PA
1. PA AMP HAS 2 AMP INSIDE:
MAIN (MAX 120W): PRIORITY IS COCKPIT, PA CABIN, PAX ENTERTAINMENT SYS AND BGM
20W: ONLY FOR FLT CREW, LAV SPEAKER (VIA A TRANSFORMER)
2. PA PRODUCES THE CHIMES:
HI: PAX CALL ATT
LO: FASTEN SEAT BELT ON
HI/LO: COCKPIT OR ATT CALL ATT
3. 6DB WILL BOOST WHEN AN ENG RUNS SIG FROM OIL PRESS SW VIA CVR
4. 3DB ADD WHEN CABIN PRESS LOSS
5. A HANDSET IS CONNECTED DIRECTLY TO CAB/SRVC AMP BY PA SW ON O/H
6. PA UNIT IS IN 96VU POWERED BY ESS BUS
7. A POTENTIOMETER IN FRONT SIDE OF 90VU TO SET AMP GAIN ALSO SPEAKERS SENSIVITY CAN ADJUSTED
8. A MASTER GAIN POTENTIO IN FRONT FACE OF PA UNIT FOR MAIN AMP
9. AN EMR PA SW ON O/H PNL CAN CONNECT MIC TO PA DIRECTLY (WITHOUT ANY SEL IN ACP)
10. PA ROTARY SW :
OPERATE
LEVEL VRMS: AMP SWITCHED TO INTERNAL LOAD TO SHOW NOMINAL OUTPUT
TONE: A TEST TONE HEARD FROM SPEAKERS
LOAD: MAIN AMP LOAD MUST BE >30OHM
11. ERB(ELEC RELAY BOX IS INTERFACE OF FWC WITH STATION CALL
12. 6 ERB INSTALLED NEAR THE DOOR ON CEILING
13. THERE’S A MUTING CIRCUIT TO ELIMINATE THE ACOUSTIC FEED BACH BEWEEN MICE AND SPEAKER
14. ALL ACP POWER FROM 303PP OR 306PP VIA AIU(AUDIO INTERCOMM UNIT)
15. ACP IN AVIONIC BAY POWERED DIRECTLY NOT VIA AIU
16. FLT INTEPHONE:
2 JACK IN E&E
ONE JACK ON GND POWER RECEPTACLE
AN AMPLIFIER IN AIU POWERED FROM 306PP
17. CABIN/SRVC INTERPHONE AMP IS IN AIU
18. INT COUPLING SW MAKE FLT INTERPHON AMP PARALELLED WITH CAB/SRVC INT AMP
20. CAB/SRVC INT AMP HAS 2 OUTPUTS:
125W: FOR SERVICE JACK
50W
No comments:
Post a Comment