Graco Inc 224400 Test Power Supply Resistance See Fig, Test Resistor Stud Resistance See Fig

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Electrical Tests

Test Power Supply Resistance (See Fig. 9)

Remove the power supply (18) from the gun. See Power Supply Removal and Replacement, page 27.

Remove the turbine alternator from the power supply. See Turbine Alternator Removal and Replacement, page 28.

Measure the resistance from the power supply’s ground contact point (EE) to the contact inside of the power supply seal (B) [the conductive rubber contact may be slightly recessed into the seal].

The resistance should be 297 to 363 megohms. If the resistance is outside the specified range, the power supply is defective and must be replaced. If the resis- tance of the power supply is correct, proceed to the next test.

If you still have problems, refer to Electrical Troubleshooting for other possible causes of poor performance, or contact the nearest authorized service agency.

NOTE: Be sure the seal (B) is in place on the end of the power supply before installing the power supply back into the gun.

A

EE

B 18

TI0378

Fig. 9

Test Resistor Stud Resistance (See Fig. 10)

Remove the resistor stud (22). See Air Cap/Nozzle/ Resistor Stud Replacement, page 22. Check the resistance between the black resistor stud contact ring

(D)and the needle contact ring (E). You may have to press down on the contact ring (D) in several places to get a good reading.

The resistance should be 21 to 29 megohms. If the resistance is correct, make sure the metal contact in the gun barrel and the needle contact ring (E) are clean. If the resistance is outside the specified range, the resistor is defective and the resistor stud (2) must be replaced. See Air Cap/Nozzle/Resistor Stud Replacement.

WARNING

FIRE, EXPLOSION, AND

ELECTRIC SHOCK HAZARD

The resistor stud contact ring (D) is a conductive contact ring, not a sealing o-ring. See Fig. 10. To reduce the risk of sparking or electric shock, do not remove the resistor stud contact ring (D) or operate the gun without the contact ring in place. Do not replace the resistor stud (22) with anything but a genuine Graco part.

22

D

E

0442

Fig. 10

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Contents Part No , Series B Air Spray Gun with two-finger trigger 308131Part No , Series B Air Spray Gun with four-finger trigger Read and Keep for Reference308131 Symbols Table of ContentsFIRE, EXPLOSION, and Electric Shock Hazard Pressurized Equipment Hazard Non-Hazardous Area InstallationHazardous Area KEYInstalling the System Ventilate the Spray BoothConnect the Air Line Refer to Fig Connect the Exhaust Tube Ground the SystemFIRE, EXPLOSION, Electric Shock Hazard Check the Electrical Grounding See Fig Page Operating Checklist Pressure Relief ProcedureOperation Filter the FluidSelecting a Fluid Nozzle and Air Cap Operating the Spray GunComponent Rupture Hazard Fine Adjustments of the Spray Gun Atomizing Air Valve AdjustmentDaily Care and Cleaning MaintenanceShutdown FIRE, EXPLOSION, and Electric Shock HazardProcedure Clean the Air Cap and Fluid NozzleFlush the Spray Gun Equipment neededTroubleshooting Spray Pattern TroubleshootingProblem Cause Solution Gun Operation Troubleshooting See Check the Electrical Grounding Electrical TroubleshootingElectrical Troubleshooting with SVR Test Gun Resistance See Fig Electrical TestsTest Resistor Stud Resistance See Fig Test Power Supply Resistance See FigService Prepare the Gun for ServiceAir Cap/Nozzle/Resistor Stud Replacement Electrode Needle Replacement Barrel Removal Fluid Packing Removal Fluid Packing Rod Repair Power Supply Adjustment Power Supply Removal and ReplacementBarrel Installation Turbine Alternator Removal ReplacementDetail Fan Air Adjustment Valve Repair45c 45a  45b  45d  41 45e Fluid Adjustment Assembly RepairAir Trigger Valve Repair Atomizing Air Valve Removal and ReplacementMoving Parts Hazard ES ON-OFF Valve Repair308131 Detail a PartsElectrostatic Air Spray Gun, with four-finger trigger Part No , Series BConductive Air Supply Hose black AccessoriesExtended Air Fitting Air Shutoff ValveSafety Warning Signs Grounding Clamp and WireFluid Hose Assemblies Nylon MegohmmeterGun System GUN SystemsManual Change Summary Technical DataCategory Data FCC ID JHI1Graco Standard Warranty Graco Phone NumberToll Free