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Audio International, Inc.
Pin
Description
1
MIC Bias
2
PA MIC Audio HI
3
Weight On Wheels Input (GND)
4
Briefer Audio HI
5
Reserved
6
AES-3 Input +
7
AES-3 Input -
8
AES-3 Shield
9
ID Common
10
Data bus SH
11
+28 VDC Output (Maintenance Port)
12
GND Output
13
Data bus A Output (Maintenance Port)
14
Data bus B Output (Maintenance Port)
15
ID0
16
ID1
17
ID2
18
Reserved
19
Reserved
4.0
Troubleshooting
4.1
Instructions for Continued Airworthiness
No periodic scheduled maintenance or calibration is required for continued
airworthiness of the PA-9075-101-x. If the unit fails to perform to
specifications, it must be removed and serviced by a qualified service
facility.
4.2
General Troubleshooting Procedures
• Verify power to the unit by rechecking +28 VDC power is applied to the
proper pins on the unit. Use a voltmeter to verify correct level.
• Remove power from the unit for at least one (1) minute and reapply
power.
• Recheck all connections to the unit for security. Check all harness
runs for possible pinching.
accuracy.
Document # 540312, Rev IR, 07/2005
J2
(Maintenance Port)
(Maintenance Port)
PA-9075-101-x Installation Manual
Pin
Description
20
PA MIC Audio LO
21
Reserved
22
Briefer Audio LO
23
Reserved
24
PA MIC KEY (Active GND)
25
Briefer KEY (Active GND)
26
PA Audio Output HI
27
PA Audio Output LO
28
PA KEY Output
29
Databus A In
(CMS)
30
Databus B In
(CMS)
31
Chime In (+28V)
32
TT Chime In (+28V)
33
Call In (Active GND)
34
Hook In (Active GND)
35
PA Sidetone Out HI
36
PA Sidetone Out LO
37
Low Tone (Active GND)
Recheck all pinouts for application
Page 11 of 13
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