[TVARC] Need Some Parts For My “QJE-50A SMPS!”

[doncrosby at aol.com]

Tom
I took a quick look in my junk box's and zero-ed out on your parts.
When I have more time I will look again.
Suggestion:  Were I trying to fix the PS, 
1- I would "tack-in" a 1 amp bridge, then the transistors with low power ones etc and see if I could get it to run at say 1/2 amp. 
2- If it was good I world begin to substitute in the hi power / expensive replacement parts.
In other words, sneak-up on getting it running. 
Important >>>> Many times switcher failures are the result of a bad regulator IC, so I would plan on needing to replace that one too.
Don W1EJM


-----Original Message-----
From: Tom G <tgrosvenor3 at comcast.net>
To: TVARC Group Email <tvarc at mailman.qth.net>
Sent: Wed, Jan 9, 2019 9:04 pm
Subject: [TVARC] Need Some Parts For My “QJE-50A SMPS!”

Hi, Folks!
My 50A Switching Supply gave up the ghost 👻 last year.  I finally got to repairing my “New” (out of warranty) supply and have discovered the issues.  As I noticed that each of the NPN Power Transistors had cracked and lifted lands due to stress caused by their Heat Sinks!
The two failed transistors took out two caps and two resistors.  They overheated and also went poof!

Long story short... I was wondering if anyone has these parts?
(2)  1.8 Ω, 1 Watt, Metal Film Resistors
(2)  1 pF, 1 kV Ceramic Disc Caps
(2)  2SC3714  (NPN)  Power Transistors  (TO-3PL Package)
(2)  40CPQ100  Schottky Rectifiers  (TO-247AD Package)
If you are able to help me out, please let me know!
TNX Folks!73,Tom G... NV1UTVARC VP & Program Coordinator SKCC #18720 ~ QCWA #37530
| 
 | 
 | 
 | 
 | 
 | 
 |   | 
 |
| 
 |

______________________________________________________________
TVARC mailing list
Home: http://mailman.qth.net/mailman/listinfo/tvarc
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:TVARC at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/tvarc/attachments/20190110/973e3ecb/attachment.html>