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Lincoln Electric SVM148-B Output Rectifier Bridge Test, Conduct this test with the engine off

Models: SVM148-B

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TROUBLESHOOTING & REPAIR

OUTPUT RECTIFIER BRIDGE TEST (continued)

FIGURE F.2 – LOCATION OF OUTPUT RECTIFIER DIODE LEADS

Left side (–)

 

Right side (+)

 

 

 

 

 

 

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TEST PROCEDURE

1.Conduct this test with the engine off.

2.Using the 3/8” wrench, remove the sheet metal screws from the right and left front case sides.

3.Carefully remove the right and left front case sides.

4.Locate the two halves of the output rectifi- er. The negative plate is located on the lower left side of the machine behind the case front. The positive plate is located on the lower right side of the machine behind the case front. See Figure F.2.

5.Using the 1/2” wrench, remove the nuts and washers holding the diode pigtails and the heavy current-carrying leads to the studs on the rectifier plates. Note leads and pig- tail placement for reassembly.

6.Electrically isolate the diode pigtail leads by carefully bending them out into “free air.”

7.With an ohmmeter or diode tester, check each of the four diodes from their pigtails to their respective heat sinks.

8.Reverse the tester leads and check the diodes again. Diodes should have a low resistance in one polarity and a very high resistance in the opposite polarity.

9.Replace any “shorted” or “open” diode as the tests indicate. See the Diode

Removal and Replacement Procedure.

10.Replace the pigtails and heavy leads onto the correct studs. Assemble the washers and nuts.

11.Replace the left and right front case sides.

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RANGER 300 D AND 300 DLX

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Lincoln Electric SVM148-B service manual Output Rectifier Bridge Test, Conduct this test with the engine off
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SVM148-B specifications

The Lincoln Electric SVM148-B is a state-of-the-art inverter-based power source designed for both professional welders and hobbyists. As a versatile machine, it excels in a variety of welding applications including MIG, TIG, and stick welding. This machine is particularly notable for its efficiency and portability, making it an ideal choice for on-site projects or workshops where space is limited.

One of the main features of the SVM148-B is its inverter technology. Unlike traditional transformer-based welders, inverter welders are typically lighter and more compact. This means that users can transport the machine more easily without sacrificing power or performance. The SVM148-B is capable of delivering a substantial amperage range, allowing for adjustments that suit various materials and thicknesses, from thin sheet metal to thicker plates.

The machine offers adjustable output levels, providing precise control over the welding process. This level of control is essential for achieving clean, strong welds and is especially useful when working with different materials. The SVM148-B is equipped with digital display features that provide real-time feedback on power settings and welding parameters, allowing welders to make quick adjustments as needed.

Another significant advantage of the SVM148-B is its duty cycle, which is designed to accommodate extended usage without overheating. A robust duty cycle means that professionals can rely on this machine for prolonged periods, making it a dependable choice for heavy-duty tasks.

The SVM148-B also includes advanced safety features such as overload protection, which ensures that the machine will shut down in the event of excessive current draw. This feature not only protects the equipment but also enhances user safety during operation.

Moreover, the machine is compatible with a wide variety of welding wires and electrodes, adding to its versatility. Whether you're working with stainless steel, aluminum, or mild steel, the SVM148-B can adapt seamlessly.

In conclusion, the Lincoln Electric SVM148-B combines advanced inverter technology with user-friendly features, making it an invaluable addition to any welding setup. Its portability, control options, robust duty cycle, and safety measures set it apart as a reliable and efficient welding solution for professionals and hobbyists alike. Whether for a small workshop or large industrial applications, the SVM148-B meets the demands of modern welding with efficiency and ease.