To Compressor
Power
Plug
Green
White
Black
Control Board
Connector
Compressor
Air Solenoid (N/O).
When the compressor is ON,
voltage is present.
When the compressor is OFF,
voltage is NOT present.
AA Mode
Airless Mode
Off
Power switch in
the AA Mode.
Cord plugged in.
Meter on AC Volts
Compressor
AA Mode
Airless Mode
Off
Step 1
J4
Control
Board
110-120 AC
V
--
--
J3
Connector
Power
Plug
+ +
To
NO
See step 1. Do you have
over 100 AC volts?
YES
Does the airless
motor run?
YES
See ON/OFF
Switch Test section
Replace the
power switch.
NO
Replace the
compressor.
Is the compressor
trying to start?
(Humming)
NO
See Air Compressor
Will not build
pressure section.
YES
390 FinishPro
Air Compressor will not start.
16
