You are not logged in.

#1 2014-05-30 18:39:59

uniserver
Member
From: Sf, Mi
Registered: 2014-05-15
Posts: 956
Website

Macintosh IIfx problem solving.

IIfx.jpg
Ok so here is the story as i understand it.


Quadraman buys this IIfx from ebay.
Gets it... and its got battery devistation.

So i have a working IIfx board here...
I told em, hey man you can have this one for XX bucks... no problem.

Minus the Ram ( because he already has some )
Minus the Rom ( he already has one )

he said ok cool!

So I sent the board to him... he installs it. and connects everything
up.

Only to find out now when he presses the On button on the back and the keyboard. It will not power on.

So i showed him the video where you could jump start the PSU
as in this thread:
http://thinkclassic.org/viewtopic.php?id=69

and to make sure and check the voltages of the Pram Batteries,
(They were good here before i sent them but ya never know).


Anyways, i guess my question is this:

He said that he has no soldering iron and doesn't know how to solder..  and no multi meter...
to test his psu.

Does anyone have any nifty ideas on this situation?


#I Re-Cap √Mac √NeTX √Amiga Boards - A/B - PSU# (MacCaps.com)  Modern SCSI HD's - For Old Macs - Pre Cfg'd - 10k RPM! 73gb!! $50 + free shipping  -- Mac 128K Re-Ram kits (16 Chips) $35 + shipping, Floppy Issues?-> Bourns Filter Solution 128k - SE/30, $16 + shipping

Offline

#2 2014-05-30 18:57:42

bbraun
Member
Registered: 2014-05-29
Posts: 1,064
Website

Re: Macintosh IIfx problem solving.

Ok, here's my True Confession...  I hang my head in shame for admitting it, but whatever works right?
My IIx had the soft power problem for a year or two before I ended up fixing it.  Here's what I did before I fixed it:
I got myself 2 alligator test leads and a normally open, momentary push button switch from radio shack.  One clipped to the the PRAM battery terminal and the switch.  The other clipped to the PSU connector and the switch.
I then mounted the switch through the floppy drive slot on the front of the case.
Boom.  Ghetto power button on the front of the case with no permanent defacement.

Just be careful moving stuff around/bumping the case, since you don't really want those clips floating around and shorting random stuff inside the case.

I couldn't find a pic of the completed system, but here's one I took partway through the travesty:
annotated.jpg

Offline

#3 2014-05-30 21:33:53

uniserver
Member
From: Sf, Mi
Registered: 2014-05-15
Posts: 956
Website

Re: Macintosh IIfx problem solving.

gotta love alligator leads…  smile

360-150_HR_0.jpg


#I Re-Cap √Mac √NeTX √Amiga Boards - A/B - PSU# (MacCaps.com)  Modern SCSI HD's - For Old Macs - Pre Cfg'd - 10k RPM! 73gb!! $50 + free shipping  -- Mac 128K Re-Ram kits (16 Chips) $35 + shipping, Floppy Issues?-> Bourns Filter Solution 128k - SE/30, $16 + shipping

Offline

#4 2014-05-31 01:19:05

techknight
Member
Registered: 2014-05-22
Posts: 452

Re: Macintosh IIfx problem solving.

I am not fortunate enough to own a IIfx, but if I ever come across one(never), ill keep this in mind!

Offline

#5 2014-05-31 09:19:42

volvo242gt
Member
From: Duvall, WA
Registered: 2014-05-22
Posts: 410
Website

Re: Macintosh IIfx problem solving.

The other possibility is that maybe his PS went tits up around the same time the batteries went kaboom.  When I got mcdermd's old IIfx case with stuff from a machine he sourced from his buddy in Eugene, OR, I tried the Sony power supply that came with the computer with my known working board.  Deader than a doornail.  Dropped my Mac II Astec power supply into the "new" case, and *bong*, it boots up no problem, just like it did when everything was in the old II case.

-J


modern: Mac Pro 2.8GHz 8-core 6GB/500G/DVD-RW
Pre-Mac: ][+, //e
other: iPhone 6s 128GB Space Gray

Offline

#6 2014-06-01 07:16:46

mcdermd
Member
From: Corvallis, OR
Registered: 2014-05-12
Posts: 973
Website

Re: Macintosh IIfx problem solving.

Crazy. That was a tested power supply too. It goes to show that caps really are gremlins. They work until they don't.


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
See the restored heroes here.

Offline

#7 2014-06-01 07:22:13

volvo242gt
Member
From: Duvall, WA
Registered: 2014-05-22
Posts: 410
Website

Re: Macintosh IIfx problem solving.

^Yep.  Probably will hand it to James1095 (he hasn't made over here yet, IIRC) and let him monkey around with it.

-J


modern: Mac Pro 2.8GHz 8-core 6GB/500G/DVD-RW
Pre-Mac: ][+, //e
other: iPhone 6s 128GB Space Gray

Offline

Board footer

About ThinkClassic

ThinkClassic specialises in the maintenance, repair, restoration and modification of Vintage Apple and Macintosh computers. Ask questions and find answers about classic Apple desktops, laptops, accessories and peripherals.