Help with Power Designs 6050C

[Anson]

I have a Power Designs 6050C that has some issues. I found a few shorts and am in the process of acquiring needed parts. I have found everything on my list except two dead diodes. The manual lists them a GI44Y but I cannot find a datasheet on them or a place to get them. I suspect they are a Power Designs part number and not an actual diode part number. I can see that they were once labeled GI44. The schematic shows only a standard diode symbol but this wouldn't tell me if its a switching diode or anything.

[robrenz]

You could ask for a quote from here. They list complete PD power supplies available .  Probably crazy expensive also but worth a shot if you can't locate it elsewhere.

[Anson]

They don't seem to have the correct one. I know this has to be a diode I could get from digikey or mouser I just don't know which one would be an exceptable replacement.

[c4757p]

Yeah, it's a PD part number. Seems to be the number they use for just a plain old switching diode, about the same as a 1N4148. Try that. I promise it's not a Zener, at least - they use VR instead of CR as the reference designator for those.

Obviously it's a bit bigger, so it'll have a higher power rating, but they do use them in low power signal applications. Use your best judgment as to whether you need to go for something bigger - in that case a 1N4004 should suffice.

[Anson]

I was hoping a 1N4148 would work. I have a few of those on hand. Once I get my caps in I'll solder everything up and try those. Hope it works. Thanks.

[c4757p]

I've seen that part number all over their schematics, and all I've ever seen it used for is switching, signal steering and voltage-drop references. Occasionally the current through it, when used for its voltage drop, is a bit high, so if that's its application you might consider a 4004 instead. Obviously the slow switching speed doesn't matter a rat's ass if it's used for voltage drop.

[fmaimon]

This manual isn't for the 6050C. It is for the 6050D, but also lists CR16 as a GI44Y (page 49), but if you look on the schematic (page 55), it says 1N4004 under CR16.

[c4757p]

Ugh. Why must all the PD schematics look like that?? Were they that bad in the original manuals, or does nobody who has access to the original manuals know how to use a scanner?

Not to mention what a nasty pile of wire spaghetti they all are... Shame the power supplies are always so well designed and the schematics look like they were arranged by EE freshmen... 

Yeah, looks like a 1N4004 will do. I wouldn't use a 4148 - looks like that might potentially (NPI) be in some higher-current paths, though I'm having a tough time tracing out all the damn lines on that schematic on my computer screen...

[Anson]

Ok 1N4004 then. I have a few of those too.