9
NORSE Operating Manual & Parts List 9681310 & 9681311
9
TROUBLESHOOTING GUIDE
Symptom
Possible Cause(s)
Corrective Action
Disc sander will not start or
restart. Machine trips circuit
breakers or blows fuses.
Disc sander is connected to an
inappropriate power source.
Confirm disc sander is connected to power and source
appropriate for the machine.
Blown fuse or tripped circuit breaker
Replace blown fuse; reset circuit breaker.
Cord damaged.
Replace damaged cord.
Extension cord too light or too long.
Replace extension cord with one of adequate size for
its length.
Building fuse blows or circuit breaker
trips.
Confirm the building’s circuitry is large enough to
accommodate the disc sander. Check for a loose
electrical lead if circuitry is large enough.
Electrical connections loose.
Check all electrical connections on the disc sander
including the motor connections. Confirm each
connection is tight. Visually check for signs of
electrical arcing which indicates loose connections or
circuit overload.
Switch or motor failure (troubleshooting
between the two).
Use a voltmeter to determine if the issue is a switch
or motor failure. First, verify that the incoming voltage
reads according to the rated voltage, and second,
check the voltage between switch and motor. This
voltage should also read according to rated voltage.
If incoming voltage is incorrect, the issue is power
supply problem. If voltage between switch and motor
is incorrect, the issue is a switch problem. If voltage
between switch and motor is correct, your issue is a
motor problem.
Motor failure.
If the electrical supply and switch show correct
voltage, the motor is probably the issue. Have a
qualified electrician test the motor for function.
Replace motor as needed.
On/Off switch failure.
Have a qualified electrician test the switch to ensure
it is functioning properly. Replace switch as needed
Disc does not come up to full
speed.
Extension cord too light or too long.
Replace extension cord with one of adequate size for
its length.
Low voltage being supplied to the
machine.
Have a qualified electrician address the issue.
Excessive sanding friction or feed
pressure is too great.
Do not force the workpiece into sanding disc. Allow
the disc to cut freely.
Excessive replacement of
sanding paper.
Excessive pressure being used during
sanding operations.
Do not force the workpiece into sanding disc. Allow
the disc to cut freely.
Not using full width of disc.
Stroke across the full width of the sanding disc.
Machine vibrates excessively.
Sander base not level with floor.
Level the machine using the supplied anti-vibration
feet.
Motor loose or improper motor
mounting.
Check and adjust motor mounting. Confirm all motor
mounting bolts are tight.
Sanding marks on workpiece.
Sanding disc is too coarse based on
the material being sanded.
Use proper grit disc. Coarser grits remove stock
quicker and leave a rougher finish. Finer grits show
less marks and are used for finishing work.
Workpiece sanded across grain.
When surface sanding, use fine sanding disc paper
then finish by hand, working in direction of grain.
Sanding granules quickly rub
off the sanding disc.
The sanding disc has lost its original
properties or is defective.
Never store sanding discs in extremely dry or high-
temperature areas which can damage the glue holding
the granules. Never fold sanding discs, store them flat.
