I have a HP LaserJet 5000 with a Fuser Error code 50.1, meaning low temp. I am not a tech, but I have been repairing my own cars, printing presses, computers, printers and anything else that breaks for over 35 years. The previous fuser on my LaserJet 5000 lasted over 7 years and while I was not getting any error codes, it was not fusing laser plates as well as I liked. Until recently I had two HP 5000 LaserJets and was able to trouble shoot by swapping parts. I replace a bad DC controller board in this particular printer about a year ago. Shortly after that I replaced the fuser with a genuine OEM HP fuser and it fused great for nearly a year. A few weeks ago I had a massive paper jam in the fuser and a day later got a Fuser Error 50.1. After checking the Internet I determined it might have broken the ceramic heating element. I swapped fuser with the one in my other identical working printer and the fuser error went away. I swapped the fusers back again and the error returned, pretty much proving the problem is in the fuser. Since I am not made of money I figured I could rebuild a fuser just as well as anyone else so I went on a search for the parts, but it was like calling Area 51 and asking what they were hiding. The service manual indicated some ohms testing to be done on the problem fuser and all results came back showing all the correct readings. I knew the fuser was the cause of the error, and the parts were not cheap so I carefully disassembled the fuser to see if I could isolate the exact part that was broken.The ceramic heating element and everything else looks fine. One detail I had found odd was that the printer used to take a couple of minutes or more to heat up, but I now got the fuser error 50.1 within 15 or 20 seconds of powering it on. This made me wonder if it would even have enough time to heat up enough to know it had a low temp problem.I thought the problem might be in the part that actually measured the temp. While I had the fuser apart I found one small resistor attached to the frame directly under the main drive gear. I did an ohms test on the resistor and it showed bad. I really hate to tear my good fuser apart to swap the resistors for fear I might burn it up to, so has anyone out there heard of a bad resistor causing a 50.1 error? I found only one reference on one site about a different LaserJet with a 50.1 code because of a bad resistor, and I have no idea where that resistor is on that particular printer. I know I could have just replaced the fuser by now, but I like to learn how things work and solve puzzles like this one. I am hoping some of my info may be of help to someone and if anyone has anyone ideas or thoughts on my comments, I would love to hear them. I will go on a search for a resistor next week and see if that helps. I hope to hear from someone soon. Thanks and God bless. James
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Turn the printer off and unplug it for 30 minutes; then turn the power back on.
Try a different power cord. DO NOT use extension cords to plug the printer in.
Remove the surge protector or UPS/CVT device and connect the printer directly to a power source.
Try a different electrical circuit. There could be an issue with the line voltage going into the printer from the power source.
Turn the printer off and unplug it. Let it sit for 30 minutes to let the fuser cool off. Carefully remove the fuser; IT MAY STILL BE HOT USE CAUTION. Examine the fuser, if any damage is apparent the fuser may need to be replaced. If no damage is noted reinstall the fuser, plug the printer back in and power it up.
Remove the printer from any UPS supplies, additional power supplies, or power strips.
Plug the printer into a wall outlet to check whether this resolves the problem.
If the printer is already plugged in, try another power source in the building independent of the one being used.
The line voltage and current source at
the printer location might need to be inspected to make sure that it
meets the printer's electrical specifications.
Turn the printer off then on.WARNING: Be careful when removing or reseating the fuser. Temperatures can reach 400+ degrees Fahrenheit.
If the message persists, turn the
printer off for 30 minutes to allow it to cool, then reseat the fuser
after checking the internal wiring connections on the right and left
side, ensuring that these connections are properly seated.
If the 50.1 or 50.2 error recurs after
power-cycling the printer or when trying to print, try installing a
known good fuser from another HP LaserJet 4100 series printer, if
If the fuser is near or at the end of its estimated life expectancy (approximately 200,000 pages), then replace the fuser.
After replacing the fuser, print a
Configuration page, a Menu map (shows fuser settings), an Event log, a
Supplies status page, and a Usage page, to reference the status of the
new fuser and to ensure that the previous fuser settings are in place
with the replacement fuser.
To print an Information page on the HP LaserJet 4100, perform the following steps
Press the MENU rocker key until INFORMATION MENU appears on the printer display.
Press the ITEM rocker key until PRINT CONFIGURATION (or until PRINT MENU MAP, etc, appears in the printer display.
Press the SELECT button to print the selected information page.
To print an information page on the HP LaserJet 4100MFP, perform the following steps
Press the MENU button.
Press the DOWN Navigation button until INFORMATION is highlighted.
Press the RIGHT Navigation button.
Press the DOWN Navigation button to highlight PRINT CONFIGURATION
(or PRINT MENU MAP, etc, appears in the printer display.
Press the SELECT button, the button with the checkmark on it to print the selected Information page.
If 50.x errors persist after properly
installing a known good fuser, or if the errors follow the questionable
fuser (provided it is not near the end of its estimated life
expectancy), contact HP for further assistance.
X FUSER ERROR
A fuser error has occurred.
1. Turn the printer off, wait 10 minutes, and then turn the printer on. 2. If the message persists, reseat the fuser. If that does not work, replace the fuser. To check the fuser, turn the printer off and remove the fuser. Measure the resistance between the fuser connectors. If it is not within the proper range, replace the fuser. If there is not continuity between the fuser connectors neutral and hot with the fuser removed, replace the fuser. If the problem is not related to the fuser, replace the engine controller board.
. Turn the printer off, wait 10 minutes, and then turn the printer on. 2. If the message persists, reseat the fuser. If that does not work, replace the fuser. To check the fuser, turn the printer off and remove the fuser. Measure the resistance between the fuser connectors. If it is not within the proper range, replace the fuser. If there is not continuity between the fuser connectors neutral and hot with the fuser removed, replace the fuser. If the problem is not related to the fuser, replace the engine controller board.