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F-4

TROUBLESHOOTING AND REPAIR

F-4

 

 

Observe Safety Guidelines detailed in the beginning of this manual.

 

 

 

 

 

 

 

 

 

 

PROBLEMS

 

 

POSSIBLE AREAS OF

 

RECOMMENDED

 

(SYMPTOMS)

 

 

MISADJUSTMENT(S)

 

COURSE OF ACTION

 

 

 

 

 

 

 

 

 

 

 

OUTPUT PROBLEMS

 

 

 

Machine is dead. No output - No

1.

Make sure that the input power

1.

Check the input power switch

 

fan - No 115 VAC at receptacle.

 

switch is in the "ON" position

 

and associated wires for loose

 

 

 

and the machine is plugged in.

 

or faulty connections.

 

 

 

2.

Check the input voltage at the

2.

Perform the T1 Transformer

 

 

 

 

machine. Input voltage must

 

Test.

 

 

 

 

match the rating plate and volt-

 

 

 

 

 

 

age connection. Refer to

 

 

 

 

 

 

Reconnect Procedure in the

 

 

 

 

 

 

Installation section of this manu-

 

 

 

 

 

 

al.

 

 

 

 

 

3. Blown or missing fuses in the

 

 

 

 

 

 

input line.

 

 

 

 

 

4. CB-1 circuit breaker open.

 

 

 

 

 

 

 

 

 

The fan runs normally. No output

1.

Check for proper input voltages

1.

Check for loose or faulty con-

 

from the machine in either Stick or

 

per nameplate and voltage

 

nections on the heavy current

 

TIG modes.

 

 

reconnect configuration.

 

carrying leads. (polarity switch,

 

 

 

 

 

output choke output terminals

 

 

 

2.

Check to make sure the polarity

 

etc.)

 

 

 

 

switch is in the proper position

 

 

 

 

 

 

and functioning correctly.

2.

Perform the T1 Transformer

 

 

 

 

 

 

Test.

 

 

 

 

 

3. Perform the SCR Bridge Test.

 

 

 

 

4. Check current control R1 for

 

 

 

 

 

 

proper operation. Normal

 

 

 

 

 

 

resistance is 10,000 ohms.

 

 

 

 

 

 

Also check associated leads

 

 

 

 

 

 

for loose or faulty connections.

 

 

 

 

5. The control board may 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 1-888-935-3877.

PRECISION TIG® 225

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Lincoln Electric SVM186-A service manual Perform the T1 Transformer

SVM186-A specifications

The Lincoln Electric SVM186-A is a versatile and highly efficient welding machine that stands out in the competitive landscape of industrial welding equipment. Designed to meet the needs of both professionals and hobbyists, this machine combines advanced technology with robust construction, delivering outstanding performance in various welding applications.

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