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Electrical Tests
32 309293J
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 F
IG. 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 F
IG. 20..
6. Make sure the metal contact (C) in the barrel, the
nozzle contact ring (7a, F
IG. 21.), and the electrode
contact (E) are clean and undamaged.
Fig. 19. Test Electrode Resistance
Fig. 20. Electrode
Fig. 21. Nozzle Conductive O-Ring
ti1499a
B
29
C
ti1548a
F29E
ti1513a
7a