2. Service
Top-Level Diagnostic Tree (Diagnostic Section 1)
58
1.4.3 5071A Profiling (CBT Performance Evaluation)
The errors observed suggest deteriorating CBT performance.
1 Use the 5071A Profiling software as described at 1.6.0 to evaluate CBT
performance.
QUESTION: Did the CBT pass the profiling performance evaluation.
If Yes: CBT is operational.
If No: Remove instrument power, replace A17, and retest.
If the error persists contact Symmetricom for further assistance.
1.4.4 Power Source is Batt
(Note: Step 1.4.4 does not apply for Opt. 048)
If ac power is applied and this message appears, you must determine
whether the instrument is operating from the ac line or from the battery.
1 Disconnect both batteries from the 5071A by:
a. opening the rear battery compartment door, then
b. disconnect the two connectors to the batteries.
QUESTION: Does the instrument continue to operate or has all power
been lost?
If still operating, Go to, 1.4.4.1.
If power has been lost, Go to, 1.4.4.2.
1.4.4.1 AC-Line Operation - Battery Indicator On
(Fault is most likely in A11 power-steering-logic assembly).
1 Disconnect A11P102 from A11.
2 Verify that power-source indicator returns to normal with no indication of
battery operation.
QUESTION: Do the indicators return to normal (no indication
of battery operation)?
If Yes: A11 assembly is at fault, remove power, replace A11, and retest.
If No: Fault is in one or more of the following: swap-out in this order and
retest.
a. cable assembly (05071-60257),
b. A1 motherboard (circuit traces or connectors), or
c. A3 assembly.
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