2. Service
Functional-Group-Diagnostic Trees (Diagnostic Section 2)
80
2.3.8.1 131.771 kHz. Frequency Test
1 Disconnect coax from A5J2.
2 Connect a spectrum analyzer (HP/Agilent 8566) to the free end of the coax
(not to A5J2).
3 Adjust the spectrum analyzer to a center frequency of 131.7 kHz and a 10
kHz span.
4 Verify the presence of a 131.770 kHz signal with amplitude of at least -13.5
dBm.
5 Reconnect coax to A5J2.
QUESTION: Did the signal meet the characteristics in step 5?
If Yes: Go to, 2.3.8.2.
If No: Go to, 3.5.3.0 (A4 diagnostic tree).
2.3.8.2 80 MHz Frequency Test
1 Disconnect coax from A5J1.
2 Connect frequency counter to the free end of the coax (not to A5J1).
3 Verify the frequency as 80 MHz 0.1 Hz.
4 Use an oscilloscope to verify that the sine-wave voltage is at least
0.6 Vp-p.
5 Reconnect coax to A5J1.
QUESTION: Did the measured signal comply with the characteristics
in steps 3 and 4?
If Yes: Go to, 3.5.3.0 (A5 diagnostic tree).
If No: Go to, 3.4.1.0 (A9 diagnostic tree).
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