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HP Color LaserJet MFP E77825

Troubleshooting. Image Defects 1

Vertical black band

 

Step Cause Action
1 Charge roller (CR) is contaminated. Check if the CR is contaminated.
Replace the drum unit if there are additional problems.
2 ITB belt is contaminated.
• ITB cleaning is poor.
• ITB cleaning blade is partially broken.
Check if the ITB belt is contaminated.
Replace the ITB cleaner if there are additional problems.
3 The scanner unit is contaminated.
• Scan glass contamination
• Mirror contamination
• CCD sensor contamination
Wipe the contaminated part of the surface with a soft cloth.
CAUTION:The scanner unit contains fragile parts. Use caution while cleaning.

Vertical white band, light band

 

Step Cause Action
1 A foreign substance is between the magnetic roller and
the blade.
No toner on magnetic roller.
Remove the foreign substance.
Make the hook (transparency sheet is recommended.)
Put the hook into the gap between magnetic roller and
blade.
Pull out foreign substances.
2 The developer in the developer unit is empty or the developer unit life has expired. Check the life remaining of the developer unit on the supply information report.
– If its life has expired, replace the developer unit.
Check if the developer layer on magnetic roller is uniform.
– If the developer layer is short, replace the developer unit.
3 The laser beam path is blocked.
(Foreign substance is on the laser scanner assembly window.)
Clean the laser scanner assembly window.
4 The OPC is scratched or contaminated in a vertical direction. Replace the drum unit.
5 ITB cleaner or T2 transfer unit is contaminated with paper dust build up.
- ITB cleaner contamination
- Clean the paper dust stick on a regular basis.
NOTE:The paper dust stick (Callout 1 ) may vary depending on the product.
NOTE:Clean the paper dust stick on a regular basis in order to prevent horizontal light band. Frequent cleaning can help maintain product quality. HP recommends to clean this item when replacing TCU at a minimum.
- T2 contamination (Callout 1) & Image defect

Horizontal periodic black band or dot

 

Step Cause Action
1 Horizontal periodic band or dot (CR 37.7 mm).
- The surface of the Charge Roller (CR) is contaminated.
- CR is scratched.
Clean the contaminated surface on the charge roller with a soft cloth and alcohol.
If the surface is scratched, replace the drum unit.
2 Horizontal periodic band (CR, 37.7 mm).
CR in poor condition.
Replace the drum unit.
3 OPC is damaged. Replace the drum unit.
Error Code
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