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SYSTEM DESCRIPTION AND INSTALLATION MANUAL
Table 1-7. DO- -160D Environmental Categories (cont)
Description
Icing
Electrostatic Discharge (ESD)
(4) Table 1-8 gives a description of the HSU front panel lights and button.
LED/Button
FAIL LED
SELF TEST LED
RESET Button
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.
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
HS--700 High Speed Data System
Table 1-8. HSU Front Panel Description
The red FAIL LED continually illuminates when a failure has been detected
in the HSU which can degrade the system operation.
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.
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.
Figure 1-3. CDM
23- -20- -33
Category
X
A
Description
Page 1--15
30 Aug 2002
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