g. Reconnect the external power source.
h. Depress each switch and operate the chair and the base motors through their
REPLACING BASE MOTOR (PLR-200)
The lift motor hums when you use the foot control switch to raise or lower the
chair, or the doctor's automatic switch to lower the chair. You have isolated the
malfunction to a faulty base motor. You must remove and replace it. There are
different procedures for the chair in the UP position and DOWN position. If you can
raise the chair with the foot control switch to the "UP" position, use procedure a. If the
chair is in the "DOWN" position and you cannot raise it, use procedure b.
a. Chair Is in "UP" Position. Refer to figure 3-2.
Figure 3-2. View of bellows with chair raised.