Install Manual

Preliminary
SKY899
Installation Manual
3-8
Rev. A
3. After approximately thirty seconds, observe the STANDBY screen and then press the TEST button
(soft-key (2)).
4. The display should present a screen similar to that shown in figure 3-5.
BRT
OFF
Figure 3-5. Self Test Screen
5. If the SKY899 passes the self-test, the system will return to the STANDBY screen (see figure 3-3) and
the voice message, "SKYWATCH SYSTEM TEST PASSED," will be enunciated over the cockpit audio
system.
6. If you do not hear the voice message or if the voice message is of insufficient volume:
a. Check headphones/speaker and aircraft audio panel switch settings.
NOTE
Audio levels can be adjusted via the service menu and at the aircraft audio
panel. There is no internal audio adjustment.
b. Reset the audio level via the service menu (see paragraph 4.4.1.3).
c. Check audio connection to the TRC:
1) 600-ohm audio systems should be connected to P1-89 (AUDIO_H).
2) 150-ohm audio systems should be connected to P1-90 (AUDIO_L).
3) Audio common is connected to P1-91 (AUDIO_C).
NOTE
Audio output from the TRC is transformer isolated.
7. If SKY899 fails the self-test:
a. The "SKY899 Failed" screen with an error message indicating the type of failure will be
displayed.
b. The voice message, "SKYWATCH SYSTEM TEST FAILED", will be enunciated over the cockpit
audio system.
c. To re-test, press TEST button soft-key (2).
d. Refer to the fault isolation procedures in Chapter 4.