The transfer belt may accumulate excess toner on its rollers causing a random mechanical banding. If you notice buildup on the rollers, replace the transfer kit.
The imaging drum may have been exposed to light, and will need to be replaced.

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Banding — horizontal

￿￿Banding — vertical

The blade on the toner cartridge can develop notches over time. If you observe severe notching, replace the toner cartridge.

As the imaging drum gets older, the charge roller doesn’t charge the imaging drum as well as it used to. If you notice buildup or contamination on the charge roller, replace the imaging drum.

Black lines

The toner cartridge is defective, and should be replaced.

￿The toner cartridge is not installed properly. Reinstall the toner cartridge.

The fusing assembly is contaminated or damaged. Replace the

￿fuser kit.

The imaging drum is damaged or the waste toner collection in the

￿drum is full. Replace the imaging drum.

198 Solving problems with the printer

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Image 199
HP 4550 manual Banding horizontal, Black lines