Lincoln Electric IM559 Synergic 7F and 7FH - Manual (Page 33)

E-4 TROUBLESHOOTING E-4
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
7. No control of wire feed.
8. No wire feed, solenoid, or arc volt-
age. LED display indicated
Synergic 7F has input power.
a. Problem with serial communications.
b. Defective Wire Feed Unit to
Control box cable or harnessing.
c. Defective wire feed motor tach or
control PC Board.
a. Faulty gun or gun trigger switch.
b. Defective Control Box to Wire
Feed Unit Cable or harness wiring
& connections.
c. Defective control PC board or gun
connector.
a. If WFS and preset Volts/Trim parame-
ters on wire feeder display do not
match those on power source display,
see Problem 14.
b. Remove Control Box to Wire Feed Unit
Cable and Check F to F, G to G and H to H
for continuity. If any of the continuity tests
fail, replace cable. Otherwise check related
harnesses for continuity (Refer to Wiring
Diagram). If continuity checks O.K. on har-
nessing, proceed to c.
c. Measure voltage across pin 13 (+) of J4
and pin 1 (-) of J4 on PC board with motor
running. If voltage is 1.5-3.5V then replace
control PC board (see Procedure for
Replacing PC Boards). If not, then replace
tachometer.
a. Remove gun. Check continuity
between trigger pins with trigger
closed. If no continuity repair or
replace gun.
b. Replace gun. Remove plug from J4 on con-
trol board. Check that there is continuity
between plug pins 2 and 12 when trigger is
closed and no continuity when trigger is
open. If the continuity tests pass proceed to
c. If not, check I to I and J to J in cable. If
this continuity test fails, replace cable.
Otherwise check wiring harnesses and pro-
ceed to c. if no harness problem is encoun-
tered.
c. Remove gun. Check voltage across
trigger sockets on gun connector.
If voltage is > ±11V DC, then gun is
defective.
If voltage is < ±11V DC, then check
the voltage across pin 2 (+) and pin 12
(-) of connector J4 on control PC
board.
If the voltage is still < ±11V DC, then
replace control PC board, otherwise,
replace gun connector. (See
Procedure for Replacing PC boards.)