Quelltext der Seite HPCLJCP1510Repair

{{Infobox Projekt
|name            = HP CP1515n Color Calibration
|kategorie       = Sonstiges
|status          = in development
|autor           = [[Benutzer:omicron|omicron]]
|beschreibung    = Fix Color Calibration of HP CP 1515n Printer
|image           = Logo-LaserJet-Calibration-Fix.jpg
|imagesize       = 280
|version         = 1.0
}}
[[Category:Sonstiges]]
{{TOCright}}

=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 1510 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 (> 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==
* Print diagnostics page using the printer menu (for later comparison).
* Get the service manual (Google for "HP Color Laserjet CP1215 CP1515 CP1518 Service Manual")
* Follow the instructions for removing the Intermediate Transfer Belt (ITB)
* Turn the ITB assembly upside down
* Find the two small PCBs where the wires end
* Take a photo of the positions of all 3 trimmer (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). Example:<br />[[File:VR1-Original.jpg|200px]]
* Turn VR1 clockwise about 90 degrees (other angles could work, too: Try it out!). Example:<br />[[File:VR1-Changed-Good.jpg|200px]]
* Follow the instructions of the service manual for re-installing the ITB assembly
* Connect printer to power
* Start a color calibration
* Print diagnostics page and compare with diagnostics page before the fix
* Done (or further experiments needed - see notes)

==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!

=Long Version=

This will (or may) be writen as soon as the author finds time and motivation...