Troubleshooting.the.main.switch; Troubleshooting.the.keypad - Husqvarna LiHD50 Workshop Manual

In addition to troubleshooting with the diagnostic
tool, a potentiometer can be used to troubleshoot
certain parts manually.
Replace damaged parts as described in the rel-
evant chapter.
6.5 Troubleshooting the main switch
The switch used in professional battery products
from Husqvarna has two functions, to supply cur-
rent 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.
NB! 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.
6.6 Troubleshooting the keypad
It is only possible to troubleshoot the keys on the
keypad. Measure pin 1-10 on the FPC on top of
the contact.
See figure 4.
The measuring points are shown in the diagram on
the right.
(1) Switch 1: On/Off
(2) Switch 2: Save E
(3) Switch 3: Pivoting (option)
(4) Supply
(5) LED 1, Green: On/Off
(6) LED 2, Green: savE
(7) Supply
(8) LED 3, Red: Fault/optional chain brake
(9) LED 4, Green: Pivoting (option)
(10) Supply
Diagnosis and troubleshooting
M1
1 2 3 4 5 6
Fig.3
1 2 3 4 5 6 7 8 9 10
Fig.4
1
2
3
4
5
6
7
8
9
10
Fig.5
M
B-
B-
B+
SW 1
SW 2
SW 3
LED 1
LED 2
LED 3
LED 4
English 19
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