Model 4700 Maintenance Manual

Section 8.Theory of Operation

All Dual Traction Motor Trucks and Single Traction Motor Trucks <S/N10677Pinout Matrix

129J8-1 GND Ground to Horn push button switch (PB4) from VM (J34-6). If not present, check VM, wiring, and connections.

130J8-2 HORN INHorn push button (PB4) input to VM (J34-16). If not present, check switch, wiring, and connections.

131J8-3 and 4NOT USED

132J11– HR 1 GNDB– to the Horn (HR1). If not present, check wiring and connections.

133J11 IN HORN OUTControl voltage to Horn (HR1) from the VM (J34-9). If not present, check VM, switch, wiring, and connections.

134J11+ +24V +24V to the Horn (HR1) from the DC/DC Converter. If not present, check fuse F6, wiring, and connections. Approx. 65ohms across coil (J11+ to J11–).

135J13-1 +12V +12V to the Pump Motor (PM) encoder (EN3). If not present, check the PPA, wiring, and connections.

136J13-2 GND Ground to the Pump Motor (PM) encoder (EN3). If not present, check the PPA, wiring, and connections.

137J13-3 PM ENCODER CHANNEL A Channel A from the Pump Motor (PM) encoder (EN3). If not present, check voltage to the encoder, wiring, and connections.

Battery voltage wrt BT1+

Approx. 5V open; 0V closed PB4VM

Battery voltage wrt BT1+

+24V normal goes to 0V when horn button depressed

+24V DC/DC Converter Horn

139J13-5 TERM

Publication 1160093, Issued: 20 May 2013

Battery voltage wrt BT1+

Approx. 5V running; 0V or 10V static

Approx. 5V running; 0V or 10V static

Battery voltage wrt BT1+

Battery voltage wrt BT1+

Section 8.Theory of Operation

Model 4700 Maintenance Manual

Pinout MatrixAll Dual Traction Motor Trucks and Single Traction Motor Trucks <S/N10677

141J13-6 PM TEMP

Dual Traction Motor TruckInput to the PPA (JFP-6) from the Pump Motor (PM) temperature switch (TS3). Input will be low under normal operating conditions. If overtemp condition exists [>266°F (130°C)], input will be high. Allow to cool. If still open (high), check switch, wiring, and connections.

Approx. 0V closed; 9V open

TS3PPA

142J13-6 PM TEMP

Single Traction Motor TruckInput to the VM (J34-26) from the Pump Motor (PM) temperature switch (TS2). Input will be low under normal operating conditions. If overtemp condition exists [>266°F (130°C)], input will be high. Allow to cool. If still open (high), check switch, wiring, and connections.

Approx. 0V closed; 9V open

TS2PPA

143J13-7 thru 9NOT USED

144J14-A C POT Input from the Steer pot (P1) to the TPA (JCT-17). If not present, check the Steer pot (P1), wiring, and connections.

145J14-B GND POTGround from the TPA (JCT-15) to the Steer pot (P1). If not present, check the TPA, wiring, and connections.

146J14-C +V POT+12V from the TPA (JCT-16) to the Steer pot (P1). If not present, check the TPA, wiring, and connections. Approx. 1.8K ohms across pot J14-B to J14-C.

147J15-1 +12V Dual Traction Motor Truck+12V to the Right Traction Motor (RTM) encoder (EN1) from the TPA (JCT-1). If not present, check the TPA, wiring, and connections.

148J15-1 +12V Single Traction Motor Truck+12V to the Traction Motor (TM) encoder (EN1) from the TPA (JT6-1). If not present, check the TPA, wiring, and connections.

149J15-2 GND Dual Traction Motor TruckGround to the Right Traction Motor (RTM) encoder (EN1) from the TPA (JCT-2). If not present, check the TPA, wiring, and connections.

Approx. 1.5V steered left; 5.5V centered; 10V steered right

Battery voltage wrt BT1+

Battery voltage wrt BT1+

Publication 1160093, Issued: 20 May 2013