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TROUBLESHOOTING & REPAIR
PRO-CUT 60
F-4
Observe Safety Guidelines
detailed in the beginning of this manual.
TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
No LEDs light when the
ON/OFF Power Switch is turned
"ON". Machine is dead. Fan
runs normally.
The "MACHINE ON" LED is lit
and the "SAFETY" LED is lit.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
1. Make sure input voltage
corresponds to machine
nameplate voltage.
2. Make certain the reconnect
panel is configured properly
for input voltage being
applied to PRO-CUT 60
1. Push the "SAFETY RESET"
button, the LED should go
out. This circuit sometimes
trips on power up or because
of "noise". If the circuit can
be reset, it is OK to continue.
2. Maintain proper stand-off
while cutting (.10” to .15”).
Too long a stand-off may
cause nuisance safety trips.
3. Check torch consumables.
Replace if needed.
4. Replace the torch and cable
assembly.
RECOMMENDED
COURSE OF ACTION
1. Check plug J7 (located on
the Control Board) and
associated wires for loose
or faulty connections.
2. Check Plug J9 on Status
Board and J8 on Control
Board for loose or faulty
connections
3. Test for 24 VAC between
leads C2 and H6 (plug J7)
on Control Board. Refer to
wiring diagram.
a. If the 24 VAC IS NOT
present or voltage is very
low, the main transformer
could be faulty. Perform
Main Transformer Test.
b. If the 24 VAC is
present at leads C2 to H6,
the Control Board could be
faulty. Replace.
1. The torch and cable
assembly may be faulty.
Perform Torch, Torch Cable
Assembly, and Internal
Trigger and Safety Circuit
Tests.
2. Check for continuity (zero
ohms) between leads #336
and #337 from the torch
4-pin connector on the
machine to plug J5 on the
Control Board. Refer to
wiring diagram.
3. Check Pilot bleed resistor
R3. Normal is 40 ohms.
See wiring diagram.
4. The control board could be
faulty. Replace.
5. Perform Main Transformer
Test.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln
Electric Service Department for technical troubleshooting assistance before you proceed call 216-383-2531 or 1-800-833-9353.
OUTPUT PROBLEMS
CAUTION