TVR 10241 capacitor???

Discussion in 'Electronic Repair' started by BigBadger, Jul 6, 2004.

  1. BigBadger

    BigBadger Guest

    Hi,
    I've been given a friends PC Power supply to repair. It's a Enermax EG651
    (550W) model. It was damaged when he plugged it into a 240V supply while
    the voltage select switch was on 115V (Doh!!).

    Anyway a quick visual shows that two large ceramic capacitors are blown.
    The capacitors are mounted next to where the wire from the voltage select
    switch joiuns the pcb. They are marked Z1 and Z2 on the pcb and TVR 10241
    on the components themselves, they are about 10mm diameter.

    Does anyone know what rating these are?

    Also if anyone knows what further damege may have been done (hopefully none
    )

    Replace 'NOSPAM' with 'btinternet' to reply to my email.
     
    BigBadger, Jul 6, 2004
    #1
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  2. BigBadger

    BigBadger Guest

    "BigBadger" <> wrote in message
    news:Xns951ED0FEAEB1Abigbadgerbtinternet@195.92.193.157...
    > Hi,
    > I've been given a friends PC Power supply to repair. It's a Enermax EG651
    > (550W) model. It was damaged when he plugged it into a 240V supply while
    > the voltage select switch was on 115V (Doh!!).
    >
    > Anyway a quick visual shows that two large ceramic capacitors are blown.
    > The capacitors are mounted next to where the wire from the voltage select
    > switch joiuns the pcb. They are marked Z1 and Z2 on the pcb and TVR 10241
    > on the components themselves, they are about 10mm diameter.
    >
    > Does anyone know what rating these are?
    >
    > Also if anyone knows what further damege may have been done (hopefully

    none
    > )
    >
    > Replace 'NOSPAM' with 'btinternet' to reply to my email.


    I've been advoised that the components are most likely MOV surge
    arrestors... Same question applies though... where can I get them and what
    rating?
     
    BigBadger, Jul 6, 2004
    #2
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  3. BigBadger

    Franc Zabkar Guest

    On 6 Jul 2004 19:28:18 GMT, BigBadger <> put
    finger to keyboard and composed:

    >Hi,
    >I've been given a friends PC Power supply to repair. It's a Enermax EG651
    >(550W) model. It was damaged when he plugged it into a 240V supply while
    >the voltage select switch was on 115V (Doh!!).
    >
    >Anyway a quick visual shows that two large ceramic capacitors are blown.
    >The capacitors are mounted next to where the wire from the voltage select
    >switch joiuns the pcb. They are marked Z1 and Z2 on the pcb and TVR 10241
    >on the components themselves, they are about 10mm diameter.
    >
    >Does anyone know what rating these are?
    >
    >Also if anyone knows what further damege may have been done (hopefully none
    >)


    These two disc shaped components are MOVs (metal oxide varistors) with
    a breakdown voltage of 240V (?). I'm betting they are connected across
    each of the two main filter capacitors. In normal operation each of
    these caps charges to around 175VDC. If the SMPS is wired for 110V
    when connected to a 240VAC supply, then these caps will attempt to
    charge to 350VDC. The MOVs prevent this from happening ...
    catastrophically and sacrificially. If you are lucky, only an
    additional fuse and NTC resistor may need changing. It may be a good
    idea to remove the voltage selector switch and its two wires if you
    intend to operate the PSU solely from a 240VAC supply. This switch is
    open in 240V mode. You can also leave out the MOVs in this case, or
    replace them with two high value resistors, eg 220K 0.5W, if not
    already present.


    - Franc Zabkar
    --
    Please remove one 's' from my address when replying by email.
     
    Franc Zabkar, Jul 7, 2004
    #3
  4. BigBadger

    Franc Zabkar Guest

    On 6 Jul 2004 19:28:18 GMT, BigBadger <> put
    finger to keyboard and composed:

    >Anyway a quick visual shows that two large ceramic capacitors are blown.
    >The capacitors are mounted next to where the wire from the voltage select
    >switch joiuns the pcb. They are marked Z1 and Z2 on the pcb and TVR 10241
    >on the components themselves, they are about 10mm diameter.
    >
    >Does anyone know what rating these are?


    See http://www.sicovend.ch/uploads/TVR.pdf

    They are rated at 240V nominal, with a maximum clamping voltage of
    200VDC.


    - Franc Zabkar
    --
    Please remove one 's' from my address when replying by email.
     
    Franc Zabkar, Jul 7, 2004
    #4
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