Nilfisk-Advance 56507009, Troubleshooting Manual

Page: 38 / 82

38 - FORM NO. 56043129 - SR 1900
SWEEPING SYSTEM
TROUBLESHOOTING GUIDE
Troubleshooting Guide
Symptom
Dust control (impellor) motor will not run in the wand state
Part A: Electrical Control Circuit
Note: Do all testing with the engine running at high speed and the dust control switch pressed
(activated).
Dust control motor will
not run
Press (activate) the dust
control switch
Does it’s indicator light
come ON ?
Check S9 coil resistance
Spec. 9 Ohms
See hydraulic dust control
motor troubleshooting
section B
Replace the S9
solenoid coil.
Replace the A2
control box assy.
Does the dust
control motor run ?
Ribbon pins test
open replace the
touch pad switch
panel
* Ribbon connector see Electrical System Figure 1 for detail pin call-outs
1. Back probe the S9
hopper solenoid coil
wires (+Vio &
Yel/Grn) should
read 12V’s
Back probe the S4
impellor motor solenoid
coil wires (+Vio &
Brn/Yel), should read
12V’s
Check S4 coil wiring
continuity, repair if
faulty
Is there 12V’s at the
S4 coil ?
Press & hold dust control SW.
Check for continuity @ the
ribbon connector (*) for pins
J3-1 & J3-10 on the A2 control
box.
No
Yes
No
No
No
Yes
Yes
Yes