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F-33F-33

TROUBLESHOOTING & REPAIR

CONTROL BOARD TEST (Continued)

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10.LED 6 indicates that the fan motor driver circuit has been activated and the fan motor should be running. LED 6 and the fan motor will be on for about 5 minutes after LED 4 goes off. See Figure F.15.

11.LED 7 will light if a positive voltage is pre- sent on the negative output terminal (AC instead of DC). This is an indiction of a shorted SCR in the output bridge rectifier. See SCR Rectifier Bridge Test. The input contactor will open and will remain deenergized until the power switch is turned off for a minimum of 1 second. See Figure F.15.

12.The green light, located on the front con- trol panel, is lit when the machine’s output voltage is present and at a safe level. The voltage range is from 40VDC to 113VDC peak. This voltage can be measured at the output terminals and verified at Plug J1-pin 6(+) lead #215 to Plug J2-pin 1(-) lead #222D. See Figure F.15. If the output voltage is within range but the green light is not lit either the green light is faulty or the control board is faulty. Normal operat- ing voltage for the green light is about 3.5VDC. A voltage of about 5.0VDC would indicate the light is open and the control board circuit is operating correctly.

This can be measured at Plug J1-pin 16(+) lead #232 to Plug J1-pin 15(-) lead #233. See Figure F.15.

13.The yellow (amber) light, located on the front panel, will light if the “open thermo- stat” (secondary and SCR heat sink) sig- nal is sent to the fan control and output disable circuits. The voltage on the two thermostat circuit is from 24VDC to 38VDC. This voltage is dependent upon the input voltage applied to the Multi- Source. This voltage can be verified at Plug J1-pin 3(+) lead #263 to Plug J1-pin 11(-) lead #264. This voltage will be pre- sent if only one of the thermostats are open or an associated lead is disconnect- ed. See the Wiring Diagram. Normal operating voltage for the amber light is about 2.2VDC. A voltage reading of about 5.0VDC would indicate the amber light is open and the control board is supplying the correct signal. This can be verified at Plug at Plug J1-pin 13(+) lead #234 to plug J1-pin 12(-) lead #235. This light voltage will normally be present ONLY when the thermostat circuit is open. See the Wiring Diagram. See Figure F.15.

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FIGURE F.15. Control Board with LED, Plug and Lead Locations

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#274 #273 #222D

J2

#341 #230 #215 #231 #263

#201 J1

CONTROL BOARD

#232

#233

#234

#235

#264 #222A

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J3

MULTI-SOURCE

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Lincoln Electric SVM155-A service manual #341 #230 #215 #231 #263 #201 J1

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.