Hm, today while testing the FigTroniX option rom module finally, I discovered that the screen on this unit works perfectly now.
It does not flicker randomly light and dark like it used to before I hit the pot with deoxit, and it is full normal darkness. Which is to say, it goes the same range from too light to too dark as my other 2 units, and it's smooth and stable. So I guess the DeexIT D5 just takes many days, over a week, to completely dry out of the inside of the pot. But the end result is it worked. The screen, and the contrast control, is great now. On May 17, 2016 3:31 PM, "Brian White" <[email protected]> wrote: > Thank you much. Something both easy and harmless to check. > > On Tue, May 17, 2016 at 3:09 PM, Gary Hammond <[email protected]> > wrote: > >> There is a -5v test point not far from the pot. When one of mine was >> doing this, I found that the -5v rail would jump around when the screen was >> playing up. The -5v is voltage divided by the pot so if it is low to start >> with, the pot just makes it worse. For me, it eventually turned out to be >> one or both of the diodes between the transformer and the -5v test point. >> I’ve replaced the diodes and haven’t seen any issues since, however that >> could also just be coincidence! YMMV >> >> >> >> >> >> Next, I have a m100 with a very faint screen. >> >> >> >> Originally the screen flickered bright dark randomly like as if the >> contrast pot was bad. >> >> So I shot the contrast pot with DeoxIT D5, and the the screen went almost >> out. >> >> >> >> It's not dead, just extremely faint. You can only see any contrast at an >> extreme shallow angle. >> >> >> >> This was a few days ago. It got a little better after a day, but then >> doesn't seem to be getting any further better since then. >> >> >> >> Is there a test point I can check or something to correct a voltage level? >> >> >> >> Should I wash that pot with some other product? I know there is a version >> of deoxit that says it's for faders, maybe that? Or Alcohol to dry it all >> out? (but then what do I put back in since you don't want to operate it dry >> very much?) >> >> -- >> >> bkw >> > >
