Electrical Tests
32
309457G
Test Electrode Resistance
1.
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.
2.
Measure the resistance between the conductive rod
(B) and the electrode (7). The resistance should be
20-30 megohms. See F
3.
If in range, refer to Electrical Troubleshooting on
page 38 for other possible causes of poor perfor-
mance, or contact your Graco distributor.
4.
Remove the electrode (7), page 42. Measure the
resistance between the contact (E) and the elec-
trode wire (F). The resistance should be 20-30 meg-
ohms. If out of range, replace the electrode. See
F
5.
Make sure the metal contact (C) in the barrel, the
nozzle contact ring (4a, F
. 21.), and the electrode
contacts (E) are clean and undamaged.
Fig. 19. Test Electrode Resistance
Fig. 20. Electrode
Fig. 21. Nozzle Conductive O-Ring
ti1499a
B
7
C
ti1548a
F
7
E
ti1513a
4a
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