AUTO ARC 120 - GENERAL TROUBLESHOOTING

5-5.
Troubleshooting
a
WARNING
ELECTRIC
SHOCK
can
kill.

Do
not
touch
live electrical
parts.

Turn
Off
welding
power
source,
and disconnect
input
power
before
inspecting, maintaining,
or
servicing.
HOT
PARTS
can
cause severe
burns.

Allow
cooling period
before
servicing
gun
or
unit.
MOVING PARTS
can
cause
inJury~

Keep
away
from
moving
parts.

Keep
away
from
pinch
points
such
as
drive
rolls.
shooting
to
be
performed
only
by
qualified
swam9,2
2/93
Table
5-1.
Welding
Trouble
Low
weld
output.
Section
3-3
--S
--
-S
5-2B
S
5-2A
---S
--


Figure
4-2
-S
*

3-2

~
Connect
unit
to
proper
input
voltage
or
check for
low
line
voltage._~

--~
~
ASee
Gun
Owners
Manual
Table
5-2.
Wire
Drive/Gun
Trouble
Section
5-3
-S
3.4
-S
5-3

--S
-S
--S
--S
--S
--S
Trouble
No
weld
output;
wire
does
not
feed;
fan

-~
does
not
run.
Remedy
Secure
power
cord
plug
in
receptacle.
Replace building
line
fuse
or
reset
circuit breaker
if
open.
Secure
gun
trigger plug
in
receptacle
or
repair
leads,
or
replace
trigger
switch.
Have
nearest
Factory
Authorized
Service Station/Service
Distrib
utor
check
and
replace
Power
switch.
---S
-S
-S
No
weld
output;
wire
does
not
feed;
fan


motor
continues
to
run.
3-3
*
No
weld
output;
wire
feeds.
Thermostat
TP1
open
(overheating).
Allow
fan
to
run;
the
thermo
stat
will
close when the
unit has cooled.
Check
and
replace
motor
fuse
Fl.
Have
nearest
Factory
Authorized
Service
Station/Service
Distrib
utor
check
and
replace
switch control
relay
if
necessary.
Connect
work
clamp
to
get
good
metal
to
metal
contact.
Replace
contact
tube.
Check for
proper
connections
at
polarity
changeover
board.
Trouble
Electrode
wire
feeding
stops
during ~

welding.
Remedy
--S
Straighten
gun
cable
and/or
replace
damaged
parts.
Adjust
drive roll
pressure.
Change
to
proper
groove.
Readjust
hub tension.
Replace
contact
tube if
blocked.
Clean
or
replace
wire inlet
guide
or
liner
if
dirty
or
plugged.
Replace
drive roll
or
pressure
bearing
if
worn
or
slipping.
Secure
gun
trigger
plug
in
receptacle
or
repair
leads, or
replace
trigger
switch.
Check and
replace
motor
fuse
Fl.
Check
and clear
any
restrictions
at
drive
assembly
and liner.
Have
nearest
Factory
Authorized
Service
Station/Service
Distribu
tor
check
drive
motor.
ASee Gun Owners
Manual
5-4
*
53
A
5-3
*
5-2A
5-3,
*
OM-l5l
015
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