MAC TOOLS MW13O - Maintenance and Troubleshooting

SECTION
4-
MAINTENANCE
&
TROUBLESHOOTING
gA
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
maintaining
or
servicing.

4~
M
S

OVING PARTS
can cause
injury.
Keep
away
from
moving
parts.
Keep
awa)
from
pinch
points
such
as
drive
rolls.
Maintenance and
troubleshooting
to
be
performed
only
by
qualified
persons.
swarn8 2 10~9l
Table
4-1.
Maintenance Schedule
Time
Maintenance
Before
each
use.
Tighten
all connections.
Check
gun
and clean nozzle.
After each
spool
of wire.
Blow
out
gun
liner.
Clean
and
check wire drive
parts:
replace
as
necessary.
Every
3 months.
Tape
or
replace
cracked
cables:
clean
and
tighten
connections.
Replace
unreadable labels.
Every
6
months.
Blow
out
or
vacuum
inside
of unit.
4-1
.
Overload
Protection
READ
SAFETY BLOCKS
at start
of
Section
4
before
proceeding.
A.
Overheating
Thermostat
TP
1
protects
the unit
from
damage
due
to
overheating.
If
main
transformer
Ti
gets
too
hot,
TP
1
opens
and
weld
output
stops.
The
pilot
light
turns
off
and the
fan
keeps
running
to
cool the
transformer.
Wait
several minutes be
fore
trying
to
weld.
A~
CAUTION
STATIC
ELECTRICITY
can
damage
parts
on
circuit boards.

Put
on
grounded
wrist
strap
BEFORE
handling
boards
or
parts.
fwarn5.l~ 9/9~
Turn OFF
and
unplug
unit.
Unlatch
door,
remove handle,
and
remove
door/wrapper.
1
Circuit
Board
PCi
Located behind fan.
2 Fuse
Fl
(See
Parts
List
For
Rating)
If
this
fuse
opens,
the wire drive
motor
does
not
run.
Pull fuse
from
fuse
holder
on
PCi.
To
reinstall,
push
fuse
into fuse
holder.
Reinstall
wrapper
and
handle,
and
latch door.
Ref.
ST.155
640 /
ST.149
327
B.
Motor Fuse
Fl
Tools Needed:
3/8
in.
Figure
4-1.
Fuse
Fl
Location
OM-154
404
Page
6