mreaganasked Jun 15, 2017 at 7:16pm
Howling Noise for LJ300-400 M351-451
When I print an envelope, there is a loud howling noise coming from the front of the printer.
This howling noise generally happens when printing an envelope. The cause is one of the toner cartridges. Something is rubbing as the drum or fuser or other roller is turning. You need to carefully spray a small amount of WD40 onto the exposed wheels on each end of the cartridge. One end has two wheels showing and the other end has just one wheel showing. You have to treat all 4 toner cartridges because it's hard to know which one is causing the noise.