Accessing CIA chips in Amiga 3000 and 2500?

[Oldsmobile_Mike]

Welcome! Two totally different beasts. In the 2500, remove the cover, the drive sled (with PSU), done. In the 3000, make sure you have some finger bandages ready, and good luck.

Why do you need to access the CIA chips?

[Oldsmobile_Mike]

Definitely! Better late than never. If you haven't already, I'd check those batteries in the 2500 and 3000 ASAP!  Also try reseating all the socketed chips, cleaning off any corrosion, etc.

[Oldsmobile_Mike]

Had to pull up a pic because I couldn't remember either. Appears the A3000 CIA's are socketed, all the way in the back, below the PSU and drive sled & whatnot. Swap them with the ones in the other systems, if the problem changes then you know you've found your culprit.

Pic:

http://www.bigbookofamigahardware.com/bboah/media/download_photos/a3000rev61mb_1_big.jpg

But batteries first!