g. Reconnect the external power source.
h. Depress each switch and operate the chair and the base motors through their
REMOVE AND REPLACE A FAULTY SOLID STATE CONTROL BOARD.
The chair will not raise or lower. You have isolated the malfunction to a faulty
solid state control board. You must remove and replace it. Refer to figure 3-2.
Figure 3-2. Automatic control board.
a. Disconnect the chair power cord from the building power supply.
b. Remove the chair plastic toe cover by removing the staples and securing the
tails of the cover to the under side of the wood seat frame. Slip the cover off of the
c. Remove the eleven Phillips head screws that attach the toe board cover to
d. Disconnect the cords from the control board by depressing the locking arms
on the connectors with your thumb and the forefinger.
Handle the automatic control board carefully. Never flex it.