R.P.S. Corporation MAGNUM series, Service Manual

Page: 90 / 134

Magnum Service Manual V1.0
13
13-12
COMPUTER CONTROL SYSTEM
“BRUSH SWITCH”
does not work.
Operate machine
and verify the
customers
complaint.
Does the switch
work properly?
Instruct owner on
proper machine
operation
YES
Is the One
Touch Switch
Off?
The One Touch switch is the
large green button right
below the water knob. When
it is depressed it is on.
NO
Turn off the one
touch switch
Using a voltmeter set the meter
to DC volts. Connect the ( -)
probe of the meter to the ( - )
buss bar with a clip on your
meter probe. Measure at the
center tab of the squeegee
switch. (green wire)
Is there between
0.8 and 2.8 volts?
Place the ( + ) probe
back on the center
terminal of the switch.
(blue wire) Turn the
switch on and measure
the voltage.
YES
At the 20 pin Molex connector
at the controller, back probe
pin #11 with the positive probe
of the meter.
Is there
between 0.8 and
2.8 volts?
Replace the
controller
NO
YES
Repair open circuit between pin #11
on the controller and center terminal
of the brush pressure the switch.
Place your meters ( + )
probe on the lower
terminal of the switch.
red wires) Measure the
voltage
Is the voltage
between 4.8 and 5.2
volts?
NO
At the 20 pin Molex connector
at the controller, back probe
pin #11 with the positive probe
of the meter.
Is there
between 4.8 and
5.2 volts?
Repair open circuit
to switch
NO
YES
NO
MAGNUM BRUSH SWITCH DIAGNOSTIC FLOW CHART
1 of 2
Turn on the scrub deck switch and then
drive the machine. Observe the LCD
display and see if the brush icon appears.
Repeat this with the one touch switch.
Did the icon
turn on?
Go to the BRUSH
MOTOR section
YES
NO
GO TO
PAGE 2
“A”
GO TO
PAGE 2
“B”