Print Troubleshooting; Print-Quality Troubleshooting Tools; Repetitive Image Defects Ruler; Calibrate The Product - HP LaserJet Pro 400 Reference

Print troubleshooting

Print-quality troubleshooting tools

Repetitive image defects ruler

If the product output has a consistent, repetitive defect, then use the table in this section to determine
which part needs to be cleaned or replaced based on the measured distance between the repetitions
of the defect.
NOTE: Spots can be dark or white (dropouts), bands can be all shapes and sizes.
Component
Developing roller
Primary charging roller
RS roller
Secondary transfer roller
Fuser film
Pressure roller
ITB drive roller
Photosensitive drum
1 The primary charging roller, photosensitive drum, and developing drum cannot be cleaned. If these rollers cause a
repetitive defect, replace the corresponding cartridge, either the imaging-drum cartridge, or developing cartridge.

Calibrate the product

1. Use the arrow buttons to select the System Setup menu, and then press the OK button.
2. Use the arrow buttons to select the Print Quality menu, and then press the OK button.
3. Use the arrow buttons to select the Calibrate Color item, and then press the OK button.
4. When the display shows the Calibrate Now message, and press the OK button.
ENWW
Distance between defects (mm)
About 22
1
About 26
1
About 29
About 47
About 58
About 63
About 76
About 95
1
Type of defects
Dropouts
Dark, sharp bands
Dropouts
Dropouts
Dropouts
Dirt on the back of page
Dropouts
Dirt on page
Loose toner
Dirt on page
Dirt on the back of page
Loose toner
Spots
Dropouts
Dirt on page
Print troubleshooting
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