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PROBLEM
7. No control of wire feed.
8. No wire feed, solenoid, or arc
voltage. LED display indicated
Synergic 7F has input power.
POSSIBLE CAUSE
a. Defective Wire Feed Unit to
Control box cable or harnessing.
b. Defective wire feed motor tach or
control PC Board.
c. Problem with serial
communications in input control
cable.
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.
WHATTODO
a. 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 harnessing, proceed to b.
b. Measure voltage across pin 2 (+) of
J3 and pin 3 (-) of J3 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.
c. See 2e.
a. Remove gun. Check continuity
between trigger pins with trigger
closed. If no continuity repair or
replace gun.
b. Replace gun. Remove plug from J1
on control board. Check that there is
continuity between plug pins 2 and 8
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 proceed to c. if no
harness problem is encountered.
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 8
(-) of connector J1 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.)
PROBLEMS