14
12.0
Troubleshooting JSG‐233A‐M Sander
Before any repair or maintenance work, the machine must be switched off and disconnected from
the power supply (pull the plug). Failure to comply can result in serious injury.
Symptom
Possible Cause
Correction *
Motor won´t start when
switch is activated
No incoming current.
Check connections and fuse.
Low voltage.
Check power line for proper voltage.
ON/OFF switch defective.
Have the machine repaired at an authorized
repair shop.
Capacitor defective.
Motor defective.
Machine does not reach
full speed
Overload.
Apply less pressure, use coarser grit.
V‐belt loose.
Tension the V‐belt (see chapter 10.3).
Motor overheat.
Air circulation through motor restricted.
Clean motor fan with compressed air to restore
normal air circulation.
Motor overloaded.
Apply less pressure, use coarser grit.
Loud, repetitive noise or
vibration coming from
machine.
Fasteners loose.
Inspect fasteners and tighten where needed.
Motor fan is hitting cover.
Tighten fan or shim fan cover.
Machine not level.
Place sander on flat surface, shim if needed.
Sanding paper slips
Sanding belt is stretched.
Install new sanding belt.
Too much applied pressure.
Apply less pressure, move workpiece while
sanding.
Sanding belt does not run
in the middle of the rollers
Sanding belt defective.
Replace the sanding belt.
Belt tracking adjusted off center
Align the sanding belt using the adjusting knob
(pos. 26) until it runs exactly in the track.
Sanding belt tears
Sanding belt installed wrong way.
Observe the belt running direction.
Abrasive loads up
prematurely.
Too much applied pressure.
Move workpiece while sanding.
Inadequate dust collection.
Increase airflow at dust port.
Inadequate abrasive.
Use an open‐coat abrasive.
Sanding marks on the
wood.
Workpiece was held still.
Keep the workpiece moving.
Sander burns wood.
Abrasive is loaded.
Clean abrasive or replace abrasive.
Excessive stock removal for fine grit.
Use coarser grit
Abrasive is worn.
Replace abrasive.
*
WARNING:
Some corrections may require a qualified electrician.
Table 3