By-pass a lenier transient surge absorber resistor

Discussion in 'General Electronics Chat' started by Gdrumm, Aug 27, 2011.

  1. Gdrumm

    Thread Starter Distinguished Member

    Aug 29, 2008
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    36
    I picked up a small oscillating fan, that had blown the fuse on the board, and it had a blown ZNR right next to the fuse?

    I tried to take a picture, but my camera won't focus.

    It smaller than a dime, bright green with two wires coming out of the bottom.
    Some of the numbers are missing, I can only see:
    NFV 10024....... (missing letters /numbers)
    5u, with C as a 1/2 circle around the letters SF
    V19..... (missing letters / numbers)
    then VDE in a small triangle at the bottom.

    I googled it and found that Panasonic invented the ZNR as a sort of surge protector.

    Can I bypass it? Put a jumper wire in its place?

    Or, can I substitute a similar one I harvested for old scrap devices?

    It seems like if I replace the fuse, and jumper across the ZNR,that the fuse should be protection enough.

    Thanks,
    Gary
     
  2. praondevou

    AAC Fanatic!

    Jul 9, 2011
    2,936
    488
    No. You can not put a jumper instead of a surge protector. You can take out the defective surge protector and leave it like this or you can replace it.

    The surge protector is probably right at the mains input. Under normal conditions it is not conducting, and it conducts when there is a transient voltage spike on mains, thus dissipating this energy and protecting the rest of the circuit.

    http://en.wikipedia.org/wiki/Varistor
     
  3. Gdrumm

    Thread Starter Distinguished Member

    Aug 29, 2008
    684
    36
    A good link, thanks for the education.

    If I could replace it, would I have to replace it with the exact component?

    I probably have 100 of these varisitors, of various sizes, with hard to decipher markings. How could I be sure I'm using a suitable replacement?


    It's 110v oscillating fan.

    Thanks,
    Gary
     
  4. Gdrumm

    Thread Starter Distinguished Member

    Aug 29, 2008
    684
    36
    Update!

    The fan works good, but the control board is slow to change speeds.
    The timer part of the board doesn't work, now does the power-on LED.

    I think I'll scrap the board, and keep the motor, etc. for spare parts.

    Thanks for your input.

    Gary
     
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