
12 ©2008 MIDWEST FASTENERS, INC. — Eagle Pin Welding System
TROUBLESHOOTING CHART (Continued)
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
4. Welder turns on, but
does not operate. (cont.)
5. Weld is excessively hot
regardless of voltage
setting.
6. Consistently poor or
erratic welds.
7. No “Contact” light.
(Yellow LED)
8. No “Trigger” light.
(Green LED)
9. 1 Amp fuse blows.
10. 1/2 Amp fuse blows.
D. Weld SCR shorted.
E. Defective printed circuit (PC) board.
A. Shorted charge SCR.
B. Faulty printed circuit board.
C. Open voltage potentiometer.
A. Improper gun setup.
B. Improper grounding, cable
installation or incorrect polarity.
C. Weld cables coiled.
D. Incorrect weld voltage setting.
E. Pins (or studs) not perpendicular to
workpiece.
F. Faulty printed circuit board.
A. Faulty ground connection.
B. Break in weld cable, connectors or
receptacles.
C. Faulty printed circuit board.
A. Faulty trigger switch.
B. Break in control cable, connectors
or receptacles.
C. Faulty printed circuit board.
A. Shorted components on PC board.
A. Shorted components on PC board.
Turn power off, unplug welder from
AC power. Remove PC Board. Check
for continuity between weld cam-lok
receptacle and negative buss bar.
Replace SCR if continuity exists.
Repair or replace PC board.
Check continuity across SCR. No
reading should be observed in either
direction. Replace charge SCR if
continuity exists.
Repair or replace PC board.
Replace defective voltage “pot”.
Check gun for proper setup (see pg.7).
Check grounding and cable installation
for proper setup (see pg.7).
Straighten out cables or place in
random loops.
Adjust as necessary (see pg.8).
Adjust gun set up as necessary. Re-
place bent/defective legs (see pg.7).
Repair or replace PC board.
Verify ground cable/connections.
Replace defective component(s).
Repair or replace PC board.
Replace defective switch.
Replace defective component(s).
Repair or replace PC board.
Repair or replace PC board.
Repair or replace PC board.
If you need assistance with setup, or operation, call MIDWEST FASTENERS Technical Support
at (800) 852-8352 Monday through Friday between 8am and 5pm Eastern time.