HP 8753D Option 011

Figure LED5
here.
Figure
5-2.
Location
of
A15
Diagnostic
LEDs
Check the
Green
LEDs
on
A8
Remo
v
e
the
top
co
v
er
of
the
analyzer
and
lo
cate
the
A8 p
ost
regulator;
use
the
lo
cation
diagram
under
the
top
co
v
er
if
necessary
.
Chec
k
to
see
if
the
green
LEDs
on
the
top
edge
of
A8
are
all
on.
There
are nine
green
LEDs
(one
is
not
visible
without
remo
ving
the
PC
b
oard
stabilizer).
If
all
of
the
green
LEDs
on
the
top
edge
of
A8
are
on,
there
is
a
95%
condence
lev
el that
the
p
ow
er supply
is
v
eried.
T
o
conrm
the
last
5%
uncertain
t
y
of
the
p
o
w
er
supply
,
refer
to
\Measure
the
P
ost
Regulator
V
oltages"
(next).
If
an
y
LED
on
the
A8
p
ost
regulator
is
o
or
ashing,
refer to
\If the
Green LEDs
on A8
are not
All ON"
in
this
pro
cedure.
Measure
the
P
ost
Regulator
Voltages
Measure
the DC
voltages
on the
test p
oints
of A8
with a
v
oltmeter.
Refer
to
Figure
5-3
for
test poin
t lo cations and T
able 5-1 for supply v
oltages
and limits.
5-4 Power Supply Troubleshooting DRAFT
3/21/106 15:12
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