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Test
the switch for continuity
using a multitester.
Set the multitester to the ohms setting X1. Place a probe
on each terminal. The multitester should give a reading of
infinity when the probes touch the terminals. With the probes
still touching the terminals, depress the switch, the reading
should change from infinity to zero. If it does not pass both
of these tests, the switch should be replaced.
If there are four terminals, touch
the probe to one terminal and then
test each of the other three terminals
with the other probe one at a time.
With the button depressed touching
one of the three terminals should
cause the multitester reading to
change from infinity to zero. Those
two terminals are a pair. Release
the switch with the probes still
touching the terminals and the reading
should change back to infinity.
Now test the other two terminals.
If either pair of terminals fails
the continuity test, the switch
should be replaced.
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