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Help finding function generator schematics

Sam Carter

Dec 21, 2015
1
Joined
Dec 21, 2015
Messages
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I have an old function generator that I want to repair for work and I cannot seem to find any information about it. I do not even have the name of the manufacturer. I figured I would ask on here to see if anyone can help.

The model is "Model 339 Digital Ramp/Step Function Generator" but I can find no company name anywhere on it. If I can figure out the company that made it I might be able to contact them to get some info and prints.

I have attached a picture of the front and back. If anybody recognizes it or has some insight into who might have made this please let me know! Thanks!

Sam
I&C Instructor
 

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  • Front.jpg
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dorke

Jun 20, 2015
2,342
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Jun 20, 2015
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2,342
Not much hope without the manufectur name(and that is strangeo_O).
Have you looked on the PCBs,transformer etc. for a clue?
What is problem with it?some can be solved withot schematics(PS related etc.)
 

K.J.

Sep 28, 2023
1
Joined
Sep 28, 2023
Messages
1
I came across your post as I was searching for info to repair my ramp/step generator.
Have you been able to find any prints, parts, BOM, etc?
I have a Model 339A which was modified in probably the late 80's or early 90's. Looks to be quite similar to your 339.
I do have a manufacturer ID tag showing Exact Electronics Inc. Can't find much info online.

The problem I am having is that the output voltage will not change and is "stuck" at about 14VDC.
I am assuming there is a problem with the D/A Converter or output driver.

Thank you,
K.J. - I&C Tech
 

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  • Ramp-Gen Tag.jpg
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