MELF diodes marking codes

Discussion in 'Electronics Resources' started by Onilll, Jan 24, 2014.

  1. Onilll

    Thread Starter Member

    Oct 25, 2010
    38
    0
    Hi,
    if someone can help recognize:

    [​IMG]

    may be someone have code book for this diodes?
     
    Last edited: Jan 24, 2014
  2. MrChips

    Moderator

    Oct 2, 2009
    12,449
    3,368
    From Wikipedia:

    Perhaps you can tell us a bit more about the board and what unit it is from.
    A photo that shows a wider view of the board would help.
     
    Last edited: Jan 24, 2014
  3. Onilll

    Thread Starter Member

    Oct 25, 2010
    38
    0
    Whole board from Lenze VFD

    [​IMG]

    part of this board with diode

    [​IMG]
     
  4. MrChips

    Moderator

    Oct 2, 2009
    12,449
    3,368
    Why do you suspect the diode needs replacing?
     
  5. Onilll

    Thread Starter Member

    Oct 25, 2010
    38
    0
    check with tracker, do not see any signature up to 50 volt.
    check with multimeter as diode and have 1.93 in both directions.
    i do not think its a tvs higher than 50 volt on this board.
    all other same melf diodes have green or grey color band and i see diode signature on tracker and multimeter voltage in one direction 0.61 volt
     
  6. john_doe01

    New Member

    Nov 27, 2011
    24
    0
    If memory serves its an 8.2V zener, im pretty sure the 3 stages are identical and a good one from another stage can be used to check, ive also had a ot of issues with the pulse transformers going faulty
     
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