118 Chapter 6 Troubleshooting C4170-90959
Sealing tape left in
Toner Cartridge.
Remove the sealing tape.
Empty or defective
Toner Cartridge.
1) If unsure, weigh the cartridge.
Full weight = 1130 grams (39.9 oz.)
Empty weight = 925 grams (32.6 oz.)
Note: Some toner may reside in the waste toner
cavity, affecting the weight of the cartridge. The
weights above include waste toner.
2) Perform the “Half Self-Test Functional Check”
(page 132) or try a known good Toner Cartridge.
Replace the Toner Cartridge if necessary.
Poor contact between
the developing bias
contact on the Engine
Controller Assembly
and the cartridge
contact
Inspect the contacts. If the parts are damaged,
replace them.
Engine Controller
Assembly is defective.
1) Replace the DC Bias Voltage Contacts. See “DC
Bias Voltage Contacts Replacement” (page 248).
2) Replace the Engine Controller Assembly and the
Intermediate PCB.
No drum ground path. With no ground path the drum cannot discharge. The
negative charge on the drum repels toner, and
leaves a white page with bubble print. See “Faded
Print/Bubbles” (page 123).
1) Check the drum ground. See “DC Bias Voltage
Contacts Replacement” (page 248)
2) Replace the Engine Controller Assembly and the
Intermediate PCB.
3) Replace the gear plate.
Defective
Intermediate PCB.
Replace the Intermediate PCB.
Blank Spots
Possible Cause Action
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.
Blank Page (continued)
Possible Cause Action
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