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2. Service

Assembly/Module Diagnostic Trees (Diagnostic Section 3)

108

3.6.2.0 320-MHz Signal Test

1 Adjust spectrum analyzer input attenuation for a +30 dBm. maximum signal.

2 Disconnect cable from A15J4.

3 Connect the free end of the cable to the spectrum analyzer.

4 Verify the presence of a 320-MHz signal with at least +18 dBm amplitude.

5 Reconnect cable to A15J4.

QUESTION: Does the analyzer show a 320-MHz signal with at least

+18 dBm amplitude?

If Yes: Go to, 3.6.3.0.

If No: Go to, 3.4.1.0 (A9 diagnostic tree).

3.6.3.0 A15J3 Signal Test

1 Disconnect coax cable from A18J4.

2 Connect free end of the cable to a spectrum analyzer with 50  input

impedance.

3 Verify the presence of a signal with frequency between 70 and

110 MHz and amplitude between -25 and -10 dBm.

4 Reconnect cable to A18J4.

QUESTION: Does the analyzer show a signal with frequency between

70 and 110 MHz and amplitude between -25 and -10

dBm.?

If Yes: Go to, 3.6.4.0.

If No: Remove power, replace A15, and retest.

Symmetricom 5071A Assembly And Service Manual

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