Lincoln Electric SVM204-A service manual Voltage, and resistance

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F-9		TROUBLESHOOTING AND REPAIR					F-9
Observe Safety Guidelines detailed in the beginning of this manual.
	PROBLEMS		POSSIBLE AREAS OF			RECOMMENDED
	(SYMPTOMS)		MISADJUSTMENT(S)			COURSE OF ACTION
			OUTPUT PROBLEMS
(Continued)						3. If voltage is present at J3-9, check
						for battery voltage at J3-8 (lead
						#224A). If voltage is not present,
						replace the PC board.
						4. If voltage is present at J3-8,
						check for battery voltage at J1-
						9 (lead #224). If voltage is not
						present, check leads 224 and
						224A. Check the positive
						terminal connections at the
						hour meter.
						5. Check that the PC board is
						properly grounded, pin J1-2
						(lead GND-G).
						6. Perform the rotor flashing,
						voltage, and resistance
						tests.
						7. Perform the stator resistance
						and voltage tests.
There is no weld output, or weld			1. Check	weld	cables,	1. Check for loose or damaged
voltage drops dramatically when			connections, work clamps, and			connections between	the
trying to	strike an	arc. The	electrode holder.			output terminals, the choke,
115/230 VAC auxiliary output is			2. With engine running at high			the rectifier, the rector, and the
normal;	engine	operates				stator. See wiring diagram.
			idle, and output control set to
normally.
			maximum,	check	the DC	2. With engine running at high
			voltage at the weld output			idle, and output control set to
			terminals.	It should measure		maximum, check for about 63
			70 to 80 Volts RMS.			VAC from each of the two
						stator weld windings (W1 to
						W2) and (W3 to W4).	See
						wiring diagram. If voltage is
						not present for either test, the
						stator is probably defective.
						3. With the engine still running,
						check for about 63 VAC at
						W1A to W2 and from W3A to
						W4. If voltage is not present
						for either test, the reactor may
						be defective.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call 1-888-935-3877.

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