Agilent Technologies 4395A Service Manual

FIND
OUT WHY
THE A1
+5
VD
LED
IS
NOT
ON
STEADIL
Y
If the
+5 VD
LED
is
not
on
steadily
,
the
+5
VD
line
v
oltage is
missing or
is not
enough
to
p
o
w
er
the
analyzer. The
problem ma
yb
ein
the A40
pre-regulator, the
A50 DC-DC
Con
verter,
the A1
CPU, and
any
of assem
blies
obtaining
the
p
o
w
er
from
+5
VD
supply
.
1.
Check
the
A40
Pre-Regulator
a.
Turn
the analyzer
po
w
er
o.
b.
Disconnect
a
cable
form
the
A50J1.
The
A50J1
lo
cation
is
sho
wn
in
Figure 7-6
.
c.
T
urn
the
analyzer
p
ow
er on.
d.
Check
the v
oltage
b
et
w
een
the
pin
1
and
pin
6(GND)
of
the
cable
within
+22.0
V
to
+27.0
V
using
a
v
oltmeter
with
a
small
prob
e.
If
the
v
oltmeter
reading
is
out of
the limits,
replace the
A40 pre-regulator.
If
the v
oltmeter
reading
is
within
the
limits,
the
A40
pre-regulator
is
v
eried.
T
urn
the
analyzer
p
o
w
er
o
and
reconnect
the
cable
to
the
A50J1.
Then
con
tin
ue
with
the
next
Che
ck the
A50 DC-DC
Converter section.
Figure 7-6. A40J1 Output V
oltage
2. Check the A50 DC-DC Conv
erter
a. T
urn the analyzer po
wer o.
b. Disconnect
a cable form the A50J3. The A50J3 lo cation is sho
wn in Figure 7-6 .
c. Turn the analyzer p ower on.
d. Check the voltage between the A50J3 pin 1 and pin 6(GND) within +4.59 V to +5.61 V
using a voltmeter with a small prob e.
If the voltmeter reading is out of the limits, replace the A50 DC-DC Converter.
Power Supply Troubleshooting 7-9

Agilent Technologies 4395A Specifications

General

Brand	Agilent Technologies
Model	4395A
Category	Measuring Instruments
Language	English