Lincoln Electric IM557 Arrow keys do not change Weld, Speed or volts/trim, Source display, Boards

E-6	TROUBLESHOOTING	E-6
	Observe all Safety Guidelines detailed throughout this manual

PROBLEMS

(SYMPTOMS)

POSSIBLE

CAUSE

RECOMMENDED

COURSE OF ACTION

12. Arrow keys do not change Weld	a. This is normal, as only the WFS and	a. Refer to operation section of this manual
speed or volts/trim.	volts/trim knobs will adjust these settings.
13. WFS knob does not change	a. This is normal, as only the arrow	a. Refer to operation section of this manual.
Run-in speed.	keys will adjust this setting.
14. WFS and preset Volts/Trim para-	a. Power source is defective.	a. If parameters on power source and wire
meters on wire feeder display do		feeder display match when wire feeder is
not match those on power		connected to the other input receptacle (#1
source display.		or #2) of power source then power source
		is defective.
	b. Problem with serial communica-	b. Disconnect input cable from power source
	tions in control cable.	and wire feeder. Check continuity between
		socket G of 8-socket plug and pin G of 14
		pin plug of the input cable. Check continu-
		ity between socket H of 8-socket plug and
		pin H of 14-pin plug of the input cable.
		Replace cable if no continuity.
	c. Problem with wire feeder harness	c. Remove molex plug P1 from J1 on Control
	or Control PCB.	PCB. Check continuity from pin G of 8-pin
		receptacle on wire feeder to pin 4 of plug
		P1, and from pin H of 8-pin receptacle to
		pin 3 of plug P1. If no continuity then repair
		harness, otherwise replace Control PCB.
		(See procedure for replacing PC boards.)
15. Display does not change when	a. A remote control kit is connected.	a. When a remote control kit is connected to
WFS and/or Volts/Trim knobs		the Wire Feeder, the WFS and Volts/Trim
are turned.		knobs of the Wire Feeder become inactive
		and the WFS and Volts/Trim knobs of the
		remote control kit must be used.
	b. Broken harness wire(s) or harness	b. Check for continuity between correspond-
	disconnected from Encoder	ing harness leads of molex plug P2 on
	board(s) or Control board.	Control board and molex plugs P12 and
		P13 on Encoder boards (refer to wiring dia-
		gram). If any of these continuity tests fail,
		repair or replace harness.
	c. Defective Encoder boards and/or	c. If b. is not the problem and neither the WFS
	Control board.	or Volts/Trim knobs are properly adjusting
		then replace the Control board. If one of
		the knobs is properly adjusting, plug the
		harness, P12 or P13, from the working
		board into the nonfunctional board. If the
		previously nonfunctional board is now work-
		ing then replace the Control board, other-
		wise replace the nonfunctional Encoder
		board. (See procedure for replacing PC
		boards.)

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.

SYNERGIC 7 & 7H