I posted yesterday but my message seems to have vanished when the system came back up, so will see if anyone out there has some information for me on this problem.
Some time ago, I posted about some unusual behavior I was seeing in a 400 Roomba. The behavior was that it was a perfectly functioning robot that I changed speaker in to find that it no longer worked no matter what I did. I put a brand new cover on it at the same time and it was ready to go. After this change, I was no longer able to get this robot to go into diagnostics, or to start. When I would click on the CLEAN button, it would show two small green lights, one in the center and one to the right. I questioned at the time whether I had gotten it stuck in diagnostics, but that was not the case. The other strange thing was that it made a one BEEP sound, when I pushed the CLEAN button, not an ehhh, even though the bumper was not on, which was unusual as you know. Okay, so I never was able to fix that Burgundy, robot. There were suggestions at that time that I followed, but nothing brought this wretched thing back into functioning status.
A month or so later, I had an identical problem, same model, all I did was change the burgundy cover. What the heck? Another robot that was functioning perfectly, ruined?
So yesterday, I had another 400 which worked perfectly but it was white and I hated the white color so I decided as long as I had these two burgundy robots that I couldn't repair, I would switch out the covers so I would have a burgundy robot as opposed to a white one. Well, as you probably have guessed, the same thing happened, so I thought Bummer but good because now I know it is the cover, but when I replaced the white cover, I found that now the white one, still displayed the identical behavior, restoring it with it's own cover, wasn't going to help.
I was able to get a hold of Vic yesterday (thank God as I was pulling my hair out) and I asked him if he thought the NEW burgunday cover was "ruining" my PCB and he concluded that that was probably right. He suggested I take a close look at the wiring in the shell which I have since done but I can't see any problems (even when using a magnifying glass). I still beleive the problem is there however.
So, does anyone have any further comments or advise and is anyone able to explain how this might have happened and if there is any likelihood at all, the the PCB (now there are 3
of them) have any hope of being restored.