Pressure Control Switch Diagnostics
Pressure Control Switch Diagnostics
ProX7, ProX9, X5, and X7
If pressure control switch diagnostics reveal a damaged pressure control, replace it with the correct Pressure Con- trol Switch Kit, see page 26. X5 and X7 sprayers have different pressure control kits because stall pressure is pre- set at the factory.
1.Unplug power cord and Relieve Pressure, page 9.
2.If paint is leaking from pressure control switch between pressure control knob and base, replace pressure control switch.
3.ProX7 and ProX9: Remove front cover, yoke, and pins. Disconnect pressure control switch connector from control board.
X5 and X7: Remove enclosure and disconnect pressure control switch connector from control board. Use finger to support control board when removing pressure control switch connector.
4.Use ohmmeter to check for no continuity between sprayer ground and both pressure control terminals
in connector. If either pressure control switch lead is shorted to ground, pressure control switch wires have been pinched to ground during assembly and pressure control switch needs to be replaced.
5.Use Ohmmeter to measure across two terminals in pressure control connector. No continuity or open circuit should exist when pressure control knob is at lowest pressure setting (full
6.Using ohmmeter to measure across two terminals in pressure control connector. Continuity or closed circuit should exist when pressure control knob is set at maximum pressure (full clockwise). Replace pressure control switch if no continuity exists.
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