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PROBLEM #2
2. Manual control switch for lift fails to raise or lower the chair.
TESTING PROCEDURE
CORRECTIVE ACTION
PROBABLE CAUSE
1. Broken chain.
1.
Visible
1. Replace broken.
inspection.
2. Sheared pin
2.
Visible
2. Replace motor.
on motor
inspection.
sprocket.
3. Faulty switch
3a.
Remove switch
or wiring
bezel from chair.
harness.
3b.
3b.
Replace wiring
to check for
harness.
reading of 115v
or 220v as
applicable
between terminal
2 and neutral
line. If there is
no reading, the
wiring harness is
faulty.
3c.
If there is a
3c.
Replace
reading in 3b above,
switch.
check for a reading
of 115v or 220v as
applicable between
terminal 3 and neutral
ine when top side of
control switch is depressed;
between terminal 1 and
neutral when bottom side
of switch is depressed. If
there is no reading, the
switch is faulty.
MD0373
A-13