Lincoln Electric IDEALARC R3R-300 Service Manual page 46

F-12
FIGURE F.2 – AC COIL INPUT CONTACTOR TEST POINT LOCATIONS
REMOVED)
TEST FOR CONTACT CONTINUITY
1. Disconnect the main input supply power to
the machine.
2. Remove the three leads connected to the
input contactor coil, #233 and X1/#232. See
Figure F.2 for location.
3. Using the external 120VAC supply, apply
120VAC to the terminals of the input con-
tactor coil. If the contactor does NOT acti-
vate, the input contactor is faulty. Replace
the input contactor.
TROUBLESHOOTING & REPAIR
INPUT CONTACTOR TEST (continued)
IDEALARC R3R
4. With the contactor activated, check the con-
tinuity across the contacts. (Zero ohms or
very low resistance is normal.) See Figure
F.2. If the resistance is high, the input con-
tactor is faulty. Replace the input contactor.
5. When the contactor is NOT activated, the
resistance should be infinite or very high
across the contacts. If the resistance is low,
the input contactor is faulty. Replace the
input contactor.
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