2. Service
Top-Level Diagnostic Tree (Diagnostic Section 1)
57
Warning Message Diagnostic Tree
(Subsection 4)
This subsection describes the warning-message diagnostic tree.
1.4.1 Warning Message Interpretation
1 Examine the log for any of the following entries (LOG/BROWSE menu
selections) (Assembly/Module trees are located in diagnostic tree section 3.)
QUESTION: What is the warning message?
If WARNING is:
VCXO near tuning limit, Go to, 3.9.1.1.
If WARNING is:
Signal gain at range limit, Go to, 1.4.2.
If WARNING is:
Internal DC supply out of range, Remove power,
replace A7, and retest.
If WARNING is:
Microprocessor PLL unlocked, Remove power,
replace A3, and retest.
If WARNING is:
CBT signal low, Go to, 1.4.3.
If WARNING is:
Power source is Batt, Go to, 1.4.4.
If WARNING is:
RF amplitude at range limit, Go to, 1.3.7.
(Warning 21 relates to factory testing and will typically not occur during
actual use.)
1.4.2 Signal Gain at Range Limit/CBT Signal Low
1 Perform A16 Electron-multiplier tests (3.7.2.1).
2 Perform analog-signal-chain tests (2.2.1.0).
3 Replace assemblies/modules as indicated.
QUESTION: Did all tests/evaluation pass?
If Yes: Ignore Warning, a transient error may have occurred: Go to 1.4.3.
If No: Remove power, repair as indicated, and retest: Go to 1.4.3.
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