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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
SECTION 6 - MAINTENANCE 6-23
6:69. Power Distribution card.
1. Press slide lock button on right hand side of chassis and push the slide toward the rear of the
chassis until the inner part of the slide is disengaged.
2. Locate Power Distribution card. (see Figure 6-20).
3. Disconnect all cable connections.
4. Remove 15 #4-40 mounting screws from side panel of Main Chassis.
5. Remove suspect Power Distribution card.
6. Remove and replace preformed thermal gasket between heat sink surfaces of replacement card
and right side panel..
7. Repeat steps (1 - 5) in reverse order to replace Power Distribution card.
6:70. Tracker, Digital Receiver, Pre-processor, Digital Transmitter, and BIT cards.
1. Locate the card cage in the DPS Main Chassis (see Figure 6-20).
2. Locate the LRM to be replaced (see silkscreen on edge of card cage).
3. Remove any interconnect cables at top edge of board assembly to be replaced.
4. Remove suspect LRM.
5. Replace LRM and re-attach cables.
6:71. Antenna Switch.
1. Release chassis slide locks and slide Main Chassis out far enough to gain access to the rear of
the Main Chassis.
2. Locate Antenna Switch LRM.
3. Remove 4 cables at rear of chassis marked ANT1- ANT4.
4. Remove J1, CAL IN and RF OUT connections from Antenna Switch.
5. Remove 4 #6-32 screws at rear of chassis.
6. Repeat steps 6.4.1 - 6.4.5 in reverse order to replace Antenna Switch assembly.
6:72. Data Computer PCE-4129
1. Locate the Data Computer is the DPS Chassis (see Figure 6-20)
2. Release chassis slide locks and slide Main Chassis out far enough to gain access to the rear of
the Main Chassis.
3. Refer to Figure 6-21, Figure 6-22, and Figure 6-23 making a note of all connections.
4. Unscrew the Data Computer’s VGA connector from the rear of the computer and disconnect it
from the computer.
5. Disconnect the RJ-45 connector from the LAN 1 connector.
6. Remove cables connected to SATA0, SATA1, Front Panel USB45, and the GPS ribbon cable
connected to the RS485 daughter board.
7. Remove the #6-32 screw holding the Data Computer in place via its mounting bracket.
8. Remove the computer from its backplane.
9. Repeat steps above in reverse order to replace the Data Computer.
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