Lincoln Electric SVM104-A service manual Troubleshooting Guide, Pro-Cut

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TROUBLESHOOTING & REPAIR

F-4

Observe Safety Guidelines

TROUBLESHOOTING GUIDE

detailed in the beginning of this manual.

PROBLEMS

POSSIBLE AREAS OF

RECOMMENDED

(SYMPTOMS)

MISADJUSTMENT(S)

COURSE OF ACTION

OUTPUT PROBLEMS

No LEDs light when the

1. Make sure input voltage

1.

Check plug J7 (located on

ON/OFF Power Switch is turned

corresponds

to machine

the Control

Board) and

"ON". Machine is dead. Fan

nameplate voltage.

associated wires for loose

runs normally.

2. Make certain the reconnect

or faulty connections.

2.

Check

Plug

J9

on

Status

panel is configured properly

Board and J8 on Control

for

input

voltage being

Board for loose or faulty

applied to

PRO-CUT 60

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.

The "MACHINE ON" LED is lit

1. Push the "SAFETY RESET"

1.

The

torch

and

cable

and the "SAFETY" LED is lit.

button, the LED should go

assembly

may

be

faulty.

out.

This circuit sometimes

Perform Torch, Torch Cable

trips on power up or because

Assembly,

and

Internal

of "noise".

If the circuit can

Trigger and

Safety

Circuit

be reset, it is OK to continue.

Tests.

2. Maintain proper stand-off

2.

Check

for continuity (zero

ohms) between leads #336

while cutting (.10” to .15”).

and #337 from

the

torch

Too long a stand-off may

4-pin connector on the

cause nuisance safety trips.

machine to plug J5 on the

3. Check torch

consumables.

Control Board.

Refer to

wiring diagram.

Replace if needed.

3.

Check

Pilot

bleed resistor

4. Replace the torch and cable

R3. Normal is 40 ohms.

See wiring diagram.

assembly.

4.

The control board could be

faulty. Replace.

5.

Perform Main Transformer

Test.

CAUTION

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.

PRO-CUT 60