Pro-Weld CD-212 Operation & Maintenance Manual page 27

PRO
PROBLEM
3. Welder turns on but
does not operate
4. Weld is excessively hot
regardless of voltage
setting.
5. Poor and erratic
welding.
WEL D
POSSIBLE CAUSE
A. Ground cable connections
not complete.
*B. Broken gun control cable
or loose wire connection
in the plug. Shorted or
open trigger switch.
*C. Faulty printed circuit
board.
D. Shorted weld SCR.
A. Shorted charge SCR.
*B. Faulty printed circuit
board.
C. Open voltage
potentiometer.
A. Improper gun setup.
B. Improper grounding or
cable setup or incorrect
polarity.
C. Weld cables are coiled.
D. Incorrect voltage setting.
E. Studs or pins not
perpendicular to work
surface.
CD -2 1 2
CORRECTIVE ACTION
Check for continuity
Check continuity between
pins on control plug while
trigger is depressed.
Should read continuity.
Replace with new PC
Board.
Check with ohmmeter
(should not show continuity
in either direction). Replace
rectifier module if shorted.
Check with ohmmeter
( should not show continuity
In either direction). Replace
if shorted.
Replace with new PC
Board.
Replace defective voltage
Potentiometer.
Check applicable gun setup
Instruction page.
Check applicable cable setup
Instruction page.
Straighten out cables.
Adjust as necessary.
Adjust legs as necessary.
Replace defective legs.
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