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HP LaserJet Quick Reference Service Manual Page 286

Volume i.
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User manual - 449 pages
Manual - 432 pages
Software manual - 418 pages


4L, 4P
The first dot row of the page is not 2 mm (+/- 0.5 mm) from the
leading edge of the page.
– A registration adjustment is required (VR301 on DC Controller).
Drive gears are worn or broken.
Pickup, oblique, or registration rollers are worn.
Light Print/Faded Print
All Printers
The media does not meet HP specifications.
The toner cartridge is low on toner or empty.
The print density is improperly set.
EconoMode is turned on.
The transfer roller is defective.
The HV PCA or HV contact assembly is defective.
The DC controller is defective.
2686A, 2686D
The transfer corona assembly is defective.
The laser power is low.
– Adjust the laser power; replace if necessary.
The HV power supply is defective.
The DC controller PCA is defective.
The drum sensitivity microswitch (MS3, MS4) is faulty.
– Replace MS3, MS.
284 – Image defects


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