2500_Users_Manual-.pdf - 第254页

1927-1 PRINTED CIRCUIT BOARD 1928-1 SCREW RETAINING BLOCK CONTACT SET Repair and Replacement Procedures Figure 7-19 Removing the DIP Module from the Circuit Board 3. Turn the module so the underside is facing you. 4. Use…

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Repair
and
Replacement
Procedures
Keyboard/Display
Assembly
Replacement
This
procedure
describes
the
steps
required
to
remove
and
replace
the
keyboard
/display
assembly.
Replacing
the
Keyboard/Display
Assembly
If
the
keyboard/display
assembly
fails,
follow
the
steps
below
to
replace
it.
1.
Turn
off
the
2500
and
remove
the
power
cord.
2.
Use
the
flat
edge
of
a
flat-head
screwdriver
(or
a
table
knife)
to
pry
up
the
bottom
left
and
top
sides
of
the
keyboard/display
assembly,
which
is
affixed
with
two-sided
tape.
CAUTION:
Do
not
pry
up
the
right
side
of
the
display.
3.
Pull
the
keyboard/display
assembly
away
from
the
2500.
Note:
The
keyboard/display
assembly
is
held
in
place
with
double-sided
tape.
4.
Remove
the
two
cables
that
connect
the
keyboard/display
assembly
to
the
controller
board.
5.
Apply
double-sided
tape
to
the
underside
of
the
new
keyboard/
display
assembly.
6.
Connect
the
two
controller
board
cables
to
the
new
keyboard/display
assembly.
7.
Press
the
new
keyboard/display
assembly
into
place.
Programming
Module
Components
Replacement
These
procedures
describe
the
steps
required
to
replace
failed
components
on
programming
modules.
Replacing
Contacts
On
a
DIP
Module
Use
the
following
procedure
to
replace
the
contact
sets
on
a
programming
module.
Replace
both
sides
at
the
same
time.
1.
Mark
the
module
on
the
end
next
to
the
narrower
end
of
the
circuit
board.
You
must
reinstall
the
module
on
the
board
in
the
correct
orientation.
It
is
possible
to
reinstall
the
module
backwards
on
the
board.
2.
Remove
the
four
hex
screws
from
the
underside
of
the
programming
module
board
and
remove
the
printed
circuit
board
(see
Figure
7-19).
ProMaster
2500
User
Manual
7-29
1927-1
PRINTED
CIRCUIT
BOARD
1928-1
SCREW
RETAINING BLOCK
CONTACT SET
Repair
and
Replacement
Procedures
Figure
7-19
Removing
the
DIP
Module
from
the
Circuit
Board
3.
Turn
the
module
so
the
underside
is
facing
you.
4.
Use
a
1/
16-inch
hex
wrench
to
remove
the
two
screws
(on
the
sides
of
the
module)
that
hold
the
retaining
block
in
place
(see
Figure
7-20).
Remove
the
retaining
bar
and
set
it
aside.
5.
Hold
the
black
plastic
base
of
the
contact
and
gently
remove
the
set
through
the
underside
of
the
module
(see
Figure
7-21).
Do
not
remove
the
set
through
the
top
of
the
module.
Figure
7-20
Removing
the
Retaining
Block
I
o
o
o
O
I
o
7-30
ProMaster
2500
User
Manual
1929-1
CONTACT SET
RETAINING BLOCK (1 of 2)
SCREW (2 per side)
VIEW FROM BELOW
CROSS SECTION
CROSS SECTION PLANE
TILT CONTACT SET BEFORE
REMOVING OR INSERTING
Repair
and
Replacement
Procedures
Figure
7-21
Removing
or
installing
the
Contact
Set
Replacing
Contacts
on
a
PLCC
Module
6.
Gently
feed
the
new
contact
set
through
the
underside
of
the
module
into
its
operating
position.
The
contact
set
has
a
notch
that
fits
the
ridge
in
the
module
to
set
the
correct
alignment.
Confirm
that
these
two
are
seated
before
proceeding.
7.
Set
the
retaining
bar
in
position
on
the
contact
set,
and
use
the
two
screws
to
hold
the
bar
in
place.
8.
Insert
the
contact
set
on
the
other
side,
and
tighten
its
retaining
screws.
9.
Reinstall
the
programming
module
on
the
circuit
board,
observing
the
correct
orientation
as
you
noted
in
the
first
step.
When
contacts
fail
because
of
a
high
number
of
insertions,
they
generally
exhibit
a
gradual,
progressive
increase
in
programming
failures
over
several
days
or
weeks.
Sudden
onset
of
a
high
programming
failure
rate
is
usually
an
indication
of
some
other
problem
and
not
a
sign
of
worn
contacts.
One
method
of
keeping
track
of
the
number
of
devices
programmed
is
to
use
TaskLink's
Session
Data
Logging
feature
(see
page
3-19).
When
enabled,
this
option
maintains
a
log
of
all
TaskLink
operations
and
continuously
updates
the
statistics
in
a
file
on
your
PC.
One
of
the
categories
recorded
is
a
count
of
the
number
of
devices
processed
during
each
Task
run.
These
statistics
allow
you
to
calculate
the
number
of
insertions
for
each
device
type.
CAUTION:
To
avoid
possible
damage
to
the
system
components,
this
procedure
should
加
performed
only
by
a
qualified
service
technician.
o
I
—Bo.
o
ProMaster
2500
User
Manual
7-31