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F-3

 

TROUBLESHOOTING & REPAIR

F-3

 

 

 

PC BOARD TROUBLESHOOTING PROCEDURES

 

 

 

 

WARNING

- Remove the PC board from the static-shielding bag

 

 

 

and place it directly into the equipment. Donʼt set the

 

 

 

ELECTRIC SHOCK

PC board on or near paper, plastic or cloth which

 

 

 

can kill.

could have a static charge. If the PC board canʼt be

 

Have

an electrician install and

installed immediately, put it back in the static-shield-

 

ing bag.

 

 

 

 

service this equipment. Turn the

- If the PC board uses protective shorting jumpers,

 

 

 

input

power OFF at the fuse box

 

 

 

before working on equipment. Do

donʼt remove them until installation is complete.

 

 

 

 

not touch electrically hot parts.

- If you return a PC board to The Lincoln Electric

 

 

 

CAUTION

Company for credit, it must be in the static-shielding

 

 

 

bag. This will prevent further damage and allow prop-

 

 

 

er failure analysis.

 

 

Sometimes machine failures appear to be due to PC

4. Test the machine to determine if the failure

 

board failures. These problems can sometimes be

symptom has been corrected by the

 

traced to poor electrical connections. To avoid prob-

replacement PC board.

 

 

lems when troubleshooting and replacing PC boards,

NOTE: It is desirable to have a spare (known good)

 

please use the following procedure:

 

1. Determine to the best of your technical ability

PC board available for PC board troubleshooting.

 

NOTE: Allow the machine to heat up so that all

 

that the PC board is the most likely component

 

causing the failure symptom.

electrical components can reach their operating

 

2. Check for loose connections at the PC board

temperature.

 

 

5. Remove the replacement PC board and

 

to assure that the PC board is properly

substitute it with the original PC board to

 

connected.

 

 

recreate the original problem.

 

 

3. If the problem persists, replace the suspect PC

a. If the original problem does not reappear by

 

board using standard practices to avoid static

substituting the original board, then the PC

 

electrical damage and electrical shock. Read

board was not the problem. Continue to look

 

the warning inside the static resistant bag and

for bad connections in the control wiring

 

perform the following procedures:

harness, junction blocks, and terminal strips.

 

PC board can be damaged by static electricity.

b. If the original problem is recreated by the

 

 

 

- Remove your bodyʼs static

substitution of the original board, then the

 

 

 

 

 

 

charge before opening the static-

PC board was the problem. Reinstall the

 

 

 

shielding bag. Wear an anti-static

replacement PC board and test the machine.

 

 

 

wrist strap. For safety, use a 1

6. Always indicate that this procedure was

 

ATTENTION

 

Meg ohm resistive cord connected

followed when warranty reports are to be

 

 

to a grounded part of the

submitted.

 

 

Static-Sensitive

 

equipment frame.

NOTE: Following this procedure and writing on the

 

Devices

 

- If you donʼt have a wrist strap,

 

Handle only at

 

touch an un-painted, grounded,

warranty report, “INSTALLED AND SWITCHED PC

 

Static-Safe

 

part of the equipment frame. Keep

BOARDS TO VERIFY PROBLEM,” will help avoid

 

Workstations

 

touching the frame to prevent

denial of legitimate PC board warranty claims.

 

 

 

 

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.

 

 

Page 31
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Lincoln Electric SVM176-A service manual Troubleshooting & Repair, PC Board Troubleshooting Procedures, Electric Shock

SVM176-A specifications

The Lincoln Electric SVM176-A is a robust and versatile semiautomatic wire feeder designed to cater to a wide range of welding applications. Known for its reliability and ease of use, the SVM176-A is particularly favored in both industrial and construction settings, where efficiency and performance are paramount.

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