PROBLEM I. Chair or lift will not operate (continued).
PROBABLE CAUSE
TESTING PROCEDURE
CORRECTIVE ACTION
6. Loose connection 6. Using a voltmeter, check
6. Make a secure
in lift electrical
connection
junction box (figure
junction box for a reading of 115v or
3-3).
220v as applicable. If there is no
reading at chair receptacle on
electrical junction box, disconnect
chair power cord from connector at
front of lift. Check terminal 1 (lift
connector) for reading of 115v or
220v as applicable. If there is no
reading, remove lift motor cover and
check for loose connection in lift
electrical junction box.
7. Faulty wiring
7. Remove screws securing
7. Remove and replace
harness.
electrical junction box cover and
wiring harness.
check wiring for reading of 115v or
220v as applicable. If there is no
reading, wiring harness is faulty.
8. Assistant and
8a. Remove screws securing switch
8a. Remove and
Doctor's manual
bezel to chair and pull switch bezel
replace chair wiring
seat and back
out from the chair. Check for a
harness.
switches are faulty.
reading of 115v or 220v as
applicable between terminal 2 and
ground (figure 3-1). If there is no
reading, wiring harness is faulty.
8b. Check for a reading of 115v or
8b. Remove and replace
220v as applicable between terminal switch.
3 and neutral line when top side of
control switch is depressed; between
terminal 1 and neutral line (figure 2-
1) when bottom side of control switch
is depressed. If there is no reading,
switch is faulty.
8c. If there is a reading on both
8c. Remove and
switch legs in 8b above,
replace applicable
the motor is faulty.
motor.
MD0371
A-2