Lincoln Electric IM10018-A Board can be damaged by static electricity, Static-Sensitive, Devices

E-2	TROUbLESHOOTING	E-2
	P.C. bOARD TROUbLESHOOTING PROCEDURES

WARNING

ELECTRIC SHOCK can kill.

Have an electrician install and ser- vice this equipment. Turn the input power OFF at the fuse box before working on equipment. Do not touch electrically hot parts.

CAUTION: 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:

P.C. board can be damaged by static electricity.

•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.

NOTE: It is desirable to have a spare (known good) P.C. board available for P.C. board troubleshooting.

NOTE: 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.

ATTENTION

Static-Sensitive

Devices

Handle only at

Static-Safe

Workstations

Reusable

Container

Do Not Destroy

•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.

• 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.

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.

•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.

IDEALARC® DC-600 VRD