Filter
Top Products
Table 8-1.
Troubleshooting
TROUBLE
CAUSE REMEDY
Wire
does not feed.
Circuit
breaker
CB1.
Check
gun
liner,
hub
tension,
and
drive
roll
pressure
(see
Section
4).
Reset
CBl
(see
Sec
tion
10-5).
Loose
or
improperly
made gun
trigger
connection.
Check
gun
trigger
connection
(see
Section
4-3).
Gun
trigger. See
gun
Owner’s
Manual.
Welding
gun
shorted.
Repair
or
replace
welding
gun.
Motor
Ml.
Check
connections
for
continuity
to
Ml.
Check
motor brushes
(see
Section
10-4).
Replace
Ml
if
necessary.
Motor
Control
Board
PCi
or
poor connections
to
PCl.
Check
connections
for
continuity
to
PCl.
Check
PCi
according
to
Diagram
8-2
and
Sec
tion
8-4.
Replace
PCl
if
necessary.
Wire feeds
erratically. Pressure
on
drive
roll
is
insuf-
ficient.
Rotate
pressure adjustment
knob
counter
clockwise
in
1/4
turn
increments
until
the
wire
stops
slipping
(see
Section
4-2).
Drive
roll
wrong size
for wire
size
used.
Change
to
correct
size drive
roll
(see
Section
4-2).
Drive rolls
worn.
Replace
drive rolls
(see
Section
4-2).
Dirt in
drive
rolls.
Clean drive rolls
(see
Section
l0-lC).
Motor
Control
Board
PCl
or
poor
connections
to
PCi.
Check
connections
for
continuity
to
PCi.
Check
PCi
according
to
Diagram 8-2
and
Sec
tion
8-4.
Replace
PCi
if
necessary.
Wire feeds
but there
is
no
gas
flow.
Gas valve
GSl.
Check
GS1
for
proper
coil
voltage
and
connec
tions
(see
Diagram
8-1).
Check
continuity
of
coil.
Replace
GSl
if
necessary.
Motor
Control
Board
PCl
or
poor
connections
to
PCl.
Check
connections
for
continuity
to
PCl.
Check
PCl
according
to
Diagram
8-2
and
Sec
tion
8-4.
Replace
PCl
if
necessary.
Wire
does not
feed
until
trigger
is
pulled
but
continues
to
feed
after
trigger
is
released.
Welding
gun
is
shorted
be-
tween
one of
the
trigger leads
and
weld
cable.
Repair
or
replace
welding
gun.
Gun nozzle
opening
restricted. Weld
spatter
or
foreign
matter
accumulation.
Carefully
remove
any
weld spatter
or
foreign
matter
which
may accumulate
around the
nozzle
opening.
Use
a hardwood
stick,
never
a
metal
tool.
The
gas
valve
in
the
feeder
is
rattling
loudly
along
with possi-
ble
erratic
or
slow
wire
feed
speed.
Welding
gun
is
shorted
be-
tween
one of
the
trigger leads
and
weld
cable.
Repair
or
replace
welding
gun.
Motor
runs
but
wire
is
not
ener-
gized
with
Spot/Burnback
Op-
tion
installed.
Spot/Burnback
Board PC2
or
poor connections
to
PC2.
Check
connections
for
continuity
to
PC2.
Check
PC2
according
to Diagram
8-3
and Section 8-5.
Replace
PC2
if
necessary.
TM-i
571
Page
15
5-21E