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F-58F-58

TROUBLESHOOTING & REPAIR

SCR BRIDGE / HEAT SINK ASSEMBLY REPLACEMENT PROCEDURE

INSTALLATION OF SCR OUTPUT

BRIDGE

NOTE: Upon reassembly, apply a thin layer of Lincoln T12837 (Dow Corning #340) heat sink compound to all bolted elec- trical connections on the aluminum heat sinks, including positive buss bar.

1.Carefully maneuver SCR bridge back into original position.

2.Using a solder iron, reconnect lead #251 to the main transformer and insulate.

3.Replace the two 9/16” mounting bolts pre- viously removed. Be sure to position insu- lation, bushing, washer, and nut correctly.

See Figure F.26.

4.Replace the two 1/2” mounting bolts on the right side of the machine previously removed. These bolts mount the SCR bridge to the main transformer. See

Figure F.27.

5.Replace any previously removed cable ties.

6.Replace the 3/8” mounting screw previ- ously removed from the front of the machine located behind the control panel.

7.Reconnect plug J4 to the firing board.

8.Replace the four screws previously removed from the front control panel.

9.Reconnect the six copper transformer sec- ondary leads previously removed.

10.Reconnect the two positive output leads to the shunt.

11.Reconnect leads #264 and #301 previous- ly removed from the thermostat.

12.Replace the case sides and roof.

MULTI-SOURCE

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Image 86
Lincoln Electric SVM155-A service manual See Figure F.26, Figure F.27

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.

One of the main features of the SVM155-A is its robust power output, which can handle welding materials ranging from thin sheets to heavier stock. The welder offers a high duty cycle, ensuring that users can work efficiently without the need for prolonged breaks. This is especially important in industrial settings where productivity is key. Additionally, the SVM155-A is equipped with a digital display that allows for easy monitoring and precise control of the welding parameters, ensuring consistency in weld quality.

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.

Another standout characteristic of the SVM155-A is its exceptional arc stability and ease of use. The machine is designed to provide a smooth and consistent arc, reducing spatter and ensuring clean welds. Moreover, the welder is compatible with a wide range of materials, including stainless steel, aluminum, and carbon steel, further enhancing its versatility.

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.