COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
FA2100CVR
Page 35
Nov. 01/98
Description and Operation
23–70–04
Table 5. Aircraft Interface PWA to Acquisition Processor PWA Interface Signals
Signal Name Description
39VDC 36.6 $2 volt dc output provides up to 16 watts, maximum, to the
main power supply. Up to an additional 4 watts can be supplied to
external test equipment with nominal input voltages and room tem-
perature.
39VDC RTN Return path for 39 Vdc current. Tied to ground on both PWAs.
+5VDC +5 volt input from main power supply. Required tolerance is $5%.
Current required is less than 40 ma.
+12VDC +12 volt input from main power supply. Required tolerance is $10%.
Current required is not more than 35 ma.
−12VDC –12 volt input from main power supply. Required tolerance is $10%.
Current required is not more than 25 ma.
PREAMP PWR
(+18VDC)
+18 volt input from the main power supply, current limited on Acquisi-
tion Processor. Required tolerance is $2 volts.
Current requirement is less than 25 ma.
+15VDC +15 volt output made from Storage Supply input voltage. Tracks the
unregulated input below about 15 volts and then regulates at that lev-
el. +18VDC of the main supply is diode coupled to this signal and
provides the power after the main supply is running. Maximum cur-
rent required by Aircraft Interface is 20 ma. The Aircraft Interface can
supply 100 ma to the Acquisition Processor until the main supply
starts running.
+ 5VDC (S) +5 $0.1 volt output made by Storage Supply to provide power to the
main power supply control circuits. The external current must be less
than 10 ma.
Data Link & OMS*
* Used with
2100− 1025/1026/
1027−XX only
Inputs (A, B) − Conditioned, differential Data Link/OMS input to AP
PWA [only used with 205E2502−10/11 AP boards. (MOD−DOT 5
Units.)]
Outputs (A, B) − Data Link/OMS output signal for Acquisition Proces-
sor, which drives the ARINC−429 output buffer.
C. Audio Compressor (AC) PWA
The Audio Compressor (AC) provides a data interface between the Aircraft Interface
(AI) and the Acquisition Processor (AP). The AC digitizes, compresses, and pack-
ages four audio channels for subsequent processing by the AP. The AC provides in-
terfaces between the AI and the AP for Greenwich Mean Time (GMT) Data, Rotor
Speed (RSE) Data, and Discrete Data.
May 21/1
Rev. 11 Page 35
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