Parts Identification on Treadmill Board

Discussion in 'General Electronics Chat' started by SteveDouglas, Sep 22, 2013.

  1. SteveDouglas

    Thread Starter Active Member

    Apr 30, 2009
    42
    2
    On the MC-60 board, can anyone tell me specifically what diode D10 is ?

    It's the silver diode just to the left of C10 and R28 in this pic below.

    Although on my boards they are glass type diodes, not silver.

    Thanks,

    Steve
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,505
    2,367
    Could be a zener, but there should be a number on it to identify?
    One link in a search pins it at a 12v zener?
    The number should confirm.
    Max.
     
    Last edited: Sep 22, 2013
  3. SteveDouglas

    Thread Starter Active Member

    Apr 30, 2009
    42
    2
    Do you mean from this ? (ZD1 in pic below)

    It was shattered so I couldn't read it. On another board I have it looks like

    1N4
    42

    But I'm not sure, couldn't read it very well, even with 10x magnification it wasn't clear.

    Thanks for your reply !
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,505
    2,367
    I don't think that is the complete number The schematic I found showed a part number which I believe is incomplete as it turns up as a 150v zener, but it is labeled as 12v.
    If the one on the board is in good shape you should be able to get the No. off it.
    Do you suspect it for some reason?
    Max.
     
  5. SteveDouglas

    Thread Starter Active Member

    Apr 30, 2009
    42
    2
    Hi Max, I don't suspect it, it was shattered. I have the 4 LED's remotely located from the board and the 12 volt power LED accidentally got shorted to the machine and the diode was then shattered. I removed the diode D10 from another board and that's where I got that "1N442" (?) from, and replaced the shattered one with it.

    The board works now and I'm trying to find out for sure what diode I need to replace on the donor board I stole from because I need that "donor" board working too. I think you're right that it's a Zener.

    Thanks
     
  6. Meixner

    Member

    Sep 26, 2011
    116
    21
    Most likely it is a 1N4742 which lists as a 12 Volt 1 Watt zener diode.
     
  7. #12

    Expert

    Nov 30, 2010
    16,250
    6,746
    You said the board works now, so measure it. One volt meter, one lead on each end of the diode. Positive should be on the end with a stripe.
     
  8. SteveDouglas

    Thread Starter Active Member

    Apr 30, 2009
    42
    2
    The board that works is now deep inside a machine and I can't access the diode to take a reading on it without removing it. I'll keep searching, it probably is a 4742, thanks for that.

    Thanks for all the replies, I appreciate the help !
     
  9. SteveDouglas

    Thread Starter Active Member

    Apr 30, 2009
    42
    2
    Looks like it's a 1N742.

    I just found this schematic:
     
  10. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,505
    2,367
    That is the schematic I referred to in the previous post, but that number I believe is incomplete, as the 1n742 shows up as a 150v zener.!!
    The 12v description is most likely the one.
    Max.
     
  11. SteveDouglas

    Thread Starter Active Member

    Apr 30, 2009
    42
    2
    OK, thanks Max. I wish I had asked you what schematic you were looking at !!! I spent hours searching.

    I'll get the 12 volt Zener. Maybe having that schematic in this thread will help others in the future.

    Thanks again !
     
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