HP 8753D Option 011 User Manual

A14 Divide-b
y-N Circuit
Check
Note
The
A13 assem
bly should
still
b
e
out
of
the
instrumen
t
and
the
A14
assembly
on
an
extender
b
oard.
1.
Ground A14TP14
and
conrm
(as
in
the
A14
V
CO
Exercise)
that
the
V
CO
oscillates
at
appro
ximately
50
to
55
MHz.
2.
Put
the analyzer
in CW
mo de
(to a
v
oid
relo
c
k
transitions)
and
activ
ate
the
FRA
CN
TUNE
service
mo
de.
3.
Connect
an
oscilloscop
e
to A14J3
and observ
ethe
output.
4. With
the FRA
CN
TUNE
service
feature,
v
ary
the
frequency
from
30
MHz
to
60.8
MHz.
5.
The
p
erio
d
of
the
observ
ed
signal
should
v
ary
from
5.5 
sto
11 
s.
If
this
pro
cedure
pro
duces unexp
ected results,
the A14
assembly
is
fault
y
.
If
this
pro
cedure pro
duces
the
exp
ected
results,
p
erform
the
\A14-to-A13
Digital
Con
trol
Signals
Chec
k."
6.
Rememb
er to
replace the
A13
assem
bly
.
A14-to-A13
Digital
Control
Signals
Check.
The
A14
assem
bly
generates
a
TTL
cycle
start
(CST)
signal
ev
ery
10 microseconds.
If the
V
CO
is
oscillating
and
the
CST
signal
is
not
detectable
at
A14TP3,
the
A14
assem
bly
is
non-functional.
Use
the
CST
signal
as an
external
trigger
for
the
oscilloscop
e
and
monitor
the
signals
in
T
able
7-6
. Since
these
TTL
signals
are
generated
b
y
A14
to
con
trol
A13,
c
hec
k
them
at
A13
rst.
Place
A13
on
the
large
extender
b
oard.
The
signals should
lo ok
similar
to
Figure
7-21
.
If
these
signals
are
go
o
d,
the
A13
assem
bly
is
defectiv
e.
T
able
7-6.
A14-to-A13
Digital Control
Signal Locations
Mnemonic A13 Lo
cation
A14 Lo
cation
CST none TP3
L FNHOLD P2-2 P2-2
FNBIAS P2-5 P2-5
API1 P2-32 P2-32
API2 P2-3 P2-3
API3 P2-34 P2-34
API4 P2-4 P2-4
API5 P2-35 P2-35
NLATCH P1-28 P1-58
7-26 Source Troubleshooting DRAFT
3/21/106 15:13
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HP 8753D Option 011 Specifications

General

Brand	HP
Model	8753D Option 011
Category	Measuring Instruments
Language	English