Controller Lamps; Electrical Circuits - Jacobsen 67862 Parts & Maintenance Manual

5 TROUBLESHOOTING
5.2

CONTROLLER LAMPS _____________________________________________________

The controller is a solid state device that monitors and
controls electrical functions. The controller receives input
signals from various switches and sensors throughout the
machine and transmits output signals to operate relays,
solenoids and warning lights. It controls and resets timers
and contains built in logic to control certain machine
functions.
Each input and output signal is displayed through lamps
located on top of the controller. A closed input switch
Lamp On - Circuit is active
Lamp Off - Circuit is inactive
Lamp
3
Program active - indicates controller has power
4
Key Switch "Start" Post
5
Neutral Start Switch - Traction Pedal in Neutral
6 Brake Switch - Brake On
7
Seat Switch - Operator Seated
9
Cruise Control Switch - Off - Pin 1 (Option)
10
Cruise Control Switch - On - Pin 2 (Option)
11
Hydraulic Oil Level Float Switch
12
Hydraulic Oil Level Alarm Switch
13
Engine Oil Pressure Switch
16 Lift Limit Switch, Left Wing
19 Lift Limit Switch - Rightt Wing
20
Joystick - Left Mower- Pin 4
21
Joystick - Right Mower- Pin 5
22
Joystick - Lower- Pin 3
23
Joystick - Raise - Pin 2
25
Mow Switch Engaged- Pin 1
Inactive lamps - 1,2, 8, 14, 15, 17, 18, 24, 26, 27, 29, 30, 48 (not used)
5.3

ELECTRICAL CIRCUITS ____________________________________________________

When troubleshooting the machine using the controller
always check that lamp 3 is on. This lamp indicates that the
controller has power and the program is active.
Note: The controller requires a minimum of six volts to
operate.
Individual circuits can be tested by operating an input
switch, checking for the required input signal and looking for
a corresponding output. Keep in mind that not all switches
are located on the instrument panel. The traction pedal, lift
24
Controller Functions by Lamp Number
INPUTS
Circuit
indicates an active circuit and will turn an input lamp on, an
open switch indicates an inactive circuit and will turn a lamp
off. Outputs are active when their lights are on.
It is important to note that in some cases a lamp or group of
lamps must be on or off for a condition to be true. For
example, to start the tractor the Mow Switch must be off
(lamps 25, 37, 38 and 39 off) while the Neutral Start Switch
(lamp 5), Brake Switch (lamp 6) and Fuel Hold coil (lamp 34)
must be on.
OUTPUTS
Lamp
31 Glow Plug Relay & Indicator - Glow Plug On
32 Light Test
33 Start Relay and Indicator
34 Fuel Hold Coil
35 Warning Horn
36 Hydraulic Oil Level Light
37 Mow Switch - Left Wing Mower Active
38 Mow Switch - Center Mower Active
39 Mow Switch - Right Wing Mower Active
40 Cruise Control Valve / Light (Option)
41 Lift Valve - Pressure
42 Lift Valve - Raise Left Wing Mower
43 Lift Valve - Raise Center Mower
44 Lift Valve - Raise Right Wing Mower
45 Lift Valve - Lower Left Wing Mower
46 Lift Valve - Lower Center Mower
47 Lift Valve - Lower Right Wing Mower
limit and brakes are controlled by small proximity switches
mounted on the frame of the tractor.
If an input lamp does not light an inactive condition is
indicated. This could be caused by a fuse, faulty switch, a
switch that needs adjustment or poor connection.
The electrical connections to the solenoids on the hydraulic
valves are also equipped with small indicator lamps. When
lit these lamps indicate that the output signal has reached
the connection. If lamps do not come on, check wires to and
from connector.
Circuit