Lincoln Electric IDEALARC DC-655 Service Manual page 76

F-34
#256
#255A
TEST FOR CONTACT CONTINUITY
1. Disconnect the main input supply power to
the DC-655 machine.
2. Locate, label and remove the three leads
connected to the input contactor coil
(X1/#256 and #255A). See Figure F.13.
3. Using the external 120 VAC supply, apply
120 VAC to the terminals of the input con-
tactor coil. If the contactor does NOT acti-
vate, the input contactor is faulty.
TROUBLESHOOTING & REPAIR
INPUT CONTACTOR TEST (continued)
FIGURE F.13 – INPUT CONTACTOR TEST CONNECTIONS
X1, #256
#255A
WARNING
ELECTRIC SHOCK
can kill.
• Do not touch electrically hot
parts.
IDEALARC DC-655
4. With the contactor activated, check the
continuity across the contacts. (Zero ohms
or very low resistance is normal.)
Figure F.13. If the resistance is high, the
input contactor 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.
F-34
See