Model 4700 Maintenance Manual
Section 8. Theory of Operation
Single Traction Motor Trucks >S/N 10676 Item
Connection
Function Description
Theory of Operation
Pinout Matrix Normal Level
Signal Source
Signal User
298
J142-1
GND
Ground to the Horn switch (PB12) on the Armrest Board. If not present, check the switch, armrest board, wiring, and connections.
Approx. 5V
Armrest Board
PB12
299
J142-2
HORN
Input from the Horn switch (PB12) to the Armrest Board when pushed. If not present, check the switch, wiring, and connections.
Approx. 0V closed; 5V open
PB12
Armrest Board
300
J406-A
NOT USED
301
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
302
J406-C
C POT
Output from the Lifting/Lowering pot (P4) wiper to the Armrest Board. If not present, check P4, wiring, and connections. Note: Check P4 by disconnecting it from the circuit and reading across it. Approx. 4K ohms should be read across JSOLL-1 and 4.
Approx. 2.5V in neutral; range 0V to 5V
Lifting/ Lowering Fingertip Module
Armrest Board
303
J406-D
GND POT
Ground to the Lifting/Lowering pot (P4). If not present, check the Armrest Board, wiring, and connections.
Battery voltage wrt BT1+
Armrest Board
Lifting/ Lowering Fingertip Module
304
J406-E
MICRO
Input from Lifting/Lowering directional switch (SW17). If not present, check switch, wiring, and connections.
Approx. 5V closed; 0V open
Lifting/ Lowering Fingertip Module
Armrest Board
305
J406-F
MICRO
Input from Lifting/Lowering directional switch (SW18). If not present, check switch, wiring, and connections.
Approx. 5V closed; 0V open
Lifting/ Lowering Fingertip Module
Armrest Board
306
J406-G
GND
Ground to Lifting/Lowering directional switches (SW17 and SW18). If not present, check the Armrest Board, wiring, and connections.
Battery voltage wrt BT1+
Armrest Board
Lifting/ Lowering Fingertip Module
307
J407-A
NOT USED
308
J407-B
+V POT
Voltage to the Tilt pot (P5). If not present, check the Armrest Board, wiring, and connections.
Approx. 5V
Armrest Board
Tilt Fingertip Module
Publication 1160093, Issued: 20 May 2013
8-73
