AIRLESSCO 910E Manuel de service télécharger pdf (Page 30)

TROUBLESHOOTING - Machine does not start

CAUSE SOLUTION

STEP 1: Ensure that the ON-Off toggle switch is in the "ON" position

and that the Pressure Control Knob is fully CW (maximum pressure).

Also check that the unit is plugged in.

STEP 2: Lower the pressure control assembly and check if the

red power light on the board is lit. If the light is "OFF", proceed to

Step 3. If the light is "ON", go to Step 7.

STEP 3: Use a multimeter to check for 110 volts VAC across the L1 and L2

terminals on the board. If no voltage at these leads, there is no power to the

unit. Check power source (outlet, breakers, extension cord and power cord).

STEP 4: Disconnect the two red motor leads (S1 & S2) and test for continuity

between the two leads. Continuity shows that the motor's thermal coupler has

not tripped. No continuity means that thethermal coupler has opened due to ex-

cessive motor heat. If the motor is still hot to touch, allow to cool and retest. If

the motor is cool and there is no continuity on the red leads, contact your local

Leeson repair facility to repair/replace the thermal coupler.

STEP 5: If all checks out ne in Steps 1 through 4 and the red light is still

out, the pressure control assembly is defective and must be replaced.

STEP 6: If the red light is "ON", the power source, fuse and thermal coupler

are okay. Plug another sensor into the board. If the unit starts, the sensor was

faulty and must be replaced. When a replacement sensor is not available, use

a multimeter to test the resistance between the BLACK and RED wires on the

sensor lead. The resistance should be approximately 1.5-3.5 kohms. A faulty

sensor usually reads zero resistance (open).

STEP 7: With the machine still "OFF", remove the potentiometer lead from

the board and read the resistance between the red and black wires. This must be

8 - 12 kohms. If outside this range, replace the potentiometer.

NOTE: A bad POT will usually show no resistance (open).

STEP 8: Remove the two black motor leads (A1 &A2) and test for continuity

between them. Continuity is an indication that the motor is sound. The lack of

continuity, points to a problem in the motor. If there is no continuity on these

two leads, check the motor brushes. Ensure thatthe brushes are evenly worn

and make solid contact with motor commutator. Replace the brushes if they are

less than 3/8" long. If the brushes are okay, replace the motor.

STEP 9: Calibrate the pressure control assembly in accordance with the in-

structions on page 25-26.

STEP 10: If the unit fails to calibrate and all components in Steps 1-9 test

okay, the pressure control assembly needs to be replaced.

Control Settings

Power Source

Thermal Overload

Pressure Control

Assembly (Board)

Pressure Control

Knob (Potentiometer)

Motor

Pressure Calibration

Pressure Control

Assly. (Board)

Sensor

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AIRLESSCO 910E Manuel de service Page 30

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