Control Board; Brush Motor Relay - Clarke CA30 20B Service Manual

Service Manual – Clarke CA30 20B and 17E

Control Board

Brush Motor relay

The control board is located between the
recovery and drain hoses behind the upper rear
cover of the machine. The brush motor relay is
attached to the control board enclosure. The two
procedures are interrelated.
1. Remove the Rear Covers (Control Cover)
described on page 26.
• Make sure to unplug the main battery
disconnect during the procedure.
2. Remove the 4 screws (B) that secure the
control board enclosure to the machine.
3. Carefully move the control board away from the machine enough
to reach the electrical connections on the back side. Remove the
following connectors:
• Main power negative/ground (D)
• Main power positive (F)
• Vacuum motor positive (E)
• Solution solenoid (G)
• Operator switches (H)
• Brush motor relay coil (I)
• Battery level LED board (J)
Control System (Battery Model)
B
C
A
B
C+
C-
S4
H
S3
S2
COM
Sol
Relay
SOLUTION
G
VCC
I J
C+ = Com = Common
C- = Scrub SW
S4 = Vacuum SW
S3 = Solution SW
S2 = Machine Enable (Charger)
COM = C+ = Common
Vac
Relay
Vac
GND
Motor
F E D
28