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Diodes

Discussion in 'Troubleshooting and Repair' started by Joebudd, Jun 2, 2020.

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  1. Joebudd

    Joebudd

    7
    1
    Jul 13, 2017
    I have a component question. I am repairing a generator. I have 2 diodes bad. rectifier diodes. Stud type. I have 2 of the same generators, different years. They look identical. Now I pull out the diodes. Try to look up the numbers and don't find much. From what I did find, it appears to be a 20a 600v cathode case diode. Will it be alright if I get a stud diode with the correct amps, voltage, and negative case. Here are the numbers I have off the diode MSC 9118 R2160.
    Thanks for the help.
     
  2. Martaine2005

    Martaine2005

    2,911
    796
    May 12, 2015
    Cathode is negative for a diode.

    Martin
     
  3. Joebudd

    Joebudd

    7
    1
    Jul 13, 2017
    I know that. The case is the cathode. The lead out the top is the anode.
     
  4. bertus

    bertus Moderator

    906
    325
    Nov 8, 2019
  5. Joebudd

    Joebudd

    7
    1
    Jul 13, 2017
    Looks like the unit. Thanks
     
  6. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    Diodes of this style are made in both polarities often with the same number but one polarity has a R added. So be careful you get it right.

    600V 20A diodes should be readily available, Depending on the reason for failier, you could use stronger diodes.
     
  7. Bluejets

    Bluejets

    4,154
    880
    Oct 5, 2014
    According to the spec sheet, as Martaine and Duke pointed out (R) is Anode case and (S) is cathode case.
    As you quoted R2160, then that is Anode case.
     

    Attached Files:

    Martaine2005 likes this.
  8. Joebudd

    Joebudd

    7
    1
    Jul 13, 2017
    Yes I just noticed that. I stand corrected. The R is for reversed and S for standard. I will make sure I check it with my tester and it matches the other ones. Thanks again.
     
  9. Joebudd

    Joebudd

    7
    1
    Jul 13, 2017
    I stand corrected.
     
    Martaine2005 likes this.
  10. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    If you are changing the type then watch the thread, they may be unf or metric. Get with nuts and washers that fit.
     
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