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Lucent alarm unit ES643

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  • #63324

    Good evening. I have a Lucent ES643 alarm/control unit & ES661C rectifier sitting on my bench for cleaning and repair.
    All looks good with output voltage and alarm sensing.

    Is anyone familiar with dip switch settings on the alarm unit board for output voltage range selection?

    I replaced the front panel trim pot to restore DC output adjustment and currently have good high output alarm & cutout at approximately 27.70 Volts.

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