Sea Tel 9497B-1, Инструкция по установке и эксплуатации

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9497B-1 C/Ku-Band TVRO Maintenance and Troubleshooting
7-17
4. Enter in the 5V OFFSET and the 5V SCALE parameters found in the SETUP menu.
5V OFFSET=CCW value (
recorded in step 2
)
5V SCALE=Center value (
recorded in step 3)
–
5V OFFSET
5. Verify probe drive operation by setting
the POL TYPE parameter to 4 then select
the POL sub menu and cycle through all
four polarization mode dipole positions
by pulsing on the N/S/E/W key. The
dipole should move from the horizontal
alignment position to 45, 90 and 135
degrees clockwise then return to
horizontal.
NOTE:
Should you experience any failures with the above step(s) Continue on to step 6 to
verify proper 5V pulse Servo motor operation otherwise you are done with this procedure.
NOTE: Upon successful completion of the above steps, it may be necessary to Optimize
Polarization which is not within the scope of these instructions. Refer to the Optimizing Auto Polarization
section of this manual.
6. Carefully remove the 5V Polang Pulse
Servo Motor from feed assembly (Do
not unplug wire harness).
7.
Key in a POL value of 0000 and then press
ENTER
8. With a scribe or marker, place an orientation mark on the plastic drive shaft and motor housing as
a “0” reference.
9.
Key in a POL display value of 255 and verify plastic drive shaft rotates 180 degrees.
10. Key in a POL display value of 0.
11. Adjust the Dipole (probe) to a 45 degree
angle (as viewed into scalar plate and re-
attach 5v Polang motor
12.
Repeat Polarity Mode Selection steps 2-5 above
7.4.3.
A REMOTE TILT calibration is required to align the level cage assembly correctly so that all sensors will be
aligned accurately to the axis they relate to. The fluid filled tilt sensor provides a two dimensional horizon
reference. The system is not able to automatically calculate the exact center value, therefore it is necessary
to perform this procedure to manually enter any offset required to make sure the PCU receives a true
reference to the horizon. The procedures below describes the process of performing this calibration from
To Adjust Tilt: