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E-4
TROUBLESHOOTING
E-4
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.
Contact your Local Lincoln Authorized
Field Service Facility for technical
troubleshooting assistance.
APR96
STICK WELDING TROUBLE