HP 8753D Option 011

Connecting
an oscilloscop
eto
A14J2 (lab
eled LO
OUT) and
lo oking
for
w
a
v
eforms
similar to
Figure 7-20
.
Figure
LO
W
AV27
here.
Figure
7-20. L
O
OUT
W
a
v
eform
at
A14J2
4. V
ary the
v
oltage
at
A14TP14
from
+10
to
0
5
v
olts
either
b
y:
Connecting
an
appropriate
external
p
o
w
er
supply
to A14TP14,
or
First
jumping
the
+15
V
in
ternal
p
o
w
er
supply
from
A8TP8
to
A14TP14
and
then
jumping the
0
5.2
V
supply
from
A8TP10
to
A14TP14.
5.
Conrm
that
the
V
CO
frequency
changes
from appro
ximately
30
MHz
or
less
to
60
MHz
or
more.
6. If
this
pro
cedure
pro
duces
unexp
ected
results,
the
A14
assem
bly
is
fault
y
.
7.
If
this
pro
cedure
pro
duces
the
exp
ected
results,
con
tin
ue
with
the
\A14
Divide-b
y-N
Circuit
Chec
k."
DRAFT
3/21/106 15:13
Source Troubleshooting 7-25
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