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TROUBLESHOOTING & REPAIR
INPUT CONTACTOR TEST (continued)
FIGURE F.3 – DC COIL INPUT CONTACTOR CONNECTIONS
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TEST PROCEDURE
1.Disconnect the main input supply power to the machine.
2.With the 5/16” nutdriver, remove the case top and the reconnect panel cover.
3.Locate the two leads connected to the input contactor coil, #233A and #232A. See Figure F.3.
4.Connect a DC voltmeter to the leads.
WARNING
Electric Shock can kill.
•With the input power on, there are high volt-
ages inside the machine. Do not reach into the machine or touch any internal part of the machine while the power is on.
5.Apply the correct voltage to the machine and turn the power switch (S1) ON.
6.Check for approximately 120VDC at the contactor coil leads. If the 120VDC IS pre- sent at the contactor coil, the input contac- tor should activate. If it does not, the input contactor may be faulty. Check or replace.
If the 120VDC is NOT present, check for 120VAC at leads #233 and #232 at diode bridge D8. See the Wiring Diagram. If the AC voltage IS present but the DC voltage is low or not present, the diode bridge may be faulty. Check or replace.
If the 120VAC is NOT present at leads #232 and #233, with the power switch (S1) on, check the power switch, thermostats, and associated circuitry. See the Wiring Diagram.