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Electrical Tests
24 312900C
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 F
IG. 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.
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 F
IG.
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.
Fig. 12. Test Barrel Resistance
ti1599a
EE
FF
AA
CC
HH
AA
GG
ti12821