Lincoln Electric IM604-B manual Troubleshooting, Trouble Cause What to do

19		TROUBLESHOOTING			19
	TROUBLE	CAUSE		WHAT TO DO
	A. No welder or output power.	1.	Open in miscellaneous leads.	1.	Refer to wiring diagram &
					check related leads.
		2.	Open lead in flashing or field	2.	Refer to wiring diagram and
			circuit.		check all related leads (200,
					224, 200A, 200B, 201, 201A).
		3.	Faulty rotor.	3.	Lift brushes and check rotor
					resistance between slip rings.
					It should be approximately
					4 ohms.
		4.	Faulty Potentiometer (R1).	4.	Replace with known good one.
		5.	Faulty stator Field winding.	5.	Disconnect lead #9 at D2 and
					check for continuity between
					leads #9 and #7.
		6.	Faulty Field rectifier (D2).	6.	Replace with known good one.
		7.	Faulty P.C. Board.	7.	Replace with known good one.
	B. Engine will not idle down to	1.	Idler switch on High Idle.	1.	Set switch on Automatic Idler.
	low speed.
		2.	Insufficient voltage present	2.	Check for proper connection of
			between terminals #213 and		leads (#213, #5E, #215, #209,
			#5E. (Voltage should be 12V		#209A, #224, #224A).
			DC).
		3.	External load on welder or	3.	Remove all external loads and
			auxiliary power.		short circuits.
		4.	Faulty wiring in solenoid circuit.	4.	Check for broken leads #213
					and #215.
		5.	Faulty idler solenoid.	5.	Replace with known good one.
		6.	Faulty P.C. Board.	6.	Replace P.C. Board with
					known good one.
	C. Engine will not go to high idle	1.	Poor work lead connection to	1.	Make certain work clamp is
	when attempting to weld.		work.		tightly connected to clean base
					metal.
		2.	No voltage signal from the	2.	Check for disconnected or
			current sensor.		broken leads in idler sensing
					circuit.
		3.	No open circuit voltage on	3.	Check generator output.
			output studs.
		4.	Faulty P.C. Board.	4.	Replace P.C. Board with
					known good one.
			RANGER 8 LPG