Husqvarna DM220 Workshop Manual page 19

Circuit board
The circuit board is divided into two interconnected units that cannot be
shared.
The unit on the right has two functions. It senses the motor's speed and
also has a function that acts as an electronic spirit level "Level guiding sys-
tem".
All information from the unit is passed on to the circuit board, to the left
in the illustration.
The circuit board gives the machine the following functions:
Softstart™ is an electronic current limiter for smoother starting.
®
SmartStart
gives reduced speed when the circuit breaker is pressed in
halfway.
Elgard™ is an electronic overload protection device.
Function test
The functions of the circuit board require special expertise and special equip-
ment in order to be tested. The exclusion method must apply instead. First
test that the stator, rotor, cables, contacts, connectors, etc. are not defective.
Only replace the circuit board after this check.
Flat cable
The connector to the flat cable has a locking function. To remove the flat
cable, first press the connector to the left, according to the illustration on the
right, after which the flat cable is removed.
Assemble in reverse order.
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