Troubleshooting8-8Part 1614575-01 2019 Nordson CorporationGeneral Troubleshooting ChartProblem Possible Cause Corrective Action1. Uneven pattern Blockage in spray gun 1. Purge the spray gun. Removethe nozzle and electrodeassembly and clean them.2. Disconnect the powder feed hosefrom the spray gun and blow outthe gun with an air gun.3. Disassemble the spray gun.Remove the inlet and outlet tubesand elbow and clean them.Replace components asnecessary.Nozzle, deflector, or electrodeassembly worn, affecting patternRemove, clean, and inspect thenozzle, deflector, and electrodeassembly. Replace worn parts asnecessary.If excessive wear or impact fusion isa problem, reduce the flow rate andatomizing air flow.Damp powder Check the powder supply, air filters,and dryer. Replace the powdersupply if contaminated.Low atomizing air pressure Increase the atomizing air.Improper fluidization of powder inhopperIncrease the fluidizing air pressure.If the problem persists, remove thepowder from the hopper. Clean orreplace the fluidizing plate ifcontaminated.iFlow module out of calibration Perform the Re-Zero Procedure onpage 8-13.2. Voids in powderpattern (VT)Worn nozzle or deflector Remove and inspect the nozzle ordeflector. Replace worn parts.Plugged electrode assembly orpowder pathRemove the electrode assembly andclean it. Remove powder path ifnecessary and clean it.Electrode air wash flow too high Adjust the needle valve at the powerunit to decrease the electrode airwash flow.Continued...