Hi Jeff, Thanks for showing me my next step (contact cleaner). If that doesn’t do the trick, I’ll use the approach you describe for getting the vintage pot off the board and pursue Brad’s clever fab.
george g. > On 08Nov2021, at 5:05 AM, Jeffrey Birt <[email protected]> wrote: > > The easiest way to pull these pots is to use a large soldering iron tip and a > big blob of solder to heat all 3-4 terminals at once. It is easy to pull out > when all leads are hot at once. They you can use solder braid or a solder > sucker to clean out the holes. > > Most often you can take the knob loose and drip some contact cleaner into the > pot and rotate it back and forth to revive it. This does not always work but > it does most of the time. > > Jeff Birt > > From: M100 <[email protected]> On Behalf Of George Goodman > Sent: Sunday, November 7, 2021 3:57 PM > To: [email protected] > Subject: Re: [M100] M100 display suddenly less visible > > FYI, it appears the pot is dead, dead, dead (well, it isn't potentiating, > just letting a rather small bit through). That pot is so small and so very > well soldered to the board that I don't think I can do anything about it. It > appears that this M100 will become my donor. > > My second system arrives this week. > > Thanks for all the help, folks! > > george g. > > --- > Please note that this email is coming from my new account. Change the contact > information you have for me to send emails to [email protected] > <mailto:[email protected]> > Thanks! > > > On Thu, Nov 4, 2021, at 12:19 PM, George Goodman wrote: >> Hi all, >> >> My M100 display seems to have taken a turn for the dim. See the images in >> this shared folder —> >> https://www.dropbox.com/sh/y1cpftct6dgqy2j/AAAEb3PmIC1b30qh7FV_WX4ea?dl=0 >> <https://www.dropbox.com/sh/y1cpftct6dgqy2j/AAAEb3PmIC1b30qh7FV_WX4ea?dl=0> >> >> I can’t point to anything that happened. I started an install of TS-DOS from >> my Backpack and, once the Initial Program Load began, stepped away from my >> desk to get a glass of water. When I returned a few minutes later I thought >> the M100 had flat out died. I removed the Backpack and tried turning the >> M111 on and off and even did a hard reset. No joy…I thought. >> >> I happened to sit down at my desk and catch a more extreme viewing angle of >> the display. That’s when I realized that there was just a display issue. I >> verified that I can start up Basic, make the system beep, open Text, etc. >> However, I haven’t found anything that will get the display back to good >> viewing from overhead. >> >> BTW, I did try the contrast dial and that didn’t have any impact. The images >> in that shared folder were taken with the contrast at its highest. >> >> Does anyone have suggestions for debugging and fixing this? >> >> Thanks, >> >> george g.
