HP GRACO OR PRO TI1681A manual Test Electrode Resistance

Electrical Tests

Test Electrode Resistance

1.Prepare the gun for service as instructed on page 41.

2.Insert a conductive rod (B) into the gun barrel (removed for the power supply test) and against the metal contact (C) in the front of the barrel.

3.Measure the resistance between the conductive rod

(B) and the electrode (29). The resistance should be 20-30 megohms. See FIG. 19..

4.If in range, refer to Electrical Troubleshooting on page 39 for other possible causes of poor perfor- mance, or contact your Graco distributor.

5.Remove the electrode (29), page 43. Measure the resistance between the contact (E) and the elec- trode wire (F). The resistance should be 20-30 megohms. If out of range, replace the electrode. See FIG. 20..

6.Make sure the metal contact (C) in the barrel, the nozzle contact ring (7a, FIG. 21.), and the electrode contact (E) are clean and undamaged.

C

29 B

ti1499a

F 29 E

ti1548a

Fig. 20. Electrode

7a

ti1513a

Fig. 21. Nozzle Conductive O-Ring

Fig. 19. Test Electrode Resistance

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