
A12
Digital
Control
Signals
Check
Sev
eral
digital
con
trol
signals
m
ust
b e
functional
for
the
A12
assem
bly
to
op erate
prop erly
.
Chec
k
the
con
trol
lines
listed
in
T
able
7-4
with
the
oscilloscop
e
in
the
high
input
imp edance
setting.
T
able
7-4.
A12-Related
Digital
Control
Signals
Mnemonic
Signal
Description
Lo cation
See
Figure
Analyzer
Setting
L
ENREF
L=Reference
Enable
A12P2-16
Figure
7-15
Preset
L
HB
L=High
Band
A12P2-32
Figure
7-16
Preset
L
LB
L=Lo
w
Band
A12P1-23
Figure
7-16
Preset
L
ENREF
Line.
This
is
a
TTL
signal.
T
o
observ
e
it,
trigger
on
the
negative
edge.
In
preset
state,
the
signal
should
sho
w
activit
y
similar
to
Figure
7-15.
Figure
ENREF7
here.
Figure
7-15.
L
ENREF
Line
at
A12P2-16
(Preset)
DRAFT
3/21/106
15:13
Source
Troubleshooting
7-21
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