Troubleshooting The Main Switch - Husqvarna 536LiP4 Workshop Manual

Diagnosis and troubleshooting

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.
18 – English
M1
1 2 3 4 5 6
Fig 3
Fig 5
M
B-
B-
B+