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Dc9700a charger schmatic

My charger will not reset and charge my battery. An Electronic man checked diodes, resistors, etc but can't check everything without a schematic. Can you help?

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  • David Ford
    David Ford May 11, 2010

    All the charger schematics I have seen are not specific as to the electronics. Usually if the board goes bad they want you to replace the unit. But if you can provide the brand and model number I will see if I can help further. Dave

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Check that the black microswitch is operating when a battery is placed in the charger. The microswitch button is pressed by a blue plastic piece. Over the years, the part of the blue plastic that the battery slides over wears down so that the switch does not operate. You can check it by slowly inserting a battery and listening for the switch to click.

I made a temporary fix by grinding down a stop on the blue plastic actuator so that it sticks more into the battery well, then wrapping tape around the portion that actually presses on the switch.

I doubt that you will be able to purchase that plastic actuator, but you might be able to find a used working charger on your favorite auction site.

Posted on Apr 03, 2010

  • zerotsm Apr 03, 2010

    Followup: The microswitch is only activated for certain batteries, the ones with the wide black strip along the length above the negative terminal. The ones with the narrow strip are not supposed to activate the microswitch.

  • zerotsm Apr 03, 2010

    The 7.2 batteries are the one with the wide strip, the 9.2 has the narrow strip. If your batteries are totally shot they will not charge, but usually the red light will come on for a few seconds and then go out when the circuit breaker trips (yellow button to reset it).

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