Dust Bin Switch Servicing
The problem here turned out to be some slight smudges visible on the switch contact area, presumably from the rubber button (not shown), as well as possibly insulating oil on the rubber from handling with fingers. Cleaning with alcohol (which dissolves oil, leaves no residue etc.) both rubber and board appears to have restored it as far as USB readout is concerned. Time will tell. The picture shows nice shiny contacts after cleaning. Note apparent gold plating. It should be durable, so the problem is contamination or wear on the rubber contact piece. This tech is used on TV remotes which get a lot of button presses. The rubber seems pretty tough.
When opening the case for this I do not unplug the wheels etc., just tape them down, and put the vacuum cover on to hold the fan in place.
For replacement of the switch board in a worst case, a small tact switch from Radio Shack is shown next to the switch board; the size is similar to the Neato switch contact area. The rubber plunger holding pins are on standard 1/10" perfboard spacing and the board is the same thickness. A round hole in a bit of perfboard filed out square would countersink the whole tact switch with the button just above the flat, with the rubber plunger used as a flexible stem for it. Longer stem switches are available, which can be cut down as needed, with just a round hole for the stem and the switch body underneath the flat. The 2.2K ohm resistor in line with the tact switch will reproduce properties of the original switch. Widen holes out for the rubber plunger feet. Even cardboard, with filler underneath, would suffice; or fill the whole cavity with epoxy paste. The original switch board and cable was seen listed on Ebay
for $30 -- and you still have to open the case.
Epoxy fill is shown around the case screw hole on the left. The thin receptacle broke after many openings, is a bit too thin. I think it broke from trying epoxy inside the cylinder without filling outside, to correct a thread stripping problem; pressure might have been created self-threading into it.
courtesy of the Institute for Neatological Studies