Circuit Board; Prcd (Portable Residual Current Device) - Husqvarna K4000 Workshop Manual

4. Remove the locking button and spring.
5. Remove the switch.
6. Remove the two screws for the left handle.
7. Remove the screw. Move the circuit board to the
side.
18 - Repair and servicing
8. Remove the screws.
9. Remove the carbon brush holders.

6.3 Circuit board

The circuit board has two functions, Softstart and
™
Elgard . Softstart gives a soft start with less current.
™
Elgard gives a warning by changing the speed if there
is an overload.
6.3.1 To examine the circuit board
1. To examine the circuit board, special equipment is
necessary. As an alternative you can use a process
of exclusion. Examine the Power supply, cables,
switches, stator and rotor. If they are operating, the
problem is with the circuit board. It must then be
replaced.

6.4 PRCD (Portable Residual Current Device)

The current that comes in through the phase conductor
must also go through the 0 conductor. The conductors
run through a coil. If the same current goes in the two
directions, there will be no current in the coil. If there is a
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