Astron RS-35M Not working after Lightning Storm

Discussion in 'General Technical Questions and Answers' started by NU9S, Aug 21, 2018.

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  1. KC8VWM

    KC8VWM Ham Member QRZ Page

    If you're going to junk it , why not open it up and turn it into a learning opportunity?

    It's not like you're going to lose anything.
    N3AB, KK5JY and KD8DEY like this.
  2. KA9JLM

    KA9JLM Ham Member QRZ Page

    Is the radio still working, Using another supply ?
  3. NU9S

    NU9S Premium Subscriber QRZ Page

    I have a good volt ohm meter if I knew what to check.
  4. WA9SVD

    WA9SVD Ham Member QRZ Page

    The "repeater's builder" website is a good place to start, as well as the chapter on power supplies in the ARRL Handbook.
    W7UUU and KK5JY like this.
  5. KD8DEY

    KD8DEY Ham Member QRZ Page

    Donate it to the local club, Or see if somebody at the club will elmer you through it.
    If I could afford postage, I would say send it to me, I'll play with it.
    Supposed to be getting my eyes fixed starting next month....
    KK5JY likes this.
  6. AI3V

    AI3V Ham Member QRZ Page

    Start by measuring the DC voltage at the big capacitor, the one the size of a soup can.

    What do you have there?

    Astrons are easy peasy to troubleshoot, I'll walk you through the process.

    N3AB and KD8DEY like this.
  7. NU9S

    NU9S Premium Subscriber QRZ Page

    I pulled the cover off and this is what it looks like. Which one do I measure? By the way I really appreciate the help.

    [​IMG] [​IMG]
  8. AI3V

    AI3V Ham Member QRZ Page

    They should be in parallel, so either one is ok, they should of course read the same.


    PS. I'm going to try and turn on the feature to send this thread to my email so I can keep up, if I dissapear I'll be right back! :)
  9. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    Did you go here and look at the simplified/annotated schematic?

    It looks like this and includes test point voltages for the LM723 regular IC which is on the little circuit board; the image below won't have the explanation balloons functional, but the diagram on that web page does.
    RS-35M simplified and annotated.PNG
  10. KK5JY

    KK5JY Ham Member QRZ Page

    Yes, the Astron linear supplies are not throw-away items. They are very repairable, even with very basic tools.

    It's unfortunate that our service now offers so little training that such a well-documented and simple power supply goes in the trash so easily. :(
    N5RFX, N1DQQ and WN1MB like this.

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