Classic not booting after a full recap. Missing battery?

[Daniël]

EDIT: Meh, went to mouser anyway. Extortionate shipping for a tiny box of caps (£12,00!) but I need new caps for my IIci anyway, so I may as well buy them all in one on go, plus a spare optoisolator to keep in a parts stash.

Mouser makes more sense in Europe if you buy in bulk. I tend to order when I have several machines worth of caps, as over $50 or so shipping is free. You do need to pay import duties, but Mouser offers DDP, where you pay the duties at checkout, which saves the extra fees that would otherwise be slapped on top of that. And then it's not too bad, really.

 

[karrots]

I should note my BOM export only works for the 603-0525 Analog board. Model number as printed on the board. The 063-0395 board is slightly different in the capacitor values and locations. Most work. I'll post that list shortly.

 

[benanderson89]

Ive already got the caps on mine (Rev B, 240v). You should also clearly mark what voltage your BOM is for, too, since there's technically four: A 120, A 240, B 120 and B 240.

 

[karrots]

Pretty sure for the board that BOM is for the only difference is minus 1x 220uf 250v cap (due to JP1 being in place for 220v) and swap the other 220uf 250v for a 400v version. At least based on comparing my list to recapamac.com.au's board. Similarly, Console5's list for the older boards it has similar variation except both 400v caps exist because JP1 is not under the second cap.

I'll add that to the title if I export it to a Google sheet.

One other thing to note not related to caps. The optoisolator is a 400mil (10.16mm) version. Finding sockets for this wide that don't require a quantity purchase is a little harder than the standard 7.62mm wide DIP-6. For US buyers Digikey seems to only carry one requiring 1000 min purchase. Mouser seems to have none.

 

[benanderson89]

I've just removed DP7 from my Analogue board and tested it completely out of circuit. It works fine! Then I found continuity between the two holes where DP7 used to be.

I have a dead short to ground somewhere! The Diode was a complete red herring.

I took a photo and marked off (in orange) any pad that triggered the continuity test to the ground pin on the IEC connector and/or the chassis. Every pin on the transformer makes me think it's shorting inside.

Any help? I'm loosing my mind looking at this.

 

[benanderson89]

Completely stumped. I removed the analogue board from the machine, disconnecting the yoke and anode cap (it wasn't connected to the motherboard with the previous test). The cathode end of where DP7 used to be no longer has continuity to ground. I haven't done anything except... remove the board from the case. The power pin on the Molex connector for the hard disk no longer has continuity to ground, too.

I also didn't realise that a good number of the pins I had marked as referenced to ground were supposed to be reference to ground. Sorry about that. :lol: Guess I panicked and just tested ALL THE THINGS.

So I don't know what I did but it seems to have fixed it. I'll reassemble, test continuity again, solder in the new diode and see where I get.

 

[benanderson89]

Made a new thread as I now have a new error! Yikes, this computer is proving to be a real pain!