Graco 309909H important safety instructions Circuit. See Electrical Schematic

Troubleshooting

Problem	Cause	Solution
Paint does not cure consistently.	Ratio not set correctly.	Check that correct ratio is set and set by
		volume. See ProMix Easy Operation
		manual.
	Material not mixing correctly.	Test pump. Page 9.
		Make sure mixer is clean; flush as
		needed. See ProMix Easy Operation
		manual.
	Pump not operating correctly.	Observe whether pumps are loading and
		checking correctly, if not, clean and repair
		pump. See displacement pump manual
		310662.
Poor spray pattern.	Fluid pressure too low.	Increase pump pressure.
	Spray tip dirty or worn.	Relieve pressure. Clean or replace tip.
		Follow gun manual instructions.
	Fluid A or B filters plugged.	Clean filters.
	Mixer or hoses partially plugged or too	Inspect parts for cured material. Clean or
	restrictive.	replace, or use larger hoses and mixer.
System runs erratically.	Air filter(s) clogged. Replace elements.	Clean. Replace element(s). See page 15.
	Air supply hoses undersized.	Replace hoses with appropriate size.
	Air compressor undersized.	Use larger air compressor.
	Air supply pressure tank undersized.	Use larger pressure tank.
Air supply relief valve opens.	Turbine air regulator set too high.	Lower setting to 23-25 psi (172-241 kPa,
		1.7-2.4 bar).
Turbine alternator makes high-pitched	Turbine bearings worn. (Setting turbine	Replace bearings. Page 19.
whining noise.	air regulator too high, wears bearings.)
Display shows 88888 or unit reboots	Turbine is not supplying enough power to	Increase turbine regulator setting to
unexpectedly.	board.	23-25 psi (172-241 kPa, 1.7-2.4 bar).
		Check turbine and electrical control
		exhaust air for restrictions.
		Replace turbine bearings. Page 19.
ProMix Easy does not start when start	Faulty start switch or wire harness.	Check start switch and wiring harness
button is pressed.		continuity; switch is normally open circuit.
		See Electrical Schematic, page 22.
	Faulty stop switch or wiring harness.	Check stop switch and wiring harness
		continuity; stop switch is normally closed
		circuit. See Electrical Schematic, page
		22.
	Bad I/O port on display board.	Replace board. Page 18.
	Bad I/O port on main board.	Replace board. Page 17.
Dispense valves leaking.	Loose or worn packings.	Tighten packing nut. If leak continues,
		replace packings. See 310655.

309909H 11