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Old 11-28-2009, 07:29 PM #1
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Default Help finding output transistor SML2195

Does anyone know the cross reference # for a SML2195 output transistor.(or how I could find it)
I need 5 of them to repair my LKB 2103 power supply.
I have searched the web for 3 days now, with no luck.
Somebody please help me find these parts.


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Old 11-28-2009, 07:48 PM #2
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Default Re: Help finding output transistor SML2195

I found this .PDF with Flyer for your PS...
At the bottom is the company address and Phone number..

Do you have a schematic of your PS..

How about a photo of the damaged transistors... are they NPN
or PNP... Maybe a generic replacement could work...


Jerry
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Old 11-28-2009, 08:55 PM #3
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Default Re: Help finding output transistor SML2195

Jerry,
Quote:
I found this .PDF with Flyer for your PS...
At the bottom is the company address and Phone number..
Thanks, I have the Co. address, going to call them monday. Hopefully they will release that information. You know how some companys are: You'll have to send it back, $1000's of dollars bla,bla,bla
Quote:
Do you have a schematic of your PS..
No, unfortunately I don't have schematics, I wish I did. I've looked on the net untill my eyes fuzzed out. All I found was that flyer "Yours truly ,from LKB"
Quote:
How about a photo of the damaged transistors... are they NPN
or PNP... Maybe a generic replacement could work...
Here are a couple photos.


Thanks for the help. I spent a fortune on this PSU and only used it 4 or 5 times before it fried. I am so bummed.
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Old 11-28-2009, 11:11 PM #4
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Default Re: Help finding output transistor SML2195

Google crapped out on me too. Those TO3's are likely not FETs . Are the all bad? If there's one good one, you might be able to determine what it is. Then put in the biggest bastards you can find. Usually in switching drivers, beta isn't too important. Watch Vce and Ice most.

HMike

Are these drivers wired in parallel? If so, eliminate (remove) the bad device and see if it will run at lower power. What kind of base (gate?) resistors do you find? If low resistance, those are likely transistors. OH, I see the "collectors" are tied together. With some luck, basic replacement transistors will work.
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Last edited by Hemlock_Mike; 11-28-2009 at 11:17 PM.
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Old 11-29-2009, 01:46 AM #5
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Default Re: Help finding output transistor SML2195

Quote:
Are the all bad? If there's one good one, you might be able to determine what it is. Then put in the biggest bastards you can find
No, unfortunately all of them are shorted. Along with a large(2 watt) resistor(smoked and open) and a diode(open)

Quote:
What kind of base (gate?) resistors do you find? If low resistance, those are likely transistors.
The base resistors measure 1.304 ohms.
This one has me stumped.
I downloaded a 34Mb cross reference for transistors. I spent 5 hours looking through 250+ pages for this # with no luck.
I was not even driving it hard(1250V@4.0mA) when it smoked. I did notice the day before, when I turned it on and tried to adjust the voltage, when i turned past 100V the mA meter would swing all the way to max(200mA)
I turned it off and back on and then it was alright. Not a good sign
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Laser count = {88}
Builds by me = 19
670nm=2
650nm=33
635nm2
532nm=14
445nm=2
405nm=13
Scanners and Other Show Lasers=8
Red & Green He-Ne lasers=15
488nm Argon and other Gas Lasers=1
Laser tools (not included in total)=12
METERS
Kenometer Lite
Metrologic Photometer
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