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Transistors
Hi Folks
Having some trouble finding some transistors. I am repairing a switch mode power supply and have a number of transistors that need replacing. The issue is I can't seem to find them online....maybe my google fu is out of whack or I have forgotten something obvious. Any way there are 3 different types of transistors first is marked as follows 2001 -2J Second 2005 -2I third P4M 25 if anyone can help me out or point me in the right direction that would be greatly appreciated. Regards Richard |
Transistors
Richard,
It would be helpful to know the make and model of the power supply (or the device it is part of), and the physical package of the transistors. If you know the schematic reference (ie Q25) that would be good too. Regards, Tim On 7/13/2019 6:53 AM, wrote: Hi Folks Having some trouble finding some transistors. I am repairing a switch mode power supply and have a number of transistors that need replacing. The issue is I can't seem to find them online....maybe my google fu is out of whack or I have forgotten something obvious. Any way there are 3 different types of transistors first is marked as follows 2001 -2J Second 2005 -2I third P4M 25 if anyone can help me out or point me in the right direction that would be greatly appreciated. Regards Richard |
Transistors
Richard,
It would be helpful to know the make and model of the power supply (or the device it is part of), and the physical package of the transistors. If you know the schematic reference (ie Q25) that would be good too. Regards, Tim On 7/13/2019 6:53 AM, wrote: Hi Folks Having some trouble finding some transistors. I am repairing a switch mode power supply and have a number of transistors that need replacing. The issue is I can't seem to find them online....maybe my google fu is out of whack or I have forgotten something obvious. Any way there are 3 different types of transistors first is marked as follows 2001 -2J Second 2005 -2I third P4M 25 if anyone can help me out or point me in the right direction that would be greatly appreciated. Regards Richard |
Transistors
Hi Tim
So it is a power supply out of a Sun Microsystems SPARC Classic computer. the PowerSupply is marked as follows on the outside Sun P/N 300-1101-01 Rev A Model: PEX643-30 Made by FDK Fuji Electrochemcical Co Ltd The circuit board is marked with the following PCB1750 A06-119271D Not easy or not marked as to the parts the transistors in questions are TO-92 and are all on the low voltage side of the switcher. hope that provides more detail. Cheers Richard On Saturday, July 13, 2019 at 9:26:55 PM UTC+10, Tim Schwartz wrote: Richard, It would be helpful to know the make and model of the power supply (or the device it is part of), and the physical package of the transistors. If you know the schematic reference (ie Q25) that would be good too. Regards, Tim On 7/13/2019 6:53 AM, wrote: Hi Folks Having some trouble finding some transistors. I am repairing a switch mode power supply and have a number of transistors that need replacing. The issue is I can't seem to find them online....maybe my google fu is out of whack or I have forgotten something obvious. Any way there are 3 different types of transistors first is marked as follows 2001 -2J Second 2005 -2I third P4M 25 if anyone can help me out or point me in the right direction that would be greatly appreciated. Regards Richard |
Transistors
On Saturday, July 13, 2019 at 4:48:23 AM UTC-7, wrote:
Hi Tim So it is a power supply out of a Sun Microsystems SPARC Classic computer. Good info; the date might be 2000 or earlier, so there's a good chance old-line part-number xrefs will help the PowerSupply is marked as follows on the outside Sun P/N 300-1101-01 Rev A Model: PEX643-30 Made by FDK Fuji Electrochemcical Co Ltd Lots of Japanese transistors have different pinout from US types; for TO-92, US normal is (facing flat, with wires DOWN, left to right) E-B-C Japan normal is E-C-B You can usually distinguish the two by a multimeter's diode-check function (assuming a working transistor) without desoldering. The circuit board is marked with the following PCB1750 A06-119271D Not easy or not marked as to the parts the transistors in questions are TO-92 and are all on the low voltage side of the switcher. If it helps, NTE crossreferences for (P4M) include NTE159, a general-purpose PNP (see https://www.nteinc.com and use the crossreference search) It is usual for one TO-92 item on the low voltage side to be a TL431 voltage reference... |
Transistors
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Transistors
Take some detailed pictures of the board top and bottom. If I can figure out how it is designed I can figure out a replacement fairly fast.
Either upload them somewhere or just send them to me. Hosting is nice, I used to have hosting until Dropbox stuck it up my ass and I don't want them at all anyway because they won't do what I want done. This year I am just going to dig in the old pocket and pay for some decent hosting. Are you in any forums that accept pictures in posts ? If so I can tell you how to hotlink. Now I need high definition well lit pictures, this is reverse engineering. It's not much fun anymore actually. |
Transistors
I have found this site quite useful on several occasions finding equivalents for vintage transistors:
https://alltransistors.com/crsearch....fe=20&caps=TO3 Mostly, "better" devices are available these days as drop-in replacements for whatever it was from those days. Peter Wieck Melrose Park, PA |
Transistors
On Saturday, 13 July 2019 11:53:53 UTC+1, wrote:
Hi Folks Having some trouble finding some transistors. I am repairing a switch mode power supply and have a number of transistors that need replacing. The issue is I can't seem to find them online....maybe my google fu is out of whack or I have forgotten something obvious. Any way there are 3 different types of transistors first is marked as follows 2001 -2J Second 2005 -2I third P4M 25 if anyone can help me out or point me in the right direction that would be greatly appreciated. Regards Richard If you can't find equivalents, work out what specs are needed from the circuit diag & get something that'll do that. People often get too hung up on equivalents imho. NT |
Transistors
On Saturday, July 13, 2019 at 12:53:53 PM UTC+2, wrote:
Hi Folks Having some trouble finding some transistors. I am repairing a switch mode power supply and have a number of transistors that need replacing. The issue is I can't seem to find them online....maybe my google fu is out of whack or I have forgotten something obvious. Any way there are 3 different types of transistors first is marked as follows 2001 -2J Second 2005 -2I third P4M 25 if anyone can help me out or point me in the right direction that would be greatly appreciated. Hi, you might want to post a question on vcfed's forum: http://www.vcfed.org/forum/forumdisp...x-Workstations Someone there could have a (even partial) schematic of that PSU and help you getting the right replacements. The closest SUN workstation that I have at home is a SS10 so I don't think there're chances that it uses the same PSU as the Classic. By the way, what's wrong with the original parts? |
Transistors
On Saturday, July 13, 2019 at 8:53:53 PM UTC+10, Richard Edwards wrote:
Hi Folks Having some trouble finding some transistors. I am repairing a switch mode power supply and have a number of transistors that need replacing. The issue is I can't seem to find them online....maybe my google fu is out of whack or I have forgotten something obvious. Any way there are 3 different types of transistors first is marked as follows 2001 -2J Second 2005 -2I third P4M 25 if anyone can help me out or point me in the right direction that would be greatly appreciated. Regards Richard Thanks to everyone for the responses and offers. I think I have enough to go on. Will update once/if i resolve... |
Transistors
On Friday, July 19, 2019 at 10:55:12 AM UTC+10, Richard Edwards wrote:
On Saturday, July 13, 2019 at 8:53:53 PM UTC+10, Richard Edwards wrote: Hi Folks Having some trouble finding some transistors. I am repairing a switch mode power supply and have a number of transistors that need replacing. The issue is I can't seem to find them online....maybe my google fu is out of whack or I have forgotten something obvious. Any way there are 3 different types of transistors first is marked as follows 2001 -2J Second 2005 -2I third P4M 25 if anyone can help me out or point me in the right direction that would be greatly appreciated. Regards Richard Thanks to everyone for the responses and offers. I think I have enough to go on. Will update once/if i resolve... So just to round this out the replacements were 2n2001 2n2005 P4M Also had to replace a B688 PSU now working. Thanks to all who offered assistance and ideas. |
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