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White status light indicating that the LASAR ignition system is in back-up mode. The LASAR control unit operates the status light when the LASAR system is in back-up (manual) mode. The WARNING light, the CAUTION light, and the aural alert will not be activated. Refer to the equipment manufacturer's manuals for more data on the LASAR system.
) TRIM FAIL This light is only used when the autopilot system is installed.
Red warning light indicating a failure of the automatic trim system of the autopilot. The autopilot control unit activates the trim fail warning message when there is a failure of the automatic trim system of the autopilot.
) unused lights The White Wire annunciator panel has two lights for possible future use. These lights are currently unused.
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(4) Functional Check
The functional check is automatically started after switching the battery master switch ON. All lights are flashed, and the aural alert is muted. By pressing the 'acknowledge' button, the lights are extinguished, and a short aural alert is sounded. This test verifies functionality of the microprocessor, the lights, and the aural signal.
You may do additional system tests by holding the 'acknowledge' button for 2 seconds. All lights will begin flashing, and the aural alert will sound continuously.
(5) Wiring Diagrams
Refer to Chapter 92 for the wiring diagrams for the central warning systems.
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Trouble-Shooting
The table below lists the defects you could have with the Central Warning System. If you have the trouble detailed in the Trouble column read across to the Possible Cause column. Then do the repair given in the Repair column.
Trouble  Possible Cause  Repair 
Warning/Caution/Status indication incorrect.  Bulb or diode in Warning/Status/Caution lamp failed. Sensor defective. Annunciator unit defective. High resistance or open connection in the electrical wiring from the sensor.  DAI annunciator panel: replace the bulb. White Wire annunciator panel: Replace the annunciator panel. Replace the sensor. Replace the annunciator unit. Do resistance and continuity tests between the indicator and the sensor. Repair the defective connection or wire. 

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Maintenance Practices
1. General
This Section tells you how to replace the main components of the central warning system. Refer to the equipment manufacturer's manuals for more data on the annunciator panel. Refer to the relevant Chapter for data on the warning sensors.
Refer to Chapter 92 for the Wiring Diagrams.
2. Remove/Install the Annunciator Panel
A. Remove the Annunciator Panel
Detail Steps/Work Items  Key Items/References 
(1)  Remove the instrument panel cover.  Refer to Section 25-10. 
(2)  Disconnect the electrical cable from the annunciator panel.  At the in-line connector. 
(3)  Remove the 4 cross-head screws which attach the annunciator panel to the instrument panel.  Hold the annunciator panel. 
(4)  Move the annunciator panel out of the instrument panel and lift clear of the airplane. 

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B. Install the Annunciator Panel
Detail Steps/Work Items  Key Items/References 
(1)  Move the annunciator panel into its position in the instrument panel. 
(2)  Install the 4 cross-head screws which attach the annunciator panel to the instrument panel. 
(3)  Connect the electrical cable to the rear of the annunciator panel.  At the in-line connector. 
(4)  Install the instrument panel cover.  Refer to Section 25-10. 
　
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