Philips pm2521 - Replacing Parts; Function Switch; Thermal Fuse

58
2.2.
REPLACING
PARTS
2.2.1.
Liquid
crystal
display
(fig.
44
item
1),
display
unit
N3 (fig.
44
item
2),
interconnection
rubber
(fig.
44
item
3)
or
function
knob (fig.
44
item
4).
—
Remove
the
front
assembly.
—
Remove
the
six screws
and
the
screening
plate
of
the
front
assembly,
(fig.
44
item
6).
NOTE:
The
potentiometer
R502
can
now
be
removed.
—
Remove
the
function
knob
by bending
out
the
four
hooks
of the
front plate,
(only
for
replacing
the
function
knob)
(fig.
44 item
8).
-
Remove
the
three
screws
from
the
display
unit
cover
and the
cover
itself, (fig.
44 item
5).
—
Replace
the
defective
component
and
mount
the
L.C.D. unit
again
as
described
above.
NOTE
1:
Make
sure
that
the
L
C.D.,
the
display
unit
cover
and the
interconnection
rubber
are
placed
in
the
most right
hand
position,
(fig.
44
item
7).
NOTE 2:
Do
not
touch
the
contacts
of
the
L. C.D.,
the
interconnection
rubber
and
the display
unit
N3
with
the fingers.
2.2.2.
Function
switch,
(fig.
42)
Remove
the
top-
and
bottom
cover.
Remove
also
the front
assembly.
-
Bend
out
the
two
hooks
and
remove
the
printed-circuit
board,
(fig.
42
item
4).
—
The
function
switch
consist
of:
—
2 slide
bodies
—
4
springs
—
4
switch
contacts
—
Remove the
screws
and
nuts
from
the
slide
bodies.
The
bodies can
now
be
lifted
from the
printed-circuit
board.
NOTE:
The
slide
body
is
stocked
complete
with
springs
and
switch
contacts.
2.2.3.
Thermal
fuse
—
Remove
the
bottom
cover.
—
Remove the
four
screws
which
attach
the
screening
plate
of
the
transformer
to the
bottom
cover,
(fig.
45 item
1
).
-
Unsolder
the
black
wire
connecting
the
transformer
with the
screening,
(fig.
45 item
2).
-
Unsolder
the
connections
of
the
thermal
fuse. (fig.
45a. item
1).
-
Replace
the
thermal
fuse
as shown
in fig.
45a.
NOTE:
Do
not
replace
the
thermal
fuse
with
a piece
of wire
as this
gives
the
danger
of
a
fire
hazard.