6-4 888-2587-001 4/18/11
WARNING: Disconnect primary power prior to servicing.
FM HD Radio System
Section 6 Troubleshooting
6.3 Schematics, Wiring and Block Diagrams
The following Harris schematic and signal name conventions apply:
• Active Low = "/" - A signal name preceded by the forward slash is an active low.
Example: /TEMP_FAULT means the Temp Fault signal is active when at a low state
(also known as TEMP_FAULT ’not’, or TEMP_FAULT ’bar’).
• Schematic Continuation - A square block ending point of a named signal, accompa-
nied by a number-forward slash-letter-number is an indication of that signal continu-
ing on to another page of schematic.
Example: AUDIO 14/D1 - Indicates that the AUDIO signal will continue to page 14 of
same numbered schematic at a point where the X coordinate ’D’ meets the Y coordinate
’1’.
• LEDs used to display a given condition when illuminated are designated as DS(n),
with (n) indicating the LED’s designator value as shown on the board’s schematic
and silkscreen.
Example: DS4 is the Analog Mode Selected LED, indicating the Analog Mode is
currently selected when it is illuminated (External I/O board).
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