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Most likely a bad pick up roller these machines will give a jam error if the paper or envelope is not picked up. Try cleaning the roll for the tray you are having the trouble with if the condition improves you have found the problem.
Hope this helps
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.
The error is a loss of laser beam detect error. Your problem is the laser scanner has burned out. The replacement is easy to accomplish. You simply have to remove the full top cover (3 screws and 1 clip near front right corner). You'll need to remove the side cover first. Once the covers are removed, look for a large black box (about 4" x 6") held in place by 4 screws. The part is available from Dale at Seattle Platen, 1-800-221-2388. Ask for a refurbished on exchange.