Husqvarna 536LiP4 - Troubleshooting the Main Switch

18 – English
Diagnosis and troubleshooting
Fig3
Fig5
1 2 3 4 5 6
M1
B-
B+
B-
M
6.4 Troubleshooting the main switch
The switch used in professional battery products
from Husqvarna has two functions, to supply
current to the control unit and the electric motor,
and act as a position sensor for the variable speed
control. All these functions can easily be tested and
verified using a resistance meter.
Note: The switch should not be depressed more
than 6 mm and not to its end position when
testing.
•Measure between B+ and B1 when the switch is
not depressed. The result should be open circuit.
•Measure between B+ and B1 when the switch is
depressed. The result should be closed circuit.
•Measure between pin 2 and pin 5 when the
switch is not depressed. The result should be
closed circuit.
•Measure between pin 2 and pin 5 when the switch
is depressed. The result should be 50 kΩ ± 25 %.
•Measure between B1 and Pin 1. The result should
always be closed circuit.
See figure 3
If all readings are within specified limits, the switch
is OK.