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Thread: Hi new member - looking for help with an MCM Icon8 alarm

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    Default Hi new member - looking for help with an MCM Icon8 alarm

    I have an older MCM Icon 8 alarm that stopped working - power icon comes on
    Having a look at the motherboard I don't see any of the magic smoke that's come out

    Further looking into it, the battery isn't charging...
    When I connected up a charged battery the system seems to work, except for the chirping of the no AC power supply (measured at 18V A/C) out of the control pads

    The voltage regulators (2x L7805CV) have 5V out, but the ground (centre pin & heatsink) is also 5V (measuring from battery earth, no battery connected) - so I'm thinking its an earth fault, but can't figure out how the battery will charge as that should be a separate regulator (or something)


    So if anyone with knowledge can guide me, that would be great
    Else suggestions of replacement board?

    Appreciate your help
    12star



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    Suggest you look at Bosch Solution 2000 or 3000 and Hills R128 as replacement.

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    I vaguely remember there is an issue with that model whereby it indicates there is no AC connected, even though there is. It's something to do with a failed protection diode or similar component from memory. Try googling MCM Electronics in Sydney and calling them. They might be able to help you.

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    Cheers, that sounds about right as it doesn't seem to major, I'll give them a call.

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