HP LASERJET ENTERPRISE MFP M725dn, Troubleshooting Manual

Page: 465 / 546

Table 2-34 Image defect examples (continued)
Problem Image example Solution
Stop a print job during the print operation before it is complete, then remove
the toner cartridge. Open the photosensitive drum shield, and look at the
toner image on the drum.
◦
If the image is not fully transferring to the page, replace the transfer
roller.
◦
If the toner on the drum is faint, replace the laser/scanner.
6. The transfer roller shaft might be dirty. Remove the transfer roller and clean
the shaft to ensure good contact.
7. If the transfer roller is deformed or damaged, replace the roller.
8. The high-voltage power supply might be damaged. Replace the high-voltage
power supply.
9. The laser/scanner might be damaged. Replace the laser/scanner.
If replacing the laser/scanner does not resolve the problem and the high-
voltage power supply was not replaced (step 8), replace the high-voltage
power supply.
Specks (front or back of
the page is dirty) Specks might appear on a page after a jam has been cleared.
1. The paper might be dirty. Use a new package of paper. Make sure that the
paper is stored correctly. See your product user guide.
2. Print a few more pages to see if the problem corrects itself.
3. Clean the inside of the product and run a cleaning page to clean the fuser.
4. Try using a different type of paper.
5. Check the toner cartridge for leaks. If the toner cartridge is leaking, replace it.
6. The cassette pickup roller might be dirty. Clean the roller. If it cannot be
cleaned, replace the roller.
7.
Repetitive dirt marks can be caused by the registration roller, transfer roller, or
pressure roller. Use the repetitive defects ruler to identify the problem, and
then replace the appropriate assembly.
8.
The media-feed guide, or the fuser-inlet guide might be dirty. Clean the guide.
9. The delivery rollers might be dirty. Clean the rollers.
ENWW
Solve image-quality problems
433