Andrew_P

asked May 7, 2006 at 8:47pm
Hp HP LaserJet 5SI

HP 5Si Tray 1 Misfeed Fix

After searching this forum for a solution to HP LaserJet 5Si Tray 1 (manual bypass tray) misfeeds and not finding a relevant answer, I went out on a limb and found my own solution. I'd like to share it with other LaserJet 5Si owners and techs who may encounter this problem in the field and can't afford to replace an expensive assembly, or can't wait to obtain the replacement assembly.

A couple of months ago I purchased a used LaserJet 5Si with a page count of 83K+, built in late 1995. Just last week Tray 1 started acting up. The paper pickup roller would spin, but the metal registration tray didn't lift the paper stack to meet it, resulting in a 13.2 error. I found instructions on how to remove and replace the Tray 1 Assembly on another web site, but when I learned what a new assembly would cost, I was a bit taken aback -- it would be nearly as much as I paid for the printer. On closer examination, I discovered that after ten years the petroleum-based lubricant on the gears and optical sensor arm pivot had hardened into something akin to shellac, but could find nothing else obviously broken or worn out. Taking a chance, I removed the solenoid and gear cluster subassembly, removed the nylon gears and cleaned each for about five minutes in an ultrasonic bath with a solution of Simple Green and Fast Orange cleansers, followed by vigorous scrubbing with a stiff nylon brush and a tapered wooden stick. On reassembly, I lubricated the sliding surfaces on the nylon parts with G.E. G661 silicone compound (silicone grease), but avoided putting lubricant on the gear teeth. Problem fixed. The registration tray now lifts the paper stack as it was designed to do.