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SQUARE WAVE TIG 355
F-30 F-30
INPUT CONTACTOR TEST (continued)
TROUBLESHOOTING & REPAIR
• 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.