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TROUBLESHOOTING & REPAIR
INPUT CONTACTOR TEST (continued)
•If 120 VAC is present when the Start button is held in but the contactor does not stay activated when the button is released, check the CR1 interlock, the power Start/Stop pushbutton, and associated circuitry. See Figure F.6, Input Contactor (CR1) Simplified Control Circuit. Also perform the Control Board Test.
Test for Contact Continuity
1.Remove ALL input power to the machine.
2.Perform the power factor capacitor dis- charge procedure.
3.Locate the two leads, #243 and #244, con- nected to the input contactor coil. See Figure F6.
4.Use the external 120 VAC supply to apply power to the input contactor coil.
•If the contactor does NOT activate, it is faulty. Replace.
•If the contactor does activate, check the continuity across the contacts. A normal reading should be zero ohms or very low ohms.
•If the resistance is high, the contactor is faulty. Replace.
5.With the contactor NOT activated, check the continuity across the contacts. See Figure F.6.
•If the resistance is infinite or very high across the contacts, the contactor is good.
•If the resistance is low, the contactor is faulty. Replace.
6.After the tests are completed and the prob- lem repaired, install the machine sides and top, using the 5/16" nut driver.
SQUARE WAVE TIG 355
