Jet 708457DXJ, Operating Instructions And Parts Manual

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13.2 Mechanical and electrical problems
Trouble Probable Cause Remedy
Machine will not
start/restart or
repeatedly trips
circuit breaker or
blows fuses.
No incoming power.
Verify unit is connected to power, on-
button is pushed in completely, and
stop-button is disengaged.
Building circuit breaker trips or fuse
blows.
Verify that jointer is on a circuit of
correct size. If circuit size is correct,
there is probably a loose electrical
lead. Check amp setting on motor
starter.
Switch or motor failure (how to
distinguish).
If you have access to a voltmeter, you
can separate a switch failure from a
motor failure by first, verifying
incoming voltage at 110/220+/-10%
and second, checking the voltage
between switch and motor at
110/220+/-10%. If incoming voltage is
incorrect, you have a power supply
problem. If voltage between switch
and motor is incorrect, you have a
switch problem. If voltage between
switch and motor is correct, you have
a motor problem.
Motor overheated.
Clean motor of dust or debris to allow
proper air circulation. Allow motor to
cool down before restarting.
Motor failure.
If electric motor is suspect, you have
two options: Have a qualified
electrician test the motor for function
or remove the motor and take it to a
qualified electric motor repair shop
and have it tested.
Unit incorrectly wired.
Double check to confirm all electrical
connections are correct. Refer to
sect.
16.0 Wiring Diagrams to make any
needed corrections.
On/off switch failure.
If the on/off switch is suspect, you
have two options: Have a qualified
electrician test the switch for function,
or purchase a new on/off switch and
establish if that was the problem on
change out.
Table 3