Filter
Top Products
Control Board Diagnostics (ProX7 and ProX9)
312667B 25
Control Board Diagnostics (ProX7 and ProX9)
Check for a damaged control board or pressure control
switch as follows:
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.
7. Attach harness from a pressure control switch you
know is functioning correctly to control board.
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)
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
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.
Check for motor problems before replacing control board. A damaged motor may burn out a good control card.
Pressure control switch does not have to be
installed in pump.
Check for motor problems before replacing control board. A damaged motor may burn out a good control card.
CAUTION
When repairing or cleaning the pump, never submerge
pump in water or allow fluid to enter pressure control.