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F-25

F-25

TROUBLESHOOTING & REPAIR

GAS (WATER) SOLENOID TEST (continued)

FIGURE F.3 – GAS SOLENOID LOCATION

LEFT SIDE

INTERNAL

PANEL

GAS

SOLENOID

CASE BACK

CONTROL

BOARD

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TEST PROCEDURE

1.Remove input power to the TIG 275 machine.

2.Remove the left case side.

3.Perform the High Frequency Circuit

Disable Procedure.

4.Locate the gas solenoid. See Figure F.3.

5.Put the mode switch S3 in the 2-Step TIG position.

WARNING

ELECTRIC SHOCK can kill.

With input power ON, there are high voltages inside the machine. Do not reach into the machine or touch any internal part.

6.Apply the correct input power to the TIG 275.

7.Activate the torch trigger and check for approximately 115 VAC at the solenoid

leads (#234 and #235). If the correct volt- age is present, the solenoid should activate and gas should flow.

8.If voltage is present at leads #234 and #235 and the solenoid does not activate, the solenoid may be defective. The solenoid can be further checked by removing leads #234 and #235 from the solenoid and applying the external isolated 115 VAC sup- ply to the solenoid terminals. If the solenoid activates with the external supply but not when powered by the control board, the problem may be in the control board. If you hear solenoid activation but there is still no gas flow, check for restrictions in the line.

9.When the test is complete, replace leads #234 and #235.

10.Reassemble the two leads previously removed in the High Frequency Circuit

Disable Procedure.

11.Reassemble the left case side.

12.If a water solenoid is used, it can be tested using the same procedures.

SQUARE WAVE TIG 275

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Lincoln Electric SVM141-A service manual GAS Water Solenoid Test, Figure F.3 GAS Solenoid Location

SVM141-A specifications

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