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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
6-28 SECTION 6 - MAINTENANCE
6:82. Digisonde operations require a fully functional Data platform. It is unusual that the Data Computer
boots successfully but is then unable to start necessary LDI software DCART and Dispatcher. For that reason, it
is overwhelmingly the case if DCART and Dispatcher software programs run that the Data Computer is func-
tioning normally.
6:83. Most commonly when the Data Computer fails to work properly it fails to boot. This could be caused
by a failed hard drive, memory, or CPU failure due to a fan failure. Should these failures occur, the Data Com-
puter should be replaced with its spare.
6:84. One should first ensure that the Data Computer itself is functional. If it is, it should emit a beep or se-
ries of beeps indicating that its Power On Self Test (POST) has completed successfully. If this audio event does
not occur and no video output can be observed on the connected monitor, then one must suspect a computer
hardware failure.
6:85. In the event the Data Computer does not POST one can attempt to replace the PCE-4129 Data Comput-
er Board.
6:86. If the Data Computer does POST and it appears the single board computer hardware is functioning
properly, the next step is to ensure the boot device is working properly. It is recommended to replace the Solid
State Disk (SSD) drive with a spare or attempt to connect the SSD directly to the Data Computer instead of hav-
ing the SSD connected through its caddy and tray. Should you not spare SSDs at the site, ensure you bring a
fully configured drive with you if hard drive failure is suspected.
TROUBLESHOOTING CONTROL COMPUTER
6:87. The message “DESC connected since …….” at the top of DCART window confirms the Control com-
puter is operating and is connecting by the internal LAN connection. Additionally, current DESC status dis-
played in the lower left hand corner of the DCART window is an indication of Control computer connectivity as
without a network connection DCART will report a DESC status of “connecting”.
6:88. A monitor can be connected to the VGA connector of the Control computer on the rear of the computer
card. Messages seen on the screen during boot up may clarify where the system is hanging on an unsuccessful
boot-up. The Control computer makes no use of a mouse or keyboard after POST. It may be necessary to Re-
start the Control Computer after connecting a monitor. This may be accomplished by moving the slide switch at
the top of the Power Distribution card forward briefly and then back to cycle the power or by pressing the red
reset button on the front of the chassis.
6:89. Common difficulties with the Control computer are related to a failure of communication between Data
and Control computers. One should monitor the boot progress of the Control computer after connecting a moni-
tor as described above ensuring the DHCP and TFTP processes running on the Data computer are working as
expected. Also ensure the network cable is physically connected to the correct network port on the rear of the
computer. The dedicated network lane for communication between the Data and Control computers should be
connected to the lower of the two network ports on the HS-872P Control computer.
6:90. Power for Control Computer as well as the Card Cage with LDI manufactured cards is controlled with a
slide switch (SW12) at top of Power Distribution card. This switch, SW12, should be used to remove power
from the Card Cage while removing and reinstalling cards in the Card Cage. Toggling the switch can also be
used to Restart the Control Computer.
6:91. Pressing reset button on the front of the Main Chassis should result in a Control Computer POST beep
if the computer is functioning.
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