Laguna Tools MTST5S-0135, Operating Manual

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7. TROUBLESHOOTING
32
WARNING-Disconnect the machine from the power source before troubleshooting or serious personal injury
could occur.
Problem Possible cause Troubleshooting
The machine cannot be
switched on.
1. Door in machine frame or saw
blades cover plate is opened.
2. Control circuit fuses defective.
1. Close the machine door or cover plate.
2. Turn the main switch off, then open the switch
cabinet and identify which of the fuses is
defective and remove it. Replace new fuses, only
using fuses of the same rating!
The machine switches off
automatically during
operation.
1. Power failure in one or several
phases due to responding
factory fuses.
2. Overload protection has
responded due to blunt saw or
excessive feed speed.
3. Control circuit fuses defective.
1. Eliminate cause of phase failure.
2. Change saw blade or reduce feed speed. Allow
motor to cool down.
3. Turn off the main switch, open the switch
cabinet and identify which of the fuses is
defective and remove it. Replace new fuses, only
using fuses of the same rating!
Motor will not start, or it
growls on start up.
1. Emergency stop button is
pressed.
2. Power supply fuse or circuit
breaker has tripped.
3. Thermal overload has tripped.
4. Toggle switch is broken inside.
5. Start capacitor is at fault.
6. Motor fan cover is dented,
stopping the fan from being able
to spin.
7. Motor is at fault.
1. Adjust the button clockwise to make it pop
out.
2. Disconnect power, and inspect circuit for
electrical shorts and repair. Replace circuit
breaker if it is old or has tripped many times.
3. Reset the thermal overload.
4. Disconnect power, and use an ohmmeter to
check switch terminals for continuity, and
replace switch if required.
5. Replace start capacitor.
6. Replace motor fan cover (and fan, if damaged).
7. Replace motor.
Motor overheats. 1. Motor thermal protector
rejected
2. Air circulation through the
motor restricted.
1. Wait for the motor temperature cold down;
then motor thermal protector will re-set
automatically
2. Clean out motor to provide normal air
circulation.