Diode Assemblies; Below 240000000) - Toro 30821 Service Manual

Diode Assemblies

The diodes D1, D2, and D4 provide logic for the interlock
switches. Diode D3 is used for circuit protection from in-
ductive voltage spikes when the interlock relay is de- en-
ergized. Two types of diodes have been used on the
Groundsmaster 3500- D:
1. On early production machines, the diodes are lo-
cated within the main wiring harness that lies under the
hydraulic tank and control console (Fig. 13).
2. Later production machines use diodes that plug into
the wiring harness (Fig. 14). Location of the diodes is un-
der the control console.
NOTE: Machines equipped with the standard control
module (serial numbers above 240000000) use only
one diode.
Testing
The diodes can be individually tested using a digital
multimeter (diode test or ohms setting) and the tables
below.
1. Diodes located within the main harness (Fig. 13):
Multimeter Multimeter
Red Lead (+) Black Lead (- )
on
Terminal Blade Terminal Blade
Male Female
Female
2. Plug- in style diodes (Fig. 14):
Multimeter Multimeter
Red Lead (+) Black Lead (- )
on Terminal on Terminal
Female
Male Female
Electrical System (Rev. G)
Continuity
on
YES
Male NO
Continuity
Male YES
NO
2
4
1. Diode
2. Male terminal blade
1
1. Diode
2. Male terminal
Page 5 - 12
1
Figure 13
3. Female terminal blade
4. Clear PVC tubing
2
3
Figure 14
3. Female terminal
Groundsmaster 3500- D
3