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5.
Check
C/N
ratio
measurement.
a.
Press
4
Meas
5 ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
CARRIER/NOISE
,
4
Bw/Avg
5 ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
OFFSET
FREQ
,
4
1
5 ,
4
k/m
5 .
b.
Conrm
that
the
reading
value
is
equal
to
,
or
greater
than
100
dBc
.
Record
the
result
(pass
or
fail)
as
RESUL
T(CN(1k)).
c.
Press
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
OFFSET
FREQ
,
4
1
5 ,
4
0
5 ,
4
k/m
5 .
d.
Conrm
that
the
reading
value
is
equal
to
,
or
greater
than
130
dBc
.
Record
the
result
(pass
or
fail)
as
RESUL
T(CN(10k)).
e.
Press
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
OFFSET
FREQ
,
4
1
5 ,
4
0
5 ,
4
0
5 ,
4
k/m
5 .
f.
Conrm
that
the
reading
value
is
equal
to
,
or
greater
than
140
dBc
.
Record
the
result
(pass
or
fail)
as
RESUL
T(CN(100k)).
6.
Decide
which
assembly
is
faulty
according
to
the
following
guideline
.
If
all
results
(RESUL
T(RF))
through
RESUL
T(CN(100k))
are
\F
AIL",
replace
the
A7
power
divider
assembly
.
If
only
RESUL
T(RF)
is
\F
AIL",
replace
the
A9
peak
detector
assembly
.
Otherwise
,
continue
with
the
next
step
.
5.
Check
A11
Thermometer
P
erform
the
following
steps
to
check
that
the
A11
thermometer
by
using
the
DC
BUS
function.
1.
Press
4
Preset
5 ,
4
System
5 ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SERVICE
MENU
,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SERVICE
MODES
,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
BUS
MEAS
[OFF]
,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
DC
BUS
[OFF]
,
4
5
5 ,
4
1
5 ,
4
x1
5 ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
BUS
MEAS
[off
ON]
,
NNNNNNNNNNNNNNNNNNNN
RETURN
,
NNNNNNNN
A3
,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
OUTPUT
SELECT
,
NNNNNNNNNNNNNN
TEMP
.
2.
Multiply
the
marker
reading
value
by
100.
Conrm
that
the
multiplied
value
is
within
the
range
of
-5
to
+60.
If
it
fails
,
replace
A11
thermometer
.
If
it
passes
,
continue
with
the
next
step
.
6.
Check
the
outputs
from
A10
1st
Mixer
P
erform
the
following
steps
to
measure
the
output
signals
from
the
A10
1st
Mixer
by
using
the
spectrum
analyzer
,
and
to
conrm
that
the
A8
RF
attenuator/A10
1st
Mixer
is
working
properly
.
1.
Turn
the
4352B
power
o.
2.
Connect
two
BNC
Cables
with
two
N(m)-BNC(f)
adapters
as
shown
in
Figure
8-6.
8-10
Receiver
Group
T
roubleshooting
Summary of Contents for 4352B
Page 11: ......
Page 31: ......
Page 73: ......
Page 80: ...Figure 3 4 List Box Menu Adjustments and Correction Constants 3 7 ...
Page 82: ...Figure 3 6 Reference Frequency Adjustment Location Adjustments and Correction Constants 3 9 ...
Page 85: ...Figure 3 9 Third IF AMP GAIN Adjustment Location 3 12 Adjustments and Correction Constants ...
Page 103: ...Figure 4 1 Troubleshooting Organization 4 2 Overall T roubleshooting ...
Page 113: ......
Page 130: ...Figure 5 11 Power Supply Block Diagram 1 Power Supply T roubleshooting 5 17 ...
Page 131: ...Figure 5 12 Power Supply Block Diagram 2 5 18 Power Supply T roubleshooting ...
Page 132: ...Figure 5 13 Power Supply Block Diagram 3 Power Supply T roubleshooting 5 19 ...
Page 133: ......
Page 135: ...Figure 6 1 Digital Control Group Simpli ed Block Diagram 6 2 Digital Control T roubleshooting ...
Page 146: ...Figure 7 2 Source Group Troubleshooting Flow Source Group T roubleshooting 7 3 ...
Page 154: ...Figure 8 2 Receiver Group Troubleshooting Flow Receiver Group T roubleshooting 8 3 ...
Page 198: ...Figure 10 1 Power Supply Functional Group Simpli ed Block Diagram Theory of Operation 10 3 ...
Page 203: ...Figure 10 3 Digital Control Group Simpli ed Block Diagram 10 8 Theory of Operation ...
Page 269: ......
Page 272: ...Figure B 1 Power Cable Supplied Power Requirement B 3 ...
Page 273: ......