5
Troubleshooting
Introduction
This
chapter
contains
information
about
HP
70310A
module
front-panel
LEDs
,
and
a
listing
of
the
error
codes
for
the
HP
70310A
module
.
The
information
in
this
chapter
is
designed
to
help
determine
whether
an
error
is
being
caused
by
the
HP
70310A
module
.
F
or
more
detailed
HP
70310A
troubleshooting
information,
refer
to
the
HP
70310A
Precision
Frequency
R
eference
Service
Manual.
If
the
error
is
not
caused
by
the
HP
70310A
module
,
refer
to
the
Installation
and
V
erication
Manual
for
the
system
master
(for
example
,
HP
70900A)
for
more
troubleshooting
information.
Status/Error
LEDs
The
HP
70310A
Precision
Frequency
Reference
has
ve
front-panel
LEDs
.
A
CT
and
EXTERNAL
REF
are
status
LEDs
.
ERR,
O
VEN
COLD
,
and
PLL
ERROR
are
error
LEDs
.
All
of
the
LEDs
light
during
self-test;
other
reasons
for
the
LEDs'
lighting
are
given
below
.
The
A
CT
(active)
LED
lights
when
the
module
is
activated
by
an
HP
70000
Modular
Measurement
System
master
.
The
ERR
(error)
LED
lights
when
there
is
an
error
condition.
The
O
VEN
COLD
LED
lights
when
the
internal
oven/oscillator
assembly
is
not
warmed
up
to
operating
temperature
.
The
external
power
pack
provides
power
for
the
heater
in
the
internal
oven/oscillator
assembly
to
help
maintain
the
correct
operating
temperature
when
the
instrument
is
turned
o.
If
the
external
power
pack
is
not
plugged
in,
or
if
it
has
an
open
fuse
,
the
temperature
may
not
be
maintained
in
the
internal
oven/oscillator
assembly
and
the
O
VEN
COLD
LED
will
light.
The
O
VEN
COLD
LED
should
not
light
in
HP
70310A
Option
002
modules
(internal
oven/oscillator
assembly
deleted).
The
EXTERNAL
REF
LED
lights
when
an
appropriate
external
reference
signal
is
connected
to
the
rear-panel
EXT
REF
input.
The
PLL
ERROR
LED
lights
when
the
reference
signal
(internal
or
external)
is
either
absent
or
incorrect.
An
external
reference
signal
must
be
used
with
HP
70310A
Option
002
modules
.
T
roubleshooting
5-1
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