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MA6100 keeps blowing rectifier diodes...

Discussion in 'McIntosh Audio' started by smartin53, Dec 11, 2017.

  1. smartin53

    smartin53 Well-Known Member

    Messages:
    509
    Location:
    Denver
    This a new issue...MA6100 worked but a few months ago blew a rectifier diode. I just got some new diodes just in case it was just worn out parts but nope. The same higher spec diode blew immediately and tripped the breaker again.

    So...my immediate thought is that one of the main power transistors went.

    Thoughts?
     

     

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  2. clinic-audio

    clinic-audio all on YAMAHA untill 1990

    Messages:
    2,142
    Location:
    France
    Hello smartin53

    1)check where is the short before to replace any component
    2) if your diode is dead , there is a reason why
    3) if you get a short with your diode bridge , check your electrolytic capacitors , they don't like to be shorted
    4) take off the 4 TO3 output transistors and see if the short still there
    very strange that fuses (F5A) did not act

    come back with report
     
    CruzBay likes this.
  3. smartin53

    smartin53 Well-Known Member

    Messages:
    509
    Location:
    Denver
    So to resurrect an old thread....I finally got back to the 6100. Ran through all of the above and found no issues.

    Then I started rechecking my work and discovered one of the new diodes that blew was backwards. Oops dummy mistake. Replaced all and in the correct orientation this time and all is good. Unit is back up and running.

    Tis possible in the process of checking all the components I corrected a hidden fault, but it is possible the root original issue was just a faulty diode.
     
    CruzBay likes this.

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