Lincoln Electric IM559 Synergic 7F and 7FH - Manual (Page 39)

E-10 TROUBLESHOOTING E-10
SYNERGIC 7F & FH
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 AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
23. Display is blank.
24. Wire feed speed is consistent
and adjustable, but operates at
the wrong speed.
a. Power source is OFF.
b. Feeder supply fuse or circuit
breaker at power source is blown
or tripped.
c. Display or Control PC board is
bad.
a. Defective gearbox ratio sensing or
Control board.
a. Turn ON power source.
b. Check input cable and feeder unit for
short in 41 and 42 circuit. Check for
shorted motor. Replace fuse or reset
circuit breaker.
c. Observe LED mounted on Control PC
board. It should blink on and off at a
controlled rate of 1 second ON and 1
second OFF. If so, then replace
Display PC board. If not, replace
Control PC board. (See Procedure
for Replacing
a. Remove Control board plug form J4.
If you have a high speed Wire Feed
Unit check that you have continuity
between plug P4 pins 10 and 11.
Likewise, if you have a standard
speed Wire Feed Unit make sure that
you do not have continuity between
plug P4 pins 10 and 11. If the conti-
nuity test fails, check continuity of K to
K and L to L connections in 14-pin
cable between Control Box and Wire
Drive Unit. Also check for no continu-
ity between K and L connections when
cable is detached. If either of these
tests failed, replace cable. Otherwise
check continuity of leads 530 and 531
in the Control Box and the Wire Drive
Unit. (See wiring diagram.) Repair or
replace faulty harness. Otherwise,
replace Control board. (See proce-
dure for replacing PC boards.)