HP 8753D Option 011 User Manual

A14
fractional-N digital
A19 graphics
pro cessor
(disconnect
W14,
A18W1,
and
W20)
4.
Switc
h
on
the
analyzer
and observ
ethe
green LEDs
on A8.
If
any
of the
green LEDs
are o
or ashing,
it
is
not
lik
ely
that
an
y
of
the
assem
blies
listed ab
o
v
e
is
causing
the
problem.
Con
tin
ue
to
\Briey Disable
the Sh
utdown
Circuitry
."
If
all green
LEDs are
now
on,
one
or
more
of
the
ab
o
v
e
assem
blies
ma
y
b
e
fault
y.
Con
tin
ue
to
next
step.
5.
Switc
h o
the analyzer.
6.
Reconnect
W14
and
W20
to
A19.
7.
Switc
h
on
the
analyzer
and
observ
e
the
LEDs.
If
the
LEDs are
o or
blinking, replace
the
A19
assem
bly
.
If
the
LEDs
are
still
on,
con
tin
ue
to
next
step.
8.
Switc
h
o
the
analyzer.
9.
Reconnect
A18W1
to
the
A19
assem
bly
.
10. Switc
h on
the analyzer
and observ
e
the
LEDs.
If
the LEDs
are o,
replace
the
A18
displa
y
.
If
the
LEDs
are
still
on,
con
tin
ue with
the next
step.
11.
Switc
h
o
the
analyzer.
12. Reinstall
eac
h
assem
bly
one
at
a
time.
Switc
h
on
the
analyzer
after
eac
h
assem
bly
is
installed.
The
assem
bly
that
causes
the
green
LEDs to
go
o
or
ash
could
b
e
fault
y
.
Note
It is
p
ossible,
ho
w
ev
er,
that
this
condition
is
caused
b
y
the
A8
p
ost
regulator
not
supplying
enough
curren
t.
To
chec
k
this,
reinstall
the
assem
blies
in
a
dieren
t
order
to
c
hange
the
loading.
If
the
same
assem
bly app
ears to
b
e
fault
y
,
replace
that
assem
bly
.
If
a
dieren
t
assem
bly
app
ears
fault
y,
A8 is
most
lik
ely fault
y (unless
both
of
the
other
assem
blies
are
fault
y).
Briefly
Disable
the
Shutdo
wn
Circuitry
In
this step,
y
ou
sh
utdo
wn
the
protectiv
e
circuitry
is
disabled
for a
short
time,
and
the
supplies are forced on (including shorted supplies) with a 100% dut
y cycle.
Caution
Damage to comp onen
ts or to circuit traces ma
y o ccur if A8TP4 (SDIS) is
shorted to c
hassis ground for more than a few seconds
while supplies are
shorted.
1. Connect A8TP4 (SDIS) to c
hassis ground with a jump er wire.
2. Switch on the analyzer and note the signal mnemonics and test p oints of anyLEDsthat
are o. Immediately remove the jumper wire .
3. Refer to the blo ck diagram (Figure 5-8) at the end of this chapter and do the following:
Note the mnemonics of any additional signals that may connect to any A8 test p ointthat
showed a fault in the previous step.
5-12 Power Supply Troubleshooting DRAFT
3/21/106 15:12
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HP 8753D Option 011 Specifications

General

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