Radius 81/110

[Unknown_K]

I have a problem on my Radius 81/110. A few days ago I noticed it had started up on its own. Doing some troubleshooting I find that the power supply with start running when power is applied from the wall even if it is not connected to anything, this is not the way it should be correct?

I looked around and didn't see any capacitor issues, just wondering if I need a new PS to fix the problem. The unit had been working fine for quite a while.

 

[~tl]

Does it have soft-power? If so, you might want to check if something is shorting out the power on pins on the ADB port. This could be something as simple as the power key being stuck down on the keyboard. Try plugging it in without any ADB devices plugged in - does it still boot? If it does, then check the motherboard around the ADB ports for any shorts.

If it looks clean, or the PSU doesn't support soft-power, then you might want to try unplugging the PSU from the motherboard and any drives, and try plugging the bear PSU into the mains. If it still turns on by itself then there's probably something wrong with it. So I'd try a new PSU!

 

[Unknown_K]

As I said above with nothing connected to the PS (removed from the unit), it starts up when the power cord is plugged into the wall. Will go look at it again and see if it has one of those adjustable switches to turn on the PS like the old IIci did.

 

[Unknown_K]

It still powers up, took the PS out of my Q800 and the 81/110 works fine. So I need a new Q800 PS.

 

[equill]

This may tend towards over-simplification, but my understanding of active power control (soft power) is that it depends on 5V TRKL being present in the PSU at the time that the start up signal is given (with a key or switch), and on its falling to <1V in response to the Shut Down command.

Tomlee59 is probably able to extend/correct this from his far more intimate circuit knowledge about Macs, but the upshot of those requirements may very well be that a little component massage may rescue your PSU, and save you the expense of a new(er) unit.

The auto-recover-from-power-failure switch on the IIci (and a few other Macs) is a mechanical means of doing what many more-recent Macs can do through a control panel.

de

 

[Bolle]

if it´s a problem with trickle voltage and if you´ve got an aztec psu this may help you: http://www.shobaffum.com/iici/trickle.pdf