
Line
P
o
w
er
Module
The
line
p o
w
er
mo
dule
includes
the
line
p o
w
er
switch,
v
oltage
selector
switch,
and
main
fuse.
The
line
p o
w
er
switch
is
activ
ated
from
the
fron
t
panel.
The
v
oltage
selector
switch,
accessible
at
the
rear
panel,
adapts
the
analyzer
to
lo
cal
line
v
oltages
of
appro
ximately
115
V
or
230
V
(with
350
V
A
maximum).
The
main
fuse,
whic
h
protects
the
input
side
of
the
preregulator
against
dra
wing
to
o
m
uc
h
line
curren
t,
is
also
accessible
at
the
rear
panel.
Refer
to
the
HP
8753D
Network
A
nalyzer
Instal
lation
and
Quick
Start
Guide
for
line
v
oltage
tolerances
and
other
p o
w
er
considerations.
Preregulated
V
oltages
The
switching
preregulator
con
v
erts
the
line
v
oltage
to
sev
eral
DC
v
oltages.
The
regulated
+5
V
digital
supply
go
es
directly
to
the
motherb oard.
The
following
partially
regulated
v
oltages
are
routed
through
A15W1
to
the
A8
p ost
regulator
for
nal
regulation:
+70
V
+25
V
+18
V
018
V
+8
V
08
V
Regulated
+5
V
Digital
Supply
The
+5VD
supply
is
regulated
b
y
the
con
trol
circuitry
in
the
A15
preregulator.
It
go
es
directly
to
the
motherb oard,
and
from
there
to
all
assem
blies
requiring
a
low
noise
digital
supply
.
A
+5
V
sense
line
returns
from
the
motherb oard
to
the
A15
preregulator.
The
+5V
CPU
is
deriv
ed
from
the
+5VD
in
the
A8
p ost
regulator
and
go
es
directly
to
the
A19
graphics
system
pro cessor.
In
order
for
the
preregulator
to
function,
the
+5
V
digital
supply
m
ust
b e
loaded
b
y
one
or
more
assem
blies,
and
the
+5
V
sense
line
m
ust
b e
w
orking.
If
not,
the
other
preregulated
v
oltages
will
not
b e
correct.
Shutdo
wn
Indications:
the
Green
LED
and
Red
LED
The
green
LED
is
on
in
normal
op eration.
It
is
o
when
line
p o
w
er
is
not
connected,
not
switched
on,
or
set
to
o
low,
or
if
the
line
fuse
has
blown.
The
red
LED,
whic
h
is
o
in
normal
op eration,
lights
to
indicate
a
fault
in
the
+5
V
supply
.
This
may
b e
an
o
v
er/under
line
v
oltage,
o
v
er
line
curren
t,
or
o
v
ertemp erature
condition.
Refer
to
the
troublesho
oting
c
hapters
for
more
information.
A8
P
ost
Regulator
The
A8
p ost
regulator
lters
and
regulates
the
DC
v
oltages
receiv
ed
from
the
A15
preregulator.
It
pro
vides
fusing
and
sh
utdo
wn
circuitry
for
individual
v
oltage
supplies.
It
distributes
regulated
constan
t
v
oltages
to
individual
assem
blies
throughout
the
instrumen
t.
It
includes
the
o
v
ertemp erature
sh
utdo
wn
circuit,
the
v
ariable
fan
sp eed
circuit,
and
the
air
o
w
detector.
Nine
green
LEDs
pro
vide
status
indications
for
the
individual
v
oltage
supplies.
Refer
to
the
P
o
w
er
Supply
Blo
c
k
Diagram
lo
cated
at
the
end
of
Chapter
5,
\P
o
w
er
Supply
T
roublesho oting,"
to
see
the
v
oltages
pro
vided
b
y
the
A8
p ost
regulator.
V
oltage
Indications:
the
Green
LEDs
The
nine
green
LEDs
along
the
top
edge
of
the
A8
assem
bly
are
on
in
normal
op eration,
to
indicate
the
correct
v
oltage
is
presen
t
in
eac
h
supply
.
If
they
are
o
or
ashing,
a
problem
is
DRAFT
3/21/106
15:14
Theory
of
Operation
12-5
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