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('"! Sometimes machine failures appear to be
due to P.C. board failures. These problems can some-
times be traced to poor electrical connections. To
avoid problems when troubleshooting and replacing
P.C. boards, please use the following procedure:
1. Determine to the best of your technical ability that
the P.C. board is the most likely component caus-
ing the failure symptom.
2. Check for loose connections at the P.C. board to
assure that the P.C. board is properly connected.
3. If the problem persists, replace the suspect P.C.
board using standard practices to avoid static elec-
trical damage and electrical shock. Read the warn-
ing inside the static resistant bag and perform the
following procedures:
#<.?10.;/21.:.421/F@A.A602920A?606AF
• Remove your body’s static
charge before opening the static-
shielding bag. Wear an anti-static
wrist strap. For safety, use a 1
Meg ohm resistive cord connect-
ed to a grounded part of the
equipment frame.
• If you don’t have a wrist strap,
touch an unpainted, grounded,
part of the equipment frame.
Keep touching the frame to pre-
vent static build-up. Be sure not
to touch any electrically live parts
at the same time.
• Tools which come in contact with the P.C. Board
must be either conductive, anti-static or static-dis-
sipative.
• Remove the P.C. Board from the static-shielding
bag and place it directly into the equipment. Don’t
set the P.C. Board on or near paper, plastic or
cloth which could have a static charge. If the P.C.
Board can’t be installed immediately, put it back in
the static-shielding bag.
• If the P.C. Board uses protective shorting jumpers,
don’t remove them until installation is complete.
• If you return a P.C. Board to The Lincoln Electric
Company for credit, it must be in the static-shield-
ing bag. This will prevent further damage and
allow proper failure analysis.
4. Test the machine to determine if the failure symp-
tom has been corrected by the replacement P.C.
board.
!"' It is desirable to have a spare (known good)
P.C. board available for P.C. board troubleshooting.
!"' Allow the machine to heat up so that all electri-
cal components can reach their operating tem-
perature.
5. Remove the replacement P.C. board and substitute
it with the original PC board to recreate the original
problem.
• If the original problem does not reappear by substi-
tuting the original board, then the PC board was not
the problem. Continue to look for bad connections
in the control wiring harness, junction blocks, and
terminal strips.
• If the original problem is recreated by the substitu-
tion of the original board, then the PC board was
the problem. Reinstall the replacement PC board
and test the machine.
6. Always indicate that this procedure was followed
when warranty reports are to be submitted.
!"' Following this procedure and writing on the
warranty report, “INSTALLED AND SWITCHED PC
BOARDS TO VERIFY PROBLEM,” will help avoid
denial of legitimate PC board warranty claims.
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