Graco 247937, 247936 Test Power Supply Resistance, Test Barrel Resistance

Electrical Tests

Test Power Supply Resistance

1.Remove the power supply (18), page 31.

2.Remove the turbine alternator (19) from the power supply, page 32.

3.Measure resistance from the power supply's ground strips (EE) to the conductive contact in the center of the power supply seal (FF). See FIG. 11.

4.The resistance should be 55-70 megohms. If out- side this range, replace the power supply. If in range, proceed to the next test.

AA

FF EE

ti1599a

Fig. 11. Test Power Supply Resistance

Test Barrel Resistance

1.Insert a conductive rod (GG) into the gun barrel (removed for the power supply test) and against the metal contact (HH) in the front of the barrel.

2.Measure the resistance between the conductive rod (GG) and the charging probe socket (CC). See FIG. 12. The resistance should be 15-30 megohms.

3.If the resistance is outside the range, replace barrel.

4.If resistance is in range, reassemble the gun and test the gun resistance.

5.If you still have problems, refer to Gun Repair on page 27 for other possible causes of poor perfor- mance, or contact your Graco distributor.

AA

GG HH

CC

ti12821

Fig. 12. Test Barrel Resistance

24 312900G