Service and repair should be performed by only Lincoln Electric factory trained personnel.
Unauthorized repairs performed on this equipment may result in danger to the technician or
machine operator and will invalidate your factory warranty. For your safety and to avoid elec-
trical shock, please observe all safety notes and precautions detailed throughout this manual.

If for any reason you do not understand the test procedures or are unable to perform the
test/repairs safely, contact the Lincoln Electric Service Department for electrical trou-
bleshooting assistance before you proceed. Call 1-800-833-9353 (WELD).

DESCRIPTION

The following tests and procedures must be performed if the main power FET module has
been replaced in the Power Wave. These tests are necessary to ensure that the FET
module has been installed and connected properly.

BEWARE:

ISOLATED POWER SUPPLIES AND METERING MUST BE USED: CATASTROPHIC PC
BOARD DAMAGE WILL OCCUR IF THE VOLTAGE SUPPLIES AND METERING ARE NOT
COMPLETELY ELECTRICALLY ISOLATED.

MATERIALS NEEDED

Calibration and Test Overlay

L9660-255

Isolation transformer (for oscilloscope)
Isolation transformer 115vac @ 3 amps (min)

circuit of figure #1

Isolation transformer 115vac @ 2 amps (min)

circuit of figure #3

Variable transformer 3 amps (min)
Oscilloscope
*Current probe

Tektronic P6201
or equivalent

Voltmeters
Fuse 5 amps (2).
P70 adapter

Female connector

S18247-6

Male connector

S18249-6

Male pin

S8053-122

Female pin

S8053-123

P23 adapter

Male connector

S18247-6

Female pin

S8053-123

Toggle switch (SPST)

*An alternate method of testing using an isolated oscilloscope may be used.

WARNING

This procedure takes approximately 2 hours to perform.