HPCLJCP1510Repair

Fix HP LaserJet Calibration Problem Status: unbekannt
Beschreibung	How to fix calibration problem of HP LaserJet 1510 Series Printer
Autor:	omicron
Version	1.5
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Objective

The objective of this project is to fix a HP LaserJet CP 1510 Series printer having color calibration issues.

Short version

Problem

• Color calibration of a HP Color LaserJet 1250 Series Printer (e.g. CP 1515n) is not working correctly (see top left part of image)
• All attempts to fix the problem otherwise have failed:
  • Update to latest firmware
  • Repeated calibration done > 3 times
  • NVRAM reset
  • Reset to Factory defaults from menu
• The following other attempts were not done:
  • Replace the ITB assembly (cost reasons)
  • Buy set of original HP toner (cost reasons)

Solution

• Get the service manual (Google for "HP Color Laserjet CP1215 CP1515 CP1518 Service Manual")
• Follow the instructions for removing the Intermediate Transfer Belt (ITB) assembly
• Turn the ITB assembly upside down
• Take a photo of all 3 trimmer positions (labelled VR1, VR1 and VR2 on the two PCBs)
• Find the trimmer labelled VR1 on the right of the two PCBs (the board with 2 trimmers on it)
• Turn VR1 right (for me 90 degrees worked fine)
• Follow the instructions of the service manual for re-installing the ITB assembly
• done

Notes

• This fix will certainly break warranty. Hence, only do it with printers being out of warranty!
• The fix proved to work for a single CP1515n printer. It may have to be modified for other instances.
• If changing VR1 on right PCB does not solve the problem, try the other trimmers (But always remember the original state!)
• When testing the effect of changing the trimmer, you only need to reassemble the following components
  • The ITB itself
  • The print-cartridge drawer stop
  • The Print-cartridge drawer
• But (as always) be careful not to touch any live parts when the printer is connected to power!