Help with Power Designs 6050C  - Page 1
Forum section: electronics / testgear

author: Anson
author_rank: Regular Contributor
timestamp: June 10, 2013, 07:48:57 pm
content: 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.

author: robrenz
author_rank: Super Contributor
timestamp: June 10, 2013, 08:08:01 pm
content: You could ask for a quote fromhere.They list complete PD power supplies available. Probably crazy expensive also but worth a shot if you can't locate it elsewhere.

author: Anson
author_rank: Regular Contributor
timestamp: June 10, 2013, 09:41:46 pm
content: 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.

author: c4757p
author_rank: Super Contributor
timestamp: June 10, 2013, 09:55:40 pm
content: 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.

author: Anson
author_rank: Regular Contributor
timestamp: June 10, 2013, 10:13:36 pm
content: 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.

author: c4757p
author_rank: Super Contributor
timestamp: June 10, 2013, 10:16:16 pm
content: 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.

author: fmaimon
author_rank: Unknown
timestamp: June 10, 2013, 10:17:14 pm
content: This manualisn'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.

author: c4757p
author_rank: Super Contributor
timestamp: June 10, 2013, 10:23:25 pm
content: Ugh.Whymust all the PD schematics look likethat?? 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...

author: Anson
author_rank: Regular Contributor
timestamp: June 11, 2013, 03:16:24 am
content: Ok 1N4004 then. I have a few of those too.