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Fractional-N
V
CO
A
djustment
Note
The
fractional-N
V
CO
adjustment
is
not
normally
required.
If
this
board
has
been
replaced,
the
replacement
board
will
have
been
adjusted
at
the
factory
.
This
adjustment
should
only
be
performed
if
you
have
reason
to
believe
that
the
fractional-N
V
CO
assembly
is
not
functioning
properly
.
This
procedure
shows
you
how
to
adjust
the
frequency
of
the
fractional-N
V
CO
on
the
A3
fractional-N/reference
assembly
.
Caution
Place
the
analyzer
on
an
anti-static
mat
and
wear
a
connecting
wrist
strap
when
making
this
adjustment.
Required
Equipment
Equipment
Description
Recommended
Model
or
P
art
Number
Service
extender
board
part
of
service
kit,
08712-60012
Digital
voltmeter
any
Estimated
A
djustment
Time
This
adjustment
takes
approximately
ve
minutes
to
perform.
Procedure
1.
Switch
OFF
the
analyzer's
line
power
.
Remove
the
front
panel
by
following
these
steps
and
referring
to
Figure
2-1:
a.
Remove
the
trim
strip
from
the
handles
by
gently
prying
it
o
with
a
small
athead
screwdriver
.
b.
Remove
the
four
#15
TORX
screws
attaching
each
handle
to
the
analyzer
.
c.
Pull
the
analyzer
toward
you
until
the
chassis
extends
about
two
inches
over
the
edge
of
the
table
top
.
d.
Grasp
and
pull
the
front
panel
with
two
hands:
one
on
the
top-middle
of
the
panel,
and
the
other
on
the
bottom-middle
of
the
panel.
Once
the
front
panel
has
been
removed,
disconnect
the
front-panel
ribbon
cable
.
e.
Remove
the
two
#10
TORX
screws
attaching
the
handle
nut
plate
on
the
right
side
.
Adjustments
2-3
Содержание 87114B
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