Tools Featured in this Teardown

Introduction

Find out what makes a cordless drill/driver whirr.

This teardown is not a repair guide. To repair your DirectPower DE157 Cordless drill-screwdriver, use our service manual.

The driver kit. This is a more-or-less no-name cordless screwdriver/drill kit, but its construction more or less matches most of these devices.
  • The driver kit.

  • This is a more-or-less no-name cordless screwdriver/drill kit, but its construction more or less matches most of these devices.

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The charger consist of a standard wallwart, output 14.4V 350mA, along with a little block (weighing nothing at all) to connect to one of the battery packs. To open the charger block, unscrew three #1 Phillips screws. To open the charger block, unscrew three #1 Phillips screws.
  • The charger consist of a standard wallwart, output 14.4V 350mA, along with a little block (weighing nothing at all) to connect to one of the battery packs.

  • To open the charger block, unscrew three #1 Phillips screws.

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Deck the Halls
With tools and Fix Kits
After lifting off the bottom, the PCB is exposed, and you can lift it out of the charger block along with the battery contacts. On the PCB we find: A diode to protect against reverse current.
  • After lifting off the bottom, the PCB is exposed, and you can lift it out of the charger block along with the battery contacts. On the PCB we find:

    • A diode to protect against reverse current.

    • An LED and resistor that is on so long as the box gets power.

    • A giant 10 Ohm resistor to slightly current-limit the charge, and across which the green led and resistor are placed -- this will therefore light up as long as significant current passes to the battery.

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One of the two battery packs. To open, remove Four #1 Phillips screws.
  • One of the two battery packs. To open, remove

    • Four #1 Phillips screws.

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After removing the screws, turn right side up again and lift off the plastic cover, exposing 12 NiCd cells in a string, and nothing else. Note that there is room on the right side for three more cells, which would make a 18V battery pack. Especially cheaper makers usually have versions for 7.2V/9.6V/12/14.4/18V all using the same plastic, just more or less cells and a different motor.
  • After removing the screws, turn right side up again and lift off the plastic cover, exposing 12 NiCd cells in a string, and nothing else.

  • Note that there is room on the right side for three more cells, which would make a 18V battery pack.

  • Especially cheaper makers usually have versions for 7.2V/9.6V/12/14.4/18V all using the same plastic, just more or less cells and a different motor.

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Jasper

Member since: 05/02/2010

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