
YO
Coil
Driv
e
Check
with
Oscilloscope
Note
Use
the
large
extender
b oard
for
easy
access
to
the
v
oltage
p oints.
The
extender
b oard
is
included
with
the
HP
8753
T
o ol
Kit.
See
Chapter
13,
\Replaceable
P
arts,"
for
part
n
um
b ers
and
ordering
information.
1.
Connect
oscilloscop
e
prob es
to
A11P1-1
and
A11P1-2.
The
YO
coil
driv
e
signal
is
actually
t
w
o
signals
whose
v
oltage
dierence
driv
es
the
coil.
2.
Press
4
PRESET
5
4
SYSTEM
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SERVICE
MENU
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SERVICE
MODES
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SOURCE
PLL
OFF
to
op erate
the
analyzer
in
a
sw
ept
op en
lo
op
mo
de.
3.
Monitor
the
t
w
o
YO
coil
driv
e
lines.
In
source
tune
mo
de
the
v
oltage
dierence
should
v
ary
from
appro
ximately
3.5
to
5.0
v
olts
as
sho
wn
in
Figure
7-7 .
If
the
v
oltages
are
not
correct,
replace
the
faulty
A11
assem
bly
.
If
the
output
signals
from
the
A11
assem
bly
are
correct,
replace
the
fault
y
A3
source
assem
bly
.
If
neither
the
A11,
nor
the
A3
assem
bly
is
faulty
,
con
tinue
with
the
next
c
hec
k.
Figure
VDIFF7
here.
Figure
7-7.
YO0
and
YO+
Coil
Driv
e
V
oltage
Differences
with
SOURCE
PLL
OFF
A12
Reference
Check
The
signals
are
ev
aluated
with
pass/fail
c
hec
ks.
The
most
ecien
t
w
a
y
to
c
hec
k
the
A12
frequency
reference
signals
is
to
use
the
analog
bus
while
referring
to
T
able
7-2 .
Alternativ
ely
,
y
ou
can
use
an
oscilloscop
e,
while
referring
to
T
able
7-3
and
Figure
7-8
through
Figure
7-14 .
If
an
y
of
the
observ
ed
signals
dier
from
the
gures,
there
is
a
90%
probabilit y
that
the
A12
assem
bly
is
fault
y
.
Either
consider
the
A12
assem
bly
defectiv
e
or
p erform
the
\A12
Digital
Con
trol
Signals
Chec
k."
Both
of
these
pro cedures
are
describ ed
b elow.
DRAFT
3/21/106
15:13
Source
Troubleshooting
7-11
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