If
the
output
at
A8J6
is
missing
or
m
uc
h
low
er
than
t
ypical,
replace
the
A8
Clo
c
k
b oard.
UNABLE
TO
LOCK
TO
EXT
10
MHZ
REF.
Indicates
the
10
MHz
external
input
to
the
HP
85102
A6
clo
c
k
assem
bly
is
more
than
+500
Hz
o
frequency
.
The
lev
el
should
b e
>
0
dBm.
If
the
external
input
is
o
frequency
or
is
less
than
0
dBm,
the
A6
assem
bly
sets
the
LIFSR
Q
low,
alerting
the
CPU
to
the
unlo c
k
ed
condition.
This
message
is
not
applicable
unless
y
ou
are
lo
c
king
to
an
external
source
suc
h
as
in
a
m
ultiple
source
net
w
ork
analyzer
system.
If
this
error
message
o ccurs
when
the
external
10
MHz
input
is
not
used,
the
probable
causes
of
failure
are:
A6
clo
c
k
assem
bly
erroneously
sets
LIFSR
Q
low
The
A6
clo
c
k
LIFSR
Q
signal
is
pulled
low
along
the
w
a
y
to
the
HP
85101
A5
CPU
+5V
input
to
the
HP
85102
A6
clo
c
k
is
in
termittent
T
roublesho oting:
Run
HP
85102
Service
Program
tests
in
the
\run
all"
mo
de
Chec
k
the
10
MHz
input
signal
frequency
and
amplitude
that
y
ou
are
applying
to
the
rear
panel
of
the
HP
85102
Refer
to
y
our
source
troublesho
oting
man
ual
for
the
10
MHz
RF
output
lev
el
4.
Use
Specific
Procedures
for
Certain
Symptomatic
F
ailures
If
the
symptoms
of
the
failure
are
only
presen
t
when
the
system
is
op erating
in
the
wide
BW,
pulsed-RF
mo
de,
the
follo wing
pro cedures
may
help
determine
the
failure.
If
the
symptoms
are
presen
t
in
b oth
wide
BW
pulsed-RF
and
normal
BW
nonpulsed-RF
op eration,
go
to
the
troublesho
oting
section
of
the
HP
8510C
Service
man
ual
for
troublesho
oting
information.
P
o
w
er
loss,
po
w
er
holes,
and
frequency
related
problems.
Use
the
\Unratio
ed
P
o
w
er
Lev
els
c
hec
k"
in
the
HP
8510C
Op erating
and
Service
Manual.
Calibration
and
V
erification
problems.
F
ailure
to
pass
v
erication
of
the
40
or
50
dB
attenuators
while
passing
the
20
dB
attenuator,
airline,
and
stepp ed
imp edance
standard
may
b e
caused
b
y
incorrect
setting
of
the
oset
frequency
for
source
2
in
the
m
ultiple
source
setup.
The
correct
oset
frequency
is
20.000017
MHz.
Softw
are/firmw
are
problems.
If
y
our
hardw
are
app ears
to
b e
w
orking
prop erly
but
the
system
is
not
w
orking
the
w
a
y
y
ou
exp ect
it
to,
reload
the
op erating
system
softw
are.
If
this
do es
not
correct
the
problem,
y
ou
may
ha
v
e
encoun
tered
a
softw
are
\bug".
Determine
the
exact
k
ey
sequence
and/or
setup
that
causes
the
failure
and
then
con
tact
HP
for
assistance.
System
Service
and
Troubleshooting
6-7
All manuals and user guides at all-guides.com
Summary of Contents for 85108A
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