Control System 19Service Manual – SC2000
Control System
Functional Description
The architecture of the electronic control system for
the machine’s electrical components is composed of
a function electronic board (EB1) and a display elec-
tronic board (EB2), in turn connected to a dashboard
instrument electronic board (EB4) which represents
the main user interface.
The function electronic board (EB1) manages all com-
ponents and drives the following components directly:
- Brush motor (M1)
- Vacuum system motor (M2)
- Drive system motor (M3)
- Detergent pump (M4)
- Deck actuator (M5)
- Squeegee actuator (M6)
- Solution ow solenoid valve (EV1)
- Electromagnetic brake (BRK)
The display electronic board (EB2) serves mainly
as an aggregator for all input signals (buttons) and
outputs (LEDs) from the dashboard instrument elec-
tronic board (EB4), which it is connected to via 2 at
cables.
Mounted on the key electronic board (EB3) there are
2 sensors which detect the presence and type of mag-
netic key inserted in relevant slot on the steering col-
umn. The information about the inserted key is sent
from the key electronic board (EB3) to the function
electronic board (EB1).
The display electronic board (EB2) sends all the in-
put signals from the Dashboard instrument electronic
board (EB4) to the function electronic board (EB1) us-
ing 2-wire 2-way serial communications protocol.
The system is completed by the on-board battery
charger which also uses a proprietary serial protocol
to communicate with the function electronic board
(EB1), in order to display its operating status (charg-
ing phase) to the operator on the LCD display.
Wiring Diagram
J3
J2
FCI DUFLEX (2.54 pitch) 8-way, male pins
FCI DUFLEX (2.54 pitch) 9-way, male pins
Dashboard power supply +
Dashboard serial +
Dashboard serial -
Dashboard power supply -
Return from key J1.5
J1.1
J1.2
J1.3 (+5V)
J1.4
J1.5
J1.6
J1.7
J1.8
J1.9
J1.12
B+
B -
Electronic board power supply +
Electronic board power supply -
Key electronic board power supply +
Return from USER key
SERVICE key circuit power supply
Return from SERVICE key
External power supplies -
Display electronic board power supply +
Enabling input from display electronic board
Display electronic board serial +
Display electronic board serial -
Return from steering microswitch
J1.1
J1.2
J1.3
J1.4
J1.5
J1.4
J1.3
J1.2
J1.1
Microprocessor
DASHBOARD
INSTRUMENT
ELECTRONIC
BOARD (EB4)
FUNCTION ELECTRONIC
BOARD (EB1)
SIGNAL CIRCUIT
FUSE (F2)
DISPLAY ELECTRONIC BOARD (EB2)
KEY ELECTRONIC BOARD (EB3)
ANTI-SKID
CONTROL
SENSOR (SW4)
Figure 1
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