5.
Be sure the spring (11a) is in place before
reinstalling the power supply.
Figure 16 Test Power Supply Resistance
Test
Test
Test Electrode
Electrode
Electrode Resistance
Resistance
Resistance
1.
Follow the steps under
Prepare the Gun for Service, page 48
2.
Insert a conductive rod (FF) into the gun barrel
(which was removed for the power supply test)
and against the metal contact (DD) in the front
of the barrel.
3.
Measure the resistance between the conductive
rod (FF) and the electrode (3). The resistance
should be 10–30 megohms (less than 5 megohms
for Model L60M19).
4.
If in range, go to
Electrical Troubleshooting, page 46
, for other
possible causes of poor performance, or contact
your Graco distributor.
5.
Remove the electrode (3), see
Electrode Replacement, page 52
. Measure the
resistance between the contact (HH) and the
electrode wire (GG). The resistance should be
10-30 megohms. If out of range, replace the
electrode.
6.
Make sure the metal contact ring (DD) in
the barrel, the nozzle contact ring (4a), and
the electrode contact (HH) are clean and
undamaged.
Figure 17 Test Electrode Resistance
Figure 18 Electrode
Figure 19 Nozzle Conductive O-Ring
40
3A7504A
