Diode Circuit Board
The diode circuit board contains four diodes (Fig. 40)
and is located under the console housing. Diode D1--A
provide logic for the interlock switches. Diodes D1--C,
D1--B (GM 4700--D right deck), and D1--D (GM 4700--D
left deck) are used for circuit protection from voltage
spikes when PTO relays are de--energized.
H
G
F
D1--D
D1--A
D1--C
D1--B
E
Diode Circuit Board Test
D
C
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.
B
A
CIRCUIT BOARD
DIODE DIAGRAM
Figure 40
Red Lead (+)
on
Terminal
Black Lead (--)
on
Terminal
Continuity
H
A
G
B
F
A
H
B
G
C
F
YES
NO
YES
NO
YES
NO
C
E
D
D
E
YES
NO
Groundsmaster 4500--D/4700--D
Page 5 -- 25
Electrical System (Rev. A)
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| Language | English |
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