HP Laserjet 4350 noise squeaking

[AISI]

Printer is making a loud squeaking noise, copy and print from tray 1 2 & 3 . I have two machines,replaced Toner cartridge,fuser unit,drum drive and main drive motors,and large gear assembly. Cleaned and lubricated exit unit,duplex unit,alignment roller unit,and paper feed unit.I appreciate your help !!!

[theengel]

Re: HP Laserjet 4350 noise squeaking

How loud is it? I often tell people, "I can either just shotgun parts, which is expensive, or wait for the noise to get loud enough to find... or wait until whatever is causing the noise to cause another problem (like an error or jam) as well.