Section 9. Theory of Operation

motor stops rotating. That information is usable measurements available.

Battery negative for the control circuitry on the steer power head. It comes from the STM.

Not connected to any circuitry on the STM.

Connection for computer interface no usable measurements available.

Connection for computer interface no usable measurements available.

Connection for computer interface no usable measurements available.

Not connected to any circuitry on the STM.

Supplies working voltage to the lift lower pendant. If not present, check voltage at STM JPT9-6and see if IL1 is lit.

Supplies working voltage to the 120/150 in. switch. If not present, check voltage at STM JPT9-6and see if IL1 is lit.

Supplies B- to circuitry on the STM when the switch is closed. When the switch is open the truck will have limited travel speed.

B- for S29, supplied through the STM via B- cable at the TPA.

Supplies working voltage to the1 80 in. switch. If not present, check voltage at STM JPT9-6and see if IL1 is lit.

Supplies B- to circuitry on the STM when the switch is closed. When the switch is open the truck will have limited travel speed.

B- for S25, supplied through the STM via B- cable at the TPA.

Supplies working voltage to the Lift Limit Switch (S24). If not present, check voltage at STM JPT9-6 and see if IL1 is lit.

Supplies B- to circuitry on the STM when the switch is closed. When the switch is open the truck will have no lift unless the bypass switch (S5 1) is closed.

B-

S24, supplied through the STM via B- cable at the TPA.