Miller Electric D-75D Troubleshooting, Disconnect power before troubleshooting, Trouble Remedy

7-4. Troubleshooting

		Y Disconnect power before troubleshooting
	Trouble	Remedy
Wire feeds, shielding gas flows, but		Check cable connections. Check cables for continuity, and repair or replace cables if necessary
electrode wire is not energized.		(see Section 5-3).
Wire feeder is on, display does not light		Check and reset circuit breaker at welding power source.
up, motor does not run, gas valve and
welding power source contactor do not
pull in.
Electrode wire feeding stops or feeds		Check gun trigger connection. See gun Owner’s Manual.
erratically during welding.
		Check gun trigger. See gun Owner’s Manual.
		Readjust hub tension and drive roll pressure (see Section 5-11).
		Change to correct size drive roll (see Section 5-7and Table 9-1).
		Clean or replace dirty or worn drive roll.
		Incorrect size or worn wire guides.
		Replace contact tip or liner. See gun Owner’s Manual.
		Remove weld spatter or foreign matter from around nozzle opening.
		Check brushes in drive motor. If brush length is less than 1/4 inch, replace brushes.
		Have Factory Authorized Service Agency check drive motor or motor control board PC1.
Motor runs slowly.		Check for correct input voltage.
Wire feeder power is on, displays light		Check welding gun trigger leads for continuity, and repair leads or replace gun.
up, feeder jogs, purges, but unit is in-
operative.
When triggered wire feeds but no gas,		If the welding arc does not establish in 3 seconds after the gun trigger is activated the unit will feed
no contactor.		wire, but turns off contactor and gas valve. If the gun trigger is still activated after two minutes, the
		wire will stop feeding.

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