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PROCEDURE FOR REPLACING PC BOARDS
Before replacing a PC board which is suspected of
being defective, visually inspect the PC board in ques-
tion for any damage to any of its components and
conductors on the back of the board.
If there is no visible damage to the PC board, install a
new one and see if this remedies the problem. If the
problem is remedied, reinstall the old PC board to see
if the problem still exists. If it does no longer exist
with the old PC board:
1. Check the PC board harness conductor pins for
corrosion, contamination or looseness.
2. Check leads in the plug harness for loose or
intermittent connection.
If PC board is visibly damaged electrically (compo-
nents burned, copper traces opened or damaged),
before possibly subjecting the new PC board to the
same cause of failure, check for possible shorts,
opens or grounds caused by:
1. Frayed or pinched lead insulation.
2. Poor lead termination, such as a poor contact or
a short to adjacent connection or surface.
3. Two or more leads shorted together.
4. Foreign matter or interference behind the PC
boards.
If PC board is visibly damaged mechanically (such
as a part vibrated off or was crushed), inspect for
cause, then remedy before installing a replacement
PC board.
If there is damage to the PC board if replacing PC
board corrects problem, return it to the local Lincoln
Electric Field Service Shop.
ELECTRIC SHOCK CAN KILL.
BEFORE PERFORMING ANY MAINTE-
NANCE THAT REQUIRES OPENING
THE CASE OF THE POWER SOURCE:
• Disconnect input power to this machine at the
Disconnect switch.
• Do not touch electrically live parts or internal wiring.
• Only qualified personnel should service this
machine.
------------------------------------------------------------------------
WARNING