21
12.0 Troubleshooting JMS-10X,12X Miter Saws
Symptom Possible Cause Correction *
Motor will not start No incoming power. Check plug connection to receptacle. If
satisfactory, check electrical panel for
blown fuse or tripped breaker – replace
fuse or reset breaker.
Low voltage. Correct the low voltage conditions.
Faulty power cord or plug. Have cord and plug inspected by a qualified
service center.
Open circuit in motor or loose
connection.
Have motor inspected by a qualified service
center.
Motor will not start:
fuse blows or circuit
breaker trips.
Short circuit in line cord or plug. Inspect cord or plug for damaged insulation
and shorted wires.
Open circuit in motor or loose
connection.
Have motor inspected by a qualified service
center.
Incorrect fuses or circuit breakers in
power line.
Install correct fuses or circuit breakers.
Motor overheats. Motor overloaded. Reduce pressure on workpiece. Allow saw
to cool down before restarting.
Extension cord too long or not proper
gauge.
Use shorter extension cord, or larger
gauge.
Air circulation through motor is
restricted.
Blow out motor vents with compressed air
to restore normal air circulation.
Motor stalls, or fails to
reach full speed.
Motor overloaded. Reduce pressure on workpiece.
Improper extension cord. Use proper extension cord.
Low voltage. Correct the low voltage conditions.
Air circulation through motor is
restricted.
Blow out motor vents with compressed air
to restore normal air circulation.
Motor failure. Have motor inspected by a qualified service
center.
Incorrect fuses or circuit breakers in
power line.
Install correct fuses or circuit breakers.
Machine slows when
operating.
Applying too much pressure to
workpiece.
Feed workpiece more slowly.
Cuts not square. Fence not parallel to blade Align fence square to blade.
90-degree stop is misaligned. Adjust 90-degree stop.
Poor cutting
performance.
Blade is dull. Sharpen or replace blade.
Workpiece is creeping during cut. Adjust hold-down for better clamping.
Blade not appropriate for material
being cut.
Use proper blade for selected material.
Blade coasts after
trigger is released.
Electrical blade brake malfunction. Have saw inspected by a qualified service
center.
Table 6
*Warning: Some corrections may require a qualified electrician.
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