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SVM7007 TROUBLESHOOTING AND REPAIR E‐3
ELECTRIC SHOCK can kill.
Have an electrician install and service this equipment. Turn the input power OFF at the fuse box before
working on equipment. Do not touch electrically hot parts.
Sometimes machine failures appear to be due to PC board failures. These problems can sometimes be traced to poor
electrical connections. To avoid problems when troubleshooting and replacing PC boards, please use the following
procedure:
1. Determine to the best of your technical ability that the PC board is the most likely component causing the
failure symptom.
2. Check for loose connections at the PC board to assure that the PC board is properly connected.
3. If the problem persists, replace the suspect PC board using standard practices to avoid static electrical
damage and electrical shock. Read the warning inside the static resistant bag and perform the following
procedures:
PC board can be damaged by static electricity.
ATTENTION
Static‐
Sensitive
Devices
Handle only
at Static‐Safe
Workstations
Reusable
Container
Do Not
Destroy
4. Test the machine to determine if the failure symptom has been corrected by the replacement PC board.
NOTE: Allow the machine to heat up so that all electrical components can reach their operating temperature.
5. Remove the replacement PC board and substitute it with the original PC board to recreate the original problem.
If the original problem does not reappear by substituting 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 substitution 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.
NOTE: 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.
PC BOARD TROUBLESHOOTING PROCEDURES
WARNING
‐ 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 connected to
a grounded part of the equipment frame.
‐ If you don't have a wrist strap, touch an un‐painted, grounded, part of the
equipment frame. Keep touching the frame to prevent static build‐up. Be sure not
to touch any electrically live parts at the same time.
‐ Tools which come in contact with the PC board must be either conductive, anti‐
static or static‐dissipative.
‐ Remove the PC board from the static‐shielding bag and place it directly into the
equipment. Don't set the PC board on or near paper, plastic or cloth which could have a
static charge. If the PC board can't be installed immediately, put it back in the static‐
shielding bag.
‐ If the PC board uses protective shorting jumpers, don't remove them until installation is
complete.
‐ If you return a PC board to The Lincoln Electric Company for credit, it must be in the
static‐shielding bag. This will prevent further damage and allow proper failure analysis.
OPTIMARC
CAUTION
®
CV/CC500
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