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 roughly 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.
