Mac OS 9 Lives

Mac OS 9 Discussion => Hardware => Topic started by: ettore on August 21, 2015, 02:48:37 AM

Title: atx power supply
Post by: ettore on August 21, 2015, 02:48:37 AM

Hi,
Which is the best tutorial For power supply replacement For my mdd dual 1.25?
I want to buy this one:
http://www.drako.it/drako_catalog/product_info.php?products_id=11284

Title: Re: atx power supply
Post by: MacTron on August 21, 2015, 08:21:45 AM

This doesn't work on MDDs as is.
You have to make some mods...
and forget about 28 v. pin.

Title: Re: atx power supply
Post by: ettore on August 21, 2015, 08:25:48 AM

i know that it cant work as is,i find a lot of video on youtube...but i dont know which one i have to follow.

Title: Re: atx power supply
Post by: MacTron on August 21, 2015, 08:29:02 AM

Quote from: ettore on August 21, 2015, 08:25:48 AM

i know that it cant work as is,i find a lot of video on youtube...but i dont know which one i have to follow.

You'll find some info here:
http://macos9lives.com/smforum/index.php?topic=1879.0

and here:
http://www.jcsenterprises.com/Japamacs_Page/Blog/EA215F16-F592-4CF7-AA8A-496D5323F6BC.html

Title: Re: atx power supply
Post by: supernova777 on August 21, 2015, 01:05:36 PM

mactron that url is for a sawtooth psu adapter.. that is not relevant for an mdd..

eTtore:
if your mac has a busted power supply.. do yourself a favor - dont try to replace it.
just get another mac that has an ok power supply.
its too much effort. when u can buy anohter mac cheap.

Title: Re: atx power supply
Post by: MacTron on August 21, 2015, 02:07:12 PM

Quote from: chrisNova777 on August 21, 2015, 01:05:36 PM

mactron that url is for a sawtooth psu adapter.. that is not relevant for an mdd..

eTtore:
if your mac has a busted power supply.. do yourself a favor - dont try to replace it.
just get another mac that has an ok power supply.
its too much effort. when u can buy anohter mac cheap.

OK, but we only have to rewire a few more wires ...

(http://www.smps.us/powermac_pinout.png)

The problem is the 28v pin and how to fit an ATX PSU inside a MDD case.

Title: Re: atx power supply
Post by: supernova777 on August 21, 2015, 02:25:54 PM

there is no other PSU that will provide this 28v power
other then buying another MDD powersupply
which is more expensive then finding another whole mdd!!!

Title: Re: atx power supply
Post by: ettore on August 21, 2015, 02:39:37 PM

I have read somewhere that the 25v pin is for the adc monitor;so if you haven't you dont need to connect 25v pin.its correct?

Title: Re: atx power supply
Post by: supernova777 on August 21, 2015, 02:51:47 PM

if your mac isnt dead.. then why are u worried about replacing the power supply

Title: Re: atx power supply
Post by: ettore on August 21, 2015, 02:53:37 PM

i want to change it for the noise.

Title: Re: atx power supply
Post by: supernova777 on August 21, 2015, 03:13:50 PM

Quote from: ettore on August 21, 2015, 02:53:37 PM

i want to change it for the noise.

u can replace the fans inside the powersupply which is easier + will fix the noise problem
there are many threads on this forum about how to do just that