NorthStar Navigation 491 Section Four Troubleshooting and servicing, Status LED

SECTION FOUR — Troubleshooting and servicing the 491

Common 491 installation problems

The status LED

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 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

491 INSTALLATION MANUAL Revision A PAGE 21