Troubleshooting
If
the voltage
is greater
than 3
volts,
ensure
that
the
voltage
at
W8
pin
13
is
less
than
3
volts
.If
the voltage
at
W8
pin
13
is
greater
than
3
volts
,
trace
it to
its source
.If
the voltage
at
W8 pin
13 is
less
than
3
volts
,
replace
the
LO
synthesizer
and
reference
assembly.
LO
Synthesizer and
Reference Unlocked/Divide
V
oltage
Errors
Error
Group
Description
11
=
2
LO
Synth/Ref
Unlocked at
2.0 GHz
11
=
8
LO
Synth
Divide
V
oltage
at
2.385
GHz
11
=
10
LO
Synth/Ref
Unlocked
at
2.385
GHz
11
=
40
LO
Synth
Divide
V
oltage
at
2.121
GHz
11
=
80
LO
Synth/Ref
Unlocked
at
2.121
GHz
11 =
200
LO Synth
Divide V
oltage at
2.156
GHz
11
=
400
LO
Synth/Ref
Unlocked
at
2.156
GHz
11
=
1000
LO
Synth
Divide
Voltage
at 2.191
GHz
11
=
2000
LO
Synth/Ref
Unlocked
at
2.191
GHz
11
=
8000
LO
Synth
Divide
V
oltage
at
2.226
GHz
11
=
10000
LO
Synth/Ref
Unlocked
at
2.226
GHz
11
=
40000
LO
Synth
Divide
V
oltage
at
2.261
GHz
11
=
80000
LO
Synth/Ref
Unlocked
at
2.261
GHz
11 =
200000
LO Synth
Divide V
oltage
at
2.296
GHz
11
=
400000
LO
Synth/Ref
Unlocked
at
2.296
GHz
12
=
2
LO
Synth
Divide
V
oltage
at
2.023
GHz
12
=
4
LO
Synth/Ref
Unlocked
at
2.023
GHz
12
=
10
LO
Synth
Divide
V
oltage
at
2.025
GHz
12
=
20
LO
Synth/Ref
Unlocked
at
2.025
GHz
12
=80
LO
Synth Divide
Voltage
at
2.055
GHz
12
=
100
LO
Synth/Ref
Unlocked
at
2.055
GHz
12
=
400
LO
Synth
Divide
V
oltage
at
2.085
GHz
12
=
800
LO
Synth/Ref
Unlocked
at
2.085
GHz
12
=
2000
LO
Synth
Divide
V
oltage
at
2.115
GHz
12
=
4000
LO
Synth/Ref
Unlocked
at
2.115
GHz
12 =
10000
LO Synth/Ref
Unlocked at
2.385 GHz
12
= 40000
LO
Synth/Ref Unlocked
at 2.115
GHz
To Troubleshoot an LO Synthesizer/Reference Unlocked Condition
1. Install the LO synthesizer and reference assembly in the service position. Refer to the
procedure \LO (Local Oscillator) Synthesizer/Reference Board Assembly A6" in Chapter 5
of this manual.
2.
Connect a 10 MHz time base to the external reference inputs of the synthesizer and a
frequency counter
. Make sure the time base output power is between 0 dBm and +10
dBm.
3. Disconnect W10 from J4 on the LO synthesizer and reference assembly (A6) and connect J4
to the input of the frequency counter through a 20 dB attenuator.
4. Verify that the frequency at J4 is 3 MHz plus-or-minus one count.
Troubleshooting 1-13
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