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HP Laserjet 8000DN

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by grandhighdruid 1 view

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I keep getting either a 50.1, 50.3 error, or every once in a great while I'll get a couple of pages that don't fuse at all, but continue printing after those pages with no problems. I have replaced the fuser three times, the DC controller, the low voltage power supply, all to no avail. PLEASE don't sent me any pat answers, as I guarantee they will be turned down out of hand. I have used the service manual and what little HP's website has to say about troubleshooting this problem. Thanks for your help.

12 replies

by ann777

The HP book says that a 50.1 error is a "Fuser Low Temperature failure" and a 50.3 is a "Over Temperature failure"

The power is low or unstable (for example, in a brownout).

Recommended actions:
1) Turn the printer off for 20 minutes and then turn it back on.

2) Verify that the fuser is installed correctly and fully seated.

3) Reseat or REPLACE the FUSER CABLE ASSEMBLY.

4) Locate and verify a stable source of power.

(capitalization in #3 is mine)

by grandhighdruid

I did forget to mention that I have already replaced the fuser cables. If you look at the website of the second response, it will tell you that this will not fix that problem. Also, I believe that I mentioned that I have used the service manual already. Thanks anyway.

by mskiproductions

The most common reason for this error is a fualty HIgh Voltage Power Supply. This supplies power to the fuser unit and if becoming unstable gives you a 50.x error message. Unless you are HP Certified, this is not a job you will be able to do yourself. If your printer is still in warranty, contact HP and they will send out an engineer to fix it at no cost. If out of warranty, you will have to put your hand in your pocket and pay for it yourself. Unfortunately, im not at work at the moment, so i cant give you an estimate of how much it will cost you.

Hope this helps.

Matthew Shine.

Computacenter, Europe.

by grandhighdruid

Believe it or not, I found that the problem was twofold:I had a corrupt ROM chip causing the power save problem, and found that I had to replace both the DC controller AND the low voltage power supply and the same time. Thanks for your advice, though. That goes for everyone below this answer, too.

by wanabedrsean

The high voltage power supply provide bias and charging voltages to the transfer roller and drum charging corona it is used in the image development and transfer processes. not the fuser the fuser is controled by the low voltage power supply i read your problem and need to ask if by any chance the fuser roller spacer jigs were removed and if this happened after a maintenance kit. also is it possible that the fuser that was replaced was a diferent voltage than the original like the 200 volt version of the fuser that would explain the tempreture problems and fusing issues.also are the blue envelope tabs on the fuser down.

by wanabedrsean

sorry for the double post I was really tierd.
I also forgot to ask if the lj is in a spot that meets all of hp's space and clearance requirements. my thought might be air flow circulation for the fans in the unit have you disable the power saving features also

just some more stuff to try

by wanabedrsean

The high voltage power supply provide bias and charging voltages to the transfer roller and drum charging corona it is used in the image development and transfer processes. not the fuser the fuser is controled by the low voltage power supply i read your problem and need to ask if by any chance the fuser roller spacer jigs were removed and if this happened after a maintenance kit. also is it possible that the fuser that was replaced was a diferent voltage than the original like the 200 volt version of the fuser that would explain the tempreture problems and fusing issues.also are the blue envelope tabs on the fuser down. this is a verry interesting problem.

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