Section 8.Theory of Operation

Pinout Matrix

101JPT12-11B+ B+ from PC1 present when the battery is plugged in. It is fused by FU2 and then used to supply anything labeled B+F.

102JPT12-12B+ B+ from PC1 present when the battery is plugged in. It is fused by FU2 and then used to supply anything labeled B+F.

103JPT12-612VPSupplies work ing voltage to the hour meter. If not present, check voltage at STM JPT9-6 and see if IL1 is lit.

Battery connected = B+ battery disconnected = 0V

Key switch closed = +10.9VDC

104JPT12-5HOUR METER ENABLE Path for the STM to su pply B- to the hour meter. Deadman closed= 12V Deadman Up= 0V

105JPT12-4DGNDBattery negative for the control circuitry on the steer power head. It comes from the STM.

Connection 1 on PC Contactor

STM

STMHour Meter

<0.5VDC wrt TP4 (B–) STM Steer Power Head

106JT1-1NC Not connected to any circuitry on the STM. NA NANA

107JT1-2TXD Connection for computer interface no usable measurements available. No useful voltages are measurable

108JT1-3RXD/PENDA NT1 Connection for computer interface no usable measurements available. No useful voltages are measurable

109JT1-4DTR/PENDA NT2 Connection for computer interface no usable measurements available. No useful voltages are measurable

110JT1-5DGNDB– supplied through the STM. <0.5VDC wrt TP4 (B–) STM Lift Lower Pendant

111JT1-6DSR Connection for computer interface no usable measurements available. No useful voltages are measurable

112JT1-7RTS/BOOTConnection for computer interface no usable measurements available. No useful voltages are measurable

113JT1-8NC Not connected to any circuitry on the STM. NA

114JT1-912VPSupplies working voltage to the lift lower pendant. If not present, check voltage at STM JPT9-6 and see if IL1 is lit.

STM Lift Lower Pendant

Publication Number: 1043922B, Revised: 2 Sept 2015