TROUBLESHOOTING -
Machine does not start
CAUSE
STEPS
(SEE FIGURE 17)
Pressure Control
Knob (Potentiometer)
STEP 1:
After making sure that the machine is plugged into the wall, verify that the
on-off switch is in the ON position and that the pressure control knob is turned all the
way to the right (clockwise for maximum pressure).
STEP 2:
Using your multi-meter, test the breaker for continuity or replace with a new
breaker. If the breaker reads good, move on to step three.
Control Settings
Power Source
STEP 4:
Locate the L1 and L2 terminals on the board, and then using your multi-meter
check to make sure you have 110 volts AC across the two terminals (the cord wires
will still be attached). If there is no voltage at these leads, there is no power getting
to the machine. Check your power source (outlet, circuit breaker, extension cord, and
power cord). If you have AC voltage at the L1 and L2 terminals, go to step 5.
STEP 3:
Using a Phillips Head screwdriver, remove the eight screws holding the
pressure control assembly. Locate the light on the board indicating that there is power
(it will be red or green). If the light is OFF proceed to step four. If the light is ON go
to step six.
35A Circuit Breaker
Thermal Overload
Pressure Control
Assembly (Board)
Sensor
Motor
STEP 5:
Disconnect the two red motor leads (S1 & S2) and test for continuity between
them. No continuity means that the thermal coupler has opened due to excessive motor
heat. If the motor is still hot to the touch, allow it to cool and then retest. If the motor
is cool and there is not continuity on the red leads, contact your local Leeson repair
facility to repair/replace the thermal coupler. Continuity shows that the motor's thermal
coupler has not tripped. Proceed to step six.
STEP 6:
If everything checks out in steps one through five and the power indicating
light is still out, replace the pressure control assembly.
STEP 7:
Remove the motor brush covers and turn the machine on. Set the potentiome-
ter (POT) at maximum pressure and check for DC voltage across both brush terminals.
You should read greater than 80 volts DC. IF YOU DO NOT HAVE DC VOLTAGE
GO TO STEP EIGHT. If you have DC voltage, turn the machine off and unplug it from
the wall. Check to make sure that the brushes are making good contact with the arma-
ture. Replace the brushes if they are less than 3/8" long. If the brushes are good, replace
the motor.
STEP 8:
Plug another sensor into the board and perform the zero calibration procedure.
If the machine starts to run, the sensor was bad. If there is no replacement sensor avail-
able, use a multi-meter to test the resistance across the red and black wires of the sensor
(be sure to test at the plug). You should read 1.5 - 3.5k ohms. A faulty sensor usually
reads no continuity (open). If the sensor passes all the tests move to step nine.
STEP 9:
Plug another potentiometer (POT) into the control board. If the machine
starts, the old POT is bad. When a replacement POT is not available, remove the
POT lead (with the machine turned off) from the control board and test the resistance
between the red and black wires (be sure to test at the plug). The resistance should read
between 8-12k ohms if it is outside of this range replace the POT.
STEP 10:
If you have DC voltage at the motor brushes and all of the components check
out fine in steps eight and nine, replace the pressure control assembly.
Pressure Control
Assembly (Board)
Power Source
30
Содержание 1110E
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