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5-8
A Guide to TracVision R5/R4
Antenna Gyro Calibration
1. Connect a PC to the communications port as
described in
Section 4.4, “Computer Diagnostics.”
2. Type HALT and press Enter while the system is
performing the limit switch initialization routine.
The system will complete the initialization
function by finding the azimuth and elevation
switch limits and then go to the home position.
3. Type
DEBUGON and press Enter to enter Debug
Mode.
4. Type
=CALGYRO and press Enter. Verify that the
Antenna Gyro Azimuth scale factor is between -
0.00090 and -0.00110 and the Antenna Gyro
Elevation scale factor is between 0.00090 and
0.00110.
5. Type
ZAP and press Enter to restart the system.
5.4.4 Antenna LNB Replacement
Estimated Time to Repair:
1
⁄2 hour
In the event that the LNB experiences problems, it may be
necessary to replace it. To do so, use the following procedure:
1.
(European systems only) Make a note of the current
LNB skew angle, pictured in Figure 5-7
.
2.
Disconnect the RF cable connector(s) at the LNB.
3. Remove the wing nut and washer from the LNB
clamp
– Fig. 5-3.
4. Remove the top of the LNB clamp and remove the
LNB.
5. Place the new LNB in the clamp and reattach the
RF connector(s).
6. Replace the LNB clamp:
A. For North American LNBs, tighten the clamp
fully. The replacement process is complete.
B. For European LNBs, do not fully tighten the
clamp and proceed to Step 7.
7.
(European systems only) Carefully turn the LNB so
that the scribe mark is aligned with the skew angle
noted in Step 1. Fully tighten the clamp to
complete the replacement process.
The LNB receives power from the
reciever via the RF Detector PCB.
Be certain that the receiver is
disconnected from its power source
before removing or reconnecting
the LNB.
Skew Angles
LNB Clamp
& Wing Nut
Scribe
Mark
LNB
Figure 5-7
LNB Skew Angle Setting
(European Systems Only)