Honeywell
COMPONENT MAINTENANCE MANUAL
PART NUMBER 964-0452
I.B.1516A
Mar 30/01
23-12-01
(4) LED Board, A5
The LED Board, A5, contains the 3 LED indicators, which indicate:
• LRU Fail
• Coupler Fail
• Control Fail
The LED Board is connected to the Motherboard via a ribbon cable and connector, and
also contains the switch for manual test initiation (X14).
(5) Motherboard, A6
Motherboard, A6, consists of an 8-layer board, containing all signal links and power sup-
ply lines to the individual modules. The modules are contacted via indirect plug-in con-
nections. A coaxial cable provides the RF link between the Receiver/Exciter, A1, and the
Power Amplifier, A3. All signals present at the ARINC 600 rear connector are supplied to
the EMC Filter, A7, via 2 ribbon cables (plug-in connection W74, W76).
(6) EMC Filter, A7
The EMC Filter consists of a rear panel and the Filter board, which connects the external
cabling with the basic modules of the Transceiver.
The Filter board prevents the transmission of spurious signals in both directions by
means of RCR and LCR low pass filters. All lines to the ARINC 600 rear connector are
provided with overvoltage limitation. Lines that do not require filtering are decoupled with
resistors to prevent operational disturbances.
In addition, the Filter board contains an LF board as a subassembly for matching adjust-
able symmetrical LF inputs and outputs to the 0dBm interface of the Transceiver.
(7) Controller D, A8, and Interface D, A9
The control functions of the Transceiver are performed by the Controller D and Interface
D modules. The 2 modules are interconnected by means of the Motherboard, A6.
(a)
Controller D, A8
Controller D, A8, accommodates the processor, the memories, the module bus for
driving the RF assemblies, as well as the serial interfaces for communication with
the FK 516 Antenna Coupler and test interface.
(b)
Controller D, A8, Performance Characteristics
• Processor 80C186 with 16MHz clock frequency
• 64 kByte RAM
• 128 kByte EPROM
• 8 kByte EEPROM
• Serial interface to antenna coupler
• Serial test interface
• A/D converter for squelch and sense
• 16 bit module bus for controlling the RF assemblies
• x2 ARINC 429 inputs, 1 ARINC 429 output, with transfer rate of 12.5kBps
• Discrete inputs/outputs
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