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CAUTION:
IMPROPER
FUSES
can
damage
this
If
replacement
becomes
necessary,
use
only
fuses
of
the
proper
size,
type,
and
rating
(see
Parts
List).
To
replace
the fuse,
proceed
as
follows:
1.
Depress
and
rotate
fuse
holder
cover
counterclockwise.
2. Pull
out
fuse
with
cover when
fuse
holder
cover
is
free.
3.
Insert
new fuse
into
fuse
holder
cover.
4.
Install
fuse
with
fuse
holder
cover
back
into
unit.
5.
Depress
and
rotate
fuse
holder
cover
clockwise
until
cover
is
secure.
5
-
3.
DISPLAY
BOARD
METER
CHECK
(Figure
5-1)
-
Check
points
are
provided
on
the
display
board
for
checking
power
supply
and
input
command
for
the
meters.
~
ELECTRIC
SHOCK
can
kill.
•
Do
not
touch
live
electrical
parts.
•
Be
sure
that
personnel
performing
testing
pro
-
cedures
are
familiar
with
and
follow
standard
safe-
ty
practices.
•
Shut
down
unit
before
making
or
changing meter
or
test
equipment lead
connections.
ELECTROSTATIC
DISCHARGE
(ESD)
can
damage
electronic components.
•
Put
on a
properly
grounded
wrist
strap
BEFORE
handling
circuit
boards.
•
Transport
all
static-sensitive
components
in
pro
-
per
static-shielding
carriers
and
packages.
•
Perform
work
only
at
a
static-safe
work
area.
unit.
3.
Check
voltage according to
Figure
5-1.
4.
If
a
meter
power
supply
and
command
voltage
is
correct
and
the
meter is
not
working,
replace
the
meter
(see
Section
5-4).
5.
If
the
power supply
or
command
voltage is
incor
-
rect,
replace
display
board
PC4
(see
Section
5-4).
5
-
4.
BOARD REPLACEMENT
PROCEDURES
(Figure
5-2)
ELECTRIC
SHOCK
can kill.
•
Do
not
touch
live electrical
parts.
•
Shut
down
unit,
welding
power
source,
and
robot, and
disconnect
input
power
employing
“lockout/tagging
procedures”
before
inspecting
or
servicing.
Lockout/tagging
procedures consist
of
padlocking
line
disconnect
switch
in
the
open
position,
removing
fuses
from
fuse
box,
or shutting
off
and
red-tagging
circuit
breaker
or
other disconnecting
device.
ELECTROSTATIC
DISCHARGE
(ESD)
can
damage
circuit
board
components.
•
Put
on
properly
grounded
wrist
strap
BEFORE
handling
circuit
boards.
•
Transport
all
static-sensitive
components
in
pro
-
per
static-shielding
carriers
or
packages.
•
Perform
work
only
at
a
static-safe
work
area.
INCORRECTLY INSTALLED
PLUGS
can
damage
circuit
boards.
•
Be
sure
that
plugs
are
properly
aligned and
install
-
ed
onto
connectors
before resuming
operation.
All
directions,
such
as
left
or
right,
are
with
respect to
the
operator facing
the
unit
front
panel.
Retain
all
hardware
removed during
this
procedure
for
reinstallation.
A.
Display Board
PC4 And
Meter
Replacement
WARNING:
IMPORTANT:
1.
Remove
computer
interface
top
cover.
1.
Remove
unit
top
cover.
2.
Locate display
board
PC4.
Figure
5
-
1.
Display Board
Meter
Checks
OM-882
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