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F-44

F-44

TROUBLESHOOTING & REPAIR

STATIC SCR/DIODE RECTIFIER BRIDGE TEST (continued)

FIGURE F.16 – HEAT SINK AND SCR TEST POINTS

DIODE DD

DIODES DA, DB, DC

REMOVE

ANODE

INSULATING PAINT

 

 

CATHODE

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9.Remove the red insulating paint from the heat sink test points. See Figure F.16.

NOTE: Do not disassemble the heat sink.

10.Measure the resistance from the anode to the cathode of SCR A, using an analog volt/ohmmeter (multimeter) set at R x 1000 scale. See Figure F.16.

a.Reverse the meter leads and measure the resistance from the cathode to the anode of SCR A. See Figure F.16.

b.If a low resistance is measured in either meter polarity, SCR A is faulty. Replace SCR A.

11.Test the resistance of SCR B and SCR C using the same procedure described in Step 10.

12.Measure the resistance of diode DD from anode (+probe) to cathode (-probe) using an analog ohmmeter set at R x 1000 scale. The resistance should be low. See Figure F.16.

a.Reverse the meter leads and measure the resistance from cathode (+probe) to anode (-probe) of diode DD. The resis- tance should be high. See Figure F.16.

b.If a low resistance is measured in both meter polarities, diode DD is shorted. Replace diode DD.

c.If a high resistance is measured in both meter polarities, diode DD is open. Replace diode DD.

13.Test diodes DA, DB and DC for proper oper- ation using the same procedure described in Step 12.

14.Reconnect all leads and molex plugs.

15.If this test did not identify the problem or to further test the SCRs, go to the Active SCR

Test.

If the test is complete, connect plug J6 to the control board and plug J30 to the snubber board and reconnect lead #204B to resistor R1. Replace the covers to the two boards. Replace all case covers. (See the Case Cover Removal and Replacement proce- dure.)

COMMANDER 400

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Lincoln Electric SVM133-B service manual Test

SVM133-B specifications

The Lincoln Electric SVM133-B is an innovative welding machine designed to meet the diverse needs of welders and fabrication shops. This versatile equipment combines state-of-the-art technology with user-friendly features, making it ideal for both novice and professional welders.

One of the main features of the SVM133-B is its advanced inverter technology. This allows for a more efficient power delivery, which translates into reduced energy consumption and lower operational costs. The machine is capable of delivering optimal welding performance across a range of materials, from thin sheets to heavier sections, making it suitable for various applications in industries such as automotive, construction, and repair.

The SVM133-B supports multiple welding processes, including MIG, stick, and TIG welding. This flexibility ensures that users can adapt to various job requirements without needing multiple machines. The intuitive control panel allows users to switch between modes effortlessly, providing a seamless welding experience.

Another notable characteristic of the SVM133-B is its compact and lightweight design. Weighing significantly less than traditional welding machines, it is highly portable, making it easy to transport to different job sites. Additionally, its rugged construction ensures durability, allowing it to withstand tough working conditions.

The SVM133-B is equipped with advanced safety features, such as overheat and overload protection, which safeguard both the machine and the user during operation. It also includes a digital display that provides real-time feedback on settings, voltage, and amperage, which enhances precision and control during welding tasks.

Lincoln Electric has prioritized ease of use in the SVM133-B, with quick setup guides and clear instructions. This user-centric approach not only facilitates a smoother learning curve for beginners but also optimizes the workflow for experienced welders, enabling them to maximize productivity.

One of the standout features is the capability to weld aluminum with ease, thanks to its spool gun compatibility. This feature sets the SVM133-B apart from many competitors, providing added value for users who require flexibility in their welding projects.

In summary, the Lincoln Electric SVM133-B stands out in the welding machine market due to its inverter technology, multi-process capabilities, portability, and robust safety measures. It embodies the perfect blend of innovation and practicality, making it a top choice for welders looking to enhance their skills and productivity across a wide array of applications. Whether for professional use or hobbyist projects, the SVM133-B offers a reliable solution for high-quality welding tasks.