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Sea Tel ST144 Manual Download Page 9

Field Service Procedure – Replacement PCU Kit, ST88, ST94 & ST144  

Page

 

8

 

of

 

22

 

 

Document No 

137738 Rev A

 

Copyright © Sea Tel, Inc 2012 - The information contained in this document is proprietary to Sea 
Tel, Inc.  This document may not be reproduced or distributed in any form without prior written 

consent of Sea Tel, Inc.  

 

 

 

Below

 

Decks

 

Modem

 

Assembly

 

Above

 

Decks

 

Modem

 

(Located

 

in

 

the

 

PCU

 

Assembly)

 

 

LED

 

Illuminated

 

Green

 

 

 

LED

 

Illuminated

 

Red

 

 

 

 

 

15.

 

400MHz

 

Modem

 

Queries:

   

The

 

400MHz

 

modem

 

assemblies

 

facilitate

 

the

 

use

 

of

 

line

‐

based

 

commands

 

via

 

the

 

ACU’s

 

front

 

panel,

 

the

 

internal

 

HTML

 

page,

 

or

 

using

 

remote

 

diagnostic

 

software

 

such

 

as

 

DacRemP

 

and

 

ProgTerm.

 

The

 

use

 

of

 

these

 

commands

 

will

 

aid

 

in

 

troubleshooting

 

communication

 

failures

 

between

 

the

 

above

 

decks

 

and

 

below

 

decks

 

modems.

 

Listed

 

below

 

are

 

the

 

available

 

commands:

   

 

 

 

 

Summary of Contents for ST144

Page 1: ......

Page 2: ...ts the motor gains for the size of the antenna as well as configuring the dishscan pattern The MK2 XX09 PCU Motherboard PCB features an integrated Pol Aux relay PCB as well as status LEDs for diagnostic purposes a Mini USB port for software uploads and service serial port for Bluetooth connection The motion platform PCB houses 5 sensors Two solid state MEM sensors which are used as the antennas ho...

Page 3: ... any of the initialization steps or a pedestal error requires further troubleshooting 5 Power SupplyTroubleshooting Caution Electrical Hazard Dangerous AC voltages exist on the power supply Observe proper safety precautions when working on the power supply 1 Remove the cover from the PCU to allow access to the power supply for testing 2 Measure the input voltage into the power supply on the 2 pins...

Page 4: ...ng Red Communication error with the motor driver enclosure Check the MDE status LEDs If MDE is good check to assure that the harness connections are seated properly Check harness connections pin pin wire wire and wire ground for good continuity Replace main PCB Replace MDE 7 Pedestal Error Error 8 7 1 Decoding a Pedestal Error Error 8 When the DAC displays a pedestal error enter into the remote co...

Page 5: ...fy the N0 and motor gain parameters N1 CL N2 EL and N3 AZ are correctly configured in the PCU through the Remote Command window of the DAC 2 Verify the balance of the antenna and check for physical restrictions on the pedestal If the axis isn t correctly balanced the PCU will be outputting additional drive commands to maintain the antennas level position 3 If the motor isn t driving correctly or n...

Page 6: ...SP_V screen of DacRemP The software will now plot the level position of the LV and CL MEM sensors Observe for any abnormalities 2 Verify Cross Level response Standing behind the system push the cross level beam down to the left and hold it in position Verify that the CL trace on DacRemP moves down an equal amount to the movement exerted on the axis Release the axis and verify the DacRemP trace and...

Page 7: ...have issues targeting in azimuth such as not accurately finding the satellite or repeatedly finding the satellite in different azimuth positions then it s important to diagnose if the system is mispointing in azimuth or relative Relative feedback from the AZ encoder can be verified by initializing the system verifying it calibrates itself correctly and then driving the pedestal clockwise in 90 deg...

Page 8: ...ther Diagnostics If any of the above checks have indicated a problem one or more of the axis control loops have incorrect loop errors The most likely cause of this is a defective rate sensor To rectify this replace the motion platform PCB and repeat the checks above to verify the antenna now functions correctly Should the problem persist there are other possibilities that can produce the same resu...

Page 9: ...ea Tel Inc Below Decks Modem Assembly Above Decks Modem Located in the PCU Assembly LED Illuminated Green LED Illuminated Red 15 400MHz Modem Queries The 400MHz modem assemblies facilitate the use of line based commands via the ACU s front panel the internal HTML page or using remote diagnostic software such as DacRemP and ProgTerm The use of these commands will aid in troubleshooting communicatio...

Page 10: ...rol Unit front panel or connection requirements for using remote diagnostic software and or the internal HTML page of the ACU Refer to the appropriate manual text if further instruction on wiring connections or button pushing is required 16 1 Using the ACU Front Panel 1 Using the ACU s front panel navigate through the setup menu to access the remote command sub menu 2 Enter in the desired modem qu...

Page 11: ...omm diagnostics Tool cntrl c 7 In the Remote Command Entry Window type in the desired modem query and hit enter I e 1234 CR 8 Observe and or record the displayed response 9 Repeat as required until all desired modem queries are noted 16 4 Using ProgTerm 10 Open up ProgTerm and select the tools menu 11 Select modem tools 12 Select the desired modem location BDE is the Below Decks Modem ADE is the A...

Page 12: ...e list below to determine which modem fault s if any are present 3 Use the appropriate text following the failure table for a list of possible failures attributed to the failure type established 17 2 Tools Suggested Laptop or PC w an available comport and diagnostic software installed ProgTerm Ver 1 35 or Later DacRemP Ver 0 20 or Later 9 pin Serial cable Straight thru 1 1 Pin out For Serial Based...

Page 13: ...Panel to radome Connector Bracket 3 Rx N to SMA Adapter Located on connector bracket at radome base 4 SMA to SMA From connector bracket to bottom the bottom side of the rotary joint 5 SMA to SMA From top side rotary joint to PCU ADE Modem 3 Rotary Joint Receive channel Verify continuity on the receive channel for its entire 360 degree range of motion Replace rotary joint if any sector of it has fa...

Page 14: ...acket Base Rack Panel Assembly 2 CFE BDE to ADE Rx LMR 400 3 Rx N to SMA Adapter Connector bracket at radome base 4 SMA to SMA connector bracket to bottom side rotary joint 5 SMA to SMA top side rotary joint to PCU ADE Modem 3 Rotary Joint Receive channel Verify continuity on the receive channel for its entire 360 degree range of motion Replace rotary joint if any sector of it has failed 18 6 BDE ...

Page 15: ...dem Tx Port Failure Not transmitting at 460 0MHz Install Spectrum Analyzer in line with the Rx IF coax path 1 If 465 0MHz Transmit Beacon in present the fault is the BDE modem 2 If 465 0MHz Transmit Beacon is NOT present the fault is with the ADE modem 18 9 BDE Transmit Or ADE Receive Radio MandC 1 BDE Modem Tx Port Failure Not transmitting at 447 5MHz or 2 ADE Modem Rx Port Failure Not receiving ...

Page 16: ...her the above or below decks based on the jumper setting s of the below table Verify the configuration of the defective modem installed on your antenna for the correct configuration Standard configurations for the XX09 XX10 XX11 and 9797B VSAT systems use RS232 protocol so are configured to 1 in the above decks and 2 in the below decks The ST88 ST94 and ST144 TVRO antennas with MK2 electronics use...

Page 17: ...ut the motor isn t driving the motor is defective and needs replacing If no voltage is present verify the connections of the reflector harness by measuring pin to pin as per the below diagram If the harness connections are good then the PCU motherboard isn t outputting the voltage to drive the motor and needs replacing As long as the pol range is within the pot limits the DAC will issue the pol dr...

Page 18: ...le Ties Tie Wraps Loctite 242 21 2 Procedure Procedure for replacing the PCU assembly Sea Tel kit part number 137737 PCU part number part number 131057 3 Caution Power down the pedestal before following this procedure 1 Using a 1 Phillips screwdriver remove the screw securing the coax switch connection of the reflector harness from the termination block 2 Remove the coax switch IDC connector from ...

Page 19: ... Inc 5 Now disconnect the two RG 179 coax cables from the in output side of the coax switches using a 7 16 wrench 6 Now disconnect the four RG 60 coax cables from the input side of the coax switches using a 7 16 wrench noting their orientation 7 Using a 5 16 wrench disconnect the two SMA cables from the 400MHz modem PCB 8 Disconnect the GPS antennas RJ 45 connector from the PCU 9 Using a pair of s...

Page 20: ...curing the reflector and motor driver D sub connectors to the PCU and disconnect them 12 Check all cabling from the PCU assembly and coax switch has been disconnected from the pedestal and remove the PCU and coax switch assembly using a 3 16 Allen wrench Save the hardware for future use Note Secure the weight of the assembly while removing the mounting hardware 13 With the defective PCU removed fr...

Page 21: ... split washer and that Loctite 242 is applied to the threads Ensure the ground point is connected to the lower left hand mounting point 16 Reconnect the red and green RG 179 coax cables to the lower mounting bracket 17 Reconnect the white and blue RG 179 coax cables to the coax switches as per the labels on the mounting plate 18 Reconnect the D sub connectors using a 2mm flat blade screwdriver 19 ...

Page 22: ...witch to the modem using a cable tie 23 Connect the AC input connection and secure the connection to the assembly using a cable tie 24 Secure the red and green RG 60 coax cables to the red and green RG 179 coax cables using a 7 16 wrench 25 Reconnect the four RG 60 coax cables to the coax switches matching the colors to the labels on the mounting plate 26 Reconnect the IDC connector to the termina...

Page 23: ...7 for the size of the pedestals reflector s Without the N0 parameter configured in the PCU the antenna won t initialize as none of the motor gains will be set the status window of the DAC will display the model number of the antenna as xx09 opposed to ST88 ST94 or ST144 etc Enter into the remote command screen and input the correct N0 parameter for the model of antenna as per the below table I e t...

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