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| IIx Power Supply on the Fritz? |
Posted by: ajacocks on 2011-06-10 13:23:56
I have a IIx that I have been restoring to working order, and it's mostly working well. I've got it currently configured, as follows:
8mb RAM
9gb UW SCSI Seagate Barracuda
Radius PrecisionColor Pro 24X
FWB JackHammer
Radius Rocket 33 w/8mb
ProAudio Spectrum Mac
I'm pretty happy to have all of this, but my power supply is starting to show signs of it's age, I think. The IIx now only stays on while the power key, on the keyboard, is held down. I've heard it mentioned that this may indicate a bad power supply, but I'm not sure. Both of my PRAM batteries show 3.6v, so I don't think it's them.
Any thoughts?
Thanks!
- Alex
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Posted by: techknight on 2011-06-11 19:43:27
grab a multimeter and watch the rail voltages. do they sag beyond tolerance? if so then i would say the power supply may be at fault.
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Posted by: patatas on 2011-06-13 00:13:08
I tried two different power supplies but with not luck.
Eventually had to swap out the capacitors to get it to stay on !
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Posted by: Byrd on 2011-06-13 01:43:52
Hi patatas,
what capacitors did you replace - was that in the power supply or on the motherboard? Have a similar issue with my IIfx - only powers on with the power key held down.
Thanks
JB
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Posted by: TylerEss on 2011-06-13 16:12:02
I seem to recall that the two soldered-on PRAM batteries on the 6-slot II-series Macs will cause this behavior when they're flat.
Am I right that they are what you replaced patatas?
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Posted by: 24bit on 2011-10-08 15:58:24
I had a similar issue with my MacII about ten years ago. Soldered in two new batteries, but that did not help.
I located the problem in so far, as the trickle voltage from the batteries did not reach the psu.
Starting the psu with a seperate battery did work, but I gave up there. :-(
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