Lincoln Electric IM648-B specifications Possible fault in Output Power board

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

PROBLEMS

(SYMPTOMS)

POSSIBLE AREAS OF MISADJUSTMENTS(S)

RECOMMENDED

COURSE OF ACTION

When the trigger is pulled air begins	1.	Check the torch consumables to be
to flow, but there is no pilot arc after		sure they are not dirty or greasy,
at least 3 seconds.		and are in good shape. Replace
		the consumables if necessary.
	2.	Make sure the air pressure is set
		at 70 psi (75 psi for a 50 ft. torch).
	3.	Make sure there are no kinks or
		restrictions for air flow in the torch
		cable. Replace cable as needed.
	4.	If a slight thump cannot be felt in
		the torch when the trigger is
		pulled, check for loose connection
		in the torch head and solenoid
		assembly.
	5.	With machine turned off - input
		power removed, and torch and
		consumables connected - mea-
		sure resistance on Output Power
		board between B1 and B21. If
		>10Ω, possible fault in torch and
		cable assembly.
	6.	Possible fault in Output board.
The air begins to flow and there is a	1.	Check the torch consumables to
very brief arc that snaps out consis-		be sure they are in tight, not dirty
tently with repeated trigger pulls.		or greasy and in good shape.
		Replace if necessary.
	2.	Make sure the air pressure is set
		at 70 psi.
	3.	Possible fault in Output Power board.
The arc starts but sputters badly.	1.	Check the torch consumables to
		be sure they are in tight, not dirty
		or greasy and in good shape.
		Replace if necessary.
	2.	Check air supply for oil or a great
		deal of water. If there is oil or a
		great deal of water, the air must
		be filtered or the machine
		switched to nitrogen or bottled air.
	3.	Make sure the air pressure is set at 70 psi.

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

your local Lincoln Authorized Field Service Facility.

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.

PYTHON