Agilent Technologies HP 83711B Service Guide

Troubleshooting
pins
, replace
the microprocessor
assembly.
If activity
is
seen
on
all
pins
,
replace
the
data
cable
(W9).
ABUS
Error
Error
Group
Description
14
=
1
Y
O/Oset
ABUS:
6
5
V
1.
Preset the
synthesizer
.
2.
Measure the
voltage
at
TP6
on
the
microprocessor
assembly
(A3)
with
a
voltmeter
(connect
the
voltmeter ground
lead to
A3TP4).
If
the
voltage
is
between
0
to
5
volts
,
continue
with
the
next step
.If
the
voltage
is
a
negative
voltage
,
continue
with
step
6.
3.
Use
the
direct
control
function
to
cause
the
analog
multiplexer
(U69)
on
the
Y
O
loop
and
oset
synthesizer
assembly
(A7)
to
switch
the
6
5
V
input
to
its
output.
a.
Press
4
SPCL
5
.
b.
Press
4
60
5
on
the
numeric
keypad,
then
terminate
the
entry
by
pressing
4
Hz
5
(ENTER).
c.
Press
4
66
5
on
the
numeric
keypad,
then
terminate
the
entry
by
pressing
4
Hz
5
(ENTER).
d. Press
4
3
5 on
the numeric
keypad,
then
terminate
the
entry
by
pressing
4
Hz
5 (ENTER).
4. Measure
the voltage
at TP6
on
the
microprocessor
assembly
.
If
the
voltage
is
1.35
V
6
0.65
V,
replace the
microprocessor
assembly
.
If
the
voltage
is
missing
or
out
of
tolerance
,
continue with
the next
step
.
5.
Measure
the
voltage
at
J3
pin
4
on
the
Y
O
loop
and
oset
synthesizer
assembly
.
The
voltage
should
be
2.5
V
6
1
V
.
If
it
is
missing
or
isn't
within
tolerance
,
replace
the
YO
loop
and
oset
synthesizer
assembly
.
If
it
is
within
tolerance
,
check
the
continuity
of
the
ABUS
cable
(W9)
with
an
ohmmeter
and
replace
it
if
necessary
.
6.
Use
the
direct
control
function
to
cause
the
analog
multiplexer
on
the
YO
loop
and
oset
synthesizer
assembly
to
switch
the
\no
connect"
input
to
its
output.
a.
Press
4
SPCL
5
.
b.
Press
4
60
5
on
the
numeric
keypad,
then
terminate
the
entry
by
pressing
4
Hz
5
(ENTER).
c.
Press
4
66
5
on
the
numeric
keypad,
then
terminate
the
entry
by
pressing
4
Hz
5
(ENTER).
d.
Press
4
0
5
on
the
numeric
keypad,
then terminate
the entry
by pressing
4
Hz
5
(ENTER).
7.
Measure
the
voltage
at
J3 pin
4 while
disconnecting the
ABUS cable
from
each
of
the
other
assemblies
(one
at
a
time).
The voltage
will change
to a
non-negative value
when
the
ABUS
cable
is
removed
from the
assembly that
is loading
the ABUS
down. Replace
the assembly
that
is
loading
the
ABUS
down.
If
no
change
is
noted
after
the
ABUS
cable
has
been
disconnected
from all assemblies
, replace the ABUS cable
.
Troubleshooting 1-17

Agilent Technologies HP 83711B Specifications

General

Brand	Agilent Technologies
Model	HP 83711B
Category	Test Equipment
Language	English