Amiga 2500 Mouse PotY, PotX problem

[Prime]

I have an A2500, it seems to work fine except for the mouse movements. The mouse buttons work fine, but the X, Y axis don't work at all. I read on NewTek's site that it could be a fuse, but I don't see a fuse (Small green soldered one that looks like a resistor.) I checked with an ohm meter from pins 5 and 9 all the way to the paula, which seems like a straight shot with no resistance. The only thing inline that I see is a ferrite bead. I guess the next thing I can check to see is, if the mouse port is receiving 5+. I already tried to replace the Paula and the CIA's.
Any Ideas?

Thanks,
Joe

[Prime]

I still don't see the fuse, so here is a picture.
I am going to test for 5v.
If there is no 5v on pin 7, what then?




Joe

[Prime]

Actually, there is 5v to pin 7.
I could change to electrolytic caps, what are the caps
rated at?
There is no U74 that I can find anywhere on this mobo.

Figures, it couldn't be something simple!

Joe

[Prime]

How can you test caps and diodes when they are mounted on a mobo? Doesn't this give bogus results?

Joe

[Prime]

Yes- I have tried other mice...

I love this stuff, so any little gems you can throw my way, be my guest!

I will check it tonight when I get home from work.
I am excited, hopefully we can get this bad boy working.

Joe

[Prime]

Well this thread kind of went a weird direction, but a perfect segway for a couple of questions:

I have an A3000 I just got, the mobo is in pristine condition and the battery was just starting to leak. I removed the battery and directly under the negative side there is a small place where the green solder mask chipped away to reveal copper. (A very tiny bit.) Should I drop some RTV on there, tin it or leave it alone?
And what is the "preferred" method of making sure any acid crystals get off the mobo? I have been spraying the area with flux cleaner.

Thanks,