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2. Service

Assembly/Module Diagnostic Trees (Diagnostic Section 3)

110

3.6.5.0 A15J1 Power-Level Check

1 Connect A15J1 to a +2.5 Vdc power supply.

2 Check spectrum analyzer again and verify that amplitude has increased to at

least 0 dBm.

3 Disconnect power supply from A15J1 and reconnect internal cable to A15J1.

QUESTION: Did the amplitude on the spectrum analyzer increase

to at least 0 dBm?

If Yes: Go to, 3.6.6.0.

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

3.6.6.0 A15J2 Frequency-Range Test

1 Disconnect cable from A15J2.

2 Connect a 0 to +10 volt power supply to A15J2.

3 Vary voltage from 0 to +10V while watching signal on spectrum analyzer

connected to A15J5.

4 Verify that a frequency of 9192.6 MHz can be obtained with a voltage

between +2 and +8 Vdc.

QUESTION: Can frequency of 9192.6 MHz be obtained with a voltage

between +2 and +8 Vdc?

If Yes: Go to, A18 diagnostic tree in this section.

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

Symmetricom 5071A Assembly And Service Manual

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