Lincoln Electric IDEALARC IM402-B Operator's Manual page 14

A. Welder will not weld.
B. Welder welds, but soon stops
welding (DC only).
1. Line switch not turned "On".
Supply line fuse blown.
2. Power circuit dead.
3. Broken power lead.
4. Wrong voltage.
5. Electrode or work lead loose or
broken.
6. Open transformer circuit.
7. Polarity switch not centered.
1. Proper ventilation hindered.
2. Welder loaded beyond rating.
3. Fan motor inoperative.
4. Poor internal connections.
5. Excessive dust accumulation in
welder.
6. Bi-metallic thermostat dirty.
– –
14
1. Place line switch in "On" posi-
tion. Replace. (Look for reason
for blown fuse first).
2. Check supply line voltage.
3. Repair.
4. Check voltage against rating
plate. Check reconnect panel
jumper.
5. Tighten and repair connections.
6. Send to repair shop to have coils
replaced.
7. Center switch handle on DC(+),
DC(-), or AC.
1. Make sure all case openings are
free for proper circulation of air.
2. Operate at normal current and
duty cycle consistent with rating.
3. Check leads and motor bear-
ings. Fan motor can be tested
on 115V line; with welder on,
voltage across fan motor should
be approximately 115V.
4. Check for loose or hot connec-
tions and tighten.
5. Blow out welder with low pres-
sure.
6. Carefully clean in naptha.