Macintosh 512+ Oddities... Any ideas? — #7

Post #7 by iMac600

Source Forum	68kMLA
Category	Troubleshooting
Post Date	Wed, 2 Sep 2009 - 08:22
Original URL	https://68kmla.org/bb/threads/macintosh-512-oddities-any-ideas.18431/

Post

Unfortunately the only reason I opened the case was to install a fan... and in the process of hooking up that fan I blew the fan and the fuses in quite a spectacular way.

Click to expand...

Um, how did you plan to adjust the voltages if not by opening the case?

So, did you manage to install the fan? Or will you be seeking a replacement for round 2? What guide did you use to install the fan? Or did you just "wing" it yourself?

Did you test your +12-V supply to make sure it was optimal before adding the additional load? The fan specs should be approx. 0.9 W @ +12 V DC (+/-15%)/120mA. You splice it into the J4 connector. Red to yellow (pin 10), black to violet (pin 7).

If I wasn't going to install that fan, then i'd never have opened the case, and i'd never have adjusted the voltages. Simple.

The fan was destroyed. Totally charred and melted. I used a guide in the fiftieth edition of the Mac 512 User Group newsletter to attempt the installation and connected it accordingly. It's possible the colour coded wires on the fan were incorrect (in which case, what a rip).

I somehow doubt i'll attempt the installation again. I'm fine with the machine now.