Lincoln Electric SVM 117-A service manual Rectifier Assembly Test

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F-4	TROUBLESHOOTING & REPAIR				F-4
	TROUBLESHOOTING GUIDE - Observe all Safety Guidelines detailed throughout this manual
	PROBLEMS	POSSIBLE AREAS OF		RECOMMENDED
	(SYMPTOMS)	MISADJUSTMENTS(S)		COURSE OF ACTION
		OUTPUT PROBLEMS
No Open Circuit Voltage output but		1. Check the input voltage at the	1.	Check for loose or broken con-
wire feeds normally when gun trig-		machine. Input voltage must		nections at the output terminals,
ger is pulled.		match the rating plate and the		the choke, the capacitor bank
		reconnect panel.		and all heavy current carrying
				leads.
		2. The gun may be faulty. Check
		or replace.	2.	Make sure that the transformer
				secondary leads are	securely
				connected to the SCR Rectifier
				Assembly.
			3.	Perform the SCR	Rectifier
				Assembly Test.
			4.	The control board may be faulty
				- Replace.
Wire feeds but welding output is low		1. Make sure that the proper wire	1.	Check for loose or faulty con-
causing wire to "stub". Welds are		and procedures are being used.		nections of the heavy current
"cold". Machine cannot obtain full				carrying leads.
rated output of 200 amps at 28 volts.		2. Check gun and work cable for
		loose or faulty connections.	2.	The output capacitor bank may
				be faulty. Check for loose con-
				nections at the capacitors. Also
				check for leaky capacitors.
				Replace if necessary.
				WARNING: The liquid elec-
				trolyte in these capacitors is
				toxic. Avoid contact with any
				portion of your body.
			3.	Perform the SCR	Rectifier
				Assembly Test.
			4.	Perform the Main Transformer
				Test.
			5.	The control board may be faulty.
				Replace.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, con- tact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed call 216- 383-2531 or 1-800-833-9353

WIRE-MATIC 250