
specifications
for the printer.
Advise the Go to step [6].
customer of the
limitation of this
printer.
Replace the Go to step [7].
Imaging Unit.
Go to step [8]. Replace the
defective fan.
3-91