Graco Ultra MAX II 490 PC Pro Operation, Parts page 37

Electrical cont...
Sprayer Will Not Shut Off
1. Perform Pressure Relief Procedure,
page 12. Leave prime valve open
(down) and turn ON/OFF switch OFF.
Troubleshooting Procedure
Plumb pressure gauge into paint hose,
plug sprayer in, and turn power switch ON.
Does sprayer reach or exceed
its maximum pressure?
Is the control board status light on?
Unplug the transducer from control board.
Does motor stop running?
Bad transducer.
Replace and test with a new one.
3A6491E
YES
YES
YES
Troubleshooting
2. Remove control box cover so the
control board status light can be viewed
if available.
Mechanical problem:
See the proper fluid pump
NO
manual for the sprayer for
further troubleshooting procedures.
Replace the control board.
NO
Replace the control board.
NO
ti24731a
37