5-6
A Guide to TracVision SA
5.4.2 RF Detector
Estimated Time to Repair:
1
⁄
2
hour
The RF Detector PCB (Item 2) receives operating voltages from
both the CPU board and the IRD (via the RF cable)
– Fig. 5-1
.
Ensure that all power is turned off before proceeding.
1. Remove 2 RF connectors from the coaxial fittings
on the PCB. Tag the cables to ensure that they are
returned to the same connectors.
2. Remove the Molex connector from J3
– Fig. 5-5
.
3. Remove 3 pan head screws (Item 33)
– Fig. 5-4
.
Remove the RF Detector PCB from the rotating
plate.
4. Installation of the replacement RF Detector is the
reverse of this procedure. Be sure that the RF
cables are restored to their original positions. Be
sure that the center conductor pin is centered in
the connector before tightening the collar.
5.4.3 Antenna LNB Replacement
Estimated Time to Repair:
1
⁄
2
hour
The LNB (Item 19) receives preamplifier operating power from
the IRD via the RF Detector PCB
– Fig. 5-3
. Be certain that the
IRD is disconnected from its power source before removing or
reconnecting the LNB.
1. Disconnect both RF coaxial connectors at the LNB.
Remove 4 pan head screws and washers (Items 57
and 58)
– Fig. 5-3
.
2. Remove LNB clamp (Item 23)
– Fig. 5-3
.
3. Remove LNB.
4. Replacement is the reverse of this procedure.
Check the rotation to ensure that the LNB is not
striking any wires or the baseplate.
Antenna LNB Normalization and Stability Test
1. Type
HALT<cr>
to put the system into Idle Mode.
2. Type
DEBUGON<cr>
to put the system into
Debug Mode.
When replacing the LNB, make
certain to restore it to its original
orientation, as shown in Figure 5-3.
Familiarity with the PC diagnostic
application is required to carry out
this procedure. Refer to Table 2,
Manual Positioning Commands, in
Appendix F, Maintenance Port
Parser Commands, for further
details.
