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491 INSTALLATION MANUAL Revision A PAGE 21
SECTION FOUR — Troubleshooting and
servicing the 491
Common 491
installation
problems
Typical problems you may encounter either during or after the 491
installation process are outlined in Figure 12 on page 22 and Figure 13 on
page 23.
In the 961/962, the diagnostics screen may also help pinpoint a problem.
The status LED
The two-color LED located behind the 491’s front-panel STATUS window
displays the unit’s current condition.
The LED presents the following information:
• solid green: System has power, self-test passed, and communicating
with navigator.
• Flashing green: 491 is not communicating with the navigator.
• Red: Self-test failed