Roodhouse Tech Blog

Technology at Geneseo Community School District 228

Archive for the ‘Printer Repair’ Category

The HP LaserJet 4250 (4350) is a solid fast printer with a long lifespan and has a good price per print.   There has been an unfortunate trend with many new laser printers that add wireless and new air print or cloud print options, which are nice, but at the same time shortchanging the more important price per page and toner capacity.   The LaserJet 4250 can use a 42x cartridge with a yield of over 20,000 copies, this cartridge retails for 200$ on Amazon (not generic HP OEM) which if you quickly do the math works out to 1 cent per copy.  The printers are relatively easy to repair with a fuser that snaps in and out and rollers that do the same.  The printer debuted in 2002-2003 and all 5 in the district are still working well,  going on a +10 year lifespan.

I ran across a 4250 that had a horrible loud clicking whenever the user printed.  This machine still was able to print but the clicking was exremly and made you think the machine was about to break apart.  Looking inside the machine I found a grey dust all over one side of the machine after removing the fuser.  A closer look reveals that the black plastic gear that turns the fuser is made of a weaker plastic and all of the gears get ground off.  This means the gear is slipping when turning the fuser and snapping against what is left of this gear.  Good news is a quick google search and this gear was found for under 10 dollars along with a guide on how to remove.    Here is the guide provided with the gear on how to replace,  the instructions worked well except I ended up having to drill out the screw holding the gear axle and epoxy it back in place with the new gear.

Repair Guide LaserJet 4200-4250-4350 SwingPlate | FuserGear

New Fuser Gears (5-10$)



Bad Gear – Notice the ground plastic shaving from the old gear)


Location of screw that holds worn gear, I ended up drilling it out.


I ran across a problem in which a few computers running windows 7 would have their print spooler fail repeatedly.  This would obviously not allow anyone to print and could not be fixed by restarting the service nor changing the print spooler directly location. I am installing printers using Bonjour for Windows Services but this fix seems to work for printers added through Add New Printer Wizard as well.

To fix the problems in my cause.¬† Navigate to the folder c:/windows/system32/spool/printers/drivers РHere delete the entire contents of the directory.

Now delete your printer or go back to the bonjour add printer wizard and reinstall a printer.¬† It should now work Рit appears that a corrupted print driver is the most likely cause of this type of print spooler error and Рhaving Bonjour reinstall a newer driver with all older drivers cleared seems to be the fix.

You can also use this fix it tool from microsoft

Although it is probably a lot quicker to just delete the drivers as I mention up above and reinstall using Bonjour (or Add new Printer).  I would use the fixit tool as last resort.

Lately it seems that I have been replacing the fuser film on lots of HP printers, mainly LaserJet 4240’s, LaserJet 4200’s, and LaserJet 4100’s.¬¨‚Ć Of all the fuser I have replaced on different HP models two models stand out as having overly complicated procedures for fuser replacement, the Color LaserJet 2600(and 4600) and The LaserJet 1300.¬¨‚Ƭ¨‚Ć At Millikin Elementary school the lunch staff uses an older LaserJet 1300n which starting crinkling papers and smearing toner.¬¨‚Ć Looking inside the printer you could see that the fuser unit was breaking apart and needed to be replaced.


In the Picture above you can see that the fuser medium is breaking apart showing a strange orange foam that is underneath the fuser’s film.

I found a replacement fuser online for about 70$.

To replace this fuser requires a some time and effort as the machine must almost be completely disassembled in order to remove the fuser.  After 20 or so screws and disconnecting 10 wires and a couple of metal brackets I was finally able to remove the fuser.  For anyone attempting this repair make sure to hang onto the middle sized white plastic cog, the new replacement fusers will often come without this piece and you will need it from the old one.

You can see from the photo below that the machine requires a complete teardown to access and remove the fuser.


Replacing the film and fusers on different 4200 models is much easier and straightforward requiring minimal effort to remove the fuser (2 minutes).  The only catch with these models is to place close attention to the fuser units,  the LaserJet 4200 4240, 4250 and 4350 all use a fuser that looks identical and that can be fitted into each unit.  If you happen to stick the wrong fuser into a mismatched model like a 4240 fuser into a 4200 you will end up with Service Error 50.1 or 50.2 message.

One helpful hint is to look at the pin arrangement on the fuser and to look at the color of the fusers’s film.¬¨‚Ć The LaserJet 4200 only has 5 copper connectors and has a smaller grey colored film.¬¨‚Ć The Laserjet 4240 and 4250 has a brownish color film with 6 copper connectors.


If you look at this connector on the photo above you can see that this fuser unit belongs in a LaserJet 4200 as their are only 5 copper pins surrounding the connector,  the 4240, 4250 and 4350 all have six copper pins.

The LaserJet 2600n is one of the more affordable color LaserJet printers in HP’s lineup but with the price savings you lose some of the options you find on the higher end models.¬¨‚Ć The LaserJet 2600n comes with 32 megs of RAM but has no expansion slots to increase memory,¬¨‚Ć if you are using the machine in a high output lab environment you may find the printer is pretty slow processing print jobs.

This printer also seems to have a defect with its Fuser as I have had to replace the fuser unit twice in under 2 years. To replace the unit takes considerably more work than in older HP models such as the LaserJet 4100, 4200, or 4050.

To replace the Fuser must first remove the Right hand Side Panel (if looking at it’s front).

With the Side Panel Removed Take unhook the cable that connects the top control panel to the side.  Also remove all of the Toner cartridges.

Now Begin unscrewing and unsnapping the top panel off the printer, this can be kind of tricky as one of the plastic top panes can be tough to unsnap.

With the side panel and top panels removed you can now replace the fuser.  Make sure to remove the bottom screws that hold the fuser to the top pane, also remember to reconnect all of the wired connections to the fuser.  Make sure not to unscrew any of the screws that actually part of the fuser unit,  this can be kind of tricky as it is somewhat hard to see what screws actually connect to the control board.

here is a photo of the damaged fuser, notice the burnt image on the fuser medium.

The total process took me about 30-45 minutes to complete, and the printer works like new.¬¨‚Ć Overall the process is probably still cost effective since you can find fuser’s for this model under 90$.

July 2018
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