There's Good news ... and bad news

[Holley]

Good news is today I got an A2000 free, thanks to a very nice chappy who advertised it on Amibench :-)

It's got KS 2, 1Mb ECS, 'HardFrame' SCSI card with 50Mb Quantum harddisk.  Also got a Philips Scart monitor, two mice, very nice (yellow, but hardly used) keyboard, a wierd A5 serial scanner, and a pile of disks including a fun Morph program.

(before you ask it's just a nice old A2000, not a mint boxed prestige flagship model with military grade CPU :-D)

Anyway, the bad news is that while trying to coax the 2nd floppy into action I caught a fraid power lead on the PSU case :-( A small spark ensued, and while it carried on working fine for the moment it didn't reboot (and hasn't since).

The power is perfect on 5 and 12 volts, and the ground is good.  The harddisk powers up fine and the floppy light comes on when I pop a disk in, also the video recieves a blank signal.

So, any suggestions as to what I've cooked?  I have a rough but working A500+ that I can raided for spare chips if need be ... help!

(I was just looking forward to bunging in a 1Gb harddisk and CDRom, and getting stuck in :-()

[Holley]

The 2nd floppy power plug was hanging on one ground wire without the plastic clip on the back, the other 3 wires were close to it, I'd just moved the ok power connector from one drive to t'other and tried moving the floppy cable a couple of times (it looks like the cable is duff and only works on the first un-twisted connector, and the 2nd floppy drive is broken as well).

Obviously none of this with the power on!

Anyway, I was trying different combinations and powering on in-between, on the last time I did it the broken power connector was flopped near the PSU and one wire touched it.

When I first openned the case I saw the wires and thought 'must get that insulated soon' ... d'oh! - should know better :-?

[Holley]

Ed - Nothing comes up, it's just a black (or very dark grey) signal.

Doobrey - Time for some trial and error then ... I'll get busy tommorow, starting with the CIA!

I've never been any good at remembering which bits of the chipset were connected to each other, so thanks for the tips :-)

[Holley]

That site also has the pinouts here.

I've checked 'em, they're all fine, even the tick :-) +/- 5v is at 5.15 (including the 5v user) and +/- 12v is at 11.95.  There's no fuses on the motherboard.

[Holley]

Yay progress :-)

Replaced the CIAs & Paula (no change), then Gary, and it now boots from the harddisk or to the regular purple / floppy screen if the SCSI card is removed.

Neither floppy works though :-( But I'm tired and it's time for bed ...

[Holley]

Well, had it working fine with an external floppy (no spare working internal one), but with it's guts all over the place.  Bolted it back together and now it only boots to white with no harddisk activity.

Aaargh!

Ho hum, time for more trial and error ... later ...

[Holley]

Not really a case of wanting to be an Amigan, just not wanting to waste a fixable Amiga - there's enough of these in landfill already!

Looks like Paula is no longer getting power, according to the Aminet A500/2000 troubleshooting FAQ this probably means a 1 Ohm resistor labelled R200 is burnt out.  Time to order some stuff from RS (might as well get some clock batteries while I'm at it!).