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TROUBLESHOOTING & REPAIR
F-8 F-8
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
FEEDING PROBLEMS
Meter reads low voltage (1-2 VDC),
and output is extremely low or no
output.
Local/Remote Switch must be in
LOCAL position unless Remote
Control device is attached to remote
receptacle.
1. See Output Diodes test.
2. See Capacitor Balance tests.
3. See Switch Board test.
4. See Power Board test.
5. Control Board may be defective.
Poor welding, weld settings drift, or
output power is low.
Check welding procedures and weld
cable connections.
Check with machine on local con-
trol.
Check input voltages and input volt-
age reconnect procedures. See
Installation section of this manual.
1. Check Mode Switch S2 for dam-
age and continuity.
2. Check for continuity between
Mode Switch S2 and Control
Board. See Wiring Diagram in
Section G.
3. Check for loose or faulty con-
nections in heavy current-carry-
ing leads (i.e., choke, shunt,
output bridge, and output
studs). See wiring diagram in
Section G.
4. See Overcurrent Protection
Current Trigger Circuit tests.
5. See Control Board test
W
elding “too hot”. Actual weld cur-
rent is considerably higher than dis-
play indicates.
Check condition of the shunt and
leads to the Control Board.
See Step 7 of the Overcurrent
Protection Current T
rigger test
If shunt and leads check OK, possi-
ble defective Control Board
V300-I
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-888-935-3877.