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Bosch AL 1860 CV Faulty Resistor Replacement

Introduction

Bosch charger AL1860 CV for 18V batteries for lawnmowers/garden tools no longer charges. Replacement of a resistor (R3 = 220 kOhm).

Credits: https://www.eevblog.com/forum/beginners/...

  1. Bosch AL 1860 CV Faulty Resistor Replacement, Remove the AC plug: step 1, image 1 of 1

    • Remove the AC plug

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  2. Bosch AL 1860 CV Faulty Resistor Replacement, Open the charger: step 2, image 1 of 1

    • Open the charger (remove 4 Philips screws)

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  3. Bosch AL 1860 CV Faulty Resistor Replacement, Find Resistor R3: step 3, image 1 of 1

    • Localize resistor R3

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    • Detach the circuit board from the housing (4 plastic tabs)

    • Caution: Capacitor (150uF/400V) may still be charged!!!

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  6. Bosch AL 1860 CV Faulty Resistor Replacement, Obtain new resistor: step 5, image 1 of 1

    • Obtain new 220k Ohm 2W resistor

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  7. Bosch AL 1860 CV Faulty Resistor Replacement, Desolder R3: step 6, image 1 of 1

    • Resistor R3 needs to be desoldered

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  8. Bosch AL 1860 CV Faulty Resistor Replacement, Replace resistor R3: step 7, image 1 of 1

    • Solder resistor R3 in place

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Conclusion

Follow the steps in reverse order to reassemble the device

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Thomas Zurbrügg

Member since: 03/29/21

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1 Guide Comment

Hi! I want to convert same charger from 220v to 110v to use on construction sites,its that possible?

Bogdan Ulici - Reply Share

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