Lincoln Electric IM557 Synergic 7 and 7H - Manual (Page 39)

E-6 TROUBLESHOOTING E-6
SYNERGIC 7 & 7H
Observe all Safety Guidelines detailed throughout this manual
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.
CAUTION
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
12. Arrow keys do not change Weld
speed or volts/trim.
13. WFS knob does not change
Run-in speed.
14. WFS and preset Volts/Trim para-
meters on wire feeder display do
not match those on power
source display.
15. Display does not change when
WFS and/or Volts/Trim knobs
are turned.
a. This is normal, as only the WFS and
volts/trim knobs will adjust these settings.
a. This is normal, as only the arrow
keys will adjust this setting.
a. Power source is defective.
b. Problem with serial communica-
tions in control cable.
c. Problem with wire feeder harness
or Control PCB.
a. A remote control kit is connected.
b. Broken harness wire(s) or harness
disconnected from Encoder
board(s) or Control board.
c. Defective Encoder boards and/or
Control board.
a. Refer to operation section of this manual
a. Refer to operation section of this manual.
a. If parameters on power source and wire
feeder display match when wire feeder is
connected to the other input receptacle (#1
or #2) of power source then power source
is defective.
b. Disconnect input cable from power source
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. Remove molex plug P1 from J1 on Control
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.)
a. When a remote control kit is connected to
the Wire Feeder, the WFS and Volts/Trim
knobs of the Wire Feeder become inactive
and the WFS and Volts/Trim knobs of the
remote control kit must be used.
b. Check for continuity between correspond-
ing harness leads of molex plug P2 on
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. If b. is not the problem and neither the WFS
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.)