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RF Section
A13 Second Converter
A13 Second Converter
The A13 assembly is extremely sensitive to Electrostatic Discharge
CAUTION
(ESD). For further information regarding electrostatic cautions, refer to
"Electrostatic Discharge"
1. Connect the spectrum analyzer CAL OUTPUT to the INPUT 50Ω
2. Set the spectrum analyzer to the following settings:
3. Disconnect W35 (coax 92) from A13J2.
4. Connect a test cable from A13J2 to the input of a second spectrum
5. Tune the second spectrum analyzer to 310.7 MHz. The signal
6. Remove the test cable from A13J2 and reconnect W35 to A13J2.
7. Disconnect W33 (coax 81) from A13J4 and connect W33 through a
8. Tune the second spectrum analyzer to a center frequency of
9. If a 600 MHz signal is not present, or its amplitude is less than
10.Reconnect W33 to A13J4.
11.Connect the positive lead of a DVM to A14J19 pin 15 and the
610
connector.
Center frequency ..................................................... 300 MHz
Span ................................................................................. 0 Hz
Input attenuation .......................................................... 10 dB
analyzer.
displayed on the second spectrum analyzer should be approximately
−38 dBm.
test cable to the input of a second spectrum analyzer.
600 MHz.
−5 dBm, the fault is probably on the A15 RF assembly.
negative lead to A14J19 pin 6.
If the DVM does not measure between +14.0 Vdc and +15.0 Vdc
perform the following:
a. Press
to turn the spectrum analyzer being tested, off and
LINE
disconnect W13 from A14J12.
b. Press
to turn the spectrum analyzer on again and set the it
LINE
to the following settings:
Center frequency ................................................ 300 MHz
Span ...................................................................... 10 MHz
in
Chapter 1 .
Chapter 12
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