Icom IC-R8500 Service Manual page 7

•
CR-293 HIGH STABILITY
CRYSTAL
UNIT
©
Remove
the
bottom cover as
shown
in
the previous page.
@
Unscrew
6 screws as
shown
in
the diagram, then
remove
the shield plate
and PLL
cover.
®
Unscrew
1
0 screws from
the
PLL
unit
then
open
the
unit
to
expose
the bottom.
®
Unsolder the feet of the internal crystal
unit,
then
remove
it.
<f)
Place the CR'293
in
the
space
available
as
shown
iq
the
diagram, then solder
its
feet
into
place
(6 points).
®
Adjust the reference
frequency using
a frequency
counter.
Ground
spring
n
n
63
0
Replace
the
ground
spring
to
its
original position.
®
Return
the
PLL
cover, shield plate
and bottom cover
to
their original positions.
I
NOTE: The CR-293
is
an
oven-type
crystal
unit,
and
the specified
frequency
stability
described
above
is
guaranteed
1
min.
after
power ON.
3'2