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WARNING: ELECTRIC SHOCK can kill; MOVING PARTS
can cause serious Inlury.
• Do nottouch live electrical parts.
• Shutdown wire feederand welding powersource or stop
engine before making or changing meter lead connec-
tions and before disconnecting or connecting any leads.
• Have only qualified persons familiar with and following
standardsafetypractices perform troubleshootingproce-
dures.
• Follow standard ESD precautions to prevent damaging
static-sensitive parts during testing.
UIN
GND
+35 volts dc
Circuit
input
common
Diagram 8-3. Troubleshooting Circuit Diagram For Optional SpotlBurnback Board PC2
TM-1571 Page 22
TRIGGER
+19 volts dc Input with
gun trIgger pressed
Spot time
potentiometer
R25
/
Not used
S-21 E
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Troubleshooting
