Can−Bus Terminator Resistors; Diode Assemblies - Toro Multi Pro 1750 Service Manual

CAN−bus Terminator Resistors
System communication between the Toro Electronic
Controller (TEC) and the InfoCenter display is accom-
plished on a CAN−bus communication system. Two (2)
specially designed, twisted cables form the bus for the
network used on the machine. These wires provide the
data pathways between machine components. At the
ends of the twisted pair of bus cables near the InfoCen-
ter display and the TEC are two (2) 120 ohm terminator
resistors.
The CAN−bus terminator resistors plug into the wire
harness in the control console. One of the terminator
resistors is under the switch panel on the control console
and the second resistor is located near the TEC and fuse
block. The wire harness connectors have a blue insert
to identify the proper location for the termination resist-
ors.
NOTE: Refer to the electrical schematic and wire har-
ness drawings in Chapter 10 − Electrical Drawings for
additional information on termination resistor location
and wire connections.

Diode Assemblies

If the machine is equipped with an optional foam marker
kit, a series of six (6) diodes are used to protect the cir-
cuit from voltage spikes when the foam pump is ener-
gized or de−energized. The diodes plug into the foam
marker wiring harness.
Diode Test
The diode (Fig. 81) can be individually tested using a
digital multimeter (diode test or ohms setting) and the
table provided. Replace diode if testing determines that
it is faulty.
Multimeter Multimeter
Red Lead (+) Black Lead (−)
on Terminal on Terminal
Female
Male Female
Multi Pro 1750
Continuity
Male YES
NO
Terminator
Resistor
IMPORTANT: The terminator resistors are required
for proper electrical system operation.
Termination Resistor Test
The terminator resistors (Fig. 80) can be tested using a
digital multimeter (ohms setting). There should be 120
ohms resistance between terminals A and B of the ter-
minator resistors. Terminal C is not used on Multi Pro
1750 machines. Replace resistor if testing determines
that it is faulty.
If the resistor tests correctly and a circuit problem still ex-
ists, check wire harness (see Electrical Schematic and
Wire Harness Drawings in Chapter 10 − Electrical Draw-
ings in this manual).
1
1. Diode
2. Male terminal
If the diode tests correctly and a circuit problem still ex-
ists, check wire harness (see Electrical Schematic and
Wire Harness Drawings in Chapter 10 − Electrical Draw-
ings in this manual).
Page 5 − 59
B
C
Figure 80
Figure 81
3. Female terminal
Electrical System
A
2
3