Lincoln Electric SVM104-A service manual Disconnect ALL Input

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

TROUBLESHOOTING & REPAIR

F-6

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

The air begins to flow, the

1.

The pilot arc will shut

off

1.

The torch and cable assembly

"OUTPUT ON" LED lights for a

after 2.5 seconds unless it is

may be faulty.

Perform Torch,

short time, but no pilot arc is

brought in contact with the

Torch

Cable

Assembly,

and

established.

work and the cutting arc is

Internal Trigger and

Safety

established.

This

is

a

Circuit Tests.

If

the high

frequency "spark"

normal condition.

is present at the spark gap (for

2. Check the

torch consum-

1 second) go to step #3.

2. If the high frequency "spark" is

ables to be sure they are

not present at the spark gap,

installed properly.

Make

check that the pilot control

sure they are not dirty or

relay

(CR2)

contacts

close

greasy and are in good con

when the torch trigger is

dition. Replace the consum-

pulled.

ables if necessary.

a.

If

pilot control relay

(CR2)

contacts close when torch trig-

3.

Check for the

presence

of

ger

is pulled,

perform

High

Voltage Transformer Test.

high frequency "spark" at the

b.

If

pilot control relay

(CR2)

spark gap,

located

inside

contacts DO NOT close, test

the right panel of the

for 115 VAC between leads

machine.

The

"spark"

will

#36 and #31 on pilot control

normally be present for a

relay (CR2) when the torch trig-

second or two when the

ger

is

pulled.

Refer

to

wiring

torch trigger is pulled.

diagram. If 115 VAC is present,

pilot

control

relay

(CR2)

4.

Check the

high frequency

could be faulty.Replace.

c. If 115 VAC IS NOT present,

spark gap setting. It should

check

plug

J10 on

Control

be set at

.060"(1.5mm).

Board

and

associated

wires

DISCONNECT ALL INPUT

for loose or faulty connections.

POWER BEFORE ADJUST-

Refer

to wiring diagram.

If

ING THE HIGH FREQUEN-

none are found, Control Board

CY CIRCUIT.

could be faulty. Replace.

3.

Check

resistor

R2.

Normal

5.

The machine's upper com-

resistance is 2 ohms.

Refer to

partment could be dirty, blow

4.

wiring diagram.

R7.

Normal

out the upper compartment

Check

resistor

resistance is 5 ohms. Refer to

with compressed air.

wiring diagram.

5.

Check the two "jump-start"

diodes mounted on a plastic

board just in front of the shunt.

Refer to wiring diagram.

6. If check 3, 4,

and 5

are

OK,

the 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