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WARNING: ELECTRIC SHOCK
can
kill.
Do
not
touch live electrical
parts.
Shut down
unit,
welding
power
source,
and wire
feede~
and disconnect
input
power
employing
Iockout/
tagging procedures
before
making
circuit
board modifications.
Lockout/tagging
procedures
consist of
padlocking
line disconnect switch
in
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 boards.
i
Put
on
properly grounded
wrist
strap
BEFORE
handling
circuit boards.
Transport
circuit boards in proper
static-shielding
carriers
or
packages.
Perform work
only
at
a
static-safe
work
area.
IMPORTANT:
A
customer-supplied
cord
(Miller #042562)
is
required
to connect the
welding
power
source
to
the weld
control.
1.
Loosen
screws
securing
front
access
door,
and open door.
2.
Locate
voltage
control board PCi in lower left
portion
of
component
mounting
panel
inside robot interface
con
trol.
3.
Mark and disconnect leads from
voltage
control board PCi.
4.
Mark and disconnect
plugs
from PCi.
5.
Note
position
of circuit board
and
remove
from unit.
6.
Place circuit board
on a
stationary
work surface
so
that
component
side is
facing
up.
7.
Locate
jumpers
Ji thru J8
on
surface of board
(see Figure 3-8).
8.
Use
a
sharp
tool
to
remove
sealant
coating
from all
jumper
locations,
and
remove
foil
jumper
between
pads
at
J2,
J4, J6,
and J8.
9.
Apply
a
small
amount
of solder
to
bridge
the foil
pads
at
jumper
Ji, J3, J5,
and J7.
10.
Apply
a
sealant
coating
over
all
jumper
locations.
11.
Reinstall circuit board into unit
in its
original position.
12.
Reconnect marked leads and
plugs
to
appropriate
locations.
Receptacle
RC1 6 leads
76, 77,
and
78
must
be
changed
at
plug
PLG1
4
connected
to
receptacle
RC1
on
voltage
con
trol board
PCi
as
follows:
IMPORTANT: See
receptacle
RC1
pin
designations
etched
on
circuit board
to
identify plug openings.
1.
Locate and disconnect
plug
PLG14 from
receptacle
RC1
on
voltage
control board
PCi.
2.
Mark and
remove
leads
76, 77,
and 78 from
plug
PLG1
4
by inserting
end of
a
small,
flat-tip
screwdriver into
window
on
side of
plug
to
bend down
locking
tab,
and
pull
contact
attached
to
lead from
plug.
3.
Bend
locking
tabs
on
lead
contacts Out
50
thatthey
secure
contacts when inserted
into
plug.
4.
Insert lead contacts into
plug
as
follows:
a.
Lead 76
to
plug
opening
10.
b.
Lead
77 to
plug opening
8.
c.
Lead 78
to
plug opening
9.
5.
Reconnect
plug
PLG14
to
receptacle
RC1
on
voltage
control board PCi.
6.
Close and
secure access
door.
Add
Figure
3-8.
Jumper
Locations On
Voltage
Control Board PCi
OM-1355828Page3
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