Hp laserjet 4 not printing dark enough - LaserJet HP Office Equipment & Supplies

Inky Fingers

• 705 Answers
• Posted on Dec 30, 2007

SOURCE: Not enough memory LaserHet 6mp Printer HP

Donna,

Yes you can add more memory to this printer. It slots into the formatter (under left side cover)

Memory upgrades
1 MByte—C3130A
2 MByte—C3131A
4 MByte—C3132A
8 MByte—C3133A
16 MByte—C3146A
Add up to 32 MBytes of memory to the HP LaserJet 5MP/6MP printers, for a total of 35 MBytes..

SOURCE: HP LaserJet 4 printing vertical lines all down and across page

sounds like your fuser assembly needs to be repaired. you can get the parts online fot about $40USD.

SOURCE: HP 5550 Laserjet prints dark

The only time I saw a color laser Printing darker than normal the issue was tranfer belt. The condition you describe matches the problem I was involved in and the tranfer kit fixed the problem.
Hope this helps

SOURCE: HP LaserJet 2200 Series PCL huge dark smudge

Replace toner cartridge. If problem persist replace fuser unit. P/N # RG5-5559

SOURCE: HP LJ 2600 "dirty" printing

Hi,

If the toner cartridges are "refills" that might explain some of your print quality issues. Unfortunately, HP only has 2 replacement parts for that model, the fuser and the ETB (Transfer belt) both would require a technician to replace. Check the transfer belt of any tears or punctures. Careful not to touch it, oils from your skin can cause quality issues as well. If at all possible replace all the toners with ones that were working fine.