c. If the automatic control fails to operate the chair and the manual controls are
operating, two probable causes are listed in the troubleshooting guide in the appendix.
(1) The automatic control switch is faulty. To test this, you test the
automatic control switch using the procedures shown under probable cause number 14
for the chair not lifting, "automatic controls are not functioning." If any of the 14 testing
procedures prove positive, you use the corresponding corrective action to fix the
malfunction. Refer to figure 2-1, Control Board portion.
(2) The automatic control board is faulty. To test this, you test the automatic
control board as shown under probable cause number 7, "faulty solid state automatic
control board." If the test proves positive, remove and replace the automatic control
If you cannot take the corrective action immediately, you place the junction
box toggle switch in the manual position until you can take the corrective