
Source
Group
Troubleshooting
Appendix
Troubleshooting
Source
Problems
with
the
AnalogBus
The
analog
bus
can
p erform
a
v
ariety
of
fast
c
hec
ks.
Ho
w
ev
er,
it
to
o
is
sub
ject
to
failure
and
th
us
should
b e
tested
prior
to
use.
Y
ou
should
ha
v
e
done
this
in
Chapter
4,
\Start
T
roublesho oting
Here."
T
o
use
the
analog
bus
to
c
hec
k
an
y
one
of
the
no des,
press
4
PRESET
5
4
SYSTEM
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SERVICE
MENU
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ANALOG
BUS
IN
.
Then
press
4
MEAS
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
S
PARAMETERS
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ANALOG
IN
Aux
Input
and
en
ter
the
analog
bus
no de
n
um
b er
follo
w
ed
b
y
4
21
5.
Refer
to
\Analog
Bus"
in
Chapter
10,
\Service
Key
Men
us
and
Error
Messages,"
for
additional
information.
Phase
Lock
Diagnostic
T
ools
error
messages
diagnostic
routines
Phase
Lock
Error
Messages
All
phase
lo
c
k
error
messages
can
result
from
improp
er
fron
t
panel
connections.
NO
IF
FOUND:
CHECK
R
INPUT
LEVEL
means
no
IF
w
as
detected
during
pretune:
a
source
problem.
P
erform
the
\A4
Sampler/Mixer
Chec
k."
NO
PHASE
LOCK:
CHECK
R
INPUT
LEVEL
means
the
IF
w
as
not
acquired
after
pretune:
a
source
problem.
P
erform
the
\A4
Sampler/Mixer
Chec
k,"
earlier
in
this
c
hapter.
PHASE
LOCK
CAL
FAILED
means
that
a
calculation
of
pretune
v
alues
w
as
not
successful:
a
source
or
receiv
er
failure.
P
erform
the
\Source
Pretune
Correction
Constants"
routine
as
outlined
in
Chapter
3,
\Adjustmen
ts
and
Correction
Constants."
If
the
analyzer
fails
that
routine,
p erform
the
\A4
Sampler/Mixer
Chec
k."
PHASE
LOCK
LOST
means
that
phase
lo
c
k
w
as
lost
or
in
terrupted
b efore
the
band
sw
eep
ended:
a
source
problem.
Refer
to
\Phase
Lo c
k
Diagnostic
Routines"
next
to
access
the
phase
lo
c
k
lo
op
diagnostic
service
routine.
Then
troublesho
ot
the
problem
b
y
follo
wing
the
pro cedures
in
this
c
hapter.
Phase
Lock
Diagnostic
Routines
P
erform
the
following
steps
to
determine
at
what
frequencies
and
bands
the
phase
lo
c
k
problem
o ccurs.
1.
Press
4
PRESET
5
4
SYSTEM
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SERVICE
MENU
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SERVICE
MODES
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PLL
AUTO
OFF
to
switch
o
the
automatic
phase-lo c
k
ed
lo
op.
Normally
,
when
the
phase-lo c
k
ed
lo
op
detects
lo
c
k
problems,
it
automatically
ab orts
the
sw
eep
and
attempts
to
recalibrate
the
pretune
cycle.
Switching
o
PLL
A
UTO
defeats
this
routine.
2.
Press
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PLL
DIAG
ON
to
switch
on
the
phase-lo c
k
ed
lo
op
diagnostic
service
mo
de.
In
this
mo
de,
the
phase
lo
c
k
cycle
and
subsw
eep
n
um
b er
are
display
ed
on
the
analyzer
display
.
(See
\Service
Mo
des
Men
u"
in
Chapter
10,
\Service
Key
Men
us
and
Error
Messages,"
for
more
information.)
7-34
Source
Troubleshooting
DRAFT
3/21/106
15:13
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