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F-37

TROUBLESHOOTING & REPAIR

F-37

 

 

 

FIRING BOARD TEST (Continued)

TABLE F.2. - LED 7, 8 and 9 Check List

IF

THEN

LED 7 is ON

AC power is being supplied to the Firing Board from leads

 

#283 and #284 connected, through the resistor bank, to

 

the phase angle winding in the Main Transformer. See

 

Figure F.17.

 

Normal voltage at leads #283 to #284 is 25 VAC.

 

 

LED 7 is OFF or is DIM-

The proper AC voltage may not be reaching the Firing

MER than other LEDs

Board. Check for loose or faulty connections. Perform

 

Main Transformer Test. Also check resistors R3 and R4

 

located in the resistor bank. Normal resistance is 50

 

ohms.

 

 

LED 8 is ON

AC power is being supplied to the Firing Board from leads

 

#285 and #286 connected, through the resistor bank, to

 

the phase angle winding in the Main Transformer. See

 

Figure F.17.

 

Normal voltage at leads #285 to #286 is 25 VAC.

 

 

LED 8 is OFF or is DIM-

The proper AC voltage may not be reaching the Firing

MER than other LEDs

Board. Check for loose or faulty connections. Perform

 

Main Transformer Test. Also check resistors R5 and R6

 

located in the resistor bank. Normal resistance is 50

 

ohms.

 

 

LED 9 is ON

AC power is being supplied to the Firing Board from leads

 

#287 and #288 connected, through the resistor bank, to

 

the phase angle winding in the Main Transformer. See

 

Figure F.17.

 

Normal voltage at leads #287 to #288 is 25 VAC.

 

 

LED 9 is OFF or is DIM-

The proper AC voltage may not be reaching the Firing

MER than other LEDs

Board. Check for loose or faulty connections. Perform

 

Main Transformer Test. Also check resistors R7 and R8

 

located in the resistor bank. Normal resistance is 50

 

ohms.

 

 

MULTI-SOURCE

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Lincoln Electric SVM155-A service manual Table F.2. LED 7, 8 and 9 Check List, Then

SVM155-A specifications

The Lincoln Electric SVM155-A is a state-of-the-art welding machine that excels in versatility and performance, making it ideal for both professional welders and hobbyists. This multi-process welder supports MIG, TIG, and stick welding processes, allowing users to tackle a wide range of applications with a single device. Its user-friendly design and advanced technology make it an exceptional choice for those looking to enhance their welding capabilities.

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In conclusion, the Lincoln Electric SVM155-A is a powerful, durable, and multifunctional welding machine that incorporates advanced technologies to meet the needs of modern welding applications. Its portability, safety features, and ability to deliver high-quality welds make it an excellent investment for anyone looking to improve their welding skills or expand their capabilities in various welding projects.