(Topic ID: 139976)

Electrical advise needed please

By Spencer

8 years ago


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    #8 8 years ago
    Quoted from zaza:

    This is what I can make off it.
    Blue-Wht = live
    Yel-Grn = neutral
    Grn = ground
    transfor 2.jpg

    the undefined part seems to be a relay:

    https://abra-electronics.com/electromechanical/relays/itt-takamisawa-or-lz-relays/lz-130-lz-series-spdt-12vdc-lz-130.html

    http://www.fujitsu.com/downloads/MICRO/fcai/relays/lz.pdf

    If you follow the traces, is looks like this:

    pinside-pcb.JPGpinside-pcb.JPG

    Same as zaza showed.

    #12 8 years ago
    Quoted from girloveswaffles:

    Seems to be a relay based on what? A small relay in line with the line voltage on neutral? Doesn't make much sense. More likely to be a choke of some sort. BTW, that part you list is rated at 12VDC. If that's the coil voltage, It'd be toast when line voltage was applied.
    Also, it appears that the at mystery component may have ceen removed, or someone did a real bad solder re-flow job on the back.

    The relay coil is driven with a low voltage (I 5V from the 7805 regulator or think 12V elsewhere from the board or) and is not connected to the inline voltage.

    When the relay-coil is powered, the hot L (NO) is switched over the NC-contact to the 2-pin-Molex connector.

    You will not grill the relay, because the relay-coil has no connection to the (high) inline voltage. Only functio of the relay ist, to switch power to the 2-pin-connector.

    Andy yes, it is a bad reflow solder job, but the missing part you might think of, are VIAs, I think, because they look like new and it seems, that there was no componet before.

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