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Powermac 8100 ATX PSU wiring
- Thread starter Jon183
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MrGasS27
Well-known member
https://discussions.apple.com/thread/2171912
Here someone says that the 8100 wants only +5V, +5V TRKL, +12V and -12V so, yes, you can do it.
You'll not have the soft power, you'll have to power on/off the Mac with a rocker switch between the Green ATX cable (PS_ON) and a GND cable, there is a circuit to enable soft power, but honestly I never used it because I prefer the manual power, in a thread i submitted in this section a user posted the diagram of that circuit.
However, I have this diagram from Dan Calhoun, in the first pinout is clearly mentioned the PowerMac 8100, so I think you can use it, if you put a manual switch to power up the ATX you don't have to connect the /PFW point, simply left it not connected.
Here someone says that the 8100 wants only +5V, +5V TRKL, +12V and -12V so, yes, you can do it.
You'll not have the soft power, you'll have to power on/off the Mac with a rocker switch between the Green ATX cable (PS_ON) and a GND cable, there is a circuit to enable soft power, but honestly I never used it because I prefer the manual power, in a thread i submitted in this section a user posted the diagram of that circuit.
However, I have this diagram from Dan Calhoun, in the first pinout is clearly mentioned the PowerMac 8100, so I think you can use it, if you put a manual switch to power up the ATX you don't have to connect the /PFW point, simply left it not connected.
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Jon183
Well-known member
The MB has not been tested, I bought it dead. ATX PSU does work, was pulled from a working machine. I will double check the wiring.
MrGasS27
Well-known member
I'm thinking that your 8100 motherboard could be bad, check for cutted traces or corrosion or even recap it, has your motherboard surface electrolytics or SMD tantalum capacitors?
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Jon183
Well-known member
The original electrolytic caps are still on. There is no corrosion though, the areas around the caps look great, ill recap it tomorrow and give it a clean. Its a 8100/110.
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The 8100/110 should come with a Peltier equipped heat sink. The peltier is a solid state heat transfer device between the heat sink and the CPU which is powered by a plug on the logic board. Make sure you have the correct heat sink (equipped with peltier sandwich), make sure it is actually plugged into the logic board power connector (two pin, IIRC). Check under the heat sink/peltier and probably clean and replace the heat sink grease. At this age, it is probably powder. AFter you clean the CPU (isopropyl alcohol works well) check the body of the CPU for cracks. A large number of X100 machines are dead because of cracked CPUs.
Oh, do you have a ROM DIMM? The 8100 does not have ROM on-board. It needs a DIMM. That would be very simple.
Oh, do you have a ROM DIMM? The 8100 does not have ROM on-board. It needs a DIMM. That would be very simple.
Jon183
Well-known member
ROM DIMMs are in, the cooler is attached, ill check it for cracks soon and if its fine, ill replace the paste. Sadly I left the iron outside and it rained, ill dry it out properly and then do a recap if the CPU is fine.
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MrGasS27
Well-known member
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