May be a bad Zener

This topic contains 3 replies, has 2 voices, and was last updated by John C John C 3 months, 1 week ago.

  • Author
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  • #9951

    Derek Lynch
    Participant

    I have a Zener Diode here that measures 1.82 v on the reverse diode test I believe this diode is shot anyone can anyone help? as I think I may have to order some…


  • #9952
    John C
    John C
    Galco Representative

    That is probably a safe bet. Zener diodes basically measure the same as a rectifier type will, except maybe a little higher forward bias voltage like 0.7volt instead of 0.6. Reverse biased they will measure open like a rectifier until you reach the Zener voltage value. Do you know what it is rated?


  • #9953

    Derek Lynch
    Participant

    Thanks for the reply will test the rated voltage with the 1k ohm resistor and 9 v battery but since it is giving me a 1.8v when doing the reverse diode test when it should be OL there is really no point in going further so I ordered the 751 zener . I have the schematic for the Memory Man Deluxe and I already replaced the dead Voltage regulator (it is a -15v), however checking more the Zener also was probably dead as well.


  • #9954
    John C
    John C
    Galco Representative

    Very good Derek, my research shows that a 1N751 is supposed to be a 5.1 volt Zener anyway.


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