Yeah, I see the problem ...... the problem is, what to play first!
Mmmmmmmm...it's still not clear what the problem is![]()
Clean them up with IPA (http://en.wikipedia.org/wiki/Isopropyl_alcohol) you can buy that in any electronics shop, but make sure its something like 97% alcohol (not that cheap 70% stuff).
I usually cheat and use the "all-round-wipes" you can find in any store to clean up the motherboard if they look as dirty as yours. Then I go round with IPA. A soft toothbrush helps getting into the hard to reach areas. Do not scrub hard. Just a gentle pressure.
Take note of the capacitors on the motherboard. You already know about the battery. I would snip the battery out (either solder it out or just cut the leads). The SMD caps ( http://www.bikudo.com/photo_stock/369764.jpg ) should have two shiny solder points (after cleaning of course). If they look dull and do not reflect light, they have started to leak and will need replacement. You can still try starting it up though.
The through-hole caps usually are not a problem ( http://i.stack.imgur.com/tZYPs.jpg ) but make sure they are not bulging on top. Should be a flat head on them.
Your A3640 have 3 caps turned the wrong way so they most likely need to be replaced and turned the right way around. ( http://amiga.serveftp.net/A3640_capacitor.html )
The PSU in the A4000 usually works. Open it, blow it out and look at the caps. Anything bulging? No? Connect an old harddrive to it and fire it up. Measure the motherboard connector with a multimeter. Should have +5, +12, -12 and power good (measures as 5v I think?)
If all is good, power it up and see if you get the kickstart screen. Wait atleast 45 seconds before starting to swear. It takes longer to get a picture with no floppy or IDE connected.
Major battery damage on that one actually. Look at the pins in the socket next to the battery. All green. The light green area around the battery is all battery acid
Have you access to an air compressor? If so, then give the PCBs a blast of air first. If they were stored in a dry, non-greasy, non-smoking area, then that's all they should need to get them clean. Only start using liquids/alcohol if the dust/dirty is stuck to the PCBs.
Bryce.
Amiga 4000's!!
First is marked 4000/030. It is the most complete unit, with Alfa Data Oktagon 2008 (assuming this is a SCSI HDD / external interface), all RAM slots populated (not sure with what yet), and an A3640 (which seems to be an 040 processor!). It has the CDROM, FDD and power supply. Interestingly, battery shows almost no signs of leakage and is soldered to the board.
The second is marked 4000/040! It is very incomplete. No PSU, no CDROM, FDD looks battered. It has all the RAM slots populated. The CPU board is marked A3200/A3400 and sports an EC030. If you note the photo, the battery is encased in an old film roll, and soldered to the board via wires! Of course I had to check it out.....and yup, corrosion everywhere!