Toro 4100-D service manual Diode Circuit Board

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.

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.

					H
D1--D					G
D1--A					F
D1--C					E
D1--B	D1--A	D1--B	D1--C	D1--D	D
					C
					B
CIRCUIT BOARD					A
		DIODE DIAGRAM
	Figure 50
Red Lead (+)	Black Lead (--)			Continuity
on	on
Terminal	Terminal
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 Page 5 -- 32 Groundsmaster 4100--D