caution - Toro

Diode Circuit Board
The diode circuit board (Fig. 50) contains four (4) diodes
and is located under the console housing. Diode D1--A
provides logic for the interlock system. Diodes D1--B
(right wing deck), D1--C (front deck) and D1--D (left wing
deck) provide latching circuits for the PTO relay.
D1--A
D1--D
H
G
F
Testing
The diodes can be individually tested using a digital
multimeter (ohms setting) and the table to the right. If
any of the diodes are damaged, the diode circuit board
must be replaced.
Apply dielectric grease (Toro part number 107--0342) to
circuit board contacts whenever the circuit board is
installed into the wire harness.
D1--C
D1--B
D1--A
D1--B
D1--C
D1--D
CIRCUIT BOARD
DIODE DIAGRAM
Figure 50
E
D
C
B
A
Red Lead (+)
on
Terminal
Black Lead ( -)
on
Terminal
Continuity
H A YES
A H NO
G B YES
B G NO
F C YES
C F NO
E D YES
D E NO
Electrical System
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Groundsmaster 4100--D