Model 4700 Maintenance Manual

Section 8.Theory of Operation

Single Traction Motor Trucks >S/N 10676 Pinout Matrix

321J409-A NOT USED

322J409-B +V POTVoltage to the 4th Aux pot (P7). If not present, check the Armrest Board, wiring, and connections. Note: This switch is internal to the Fingertip Module. If switch is bad, replace the module.

323J409-C C POT closed; 0V open 4th Aux Fingertip Module

Output from the 4th Aux pot (P7) wiper to the Armrest Board. If not present, check P7, wiring, and connections.

Note: Check P7 by disconnecting it from the circuit and reading across it. Approx. 4K ohms should be read across JIV-1 and 4.

324J409-D GND POTGround to the 4th Aux pot (P7). If not present, check the Armrest Board, wiring, and connections.

325J409-E MICROInput from 4th Aux pot (P7) directional switch (SW23). If not present, check switch, wiring, and connections.

326J409-F MICROInput from 4th Aux pot (P7) directional switch (SW24). If not present, check switch, wiring, and connections.

327J409-G GND Ground to 4th Aux pot (P7) directional switches (SW23 and SW24). If not present, check the Armrest Board, wiring, and connections.

328PPA B+ B+ B+ from the battery to the PPA through fuse FP. If not present, make sure the battery is connected. Check fuse, wiring, and connections.

Approx. 5V closed; 0V open

Aux Fingertip Module

Armrest Board

Armrest Board

Battery voltage wrt BT1+ Armrest Board 4th Aux Fingertip Module

Battery voltage wrt BT1+

PPAPM Item Connection Function Description Theory of Operation Normal Level Signal Source Signal User

330PPA (U) PPA (U)One of three phases from the PPA to the Pump Motor. Voltage is measured between any two phases. If not present, check the PPA, wiring, and connections.

Publication 1160093, Issued: 20 May 2013