TM 9-4940-568-20
2-101
Table 2-17. ARC Welder Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. NO WELD OUTPUT; UNIT IS COMPLETELY INOPERATIVE.
Line disconnect switch is in OFF position.
Place line disconnect switch in ON position.
Line fuse(s) open.
Check and replace line fuse(s).
Improper electrical input connections.
Verify input connections.
MAIN CIRCUIT BREAKER in OFF position
Check and reset MAIN CIRCUIT BREAKER if necessary.
INPUT SELECTOR (Easy Link) switch is set to incorrect position for applied input voltage.
Verify primary source voltage and set INPUT SELECTOR switch to correct setting.
4. WARNING INDICATOR IS ON.
Unit is is thermal shutdown mode.
a. Allow cooling period of approximately five (5) minutes with the power ON. Duty cycle
should be reviewed. To reset the WARNING indicator, the power supply must be turned
OFF, then ON again.
b. Measure input voltage and verify that it matches the INPUT SELECTOR (Easy Link)
switch setting. The length of the input power cable must be considered, as there will be
considerable voltage drop along its length.
