Lincoln Electric SVM127-A service manual Troubleshooting Guide

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F-8		F-8
TROUBLESHOOTING & REPAIR
Observe Safety Guidelines		TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
PROBLEMS	POSSIBLE AREAS OF	RECOMMENDED
(SYMPTOMS)	MISADJUSTMENT(S)	COURSE OF ACTION
	FUNCTION PROBLEMS
The SET speed is adjustable and	1. Contact your local Lincoln	1. While the motor is running,
steady. The actual speed is uncon-	Authorized Field Service	carefully unplug the 15 pin
trollable. The meter displays the	Facility.	molex plug from the control
actual speed correctly or reads		board.
"EEE."		If the motor continues to run,
		the power PC board may be
		faulty. Replace.
		If the motor stops, the control
		PC board may be faulty.
		Replace.
		2. Perform the Wire Drive Motor
		Test.
The SET speed is adjustable and	1. Check for loose or faulty con-	1. Check to make sure the slotted
steady. The actual speed reading	nections on leads #510, #525,	disc in the tach housing is
is incorrect, erratic, or zero.	and #555 between the tach	secure and aligned.
	board and the control PC board.	2. Perform the Tach Board
		Feedback Test.
		3. If the Tach Board Feedback
		Test is OK, the control PC
		board may be faulty. Replace.

CAUTION

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

LN-9 Wire Feeder