HP Pro 300 M351a User's Guide download pdf (Page 187)

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 Distance between defects (mm) Type of defects

Developing roller

About 22 Dropouts

Dark, sharp bands

Primary charging roller

About 26 Dropouts

RS roller About 29 Dropouts

Secondary transfer roller About 47 Dropouts

Dirt on the back of page

Fuser film About 58 Dropouts

Dirt on page

Loose toner

Pressure roller About 63 Dirt on page

Dirt on the back of page

Loose toner

ITB drive roller About 76 Spots

Photosensitive drum

About 95 Dropouts

Dirt on page

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

Print troubleshooting

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HP Pro 300 M351a User's Guide Page 187