zener diode identification help.

Discussion in 'General Electronics Chat' started by Qsilverrdc, Aug 3, 2014.

  1. Qsilverrdc

    Thread Starter Member

    Aug 3, 2014
    34
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    Hi. Thanks for helping.
    I have a round 2 wire device I need to identify.
    Its about 1/4 inch 7mm dia.
    It is marked..
    TNR
    241
    7c22
    I can not find on web.

    Thanks
    Rich
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
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    It appears to be MOV not a zener?
    Is there a problem that you need to identify it?
    Max.
     
  3. k7elp60

    Senior Member

    Nov 4, 2008
    478
    69
    I agree with MaxHeadRoom. The device looks like it has a crack in the case.
    They are designed to absorb a voltage spike, that's what looks like happened.
     
  4. Qsilverrdc

    Thread Starter Member

    Aug 3, 2014
    34
    1
    115ac is across a 5w 3ohm in series with this Device.
    A bridge rectifier taps in parallel with the device.
    It got hooked to 220ac and some smoke came out.
     
  5. MaxHeadRoom

    Expert

    Jul 18, 2013
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    That'l do it. ;)
    Max.
     
  6. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    It's a 7mm 241v MOV.

    Will be easily available from digikey or element14.
     
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  7. Qsilverrdc

    Thread Starter Member

    Aug 3, 2014
    34
    1
    Ok..
    Thanks.. I think I see how its a TVR.
    I have included the circuit that this is in.
    Oh. I found that the 3 ohm resistor is open.
    Hope the squib and resistor are all that are wrong.
    .....
    So to anyone... what voltage is the DC motor.
    It rectifies at about ??? Half wave 170vdc peek.
    So Va to ground after bridge is ??

    This circuit runs a DC motor forward or reverse by rocker.

    I would like to know a little more.

    Rich
     
  8. MaxHeadRoom

    Expert

    Jul 18, 2013
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    If it is a SCR type bridge it will run a 90v motor on 120vac and 180v motor on 240v.
    Max.
     
  9. Qsilverrdc

    Thread Starter Member

    Aug 3, 2014
    34
    1
    Trying to attach schem..
     
  10. MaxHeadRoom

    Expert

    Jul 18, 2013
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    90VDC motor.
    Max.
     
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  11. Qsilverrdc

    Thread Starter Member

    Aug 3, 2014
    34
    1
    Thanks for your help!
    Good to know.
    Rich
     
  12. Qsilverrdc

    Thread Starter Member

    Aug 3, 2014
    34
    1
    After more checking I am now confident that this is a 240V TVR/MOV...
     
  13. Qsilverrdc

    Thread Starter Member

    Aug 3, 2014
    34
    1
    Thanks for all your help. I was able to repair that board.:)
     
  14. ian field

    Distinguished Member

    Oct 27, 2012
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    782
    The "241" is probably the same old 2 digits and multiplier; 240V - would be a fairly generous margin for 110V mains.

    They have a bit of a tendency to shatter or disintegrate when they fail - but I'm not too sure just how bad the resin dipped variety can get before you can see visible signs.
     
  15. b1u3sf4n09

    Member

    May 23, 2014
    115
    14
    Here is the datasheet.
     
  16. Qsilverrdc

    Thread Starter Member

    Aug 3, 2014
    34
    1
    There is another board I am working on fixing.
    The device is about .25" wide .12" thick and .35" tall.
    Silver. I'm pretty sure it's a capacitor of some kind.
    Can sort of see layers thru the end.
    Silver component on left..

    Can anyone tell for sure?

    Thanks.
     
  17. ian field

    Distinguished Member

    Oct 27, 2012
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    There are some pretty good clues in the screen print on the PCB.
     
  18. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    104 polyester cap = 0.1uF.

    In that size it's a 50v part.
     
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