Finishpro 390; On/Off Switch Test; Air Compressor Is Trying To Start (Humming) - Graco FinishPro 390 Repair Electrical Manual

See step 1.Do you have
over 100 AC volts?
YES
See step 2. Do you have
over 100 AC volts?
YES
See step 3.Do you have
over 100 AC volts?
YES
Switch is good. Proceed to the proper Test Section
Airless Motor will
not sart. See Control
Board Test Section
110-120 AC
V
- -
Control
Board
J4
Power
Plug
Connector
Compressor

FinishPro 390

ON/OFF Switch Test

Check the connector
NO
If ok repair or replace
NO
power switch.
NO
power switch.
Compressor Motor will
not sart. See Compressor
will not start Test Section.
Step 2
Power switch in
the AA Mode.
Cord plugged in.
Meter on AC Volts
F1
FUSE
AA Mode
J3
Airless Mode
for the white wires.
the power Cord.
Replace the
Replace the
Power
Plug
Compressor
Off
Power
Plug
Compressor
Step 1
110-120 AC
Power switch in
the Airless Mode.
V
Cord plugged in.
Meter on AC Volts
- -
F1
Control
FUSE
Board
J3
J4
Connector
Step 3
110-120 AC
Power switch in
the AA Mode.
V
Cord plugged in.
Meter on AC Volts
- -
F1
Control
FUSE
Board
J3
J4
Connector
AA Mode
Off
Airless Mode
AA Mode
Off
Airless Mode
10