Graco MARK V

Troubleshooting
20 3A0157C
110-120 AC
V
-
+
-
110-120 AC
V
-
+
-
-
100k ohm
+
-
ti26798a
STEP 1:
Plug power cord in
and turn switch ON.
Connect wires to
control board and
on/off switch. Turn
meter to AC Volts.
STEP 2:
Plug power cord in
and turn switch ON.
Connect wires to
control board and
on/off switch. Turn
meter to AC Volts.
STEP 3:
Check motor thermistor.
Unplug yellow wires. Meter
should read according to
Resistance Table on page 17.
NOTE: Motor should be cool
during reading.
STEP 4:
Plug power cord
in and turn switch
ON. Disconnect
potentiometer.
Black
Black
Black
Black
Black
Black
Black +
Black
On/Off
Switch
Control
Board
White
Power Cord
Control
Board
Control
Board
Control
Board
On/Off
Switch
Power Cord
White
Thermal
Switch
Pressure
Transducer
Potentiometer
Motor
AutoClean
WatchDog
Switch:
On - Open
Off - Closed
Switch:
15 Amp - Closed
20 Amp - Open
On/Off
Switch
Power Plug
Green/Ground
White
Green/Ground
GFI Filter Coil
Motor
Motor
Sensor
Leads
Neutral
Thermal
Switch
To Optional
Display