SC 750 ST User Manual

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Service Manual: SC750, SC800, SC 750 ST, SC800 ST

Form Number 56043150 Page 51

Specifications

Shop Measurements – Main Machine Controller

The following tables contain some “real world” shop voltage measurements to help you recognize what “normal” looks

like. All voltage values were measured with the black (Negave) voltmeter lead connected to the main baery negave

terminal unless otherwise specied. (Non ST = SC750 and SC800 models. ST = SC750 ST and SC800 ST models)

J1 Connector

Pin # Circuit Descripon Value Comments

Used

on Non

ST or ST

1 Chemical Pump “+” output Non ST

2 Not used Both

3 Chemical Pump “-“ output Non ST

4 Brush Head Actuator motor “+” output 24v

down

-24v up

With red lead at pin #4 and black

lead at pin #5

Both

5 Brush Head Actuator motor “-“ output Both

6 Not used Both

7 Not used Both

8 Baery Negave (Ground) 0.5mV With vacuum motor running Both

9 Not used Both

10 Not used Both

J2 Connector

Pin # Circuit Descripon Value Comments

Used

on Non

ST or ST

1 Baery Negave (Ground) 0.5mV With vacuum motor running Both

2 Baery Negave (Ground) 0.5mV With vacuum motor running Both

3 Input from Brush Deck actuator posion switch

#0. Switch oats open when actuator is fully

retracted (corresponding to a raised deck), and

is closed to GND otherwise.

4.95V Up Posion. Other posions 0.5mV Both

4 Not used Both

5 Not used Both

6 Not used Both

7 Baery Negave (Ground) 0.5mV With vacuum motor running Both

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Nilfisk SC 750 ST Heavy-Duty Cleaning