Lincoln Electric LN-742H - Manual (Page 34)

E-1 TROUBLESHOOTING E-1
LN-742 & LN-742H
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
This Troubleshooting Guide is provided to
help you locate and repair possible machine
malfunctions. Simply follow the three-step
procedure listed below.
Step 1. LOCATE PROBLEM (SYMPTOM).
Look under the column labeled “ PROBLEM
(SYMPTOMS) ” . This column describes
possible symptoms that the machine may
exhibit. Find the listing that best describes
the symptom that the machine is exhibiting.
Step 2. POSSIBLE CAUSE.
The second column labeled “ POSSIBLE
CAUSE ” lists the obvious external possibili-
ties that may contribute to the machine
symptom.
Step 3. RECOMMENDED COURSE OF
ACTION
This column provides a course of action for
the Possible Cause, generally it states to
contact you local Lincoln Authorized Field
Service Facility.
If you do not understand or are unable to
perform the Recommended Course of
Action safely, contact you local Lincoln
Authorized Field Service Facility.
HOW TO USE TROUBLESHOOTING GUIDE
Service and Repair should only be performed by Lincoln Electric Factory Trained Personnel.
Unauthorized repairs performed on this equipment may result in danger to the technician and
machine operator and will invalidate your factory warranty. For your safety and to avoid
Electrical Shock, please observe all safety notes and precautions detailed throughout this
manual.
__________________________________________________________________________
WARNING
WARNING
ELECTRIC SHOCK can kill.
• Do not touch electrically live parts such as
internal wiring.
• Only qualified personnel should install, use or ser-
vice this equipment.