MAC TOOLS MW165 - Maintenance Schedule; Overload Protection; Overheating; Motor Fuse F1

SECTION
4-
MAINTENANCE
&
TROUBLESHOOTING
AA
WARNING
ELECTRIC SHOCK
can
kill.

Do
not
touch
live electiical
parts.

Turn
Off
welding
power
source,
and
discc
Input
power
before
inspecthg, maintaining,
servicing.
HOT PARTS
can
cause
severe
burns.

Allow
cooling
period
before
maintaining
or
servicing.
MOVING
PARTS
can
cause
injury.

Keep
away
from
moving
parts.

Keep
away
from
pinch points
such
as
drive
rolls.
eshooting
to
be
performed
swam8.2~
2/93
A.
Overheating
Table
4-1.
Maintenance Schedule
Thermostat
TP1
protects
the
unit
from
damage
due
to
overheating.
If main
transformer
gets
too
hot,
TP1
opens
and
weld
output stops,
but
fans
keep running
to
cool
transformer.
Wait
several minutes
before
trying
to
weld.
B.
Motor
Fuse
Fl
If
Fl
opens,
wire
drive
motor
shuts
down.
Replace
Flit
open.
Reinstall
wrapper
and
handle,
and
latch door.
Tools
Needed:
lime
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
I
~r1.~jj(~

READ
Sectio
SAFETY
n
4
befor
BLOCKS
at
start
of
e
proceeding.
____
AA
CAUTION
STATIC ELECTRICITY
can
damage
parts
on
circuit boards.

Put
on
grounded
wnst
strap
BEFORE
handling
boards
or
parts.
twam5.1~
9191
Turn Ott
and
unplug
unit.
Unlatch
door,
remove
handle,
and
remove
door/wrapper.
1
Circuit
Board
PCi
2
Fuse
Fl
(See
Parts
List
For
Rating)
Figure
4-1.
Fuse Fl Location
~3
3/8
in
Ref.
91-801
785
OM-185 356
Page
9