Andreas Stihl Ag Co. Kg

Robert Böker

Andreas Neubauer

Heiko Däschner

The invention relates to a portable handheld work apparatus such as a cutoff machine, motor-driven chain saw, brushcutter, blower apparatus or the like. The apparatus includes a drive motor () for driving a work tool () and is provided with a security circuit (). The security circuit () switches the drive motor () of the work apparatus into an operational-ready state or into an out-of-service state in dependence upon received signals of a receiver unit (). The receiver unit is configured to receive at least one operating code. The receiver unit () is configured for receiving a service code () and, with the receipt of a service code, switches the drive motor into only a temporary service state.

Use block for a handheld work apparatus

In a method for operating a power tool with a diagnostic device, wherein the power tool has an internal combustion engine, a generator as an energy supply, and an electronic control unit, wherein a diagnostic device is connectable to the electronic control unit, and wherein the electronic control unit has an operating mode and a diagnostic mode, a non-uniform voltage signal is supplied by the generator as an energy supply and a uniform voltage signal is supplied by the diagnostic device as an energy supply. The electronic control unit evaluates the voltage signal that is being supplied as an energy supply and switches to diagnostic mode when the voltage signal is the uniform voltage signal supplied by the diagnostic device.

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Winnenden, Germany

Robert Böker