Re: SGI Indy power supply: identify this diode?

2018-04-08 Thread Pete Turnbull via cctalk
On 26/03/2018 17:07, Pete Turnbull via cctalk wrote: Except it's not a zener, or at least not anything like those [ones Camiel and Bob suggested]. I took one out of another (working) supply, and I can tell it has a forward voltage of 0.2V, so it's presumably a Schottky diode of some sort. I

Re: SGI Indy power supply: identify this diode?

2018-03-26 Thread Camiel Vanderhoeven via cctalk
4B would be a 2.2V zener; 4A would be a 2.0V zener, so that’s odd indeed... Camiel On 3/24/18, 9:47 PM, "cctech on behalf of Pete Turnbull via cctech" wrote: After a recent power cut and a series of glitches as the power

Re: SGI Indy power supply: identify this diode?

2018-03-26 Thread Ethan via cctalk
If only! That question has been asked many times on SGI forums like nekochan, for the Sony PSU (like this one) and also the Nidec. No-one has ever claimed to have seen one, and the chances are Sony wouldn't ever have released them. Yea I was looking for the Nidec one for the Indigo, as mine

Re: SGI Indy power supply: identify this diode?

2018-03-26 Thread Pete Turnbull via cctalk
On 26/03/2018 17:39, et...@757.org wrote: I'm hoping I don't have to breadboard a 1kV supply and find a lot of multi-megohm resistors to try and estimate the breakdown voltage - and then guess at the forward current rating. Is it possible to get the schematics? If only! That question has

Re: SGI Indy power supply: identify this diode?

2018-03-26 Thread Ethan via cctalk
I'm hoping I don't have to breadboard a 1kV supply and find a lot of multi-megohm resistors to try and estimate the breakdown voltage - and then guess at the forward current rating. Is it possible to get the schematics? - Ethan -- : Ethan O'Toole

Re: SGI Indy power supply: identify this diode?

2018-03-26 Thread Pete Turnbull via cctalk
On 26/03/2018 16:08, Camiel Vanderhoeven wrote: 4B would be a 2.2V zener; 4A would be a 2.0V zener, so that’s odd indeed... That's the idea I had... Except it's not a zener, or at least not anything like those. I took one out of another (working) supply, and I can tell it has a forward

Re: SGI Indy power supply: identify this diode?

2018-03-24 Thread Bob Smith via cctalk
4BSOD-123F MM1Z2V2SemtechZener diode http://www.s-manuals.com/smd/4b On Sat, Mar 24, 2018 at 4:47 PM, Pete Turnbull via cctalk wrote: > After a recent power cut and a series of glitches as the power was > restored, one of my Indys suffered a PSU failure. It's a Sony

SGI Indy power supply: identify this diode?

2018-03-24 Thread Pete Turnbull via cctalk
After a recent power cut and a series of glitches as the power was restored, one of my Indys suffered a PSU failure. It's a Sony APS-81 171W unit, SGI P/N 060-0008-001. I've found half a dozen damaged parts, and I've identified a 150R 1W metal film resistor (R135), two trannies (Q105, a