HP color laserjet 4500 Manuale Utente
EN
Repetitive defects troubleshooting 187
9
Repetitive defects troubleshooting
Repetitive defects are defects that occur on the page. Most repetitive
defects are caused by problems with one of the following:
defects are caused by problems with one of the following:
See the service manual for the repetitive defect ruler. See page 188 for
the defect spacing chart.
the defect spacing chart.
CAUTION
Do not expose the imaging drum to light, and be careful not to scratch
or get fingerprints on the drum surface during cleaning. Do not blow
on the imaging drum.
or get fingerprints on the drum surface during cleaning. Do not blow
on the imaging drum.
Imaging drum defects
Causes:
•
Damage such as scratches or dents on the imaging drum. These
usually appear as black or white marks on the page.
usually appear as black or white marks on the page.
•
Paper dust adhering to the imaging drum. These usually appear as
white marks in the dark printed areas of the page.
white marks in the dark printed areas of the page.
•
Exposure of portions of the imaging drum to light. This causes light
sections in the printed output. The life of the imaging drum is
shortened by exposure to light.
sections in the printed output. The life of the imaging drum is
shortened by exposure to light.
Actions:
•
Print at least four configuration pages to determine if the defect
repeats in the same horizontal orientation.
repeats in the same horizontal orientation.
•
Inspect the imaging drum for scratches, dents, or other damage.
Replace if needed.
Replace if needed.
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Developer roller
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Fuser
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Charge roller
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Imaging drum
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Cleaning roller
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Transfer belt
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Transfer roller