*PHOTO* Need help- WHAT DIODE IS THIS?

Discussion in 'The Projects Forum' started by bigcape, Sep 22, 2009.

  1. bigcape

    Thread Starter Member

    Sep 18, 2009
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    I think this diode is bad.
    It meters .0L both ways. However there are no markings can anybody tell?

    I am repairing an analog multi-meter. (attempting that is )

    Thank you for the help!

    [​IMG]

    here is another

    [​IMG]
     
    Last edited: Sep 22, 2009
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    It could be about any old glass-passivated diode. It's not big enough to be a rectifier. You can always try a 1N914 - good luck figuring where the cathode points.
     
  3. bigcape

    Thread Starter Member

    Sep 18, 2009
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    That will be easy because it is printed on the circuit board I took it from!:)
     
  4. bigcape

    Thread Starter Member

    Sep 18, 2009
    158
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    [​IMG]

    It came out of the top right corner

    Why cant you test components soldered in place if you just meter on opposite leads of the component?

    What I was reading about electron flow, the positive and negative leads of the multimter would be the "circuit" right?
     
    Last edited: Sep 22, 2009
  5. studiot

    AAC Fanatic!

    Nov 9, 2007
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    Beware of loosing the ball bearing from the switch rack.
     
  6. salty9

    New Member

    Jun 8, 2009
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    If you don't isolate the circuit component you are also reading the rest of the circuit.
     
  7. bigcape

    Thread Starter Member

    Sep 18, 2009
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    No kidding... I dropped once!

    Open yours up and tell me what diode to use!!

    Im going to fix this thing till it's REAL BROKE!
     
  8. bigcape

    Thread Starter Member

    Sep 18, 2009
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    I went to two places to see if anything "looked" the same.

    NO LUCK!

    But I ended up buying a HAKKO FX-951 and an 808 desolderer.

    This project is getting expensive.
     
  9. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    What is the model number of your multimeter?

    You might find a schematic on the internet ... or maybe not.
     
  10. bigcape

    Thread Starter Member

    Sep 18, 2009
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    Excelent Idea JOE!

    [​IMG]
     
  11. bigcape

    Thread Starter Member

    Sep 18, 2009
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    Funny thing is...... all the links that sound promising take me RIGHT BACK TO THIS SITE!!!!

    oh, no schematic!
     
  12. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    I noticed the sensitivity of that meter was 2k/V. That's going to load down alot of the circuits you'll want to build ... and it could introduce some unwanted results to the circuit.
     
  13. bigcape

    Thread Starter Member

    Sep 18, 2009
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    Thank you for the tip.

    This more of a learning experiment. I have a nice Auto-Ranger.

    I'm using this broken meter to teach myself all kinds of stuff.

    Heck, I found my FIRST bad component--- All by my lonesome!

    (with help from all the great reading on this site):D
     
  14. bigcape

    Thread Starter Member

    Sep 18, 2009
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    bump! It's been over 1week n 1/2!
     
  15. SgtWookie

    Expert

    Jul 17, 2007
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    It's not worth repairing.

    Get a new one and start over.
     
  16. bigcape

    Thread Starter Member

    Sep 18, 2009
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    Who cares? That isn't the point.

    Let's turn it into a contest then..... "Guess the Diode"
     
  17. t06afre

    AAC Fanatic!

    May 11, 2009
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    I guess you have "reverse engineer" the PCB back to a schematic. Then we may be able to help.
     
  18. beenthere

    Retired Moderator

    Apr 20, 2004
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    Any cheap little signal diode is going to work. If you are concerned about voltage and current, consider the meter isn't much, and you're risking on the order of $.05.
     
  19. Wendy

    Moderator

    Mar 24, 2008
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    Shoot, I still have a reel of 1N4007 I paid $1 for. What's that, about 1/10¢
     
  20. beenthere

    Retired Moderator

    Apr 20, 2004
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    Guess he could try a 1N1186 to play safe. Have to make a hole in the case, though.
     
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