Lincoln Electric LN-10 manual Contact your local Lincoln 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

Speed does not change when weld	1.	Run-in and weld speeds are set
current flows.		to the same value.
	2.	Current sensing reed switch is not
		operating properly.
	3.	The wiring from the control p.c.
		board to the weld current sensing
		reed switch is damaged.
	4.	Damaged control p.c. board.
Voltmeter does not function proper- 1.		The work sense lead (#21) or the
ly. Welding may or may not vary		electrode sense lead (#67) may
from normal procedure. Wire feeds		have intermittent or poor connec-
properly.		tions.
	2.	Improper power source selection
		on the control p.c. board.
	3.	Control p.c. board failure.
Cold feed forward or cold feed	1.	The connector from the control
reverse buttons on keypad do not		p.c. board to the display p.c.
work, but motor control otherwise		board or the connector from the
functions properly.		display p.c. board to the keypad
		are loose or improperly inserted.
	2.	Damaged keypad
	3.	Damaged display p.c. board.
	4.	Damaged control p.c. board.
Gas purge key does not operate	1.	The connector from the control
the gas solenoid, but gas flow does		p.c. board to the display p.c.
occur while welding.		board or the connector from the
		display p.c. board to the keypad
		are loose or improperly inserted.

If all recommended possible areas of misadjustment have been checked and the problem persists,

Contact your local Lincoln Authorized Field Service Facility.

2.Damaged keypad

3.Damaged display p.c. board.

3.Damaged control p.c. board.

CAUTION

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

LN-10