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F-36F-36

TROUBLESHOOTING & REPAIR

FIRING BOARD TEST (Continued)

FIGURE F.16. FIRING BOARD LOCATION

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J5

J6

J7

J8

J4

Firing Board

TEST PROCEDURE FOR NORMAL FIRING BOARD OPERATION

1.Disconnect main AC input power to the machine.

2.Remove screws, loosen and lower the front panel to access the firing board on the left side of control box while facing the machine. See Figure F.16.

3.Visually inspect the Firing Board for loose or faulty connections and obvious physi- cal damage.

J2

J1

J3

Control Board

NOTE: To verify that the control board is sending the correct output enable signal to the firing board, check from plug J8, pin 7(+) (lead #340) to plug J5, pin 12 (-) (lead #215). See Figure F.17. See the wiring diagram. Normal voltage is approximately less than 1.0 VDC. If not correct the control board may be faulty.

7.Locate LEDs 1 thru 6. Each LED should glow with equal brightness.

NOTE: LEDs 1 through 6 indicate that the gate firing signals are being generated to send to each of the output SCRs.

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WARNING

Electric Shock can kill.

With the input power on, there are high voltages inside the machine. Use caution when reaching into the

machine or touching any internal part of the machine while the power is on. High voltage is present.

4.Reconnect the input power and turn the MULTI-SOURCE on.

5.Locate LEDs 7, 8, and 9 on the Firing Board. See Figure F.17. Each LED should be ON and equally bright. Use Table F.2 to check LED operation.

6.Make certain that plug J7 (jumper plug) is in place. See Figure F17. and the wiring diagram.

8.If LED 2, located on the control board, is bright along with LEDs 7,8 and 9 on the Firing Board and LEDs 1 through 6 are unequal in brightness, check to make sure lead #231 is not loose or broken. See the wiring diagram. Normal voltage range at plug J5, pin 13 (+) (lead #231) to plug J5, pin 12 (-) (lead #215) is 3 to 13 VDC. At an open circuit condition the normal voltage is approximately 10 VDC. See

Figure F.17.

9.If one or two of the LEDs 1 through 6 are dimmer or brighter than the others, this could indicate an open or shorted gate on an output SCR. Perform the

Static and Active SCR Tests.

MULTI-SOURCE

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Lincoln Electric SVM155-A service manual Figure F.17, Static and Active SCR Tests

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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The European-designed INVERTER technology embedded in the SVM155-A significantly contributes to its lightweight and compact design. Weighing in at only 19.4 lbs, this welder is portable and ideal for fieldwork or workshops where space is limited. The inverter technology not only reduces the size and weight but also improves energy efficiency, leading to lower operational costs over time.

The SVM155-A also features advanced safety mechanisms, including over-current protection to safeguard the machine from potential damage during excessive use. It also includes a thermal overload shut-off, which prevents overheating, ensuring a longer lifespan for the welder.

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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.