2. Service
Assembly/Module Diagnostic Trees (Diagnostic Section 3)
109
3.6.4.0 A15J5 Signal Test
1 Disconnect semi-rigid coax cable from CBT.
2 Disconnect cable from A15J1.
3 Connect semi-rigid coax cable to an HP/Agilent 8566B microwave spectrum
analyzer using appropriate microwave coaxial test cable
(GoreTex 32R01R01048.0).
4 Verify the presence of a signal with no sidebands between 9180 and 9205
MHz, having an amplitude between -10 and -30 dBm. (Account for the
microwave test-cable signal loss in your calculations.)
QUESTION: Is signal frequency between 9180 and 9205 MHz with an
amplitude between -10 and -30 dBm with no sidebands
present?
If Yes: Go to, 3.6.5.0.
If No: Go to, 3.6.4.1.
3.6.4.1. A15J5-CBT Cable Test
1 Remove four mounting nuts for A15.
2 Slide A15 out far enough to create the clearance required to remove the
semi-rigid coax from A15J5.
3 Remove the semi-rigid coax from A15J5.
4 Connect A15J5 to an HP/Agilent 8566B microwave spectrum analyzer
(or equiv.) using an appropriate microwave coaxial-test cable
(e.g.: GoreTex)
5 Verify presence of a signal between 9180 and 9205 MHz, with an amplitude
of at least 0 dBm, and no discernible sidebands. (Account for microwave-test
cable loss.)
QUESTION: Does the spectrum analyzer show a signal between
9180 and 9205 MHz, with an amplitude of at least
0 dBm, and no discernible sidebands?
If Yes: Remove power, replace A15J5-CBT cable, and retest.
If No: Remove power, replace A15, and retest.