Nilfisk SC750 Heavy-Duty Cleaning

Some outputs (like the scrub brush motors) are only turned on when other condions are met, such as when the ma-

chine is moving. It can be dicult to check for voltage to the scrub brush motors while the machine is moving. Also, if

voltage is not present, it leaves in queson what other condions may not have been met yet. The Service Test Mode

solves these problems for the technician. In Service Test Mode the technician can request that the Main Machine Con-

troller ignore all other condions and directly turn on the scrub brush motors as well as other outputs. Service Test

mode can also be used to verify that certain inputs are seen by the controller. The concept is the same for all models

but the procedure is very dierent depending on whether you are working on an” ST” model (control panel with rocker

switches – SC750 ST and SC800 ST) or a “non-ST” model (control panel with membrane switches – SC750 and SC800).

See appropriate secons below.

To enter the service test mode: (Start with the baery charger unplugged and the key o)

for the actuator to move. Press the Scrub Switch backward to move the actuator up one posion. The Scrub Indicator

LEDs indicate the current actuator posion. Neither LED is ON when deck is raised, lower LED is ON when deck is at

low scrub pressure, both are on for high pressure. Machines with disc scrub decks have three posions while cylindrical

decks have only two. Note: If the switch inputs are not reporng correct informaon, the controller will not understand

the current actuator posion and will not aempt to move the actuator.

indicator will be on while in the test mode. Listen for the Solenoid to click on and o. Press the Soluon Switch forward

again to stop cycling the solenoid.