Troubleshooting, Caution – Lincoln Electric IM609 SQUARE WAVE TIG 275 User Manual

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TROUBLESHOOTING

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SQUARE WAVE TIG 275

Observe all Safety Guidelines detailed throughout this manual

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local
Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

CAUTION

GENERAL MACHINE TROUBLE

PROBLEMS

(SYMPTOMS)

POSSIBLE AREAS OF

MISADJUSTMENTS(S)

RECOMMENDED

COURSE OF ACTION

The machine makes a very loud
buzzing noise in DC stick, or in DC
TIG when the Arc Start Switch or
Amptrol is pressed.

The machine has output and the
meters are “ON” but there is no high
frequency present and the gas sole-
noid does not function.

High frequency is present, but bad
starting at low currents.
(Approximately 15 Amps and below)

Stick electrode "Blasts Off" when
touched to the work piece.

Cannot adjust AC Wave Balance.

Variable or sluggish welding arc.

1. Diode D1 may be shorted. Check

and replace.

2. One of the main SCR’s may be

shorted. Check and replace.

1. Check and replace 5 Amp Fuse

(F1) located below the Control PC
Board on the right. (Fuse is pre-
sent on European models only)

1. Check and replace 5 Amp Fuse

(F2) located below the Control PC
Board on the left. (Fuse is present
on European models only)

1. Weld current is set too high for

electrode size. Reduce the preset
current.

2. One of the main SCR’s may be

shorted.

3. The Control PC Board may be

faulty.

See PC Board

Troubleshooting Procedures.

1. AC Wave Balance Function is only

operational in the AC TIG mode.

2. The Control PC Board may be

faulty.

See PC Board

Troubleshooting Procedures.

1. Poor work or electrode connec-

tion.

2. Welding leads too small.

Use

larger work and electrode leads

3. Welding current set too low.

Contact your Local Lincoln Authorized
Field Service Facility for technical
troubleshooting assistance.

APR96

STICK WELDING TROUBLE