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50.2 Fuser Error Warm-up Issue – HP Laserjet 4000, 4050, 4100

Kevin Gumpp

July 24, 2016

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50.2 Fuser Error Warm-up Issue – HP Laserjet 4000, 4050, 4100

By far, the 50.2 Fuser Error on the HP laserjet 4000, 4050, and 4100 come up on displays more than any other fuser error on this model. The error means the fuser has reached a warmup service error. Something just didn’t go as planned and the machine never reached its correct temperature needed to start the printing process. Several things can cause the 50.2 Fuser Error in the HP laserjet 4000, 4050, and 4100. Below, I will try to list the more common issues that cuase this error and walk you through removal of your old fuser and provide you with information on where to buy a new fuser if needed.
HP 4000/4050 Fuser Assembly RG5-2661-000
HP Fuser for LaserJet 4100

Troubleshooting The  HP Laserjet 4000, 4050, and 4100 50.2 Fuser Error

First thing to try in troubleshooting the HP Laserjet 4000, 4050, and 4100 50.2 fuser error message is just turning off and on the machine. I replaced one last week that was giving this error every few weeks for a few months before they finally got sick of it and called me out to replace it. Second, check and make sure the power cable is directly plugged into a wall socket. These machines draw a lot of power so they should never be plugged into a power strip with other devices, battery back up, and make sure there are no other large equipment or heater type products on the same circuit. Heater devices include: coffe makers, copiers, laser or solid ink printers, and space heaters. Also the 220v fuser fits in the machine but will not heat up properly giving poor print quality or 50.2 Fuser Error messages. Last thing to try is leaving the machine unplugged for 10 to 20 minutes and then plug back in and try again which is what HP recommends in the service manual and what any tech or service company would say if you were to call and ask for some advice.

Advanced Troubleshooting for the HP Laserjet 50.2 Fuser Error in a 4000, 4050, and 4100

1. If the message   persists, reseat the Fuser. If that does not work, replace the Fuser.
2. To check the Fuser, turn the printer off and remove the Fuser. Measure the resistance between the Fuser connectors J132-1 and J132-2.   If it is not within the range of 200k  Î© to 500kΩ, replace the Fuser.
3. If there is no continuity between the Fuser connectors J143F (neutral) and J142F (hot) with the Fuser removed, replace the Fuser.
4. If the problem is not related to the Fuser, replace the Engine Controller Board

Conclusion About the  HP Laserjet 4000, 4050, and 4100 50.2 Fuser Error Message

Yeah, that last  section was boring. The guy or girl  who read that and found it intresting hasn’t been laid for awhile.   I put that in there just in case your machine is having odd issues and actual replacement of the fuser didn’t solve your problem. I’ve probably worked on over a thousand of these models and only once did I have to replace a engine control board in a 4100 to fix a fuser error. So if you do have this error and following the few troubleshooting tips that I gave you above didn’t solve your problem,  I would replace the fuser in your HP laserjet 4000, 4050, and 4100 printer to solve your 50.2 fuser error in your machine.

HP Laserjet 4000, 4050, and  4100 Fuser Removal

Note: Unplug power and communication cables and allow at least 10 minutes for cool down before fuser removal.
1a. 4100 – Facing the rear of the printer, press the left side (formatter side) of the rear output bin and release the hinge from the slot.
1b. 4000 – Facing the rear of the printer, pinch the right side of the Rear Output Bin and release the hinge from the slot.
1c. 4000 –   remove the Left and Right Duplex Access Covers from the rear of the printer by pulling each from the bottom.
2. Rotate the output bin away from the printer until the right hinge pin is released, and then remove the output bin.
3a. 4000 and 4050 remove the two screws
3b. 4100 Rotate the two blue levers on the fuser assembly up to the unlocked position.
4. Pull the fuser straight back and out of the printer.

Hopefully, this article has helped you troubleshoot the 50.2 fuser error in your HP laserjet 4000, 4050, and 4100.
HP 4000/4050 Fuser Assembly RG5-2661-000
HP Fuser for LaserJet 4100

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