/sci/ - Science & Math

Willing, but not able. Sorry /op/

>>>/g/.

It's called technology for a reason.

>>3870322
I was afraid I'd get that answer.

>>3870326
No problem, thanks anyways.

it looks like it's just 1 capacitor fried.
replace it.

I'll take a chance and bump here anyways until /g/ decides to help.

>>3870334

You already tried /g/?

Try here: http://arstechnica.com/civis/viewforum.php?f=11&sid=11488b2e9f1462c9db81b01ca5ebfc23

>>3870334
You can probably get a replacement. You just need to find out what voltages that power supply supplied and what amperage it's rated at. I wouldn't doubt if you could splice a modern ATX power supply to the existing cables and get it to work.

blown capacitor, order another one online shouldn't be to expensive i assume you have the knowledge to get the right one, correct farods, voltage rating and then be super careful removing the blown one and solder in the new one.... if that proves to difficult, which it might be look to buy an entire new PSU, doesnt have to be the exact same model, just connectors and voltage rating

>>3870350
Will a novice like me be able to do that, or should I take it to some electronics shop?

>>3870356
Nope, I figured this might be /sci/ence related, so I posted here first (Thread is created over there now too though)

>>3870369
You were correct to make this thread here, if you ask me. /g/ is only for "what computer hardware do I buy" and "lol steve jobs is dead." Anything beyond I would leave to /sci/

>>3870375
Yeah, exactly.

> >>>/g/20459384

>>3870369
do it yourself. those computer places rip everyone off so badly, really not even worth it.

>>3870381
Okay then.
And what exactly am I looking for, something that looks just like that one part from 1982, or something entirely different?

>>3870391
See how it says ,47uF? you need a .47uF capacitor of the same voltage rating. If It doesn't say the voltage rating just get one that's in the hundreds of volts so there's no way it would ever exceed its ratings.

-if you can't solder, find a hobbyist to do if for you.
-if you could remove the circuit board and get the replacement capacitor, a tv repair shop wouldn't charge much if you showed up and said "I need this cap soldered in here".(no diagnosis or responsibility)
-a .47uF is common and can be got at radio shack.Get one with at least a 25 volt rating(higher would be better if the physical size allows it)

is that capacitor the only thing damaged?

>>3870411
It says
"250V~MP
fo = 1,9 MHz"
Does that help?

>>3870391
That looks like a paper capacitor and I don't know if they make them anymore.
An electrolytic cap will be fine but must be installed with the correct polarity.It looks like a small cylinder with wires coming out the end

Also, could I maybe present this piece of technology to a physics teacher at my school, and hope that he might be able to help me?

>>3870391
Find a capacitor with the same capacitance (0.47 microfarads) and at least as high voltage (can't see from pic, could be under it or to the sides, if not, you can probably find info about Apple IIe PSUs from enthusiast websites), and possibly the needed temperature range(ditto) and orientation(likewise).

When you know the values, you can probably find the needed part here:
http://www.farnell.com/

Then get a soldering iron and needle-nose pliers. Mark the ends of the capacitor on the other side, grab the lead of the capacitor from the picture side and apply a little pull, heat the bead from the other side until the lead comes free. Repeat with the other lead.

Check that the hole on the board is relatively free of solder, if not, heat it up and try to clear the hole.

Check the correct orientation of the new capacitor, push the leads through the holes in the board and solder them in place. Cut the extra leads off with cutters.

If you're unsure, practice soldering with a broken electronics board or something.

If there are other beads close to the ones you're about to solder, be extra careful that you don't make any shorts.

>>3870334
Don't listen to him, /g/ doesn't know shack shit about technology or electronics. You're much better off asking here.

>>3870446
A nice fellow at /g/ suggested something like this
>http://www.mouser.com/ProductDetail/Panasonic-Electronic-Components/ECW-F2474JAQ/?qs=sGAEpiMZZMs
h%25
2b1woXyUXj%252bszKWXG0n6rrQaMiSnKU%252b0%3d
Does that look related?

>electrolytic cap will be fine but

no no no

MP caps (metallized paper) are for AC use and are still available of course

>>3870446
disregard

if that is rated 250 volts, a polarized (electrolytic) will NOT work.

you might have to replace it with a ceramic cap if you can get one rated .47 uF (sorry my component knowledge is quite out of date)

>>3870456
Very useful info, thanks. And I can probably get someone I know or a teacher to find out what part I need and help with the soldering.

If you like to do it cheaply, get a trash PSU from a TV, (TV ist trash anyways) or rip a capacitor from a computer PSU.

Capacity dosn't matter since it's only a filter capacitor, so anything around 0,5uF and at least 250V voltage rating is OK. best take a capacitor which fits into the PCB.

And don't trash that old Mac, new Macs are trash, but a Mac II is a piece of history. I wish my parents would have kept our old family mac IIcx, harddisc died then and it was decided that the mac goes to trash.

>>3870505
There is no way that I would ever considering giving this up without trying first, and My dad wouldn't allow it either, so no, I'm not trashing it.

Anyways, I imagine a TV-PSU wouldn't have the same socket, how would I take care of that?

Some Apple II resources.
Could be related or not. Too tired to check:
ftp://ftp.apple.asimov.net/pub/apple_II/documentation/hardware/schematics/

http://forums.macrumors.com/showthread.php?t=1165609

http://stason.org/TULARC/pc/apple2/faq/17-010-What-are-some-good-Apple-II-power-supply-fix-tries.htm
l

http://www.applefritter.com/node/21207

http://www.vintage-computer.com/apple2e.shtml

http://www.a2-web.com/a2hrdware.html

Some of these sites haven't been updated in a while, so at least some links will be dead.

Good luck, you're on your own.

>>3870540
Any help is appreciated, thanks.

I'm gonna try and do one last push here.

Info (About OP pic):
Top says "0,47uF @ X"
South side says "250V~MP / fo = 1,9 MHz"
North side says something, but it's not readable due to cracking.

If nothing more comes of this, I thank you very much for your help.

>>3870620
.47uF - this is the capacitor value(micro farads)
250v - cap voltage rating
metallized paper - type

that's all you need

my guess is that that capacitor is just to filter out electrical noise.
if you cut it off, the computer will probably work fine, just more susceptible to "noise".
remove it and see if everything else works