Agilent Technologies 4395A Service Manual

POWER
FAILED ON
PostRegHot This
indicates A2
po
wer
supplies, +15
V,
+8.5
V,
+5.3
V,
+5 V,
-5 V,
-15
V,
are
sh
ut
do
wn
due
to
to
o
hot heat
sink
on
A2
p
ost-regulator.
Co
ol
down
the analyzer
for ab
out 30
min
utes. Then
turn the
analyzer p
ow
er on.
If
this
message
is still
displa
y
ed,
replace
A2
p
ost-regulator.
PHASE
LOCK
LOOP
UNLOCKED
This
indicates
one
or
some of
PLLs (phase
lo c
klo
ops)
in
the
oscillators is
not w
orking prop
erly
.
These
oscillators
are
c
hec
k
ed
in
the
in
ternal
test
0:
ALL
INT.
Con
tin
ue
with the
next
Che
ck
the
Power
On
Selftest in
where the
ALL INT
test
is executed.
3.
Check
the
A1
DRAM and
Flash Memory
The
A1
DRAM
and ash
memory are
tested on
the
sequence
to
access
the
b
o
otloader
men
u.
P
erform
the follo
wing pro
cedure to
verify
the
A1
DRAM
and
ash
memory
.
a. T
urn
the
analyzer
p
o
w
er
o.
b.
Push
t
w
o
k
eys
4
Sta
rt
5
and
4
Preset
5
.
With
k
eeping
the
t
w
o
k
eys
pushed do
wn, turn
the
analyzer
p
o
w
er
on.
c.
W
ait
for
the
displa
y
sho
wn
in
Figure
8-6
app
ears
on
the
LCD.
d.
Check
no error
message
displa
y
ed
on
the
LCD.
If
no
error
message
is
displa
y
ed,
the
A1
DRAM and
ash
memories
are
v
eried.
Con
tin
ue
with
the
next
Che
ck
the
A1
V
olatile
Memory
.
If an
error
message
is
displa
y
ed
or
the
displa
y
sho
wn
in
Figure
8-6
do
es
not
app
ear,
the
A1
CPU
is
probably
fault
y
.
Replace
the A1
CPU.
8-8 Digital Control Troubleshooting

Agilent Technologies 4395A Specifications

General

Brand	Agilent Technologies
Model	4395A
Category	Measuring Instruments
Language	English