HPCLJCP1510Repair - Versionsgeschichte

Omicron am 20. September 2015 um 18:22 Uhr

2015-09-20T18:22:20Z

← Nächstältere Version		Version vom 20. September 2015, 18:22 Uhr
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	\|name = HP CP1515n Color Calibration		\|name = HP CP1515n Color Calibration
	\|kategorie = Sonstiges		\|kategorie = Sonstiges
	\|status = ~~unstable~~		\|status = stable
	\|autor = [[Benutzer:omicron\|omicron]]		\|autor = [[Benutzer:omicron\|omicron]]
	\|beschreibung = Fix Color Calibration of HP CP 1515n Printer		\|beschreibung = Fix Color Calibration of HP CP 1515n Printer

Omicron: /* Long Version */

2015-09-20T18:20:33Z

Long Version

← Nächstältere Version		Version vom 20. September 2015, 18:20 Uhr
Zeile 78:		Zeile 78:

	My next attempt consisted of 4 things (I was quite in despair):		My next attempt consisted of 4 things (I was quite in despair):
	* I temporarily dismounted the front top part of the ITB ~~(see TODO)~~ and remounted it afterwards without doing any real change.		* I temporarily dismounted the front top part of the ITB and remounted it afterwards without doing any real change.
	* I dismounted the two coil springs which seem to tighten the belt and stretched them with two pairs of pliers - for the purpose of increasing the spring stiffness (in a very amateurish way)		* I dismounted the two coil springs which seem to tighten the belt and stretched them with two pairs of pliers - for the purpose of increasing the spring stiffness (in a very amateurish way)
	* I again turned all 3 trimmers in the exact position where the calibration initially worked		* I again turned all 3 trimmers in the exact position where the calibration initially worked
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	Finally, I did some sensitivity analysis of successful calibration to the positions of the 3 trimmers - starting from the now hopefully well-reproducible good position of VR1.		Finally, I did some sensitivity analysis of successful calibration to the positions of the 3 trimmers - starting from the now hopefully well-reproducible good position of VR1.

	~~TODO:~~		As it turned out, I obviously initially hit the correct trimmer position of VR1 by chance: The trimmer position needs to be in a range of about +/- 5-10 degrees to be optimal, i. e. leading to a correct calibration.
	As it turned out, I ~~obviouly~~ initially hit the correct trimmer position of VR1 by chance: The trimmer position ~~must~~ be in a range of about +/- 5-10 degrees to be optimal, i. e. leading to a correct calibration!

Omicron: /* Notes */

2015-09-20T18:18:32Z

Notes

← Nächstältere Version		Version vom 20. September 2015, 18:18 Uhr
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	** The left cover for your own safety, because the high voltage components are located beneath it		** The left cover for your own safety, because the high voltage components are located beneath it
	* But (as always) be careful not to touch any live parts when the printer is connected to power!		* But (as always) be careful not to touch any live parts when the printer is connected to power!
			* Instead of stretching the springs, you can of course replace them by a new one. However, it must be replaced by a spring with the appropriate length, stiffness and diameter, which most people (including myself) do not have at hand.

	=Long Version=		=Long Version=

Omicron: /* Part 2: Springs */

2015-09-20T18:14:52Z

Part 2: Springs

← Nächstältere Version		Version vom 20. September 2015, 18:14 Uhr
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	===Part 2: Springs===		===Part 2: Springs===
	* Remove ~~the 2 springs~~ on ~~the~~ side of the ITB board. The following picture shows one of them in ~~built-in~~ state:<br/>		* Remove one spring on each side of the ITB board. The following picture shows one of them in assembled state:<br/>
	[[File:Feder-eingebaut.jpg\|400px]]		[[File:Feder-eingebaut.jpg\|400px]]
			* The springs are only fixed on one end. The other end (the left end in the above picture) can simply be levered out using a big screwdriver.
			* Afterwards, use two pairs of pliers for stretching the springs. This is done for the purpose of increasing the spring stiffness.
			* It may be sensible to turn the pliers while stretching the spring for preventing an increase or decrease of the diameter of the spring.
			* Afterwards reassemble the springs. This may be a little bit tricky and took me some minutes: I used two screwdrivers: One for tensioning the spring and putting it into the right place and another smaller screwdriver for stripping the spring from the first screwdriver - while pulling the first screwdriver out and leaving the spring in its place.

	==Notes==		==Notes==

Omicron: /* Solution */

2015-09-20T17:57:56Z

Solution

← Nächstältere Version		Version vom 20. September 2015, 17:57 Uhr
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	==Solution==		==Solution==

			===Common===
	* Print diagnostics page using the printer menu (for later comparison).		* Print diagnostics page using the printer menu (for later comparison).
	* Get the service manual (Google for "HP Color Laserjet CP1215 CP1515 CP1518 Service Manual")		* Get the service manual (Google for "HP Color Laserjet CP1215 CP1515 CP1518 Service Manual")
	* Follow the instructions for removing the Intermediate Transfer Belt (ITB)		* Follow the instructions for removing the Intermediate Transfer Belt (ITB)

			===Part 1: Trimmer===
	* Turn the ITB assembly upside down		* Turn the ITB assembly upside down
	* Find the two small PCBs where the wires end		* Find the two small PCBs where the wires end
Zeile 44:		Zeile 48:
	* Done (or try another trimmer position)		* Done (or try another trimmer position)
	* If no trimmer position works, see long version		* If no trimmer position works, see long version

			===Part 2: Springs===
			* Remove the 2 springs on the side of the ITB board. The following picture shows one of them in built-in state:<br/>
			[[File:Feder-eingebaut.jpg\|400px]]

	==Notes==		==Notes==

Omicron: /* Long Version */

2015-08-08T21:10:19Z

Long Version

← Nächstältere Version		Version vom 8. August 2015, 21:10 Uhr
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	Now I again wanted to know, which change was the successful one (i. e. was it the cleaning of the PCB or some mechanical change), I turned the trimmer back to its original position. Now the calibration failed again. But after carefully turning the trimmer again into its known-working position, calibation was successful again.		Now I again wanted to know, which change was the successful one (i. e. was it the cleaning of the PCB or some mechanical change), I turned the trimmer back to its original position. Now the calibration failed again. But after carefully turning the trimmer again into its known-working position, calibation was successful again.

	Finally, I did some sensitivity analysis of the calibation working or not for various trimmer positions. As it turned out, I obviouly initially hit the correct trimmer position of VR1 by chance: The trimmer position must be in a range of about +/- 5-10 degrees to be optimal, i. e. leading to a correct calibration!		Finally, I did some sensitivity analysis of the calibation working or not for various trimmer positions. During this analysis, at some point it did not work again. I then only increased the spring stiffness (again) without changing anything (apart from the "good" VR1 position). Afterwards, it worked again.

			Then I inspected the mechanism which tightens the belt a little bit more carefully. From the beginning on, I noticed two rather loose plastic parts near the springs, which function I could not identify. After having reassembled the springs I noticed that they have to do with the tightening mechanism. The two plastic parts are levers to relax and tighten the ITB. However, I did not found any information about this feature in any document - neither the printer manual nor the service manual! Additionally, this tightening mechanism can be accessed even if the printer is fully mounted - with only the front door open (TODO: pictures!). Hence, it may have been enough to relax and re-tighten the ITB after re-assembling the printer instead of having to increase the spring stiffness at all! The re-tightening might increase the fit of the ITB assembly inside the printer.

			Hence the original problem seems to have 2 causes:
			* The spring stiffness of the ITB springs or the correct fit of the ITB in reassembled state
			* The position of VR1

			Finally, I did some sensitivity analysis of successful calibration to the positions of the 3 trimmers - starting from the now hopefully well-reproducible good position of VR1.

			TODO:
			As it turned out, I obviouly initially hit the correct trimmer position of VR1 by chance: The trimmer position must be in a range of about +/- 5-10 degrees to be optimal, i. e. leading to a correct calibration!

Omicron: /* Solution */

2015-08-08T20:46:48Z

Solution

← Nächstältere Version		Version vom 8. August 2015, 20:46 Uhr
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	* Take a photo of the positions of all 3 trimmer (labelled VR1, VR1 and VR2 on the two PCBs)		* 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]]		* 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 ~~(for~~ me, 90 degrees worked. However, the calibration seems to be quite sensitive to the exact position. Hence you have do some trial-and-error here. Example:<br />[[File:VR1-Changed-Good.jpg\|200px]]		* Turn VR1 clockwise. For me, 90 degrees worked. However, the calibration seems to be quite sensitive to the exact position. Hence you have do some trial-and-error here. Example:<br />[[File:VR1-Changed-Good.jpg\|200px]]
	* Follow the instructions of the service manual for re-installing the ITB assembly		* Follow the instructions of the service manual for re-installing the ITB assembly
	* Connect printer to power		* Connect printer to power

Omicron am 8. August 2015 um 19:47 Uhr

2015-08-08T19:47:52Z

← Nächstältere Version		Version vom 8. August 2015, 19:47 Uhr
Zeile 2:		Zeile 2:
	\|name = HP CP1515n Color Calibration		\|name = HP CP1515n Color Calibration
	\|kategorie = Sonstiges		\|kategorie = Sonstiges
	\|status = ~~experimentell~~		\|status = unstable
	\|autor = [[Benutzer:omicron\|omicron]]		\|autor = [[Benutzer:omicron\|omicron]]
	\|beschreibung = Fix Color Calibration of HP CP 1515n Printer		\|beschreibung = Fix Color Calibration of HP CP 1515n Printer

Omicron am 8. August 2015 um 19:45 Uhr

2015-08-08T19:45:56Z

← Nächstältere Version		Version vom 8. August 2015, 19:45 Uhr
Zeile 2:		Zeile 2:
	\|name = HP CP1515n Color Calibration		\|name = HP CP1515n Color Calibration
	\|kategorie = Sonstiges		\|kategorie = Sonstiges
	\|status = ~~in development~~		\|status = experimentell
	\|autor = [[Benutzer:omicron\|omicron]]		\|autor = [[Benutzer:omicron\|omicron]]
	\|beschreibung = Fix Color Calibration of HP CP 1515n Printer		\|beschreibung = Fix Color Calibration of HP CP 1515n Printer

Omicron: /* Notes */

2015-08-03T21:39:41Z

Notes

← Nächstältere Version		Version vom 3. August 2015, 21:39 Uhr
Zeile 53:		Zeile 53:
	** The print-cartridge drawer stop		** The print-cartridge drawer stop
	** The Print-cartridge drawer		** The Print-cartridge drawer
			** The left cover for your own safety, because the high voltage components are located beneath it
	* But (as always) be careful not to touch any live parts when the printer is connected to power!		* But (as always) be careful not to touch any live parts when the printer is connected to power!