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

PROBLEMS
(SYMPTOMS)

POSSIBLE AREAS OF
MISADJUSTMENT(S)

RECOMMENDED
COURSE OF ACTION

FUNCTION PROBLEMS

The welding arc is “cold.” The
engine runs normally. The auxiliary
power is normal.

1. Check for loose or faulty con-

nections at the weld output ter-
minals and welding cable con-
nections.

2. The welding cables may be too

long or coiled, causing an
excessive voltage drop.

3. Check to make sure that the

machine settings match the
weld application.

4. If a remote control unit is not

connected to the machine, make
sure the Local/Remote switch
(S1) is in the “LOCAL” position.

5. If the remote control unit is con-

nected, and the machine oper-
ates normally when the switch is
in the “LOCAL” position, the
remote control cable or unit may
be faulty. Check or replace.

1. Using a voltmeter, check for the

correct OCV at the weld termi-
nals. If the correct voltage is
present, then check for loose
connections on the heavy cur-
rent carrying leads inside the
machine. See the Wiring
Diagram.

2. If the OCV is low, perform the

Engine Throttle Adjustment
Test.

3. Perform the SCR/Diode Bridge

Test.

4. Perform the Stator Voltage Test.

5. Perform the Range Switch Test.

6. Perform the Fine Control

Potentiometer Test.

7. Check fro poor connections at

the J1 molex plug at the control
board and at the shunt. Also,
perform the Shunt Calibration
Test.

Check for poor connections
along lead #204A at the diode
bridge and at J6 pin 4 molex at
the control pc board. This is
control board common.

9. Check for poor connections at

J6 pins 1, 2 & 3 molex plug at
the control board. Also check
leads G1, G2 & G3 to each
SCR. These are SCR gate drive
outputs.

10.

Check for poor connections
along lead #207 at the negative
CC output stud, and at the J6
pin 10 molex plug at the control
board. This is CC arc voltage
feedback input. Will not affect
welding in the CV tap.

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