F. SYMPTOM: No control over motor speed at wire
feed potentiometer.
1. Check wire speed potentiometer with ohmmeter.
Resistance should range from 0 through 100 K
ohms. Resistance should range from 0 through
100 K ohms. Replace if defective.
2. Replace governor PC board.
3. Replace logic PC board.
G. SYMPTOM: Contactor in power supply does not
energize. Motor operates.
1. Check power supply control cable.
2. Check fuse (power supply).
3. Replace logic PC board.
H. SYMPTOM: Erratic or pulsing wire feed rate.
1. Replace logic PC board.
VI. TROUBLESHOOTING INFORMATION
If this equipment does not operate properly, stop
work immediately and investigate the cause of the
malfunction. Troubleshooting and maintenance
work must be performed by an experienced person,
and electrical work by a trained electrician. Do not
permit untrained persons to inspect, clean or repair
this equipment. Use only recommended replace-
ment parts.
Precautionary measures should be taken to provide
maximum protection against electrical shock. Be
sure that all power is off by operating the line (wall)
disconnect switch, before attempting any work in-
side the control.
A. SYMPTOM: F1 fuse blows whenever main line
switch is turned "ON".
1. Check wiring for shorts.
2. If no short, replace governor PC board.
B. SYMPTOM: F1 fuses blows when Inch Switch is
operated.
1. Check for jammed or defective wire feed motor/
drive unit.
2. Replace governor PC board.
C. SYMPTOM: Motor inoperative.
1. Check setting of Inch Speed pot.
2. Check main line fuse F1.
3. Check motor plug.
4. Check motor brushes.
5. Replace logic PC board.
6. Replace Governor PC board.
D. SYMPTOM: Wire feed motor operates by inching
but does not operate for welding.
1. Check setting of WFSP.
2. Check touch work indicator light for operation when
wire torches work.
3. Observe that both LED lights on logic PC board
are lit after arc initiating.
4. Replace logic PC board.
E. SYMPTOM: If wire feed motor continues to run
when wire touches plate and work light not on.
1. Check fuse (1/2 amp) located on logic board.
2. Check for fused flux at tip of welding wire.
3. Check power supply ground cable for connec-
tion to workpiece.
4. Replace logic PC board.
