Control Board Diagnostics (ProX7 and ProX9)
Control Board Diagnostics (ProX7 and ProX9)
Check for motor problems before replacing control board. A damaged motor may burn out a good control card.
Check for a damaged control board or pressure control switch as follows:
7.Attach harness from a pressure control switch you know is functioning correctly to control board.
Pressure control switch does not have to be 
installed in pump.
1.Relieve Pressure, page 9.
2.Unplug electrical cord.
3.Remove four cover screws and front cover. Remove motor enclosure.
4.Remove yoke and guide rods.
5.Remove gear.
6.Remove pressure control harness from control board. Using tip of small, flat blade screwdriver, press tab on right side connector to release.
8.Turn pressure control adjustment knob (C) +to max- imum pressure setting.
9.Plug electrical cord into 120VAC receptacle.
10.Turn power switch (B) ON.
•If motor runs, replace pressure switch. Pressure Control Switch Kit, page 26.
•If motor does not run, replace control board repeat test. Control Board Kit, page 26.
Control Board Diagnostics (X5 and X7)
Check for motor problems before replacing control board. A damaged motor may burn out a good control card.
1.Unplug electrical cord and Relieve Pressure, page 9.
2.Remove enclosure and check all control board connectors for proper installation (see Wiring Diagram, page 36).
3.Check fuse on control board. If fuse is blown, determine the cause before replacing control board (see Advanced Troubleshooting, page 16).
Pump Diagnostics
CAUTION
When repairing or cleaning the pump, never submerge pump in water or allow fluid to enter pressure control.
When pump packings wear, paint begins to leak down the outside of the pump. At the first sign of leakage, replace the pump or additional damage to the drive train could occur.
1.X5 and X7: Replace pump using Pump Replace- ment (Complete). See List of Kits, page 26.
ProX7 and ProX9: Replace pump using Pump Repair kit. See List of Kits, page 26.
2.If there is no paint leakage, see Advanced Troubleshooting, page 16. Pump may not be defective.
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