Model 4700 Maintenance Manual
Section 8. Theory of Operation
All Dual Traction Motor Trucks and Single Traction Motor Trucks <S/N 10677 Item
Connection
Function Description
Theory of Operation
Normal Level
Pinout Matrix Signal Source
Signal User
351
J138-1
GND
B– supply from Battery. This B– is used by the optional Fingertip Armrest Board. If not present, follow back towards B– until loss can be determined.
Battery voltage wrt BT1+
BT1
Fingertip Armrest Board
352
J138-2
CAN L
Communication line between PPA and optional Fingertip Armrest Board (JCAN-2).
N/A
PPA
Fingertip Armrest Board
353
J138-3
GND
B– supply from Battery. This B– is used by the optional Fingertip Armrest Board. If not present, follow back towards B– until loss can be determined.
Battery voltage wrt BT1+
BT1
Fingertip Armrest Board
354
J138-4
CAN H
Communication line between PPA and optional Fingertip Armrest Board (JCAN-4).
N/A
PPA
Fingertip Armrest Board
355
J138-5
+24V CAN
+24V supply to Fingertip Armrest Board (JCAN-5) from VM (J34-12). If not present, check fuse F23, wiring, and connections.
+24V
VM
Fingertip Armrest Board
356
J138-6 and 7
NOT USED
357
J140-1
B+
B+ to HCB. If voltage is not present, check fuse F3, wiring, and connections.
B+
F3
HCB
358
J140-2
B+
B+ to HCB. If voltage is not present, check fuse F3, wiring, and connections.
B+
F3
HCB
359
J140-3
B–
B– supply from Battery. This B– is used by the optional HCB. If not present, follow back towards B– until loss can be determined.
Battery voltage wrt BT1+
BT1
HCB
360
J140-4
CAN L
Communication line between HCB and VM (J40-8).
N/A
VM
HCB
361
J140-5 thru 12
NOT USED
362
J140-13
CAN H
Communication line between HCB and VM (J40-15).
N/A
VM
HCB
363
J140-14
NOT USED
364
J406-A
NOT USED
365
J406-B
+V POT
Voltage to the Lifting/Lowering pot (P4). If not present, check the Armrest Board, wiring, and connections.
Approx. 5V
Armrest Board
Lifting/ Lowering Fingertip Module
Publication 1160093, Issued: 20 May 2013
8-43
