PROBLEM I. Chair or lift will not operate (continued).
PROBABLE CAUSE
TESTING PROCEDURE
CORRECTIVE ACTION
9. Broken chain or
9. If foot control is activated and
9. Replace chain.
sheared pin in
motor runs but lift does not raise,
motor sprocket.
failure is due to either a broken chair
Remove and replace pin
or pin on motor sprocket sheared.
on motor sprocket.
Visual inspection.
10. Bent or broken
10. Visual inspection.
10. Remove and
foot control switch.
replace foot control
switch.
11. Faulty motor or
11. If motor hums when foot control
11. Remove and
capacitor.
is used to operate lift, capacitor or
replace motor and/or
motor is faulty.
capacitor.
12a. Place in AUTO
12. Automatic
12a. Toggle switch on electrical
position.
control not
junction box should be in the AUTO
functioning.
position.
NOTE: If there is no action, check
AUTO/MANUAL mode
toggle switch as follows:
12b. Disconnect lift power cord from
supply receptacle.
12c. Using an ohmmeter, check
across terminals 1 and 3 on
S-1 for a reading of "0" ohms when
switch is in the AUTO position.
12d. Replace the
12d. If there is no movement of
AUTO/MANUAL
ohmmeter indicator, the
mode switch.
AUTO/MANUAL mode switch is
faulty.
MD0371
A-3
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