124 Chapter 6 Troubleshooting C4170-90959
High voltage contact
springs are dirty or
defective. The high
voltage contacts are
mounted on the
Engine Controller
Assembly and
protrude into the toner
cartridge cavity.
Check the contacts for functionality. If damaged,
replace the Engine Controller Assembly and the
Intermediate PCB.
Engine Controller
Assembly is defective.
Replace the Engine Controller Assembly and the
Intermediate PCB.
Gray Background
Possible Cause Action
Wrong toner density
setting.
Adjust the toner density setting in the printer driver.
Make sure EconoMode is off.
Printing on envelope
seams. Printing on an
envelope seam can
cause a background
scatter problem.
Move the text to an area without seams. If not
printing on seams, try a higher print density setting.
See “Media Troubleshooting” (page 134).
Paper does not meet
printer specifications
or is stored
improperly.
1) Print a few more pages to see if the problem
corrects itself.
2) Turn over the stack of paper in the tray. Also try
rotating the paper 180 degrees.
3) Check the paper (or other print media) type and
quality. Replace the paper, and advise the customer
to use the recommended paper and store it properly.
See “Media Specifications” (page 28).
Inside of printer is
dirty (toner may have
leaked out of the toner
cartridge).
Clean inside of printer (see “Cleaning the Printer”
(page 61). Install a new Toner Cartridge if leaking.
Printer’s operating
environment does not
meet specifications.
Make sure the printer’s operating environment meets
specifications. See “Operating Environment”
(page 26).
Faulty Toner
Cartridge.
Replace the Toner Cartridge.
See also “Dark Print” (page 121).
Poor contact between
the primary bias
contact on the Engine
Controller Assembly
and toner cartridge
contact.
Inspect and clean the contacts. Replace the contacts
if the problem persists after cleaning. See “DC Bias
Voltage Contacts (Leaf Springs) Removal”
(page 245).
Faded Print/Bubbles (continued)
Possible Cause Action
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