Yep the c22 there, especially if you're installing a Tantalum , The silkscreen is incorrect, so plus is negative the negative is plus, for c22 only. Of course installing bipola…

Apparently C19 should be the cap for +5 volt (C22 for -5 volt) i have removed the capacitor but without schematics i won't be able to trace anything. Here are pictures:

Start out by figuring out which cap is for 5 volt, can you post a high-res image of your logic board? Also, I remember reading somewhere that Uniserver found a cap that was labeled…

This topic is marked as "HOT"! I think it's the first topic I started that is "HOT"! Edit: Actually all the topics I've started (save my latest one) are "HOT".

I don't know, Uniserver might be able to help.

I have been performing a recap on a LCIII, the board was pretty clean and capacitors were not completely shot, and most of all even if it was not tested before, the owner just advi…

The acetone+alcool combination seems to have produced some effect, but I'm not sure if this is to be interpreted as a positive progress or a bad sign. Apparently, the system now *…

well there is only 8 caps to change on there so it wouldn't be a ton. couple things to try first though. 1. double check your monitor is working, those are dying from bad caps no…

Finally had some time to look at this boy.  I tried Elfen's suggestion and scrubbed the board with alcool and a toothbrush, but it doesn't seem to have made any difference. I also …

Hmm. How much would you charge for a recap? Are you reasonably sure that the caps are the problem or could I have put it back together wrong? heheh

i don't think those traces are bad,  i think if you change those caps it might work again.

I posted this IIvi over on the trading post, but I figured I'd ask here about this specific problem. When it went away in storage about 10 years ago, the colours on the display we…

YES PLEASE!

Ok, so it sounds like my basic idea will work. Good enough for me. I'll try it on the 520 I don't care about just in case.

The Maxell 650MB CD-Rs came yesterday, as did the floppy drive and HDI-30 to DB-25 SCSI adapter. The PowerBook and the AC adapter are coming Monday (18 May 2015). I found the Clams…

Techknight I have a 2400c battery apart and still intact!!!! I prepped it for rebuild eventually.. It just has the top cover nicely removed with little damage.. I will take a few p…

I did dig this old thread up: https://68kmla.org/forums/index.php?/topic/7704-powerbook-520-power-pinouts/ Sadly all the pictures are gone, but it pretty much explains everything…

I havent tried it recently. I vaguely recall screwing around with a generic power supply on a 520 long long ago when mine died. Back when I was actively dicking around with these m…

the lighting is too dark, and the pictures are too blurry to make out anything useful, but its possible the PCB circuitry is similar/same to make heads and tails of my battery.  B…

Seriously, no one?

I remember that Applied Engineering Accelerator, Dr. Levinson  had it (along with many others), it was quite a card! I managed to get the RocketChip Manual off archive.org. The si…

Again... sorry it isn't for the 2400. You'll have to find a battery out someone willing to Crack one and take pics

External port traces run through the internal one first... except for one or two. I forget which.

My accelerated Apple IIe makes a higher pitched beep, though I believe Applied Engineering made documents available for writing software to be Accelerator Aware.  Ultima V, for exa…

that is funny your external port works.  but the internal one doesn't.    Techknight knows dead scsi traces oh so well.