I need to know what the part number is for the maintenance kit for work centre 4150

depends on your location , i would suggest consulting Sharp website for recommended service centres

Try this link:

http://www.support.xerox.com/SRVS/CGI-BIN/WEBCGI.EXE?St=19,E=0000000005959817498,K=8550,Sxi=0,Case=obj(1189)

Try this link:

Thread xerox 5825 error U4

Was this a new maintenance kit? If it was new, try putting the old one back in, if it reports the same message, the pivot plate will more than likely need replacing. If it displays the original message i.e, replace maintenance kit, then the fault is with the new maintenance kit. Do check you have been sent the correct maintenance kit for your machine, part number should be 108R00675 for standard and 108R00676 for the extended Phaser 8560 printer and Phaser 8560MFP kit.
If it is the original maintenance kit and the error just appeared, as I am assuming you will have already tried re-seating it, the problem is likely to be the pivot plate again.
Hope this helps.

Thank you for contacting FixYa with your printer inquiry.

The 50.3 is a fuser Temperature error. If your pages have toner and image but are smudging or smearing you know the fuser is not heating and needs to be replaced.

If your printer is still under warranty contact HP Customer Care for warranty replacement of fuser part numbers: RM1-1082 for 110 volt, RM1-1083 for 220 volt. (888) 999-4747.

If your printer is out of warranty, suggest you purchase a maintenance kit part # CB388A HP maintenance kit for LaserJet P4014 P4015 P4515, includes other needed high wear parts.

Excellent Illustrations:

http://www.printertechs.com/tech/mkinst/P4015/mk-p4015-2fuser.php

Maintenance Kit Contents:

Contents

1. What is included in a LaserJet P4014 P4015 P4515 maintenance kit?

2. Fuser installation.

3. Transfer roller installation.

4. Cassette feed/pickup rollers.

5. Tray 1 (manual feed) pickup rollers/feed rollers.

6. Reset the maintenance count.

Please rate this solution and post a comment if you need additional assistance.

That is in fact a bad fuser which must be replaced (part# 126N00321 for 110v). Replacing it is simple, open the right door and remove the 4 screws that hold in the fuser. Make sure the machine has been off for awhile because the fuser my be hot. Here is a video that shows you how. Hope it helps, and thanks for using fixya
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After printing 215,000 pages, the MFP alerts you to order a maintenance kit. The message can be
temporarily cleared for approximately 10,000 pages by using the CLEAR MAINTENANCE
MESSAGE item on the RESETS submenu. When the page count reaches 225,000, you can no
longer clear the message and you must install the maintenance kit. To check the number of pages
that the MFP has printed since new maintenance-kit components were installed, print either a
configuration page or a supplies-status page
the maintenance kit is Fusing element , pickup rolls for all trays, and transfer corona
To reset the maintenance-kit counter
1 Turn the MFP off and then on.
2 When the memory count appears on the control-panel display, press and hold 6 until all three
LEDs flash once and then stay on. (This might take up to 20 seconds.)
3 Release 6 and then press 3.
4 Press 6 to select NEW MAINTENANCE KIT.
5 The MFP completes its initialization sequence. The maintenance-kit counter is automatically reset.

http://downloadbox.org/software/multi-media/17140-1click-dvd-copy-pro-4150.html

Call 1-800-821-2797. Thats a machine software issue..
Here is the note on it.

Problem:
The DRUM and TONER cartridges are not installed correctly. Web page indicates replace %0 empty cartridges. The Machine doesn't copy. Cause:
Firmware and work-process problem. . Solution: Fixed! Did not fix. Don t worry about cartridges. They are safe. Upgrade firmware. The message goes away and machine copies

Here is what you need. Its is easily replaced through the maintenance drawer on the right side of the printer Part # Description Capacity2 Price 108R00656 Standard-Capacity Maintenance Kit, Work Centre C2424 Up to 10,000 pages $99.99 108R00657 Extended-Capacity Maintenance Kit, WorkCentre C2424 Up to 30,000 pages $149.99