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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 change from a reading
of infinity to zero when the probes touch the terminals. With
the probes still touching the terminals depress the switch,
the reading should change back to infinity. 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. Touching one of the three
terminals should cause the multitester reading to change from
infinity to zero. Those two terminals are a pair. Depress
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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