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288859 Motor Test

1. Remove the pump pin and try to run the sprayer. If the motor runs check for locked or frozen pump

or drive train

. If sprayer does not run, go to next step.

Set sprayer to OFF and disconnect power to sprayer .

Disconnect motor connector from control board . Check the motor connector and

control board contacts. They must be

clean and secure.

Reconnect

motor connector

control board socket(s). Turn the pressure knob clockwise a ½ turn. Try to restart the motor.

motor does not run follow the steps below.

Step 1

Step 2

Step 4

Checking the motor wires for a short.

Put the (+) meter lead on the motor case.

Move the (-) meter lead to each wire.

Meter should read open on all the wires.

Perform a spin test by connecting a 9 volt

battery or larger to the motor leads.

Step 3

Checking the motors thermal protection.

Meter should read100K

Note: motor should be cooled down.

Use CAUTION not to distort the connectors when inserting the meter probes.

9 volt

battery

��

1-3 ohms

��

100 K

+ 5%.

Spin the motor while checking.

If a open is found replace the motor.

Graco FinishPro 390 Repair Electrical Manual

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