SYSTEM DESCRIPTION AND INSTALLATION MANUAL
HS--700 High Speed Data System
23--20--33
30 Aug 2002
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Page 1--15
Table 1-7. DO--160D Environmental Categories
(cont)
Description
Category
Icing
X
Electrostatic Discharge (ESD)
A
(4) Table 1-8 gives a description of the HSU front panel lights and button.
Table 1-8. HSU Front Panel Description
LED/Button
Description
FAIL LED
The red FAIL LED continually illuminates when a failure has been detected
in the HSU which can degrade the system operation.
SELF TEST LED
The green SELF TEST LED continually flashes during POST and PAST to
indicate that the self test is operating. The LED is extinguished when all
self tests have been completed.
RESET Button
The HSU has a RESET button on the front panel for BITE purposes. If the
RESET button is pushed, the HSU first asks the SDU for permission to
perform the reset procedure. The RESET button can be activated at any
time. During the RF loop back part of the test procedure, the HPA and
DLNA are switched off by the SDU.
B. CDM
(1) The CDM is housed in a small box which fits into the slot on the rear panel of the
HSU. Figure 1-3 shows the CDM. The leading particulars for the CDM are given in
Table 1-9.
NOTE:
When extracting the LRU from the aircraft’s mounting tray for maintenance,
detach the CDM from the rear of the removed LRU and install the CDM on
the replacement LRU.
Figure 1-3. CDM
