Control System
49
Service Manual – SC6500
™
Display
Code
Error/Fault Description
Correction
19
Back-up alarm overload
Specifications:
• 5-15 VDC
• Current load 100 ma
1. Check for a back-up alarm wiring problem or short
circuit* (wire colors: positive ORN/BRN; negative
BLU/WHT).
2. Disconnect the back-up alarm and test to see if the
wiring is shorted. If not, replace the back-up alarm.
20
Horn output fault
Current load spec. 1.2 amps
1. The horn or horn wiring’s +36V power feed is shorted
to ground (wire colors VIO and BLU/RED).
2. Disconnect the horn and test to see if the wiring is
shorted. If not, replace the horn.
21
Scrub motor open
1. Check for an open circuit in the motor wiring or for a
defective motor.
2. Check for 36 volts at the scrub motor that is not
running. If you get 0 Volts, replace the brush motor
contactor.
22
Left brush motor contactor coil open
1. Check for an open circuit in the
K4
coil and wiring
(wire colors VIO and GRA/RED).
2. Test for 36V at the
K4
coil. If you get 0 Volts, check
the A2 control board assembly.
23
Left brush motor contactor coil short
to ground
1. Disconnect the
K4
coil wiring (wire colors VIO and
GRA/RED) and check to see if the code disappears.
−
If the code disappears, replace the brush contactor.
−
If the code does reappear, test the wiring for a short
back to the battery ground. Repair or replace the
defective wire.
2.
If the above test doesn’t remove the code, substitute
a new A2 control board assembly.
24
Center brush motor contactor coil
open
1. Check for an open circuit in the
K3
coil and wiring
(wire colors VIO and WHT/VIO).
2. Test for 36V at the
K3
coil. If you get 0 Volts, check
the A2 control board assembly.
25
Center brush motor contactor coil
short to ground
1. Disconnect the
K3
coil wiring (wire colors VIO and
WHT/VIO) and check to see if the code disappears.
−
If the code disappears, replace the brush contactor.
−
If the code does reappear, test the wiring for a short
back to the battery ground. Repair or replace the
defective wire.
2.
If the above test doesn’t remove the code, substitute
a new A2 control board assembly.
26
Right brush motor contactor coil
open
1. Check for an open circuit in the
K2
coil and wiring
(wire colors VIO and YEL/BLU).
2. Test for 36V at the
K2
coil. If you get 0 Volts, check
the A2 control board assembly.
