Service Manual: SC750, SC800, SC 750 ST, SC800 ST
Form Number 56043150 Page 42
J2 Connector
Pin # Circuit Descripon Value Comments
Used
on Non
ST or ST
1 Baery Negave (Ground) 0.5mV With vacuum motor running Both
2 Baery Negave (Ground) 0.5mV With vacuum motor running Both
3 Input from Brush Deck actua-
tor posion switch #0. Switch
oats open when actuator is
fully retracted (corresponding to
a raised deck), and is closed to
GND otherwise.
4.95V Up Posion. Other posions 0.5mV Both
4 Not used Both
5 Not used Both
6 Not used Both
7 Baery Negave (Ground) 0.5mV With vacuum motor running Both
8 Baery Negave (Ground) 0.5mV With vacuum motor running Both
9 Vacuum Motor Current Sense
input (voltage on this wire repre-
sents the motor current)
181 mV Vacuum motor running with solu-
on cover open. Dropped to 157 mV
when ball oat was seated.
Both
10 Brush Motor Current Sense input
(voltage on this wire represents
the motor current)
30mV Brushes free running – not contacng
oor
Both
11 Input from Brush Deck actuator
posion switch #1. Switch oats
open when actuator is parally
extended (corresponding to nor-
mal scrub pressure), and is closed
to GND otherwise.
4.96V Normal scrub posion. Other posi-
ons 0.5mV
Both
12 Pin has 2 funcons:
1) Input from Brush Deck actua-
tor posion switch #2. Switch
oats open when actuator is
fully extended (corresponding to
maximum scrub pressure), and is
closed to GND otherwise.
2) When an on-board baery
charger is installed and plugged
into an AC outlet, the input func-
on of this signal is overridden
and instead becomes a 1-wire,
bidireconal serial communica-
on line between the PC board
and the on-board charger
2.91V Extra scrub pressure posion. Other
posions 795mV.
If the Baery Charger is plugged in,
voltage pulses then seles in around
12V
Both
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