Maintenance And Troubleshooting - MAC TOOLS MW13O Owner's Manual

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