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Faulty D-Link DSL-10CF ADSL Central Filter build!

Discussion in 'Hobby Electronics' started by Grant, Sep 6, 2010.

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  1. Grant

    Grant Guest

    Hi there,

    I've got a three way Central Filter, D-Link DSL-10CF plugged into
    the only phone outlet, with modem and a couple phones plugged into
    it correctly.

    After another ADSL dropout today that coincided with me hanging up
    after a phone call, I swapped the Central Filter for a spare, and
    opened up the D-Link filter out of curiosity.

    Was quite amazed to see that a component G1 is soldered into same
    trace! See the photo linked below.

    The G1 device looks like a large glass diode, probably over-voltage
    protection across the line. Except it is not wired across the line,
    both sides go to the same side of the line. The component outline
    covers three holes in the PCB, and G1 was placed in two holes on
    one side of telecom line, the remaining hole goes to the other side
    of the telecom line.

    This filter was delivered by Dodo along with a DSL-302G ADSL modem
    back in 2004. Not as if I have a warranty claim, but it's odd
    for such a fault to pass production? I would guess the phones and
    modems have their protection as well, so no further damage done.

    Anyway, to see the odd build error, try:

    Wonder if this explained why I get ADSL dropouts anytime a storm goes
    over? Or is that the norm?

  2. Franc Zabkar

    Franc Zabkar Guest

    Gas arrestor?

    BTW, nice find.

    - Franc Zabkar
  3. Grant

    Grant Guest

    Could be, but I thought they were bigger. It's supposed to be straight
    across the phone line, it's sitting directly behind the line socket.

    The resistor is the normal 1/4 W size, for reference.
    Thanks, I don't tend to open things during warranty, unless it can be
    done without breaking labels.

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