EXP Computer C4077-90960 - Manual (Page 306)

Possible Cause Recommended Action
1. Toner cartridge is damaged. If the defect
repeats at any of the following intervals and in
the direction of paper movement, it is associated
with a component inside the toner cartridge. See
note below.
Printed side defects
Toner cartridge drum, 94mm (3 3/4 inches)
Developing roller, 51mm (2 inches)
Back side defect
Charging roller, 38mm (1 1/2 inches)
Inspect the drum for scratches or damage.
Replace the toner cartridge. Use the Repetitive
defect Ruler, Figure 7-25.
2. Transfer Roller has toner on it. If defects
occur on the back of the page at intervals of
61mm (2 3/8 inches), the Transfer Roller may be
dirty. This problem sometimes corrects itself
after a few pages. Clean the Transfer Roller using a dry, lint-free
cloth. DO NOT touch the Transfer Roller with
your fingers. If the problem persists, replace the
Transfer Roller Assembly.
3. Dirty Rollers. Any dirty roller in the paper path
may result in a repetitive print defect. Examine and clean rollers in the paper path
(refer to Chapter 4).
4. Fusing Assembly is dirty or defective. Clean the Fusing Assembly using alcohol. If the
problem persists, replace the Fusing Assembly.
5. Gears are worn, causing slippage or jumping. Inspect the gears driving the toner cartridge and
the Fuser. Replace the Main Drive Assembly if
necessary.
6. Paper does not meet specs. The surface of
the paper may be too coarse, causing repeated
marks. Try a different media or paper lot (see HP
LaserJet Printer Family Paper Specifications
Guide).
Possible Cause Recommended Action
Defective toner cartridge. The photosensitive
drum is wearing out. The line will grow wider,
with cross-hatching. Shaking the cartridge does
not relieve the problem. Replace the toner cartridge.
Table 7-13 Repetitive Defects
Table 7-14 Line at Edge of Paper
7
Troubleshooting
7-69