HP 8753D Option 011 User Manual

If
the Green
LEDs on
A8
are
not
All
ON
The green
LEDs along
the
top
edge
of
the
A8
p
ost
regulator
are
normally
on.
Flashing
LEDs on
A8
indicate
that
the
sh
utdo
wn
circuitry
on
the
A8
post
regulator is
protecting
p
o
w
er
supplies from
ov
ercurrent
conditions b
yrep
eatedly sh
utting them
do
wn.
This ma
yb
e caused
by
supply
loading
on
A8
or
on
an
y
other
assem
bly
in
the
analyzer.
Remo
v
e
A8,
Maintain
A15W1
Cable
Connection
1. Switc
h o
the analyzer.
2.
Remo
v
e
A8
from
its
motherb
oard
connector,
but
k
eep
the
A15W1 cable
connected to
A8.
3.
Remo
v
e
the
displa
y
po
wer
cable W14.
See
Figure
5-5
.
4. Short
A8TP2 (A
GND)
(see
Figure
5-3
)
to
c
hassis
ground
with
a
clip
lead.
5.
Switc
h
on
the
analyzer
and
observ
e
the
green
LEDs
on
A8.
If
an
y
green
LEDs
other
than
+5VD
are
still
o
or
ashing, con
tin
ue
to
\Chec
k
the
A8
F
uses
and
V
oltages."
If
all
LEDs
are
no
w
on
steadily
except
for
the
+5VD
LED,
the
A15
preregulator
and
A8
p
ost regulator
are w
orking
prop
erly
and
the
trouble
is
excessiv
e
loading
somewhere
after
the
motherb
oard
connections
at
A8.
Con
tin
ue to
\Remov
e
the
Assem
blies."
Check
the
A8
Fuses
and
V
oltages
Chec
k
the
fuses
along
the
top
edge
of
A8.
If
an
y
A8
fuse
has
burned
out,
replace
it. If
it
burns
out
again when
p
o
w
er
is
applied
to
the
analyzer,
A8
or
A15
is
fault
y
.
Determine
whic
h
assem
bly
has
failed
as
follo
ws:
1.
Remo
v
e
the
A15W1
cable
at
A8.
See
Figure
5-5
.
2. Measure
the v
oltages
at
A15W1P1
(see
Figure
5-6
)
with
a
v
oltmeter
ha
ving
a
small
prob
e.
3.
Compare the
measured
v
oltages
with
those
in
T
able
5-2
.
If
the
v
oltages
are within
tolerance, replace
A8.
If
the
v
oltages
are
not
within
tolerance,
replace
A15.
4.
If
the
green LEDs
are
no
w
on,
the
A15
preregulator
and
A8
p
ost regulator
are
w
orking
properly and the trouble is excessiv
e loading somewhere after the motherb oard connections
at A8. Con
tinue to \Remo
ve
the Assem
blies."
Remove the Assemblies
1.
Switch o the analyzer.
2. Install A8. Remo
ve the jump er from A8TP2 (A
GND) to c
hassis ground.
3. Remove or disconnect all the assemblies listed b elow. See Figure 5-5 . Always switch o
the analyzer beforeremoving or disconnecting an assembly.
A10 digital IF
A11 phase lo ck
A12 reference
A13 fractional-N analog
DRAFT
3/21/106 15:12
Power Supply Troubleshooting 5-11
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HP 8753D Option 011 Specifications

General

Brand	HP
Model	8753D Option 011
Category	Measuring Instruments
Language	English