Lincoln Electric DC-400 specifications Your local Authorized Field, Service Facility

E-4	TROUBLESHOOTING	E-4
	Observe all Safety Guidelines detailed throughout this manual

PROBLEMS

(SYMPTOMS)

POSSIBLE

CAUSE

RECOMMENDED

COURSE OF ACTION

OUTPUT control not functioning on	1. OUTPUT CONTROL switch in
“REMOTE” control.		wrong position. Place switch in
		“REMOTE”.
	2.	Faulty OUTPUT CONTROL
		switch.
	3.	Faulty remote control potentiome-
		ter.
	4.	Leads or connections open in
		control circuit.
	5.	Faulty Control PC Board.
Poor arc striking with semiautomat-	1.	Defective start circuit.
ic or automatic wire feeders.	2.	Poor work connection.	If all recommended possible areas of
	3.	Improper procedures.	misadjustment have been checked
	4.	Defective Control PC Board.	and the problem persists, Contact
			your local Authorized Field
Poor arc characteristics.	1.	Start circuit energized at all times
			Service Facility.
		(read switch CR3 not closing).
	2.	Defective Start PC Board.
	3.	Defective Control PC Board.
	4.	Capacitor(s) in output circuit
		failed. A failure is indicated if the
		small vent plug on top of a capac-
		itor is raised or blown out.
ARC CONTROL has no effect in	1. Defective R1, L1, S4C, S4D actu-
CV (FCAW/GMAW) mode with		ator or S5.
short circuit transfer processes.
115VAC Receptacle not working.	1. Circuit Breaker Tripped.
	2.	Defective Circuit Breaker.
	3.	Broken Connection in Wiring.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

DC-400