Lincoln Electric SVM104-A service manual Connect ALL Input

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F-5

TROUBLESHOOTING & REPAIR

TROUBLESHOOTING GUIDE

Observe Safety Guidelines

detailed in the beginning of this manual.

PROBLEMS

POSSIBLE AREAS OF

RECOMMENDED

(SYMPTOMS)

MISADJUSTMENT(S)

COURSE OF ACTION

OUTPUT PROBLEMS

The air begins to flow, the

1. Check the torch consum-

1. If

the

high

frequency

"OUTPUT ON" LED lights for a

ables to be sure they are

"spark" is present at the

short time, but no pilot arc is

installed securely.

Make

spark gap located inside the

established. The high frequen-

sure they

are not

dirty or

panel, the torch and cable

cy arc does NOT appear

greasy and are in good con-

assembly

may

be

faulty.

across the torch tip.

dition. Replace the consum-

Perform

the

Torch,

Torch

ables if necessary.

Cable

Assembly,

and

2. Check for

the presence of

Internal

Trigger

and

Safety

Circuit Tests.

high frequency at the spark

gap, located inside the Right

2. If

the

high

frequency

Case Side Assembly panel

"spark" is not present at the

of the machine. The “spark”

spark gap, check that pilot

normally will be present for

control relay (CR2) contacts

a second or two when the

close when the torch trigger

torch trigger is pulled.

is pulled.

3. Check the high frequency

a.

If

pilot

control

relay

(CR2)

contacts

close

when

spark gap setting. It should

torch trigger is pulled, per-

be at .060” (1.5mm). DIS-

form

High

Voltage

CONNECT

ALL

INPUT

Transformer Test.

POWER BEFORE ADJUST-

b. If pilot control relay

ING THE HIGH FREQUEN-

(CR2)

contacts

DO

NOT

CY CIRCUIT.

close, test for 115 VAC

4. If the high frequency “spark”

between leads #36 and #31

on pilot control relay (CR2)

is present at the spark gap

when the torch trigger is

located inside the panel, the

pulled.

If 115 VAC IS pre-

torch and

cable assembly

sent,

pilot

control

relay

may be faulty.

(CR2)

could

be

faulty.

Replace.

If 115 VAC IS NOT pre-

sent, check plug J10 on

Control Board and asso-

ciated wires for loose or

faulty

connections. If none

are

found,

Control

Board

could be faulty. Replace.

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