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I have a AEG battery drill model BSB14 STX-R serial No 01464F2008.The battery charger has failed.I am experienced in repair of electronic equipment but I need a circut diagram of this charger.The AEG distributor has refused to help,do you know of a web site or other source that might help.

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  • tguy895 Jul 31, 2010

    The solution is helpful.I will work along the lines suggested in the last paragraph.Thanks for the help.

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Hello tguy,

Manufacturer's often hold schematics very close to prevent other companies from stealing designs (as improvements...). Sometimes, you can find a schematic on the patent application (that proves uniqueness of their design) that may more or less match your charger. Revisions likely won't be indicated though.

There are a few things, as an electronics tech, that you can do though. Most of the integrated circuits (regulator, buck/boost circuit, temp sense, etc) found on the board will have data sheets from the manufacturer. Looking at the pinout for each component will help you visualize how the charger is laid out on the circuit board. Occasionally, manufacturers will lift an application note from the datasheet and use it directly.

You know that semiconductors will have unique outputs based on device. Integrated circuits will have to have power (usually regulated) and ground, as well as possible timing / clock inputs and outputs. Find the datasheet, and start checking out the inputs / outputs of each device.

Assuming that your battery is NiCD, just about any charger designed for NiCD batteries will work as long as the battery it was designed for has the same or smaller capacity. A charger for a 14.4v 1700mAh battery will charge a 3Ah battery, just takes longer. NiCD charge termination is determined by the knee voltage, NiMH are similiar, but a much smaller voltage when fully charged. Lithium battery chargers typically are not interchangeable. So, you may be able to use a different charger, but will have to adapt it to fit the battery from your tool. You are also able to build a charger, even with temperature sensing, based on off the shelf integrated circuits from Linear, National, etc.

If you really absolutely need a schematic, and are not able to find one elsewhere, you can always trace out the paths on the board that you have, and enter them 1 by 1 into a schematic / cad package, or onto paper.


Posted on Jul 30, 2010

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