Northern Airborne Technology 251 - Manual (Page 16)

Model 251 Passenger Speaker Amplifier
SM251 Installation and Operation Manual
Section 2 Rev: 1.00 Issue 2 Page 2-8
ENG-FORM: 805-0120.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4.8 Pin Assignment
P40 (25-pin connector):
Pin Function Pin Function
1 Left Spkr Out HI 14 Left Spkr Out HI
2 Left Spkr Out HI 15 No connection
3 Left Spkr Out LO 16 No connection
4 Left Spkr Out LO 17 Power Ground
5 Left Spkr Out LO 18 Power Ground
6 28 VDC 19 Power Ground
7 28 VDC 20 Power Ground
8 28 VDC 21 28 VDC
9 Right Spkr Out LO 22 Chassis Ground
10 Right Spkr Out LO 23 No connection
11 Right Spkr Out LO 24 No connection
12 Right Spkr Out HI 25 Right Spkr Out HI
13 Right Spkr Out HI
P50 (37-pin connector):
Pin Function Pin Function
1 Audio Common (except stereo) 20 Audio Common (except stereo)
2 PA MIC HI 21 Audio Common(except stereo)
3 Paging Volume 22 Audio Common(except stereo)
4 Briefer Audio HI 23 No connection
5 Stereo Switch 24 PA Key
6 Left Input HI 25 Briefer Switch
7 Left Input LO 26 No connection
8 Right Input LO 27 Audio Common(except stereo)
9 Right Input HI 28 Audio Common(except stereo)
10 No Connection 29 Audio Common(except stereo)
11 Receiver Volume Control 30 No connection
12 No connection 31 Smoking Sign Switch
13 TV Switch 32 Seat Belt Sign Switch
14 PSC Switch 33 Cabin Call Switch
15 ADF2 Switch 34 Hook Switch
16 ADF1 Switch 35 PA Sidetone HI
17 ADF1 Audio HI 36 Audio Common(except stereo)
18 TV Audio HI 37 ADF2 Audio HI
19 PSC Audio HI
P60 (9-pin connector):
Pin Function Pin Function
1 Right Monitor Output HI 6 No Connection
2 Right Monitor Output LO 7 No Connection
3 Speaker Mute 8 Speaker Enable
4 Left Monitor Output LO 9 No Connection
5 Left Monitor Output HI