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The fuser is the heating unit near the paper exit, and that error means the lamp is burned out, the overtemp sensor is out, or the thermistor in the fuser is bad. About all you can do is replace the fuser. www.precisionroller.com will have a new fuser for you.
HP recommended checks: 1. adequate 120 VAC power supply, 2. Remove Fuser Assembly, wait 5 minutes and then reseat. 3. Reset the printer to Factory Default settings (remember to copy down the IP address, mask and gateway numbers first).
While this may solve the problem, it is much more likely it's time to replace the fuser. Cost is approx $125 if you buy it online. Just do a Google search on HP 2840 fuser.
The problem is not the fuser, is the main motor, you have to change it
A main motor error occurred. X description: 0 = Motor error 1 = Motor startup error 2 = Motor rotation error
1. Turn the printer off, and then turn the printer on. 2. Check and reseat the fuser and toner cartridge to make sure they are not hindering gear movement in the drive train. 3. Check the main motor’s cable to ensure that it is seated properly. 4. If the error persists, replace the main motor.
A 50 Service error is a fuser error. Turn the printer off for 5 to 10 minutes, then turn it back on. If the error is still there, I think your going to need to make a service call you can try reseating the fuser, but be sure to let the fuser cool completely before touching it. Good Luck the HP Laserjet 4p is a great printer.