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. Perform the Range Switch

Test.

2. Perform the Fine Control

Potentiometer Test.

3. Check for poor connections at

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

4. Check for poor connections at

J4 pins 1, 2, 3, 6, & 7 at the con-
trol board. Also, perform the
Exciter Voltage Feedback
Test.

5. Check for poor connections

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

6. Check for poor connections

along lead #204A at the diode
bridge and at J6 pin 4 molex
plug at the control board. This
is control board common.

Check for poor connection
along lead #208 at the negative
CV output stud and at J21 pin 6
molex plug at the CV daughter
board. This is CV voltage feed-
back input. Will not affect weld-
ing in the general fab or pipe
taps.

8. Check for poor connection at

J21 pins 1 & 4 at the CV daugh-
ter board. This is CVSCR gate
drive output. Will not affect
welding in the general fab or
pipe taps.

9. Check the weld & CV chokes (if

so equipped) for turn to turn
shorts.

COMMANDER 400

WELDING PROBLEMS

TROUBLESHOOTING GUIDE

Observe Safety Guidelines

detailed in the beginning of this manual.

PROBLEMS
(SYMPTOMS)

POSSIBLE AREAS OF
MISADJUSTMENT(S)

RECOMMENDED
COURSE OF ACTION

CAUTION

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).

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