What are R177 and R176 for?

[Roger_S]

I seem to have some kind of defect on my other a4000 mainboard. I have 2 small crisped chips close to the keyboard connector. They are marked R177 and R176, the writing on them is 200. The miggy is working as it should and I think it has something to do with the external floppy drive.

When I replace these 200's with new once, the solder immediatley starts to melt when power is turned on, so I think there is some other defect as well.
I'm searching the schematics for clues but I can't find them.

does anyone have any idea?

[Roger_S]

And the answer is: 0 from all legs

btw i measure 12v between the resitors with the 200 print.

[Roger_S]

without the 7905 it also melts the solder. so there must be a shortcut somewhere. I have already replaced all caps on the mainboard, so that can't be it.

[Roger_S]

I checked again with another mobo and found that there is a track underneath r177 that is missing on the board, it burned away.

I going to send the board to an amiga repair center, see if they can fix it before i make a mess of it.

Thanks for the help!