2. Service
Functional-Group-Diagnostic Trees (Diagnostic Section 2)
79
2.3.6.0 9192 MHz Frequency Test
1 Disconnect the Microwave Test cable from the spectrum analyzer.
2 Connect to the input of a microwave-frequency counter.
3 Program the rear-panel output ports for 10 MHz.
4 Connect one output to the external reference input of the microwave
frequency counter.
5 Program the microwave frequency counter to use a 10 MHz external
reference instead of its internal timebase.
6 Measure the frequency of the microwave signal.
QUESTION: Is the indicated frequency 9192.631770 MHz 2 Hz?
If Yes: RF chain is operational.
If No: Go to, 2.3.7.0.
2.3.7.0 320 MHz Frequency and Amplitude Tolerance Test
1 Disconnect A9P1 from A9J1.
2 Connect A9J1 to the 50 input of an oscilloscope (Use a 50 feedthrough
at scope end of the cable if necessary.).
3 Verify presence of a sine-wave with at least 6.0 Vp-p amplitude.
4 Disconnect A9J1 from the oscilloscope.
5 Reprogram frequency counter to use 10 MHz external reference from 5071A
output.
6 Use the frequency counter to verify presence of a 320 MHz 0.1 Hz signal at
A9J1.
QUESTION: Did the measured signal comply with the required
characteristics?
If Yes: Go to, 2.3.8.0.
If No: Go to, 3.4.1.0 (A9 diagnostic tree).
2.3.8.0 87.36823 MHz Frequency and amplitude Test
1 Measure amplitude and frequency at A5J101 with an oscilloscope.
QUESTION: Is frequency 87.368230 MHz 0.1 Hz with an
amplitude of at least 0.4 Vp-p?
If Yes: Go to, 3.8.1.0 (A18 diagnostic tree).
If No: Go to, 2.3.8.1.
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