Servo Motor, HELP

Discussion in 'C-BAND Satellite Discussion' started by ECruzBUD, Apr 16, 2018 at 4:02 AM.

  1. ECruzBUD

    ECruzBUD Topic Starter SatelliteGuys Guru

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    Hi,

    Some of you may already know ME here in Seatac, Washington.
    And I have a 10 foot mesh dish antenna, which I also have
    a GI 650i analog C/Ku band receiver that moves the dish and
    controls the servo motor.

    I've been having a problem with a servo motor on my
    Co-Rotor II feehorn.

    My 26 years old nephew had replaced it for me on
    January 20th. It worked for a while with the NEW
    blue servo motor I bought on ebay.

    Lost Vertical channels with it.

    Then I have a friend, a Samoan guy from Samoa, to help,
    but I think he made it worse on the servo motor.
    Because he has never have any experience with
    the satellite C-band dish. But he's 6 ft 4 inches tall guy.

    I think that he made it worse by turning the
    couplet disc on the servo motor by hands, for a few times
    before he insert it back onto the feedhorn.

    When I try changing the channel for the TEST,
    all he heard this sound ZZZZZZZZZ

    He said when I change d only work once, than
    it stops. And does not go any further beyond.
    The probe on the feehorn only runs once and
    stop and doesn't go any more.when changing
    the channels.

    The Samoan guy wants to do test the servo motor
    by bringing it in to hook up onto my satellite receiver,
    to see whether if it the servo motor or something else.
    Again, he has no experience with satellite system.

    The reason I asked him to, is because I cannot go up
    any higher on the ladder, myself.

    So, ALL I want to know, is it true that the servo motor
    is NOW NOT working, is it because he was turning the
    couplet disc back and forth by hands before putting it back onto
    the feehorn??? I heard him turning it. And I do not
    know is that the right thing to do???

    In my spare time, I checked it out with the old servo motor
    with the couplet disc on, and tried what he did by hand.
    I noticed when turning the couplet disc, when it reach to it's end,
    it locks up.
    Maybe that's why the servo motor isn't working, right???
    Because he did that????

    He stripped the wires from the servo motor and the ones from
    my satellite receiver that runs outside to the feedhorn, and
    he was testing it by twisted them together, and it only worked
    a very short while, as I described at the above.

    Then he inserted the stripped wires into the plastic connectors,
    and clamp them, and test it when I change the channels, same
    problem. The probe on the feehorn doesn't rotate and it sounds
    like ZZZZZZZZZ

    So, what should I do when he brings in the servo motor
    on Tuesday night?? Or on Wednesday morning???
    Should I take off the couplet disc and put it back on
    the servo motor, and DO NOT TURN the disc vby hands,
    and just TEST it to see IF it movies when change the channels?????

    I'm referring a blue servo motor with
    RED, WHITE and BLACK wires.

    What do you think???

    Hope that you understand it all about the problem with
    the servo motor. The blue one with 3 whites and with
    a blue couplet disc.

    Thanks,
    Eugene
     
  2. Titanium

    Titanium AI6US
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    Never attempt to manually rotate the probe or the servo motor shaft. This could damage the servo or break the shaft coupler. A servo motor only rotates approximately 180 degrees on each side of default center then stops against a mechnical end-stopper.

    With the servo motor removed from the feedhorn, gently rotate the probe to verify that it smoothly and easily rotates 360 degrees inside the feedhorn. If the probe does not easily rotate, it may need cleaning or is damaged. A sticking probe may not rotate or lead to servo failure.

    A zzzz sound without the probe rotating might indicate to me that the probe may be stuck, the coupler wasn't properly aligned during assembly, the servo motor was installed incorrectly, the probe wasn't centered before attaching the servo, etc. It could even indicate that the servo motor is now damaged and the gears are stripped.

    Been following your threads on this and another forum. It appears that the servo was purchased because the the system was having problems with receiving channels on one polarity. Since the new servo was installed, the system still has problems with receiving the other polarity. Maybe the problem wasn't with the servo? Maybe the new servo was installed 180 degrees out or rotation?

    Check the legacy receiver polarity skew settings for each polarity using the satellite that is selected to change polarity. Are the two skew settings offset by from each other by 90 degrees? If not, this is the problem, as horizontal and vertical polarities will be approximately 90 degrees rotational difference.

    Remove the servo motor from the feed so you can observe the motor shaft, but leave all wires attached. Watch to see if the servo motor shaft rotates 90 degrees when switching from horizontal to vertical (channel 1 to channel 2 on the legacy receiver). If so, the servo is working properly. If the shaft rotates too far and hits the rotation mechanical end-stop, the skew setting is not adjusted correctly or there is another problem. Hitting the end of the rotation repeatedly will damage the servo.

    Watch the shaft rotate as the legacy receiver's skew setting is slowly changed through the range of -90 to +90. Does the servo motor shaft rotate? If it rotates, does it rotate to angles corresponding to the legacy receiver's skew angle setting? If not, bring inside and connect directly to the legacy receiver servo terminals and repeat the above testing.
     
    #2 Titanium, Apr 16, 2018 at 10:34 AM
    Last edited: Apr 16, 2018 at 10:50 AM
  3. ECruzBUD

    ECruzBUD Topic Starter SatelliteGuys Guru

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    Hi Titanium,

    Than you sooooooooo much about what would happen when my friend, a
    Samoan guy turned the couplet disc on the servo motor.
    What does he knows????

    YES, this week on either Tuesday night or Wednesday morning,
    He want to bring that NEW servo motor in connect to my
    GI 650i analog C/Ku band receiver, to TEST it.

    What do we expect to see???? And what to expect that isn't something
    that we do NOT expect to see happen???? Like what IF it NOT working???
    Should he think it's the feehorn????

    He did looked at the servo motor by removed from the feehorn, and
    I changed the channel for him to watch the couplet disc rotate.
    He told me ti only rotate half shaft once after the first channel, and it stopped
    when when I was continuing changing the channels. Forward and backward

    So, can you tell us what to expect on the servo motor with the receiver???
    What IF this, what to know????
    What IF that, what to know?????

    I do NOT want him to make a assumption on what may caused the problem.
    In other words, I do not want him to make decision for ME. Should ask ME, first.

    Thanks,
    Eugene
     
  4. Titanium

    Titanium AI6US
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    I have already indicated in the last post how to test the feedhorn probe, how to test the servo motor, how to test the receiver and what to expect.

    You also received good advice from an old post in this forum and in the past months on the other forum. I have nothing more to add to the information that has been already been provided.

    If you or your assistant do not understand the testing steps, I would highly recommend hiring a commercial installer. I see one was already suggested from across the sound in Gig Harbor, there likely are many, many more capable commercial satellite technicians in the greater Seattle area.

    Good luck!
     
    Babadem likes this.
  5. Arion

    Arion SatelliteGuys Pro

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    Why not just ditch the servo and get a cheap and simple voltage switching LNB and be done with it. Not worth the hassle if you can't figure it out IMO.
     
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  6. wildcat374

    wildcat374 Well-Known SatelliteGuys Member

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    this guy ECruz is messing with your head read around on outher sites you will see...
     
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  7. Comptech

    Comptech SatelliteGuys Pro
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    Yep, don't waste your time. He has been given plenty of advise and will not accept it. Very rude about the guy that helps him. I call troll.
     
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  8. Babadem

    Babadem SatelliteGuys Pro

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    I don't subscribe to MOB mentality, but ECruz's case is out of this world!:deadhorse:facepalm
     
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  9. Horsepower

    Horsepower SatelliteGuys Pro
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  10. wildcat374

    wildcat374 Well-Known SatelliteGuys Member

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  11. Titanium

    Titanium AI6US
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    One of the reasons that I enjoy SatelliteGuys is because we are typically helpful and friendly. In this case, I know that Eugene has been provided with a plethora of solid advice and needs to simply read, reread and read again the hundred plus posts that have been written by dozens of hobbyists who have clearly articulated testing steps and alternative solutions to resolve his reception problems.

    I am certain that we all want him to succeed and once again be able to watch all available channels, but unfortunately, in this case it seems that there are physical limitations, and I suspect communications are complicated by English as a second language.

    Eugene, I am willing to assist if you have a SPECIFIC simple question.
     
    Horsepower, mc6809e, KE4EST and 2 others like this.
  12. ECruzBUD

    ECruzBUD Topic Starter SatelliteGuys Guru

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    Hi Folks and Titanium, : - )))

    The question for now is..

    What to expect to see the servo motor react when testing directly with
    the analog GI 650i C/Ku band receiver???? Which controls both the
    actuator arm and the servo motor.

    IF we hears the servo motor works, and IF the couplet disc is STUCK
    from rotating, what would this mean????

    Further details...

    My friend who's a HUGE, BIG 6 ft 4 inches tall Samoan guy from
    Samoa, wants to help. His name is "Pouli".

    He have helped the Mormon church people for building houses
    for them, and done electrical wiring for their houses.
    But NEVER before on a satellite system. He thought it's easy,
    compare with helping with the Mormons.

    He told me that he doesn't have times to watch TV, and
    he told me he doesn't know anything about satellite system,
    but only understand the wiring works.

    Last Wednesday he was up on the ladder with my walky-talky
    to communicate me, and he wanted to TEST the servo motor
    without the feedhorn, just to see what what does it looks like
    on the servo motor itself when I do change the channels.

    So, I did changed the channel while the servo motor is off the
    feehorn for the TEST.

    Pouli said from what he saw....

    "Only go forward one time about a quarter rotation, and then stops.
    Then it would not move anymore to forward or backward channels."

    While doing this, he also heard the ZZZZZZZZZZ sound from the
    servo motor. NOT from the feehorn.

    That was Wednesday April 11th.

    So, now Pouli wants to bring in that NEW servo motor
    to test it directly from the GI 650i receiver, either tonight
    or tomorrow morning, before he goes to work at the airport
    nearby for Horizon Airlines.

    He wants to see IF the same interpretation with the receiver,
    to determine what may caused.

    So, I'm asking you, what to expect to see from the servo motor
    write with the receiver???

    IF it working with a ZZZZZZZ sound, and the couplet disc isn't
    or rotate only half way, or STUCK trying to rotate, what this mean????

    Pouli is trying to determin whether if it the feehorn or my receiver.

    Como on, my receiver is working, I bought the dish down so that
    we can work on it. : - )))

    What do you want me to know when I see the TEST outcome with
    the receiver?????

    One thing I do notice about Pouli. Last week, when he was going to
    put the srvo motor back onto the feehorn, I notice I heard a rrrrrrrr
    sound, or whatever you describe, when he was TURNING THE
    COUPLET DISC AROUND BY HANDS A FEW TIMES. Hmmmmmm.

    I got an e-mail from Patrick, from A.S.T.I. in Gig Harbor.
    He said that he's NOT able to troubleshoot Satcom issues.
    He said that they're commercial integrator. : - ((((

    So, as for you, my question is how should we know that the servo motor
    is working with the receiver???? Would it mean it would work on the feehdhorn????

    Hope all helps with answers.

    Thank you,
    Eugene

     
  13. Horsepower

    Horsepower SatelliteGuys Pro
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    Eugene, if I could try to be helpful for a minute: It matters not, and people don't care about your friend's size, national origin, his religion, his occupation, his employer, his name, or how much time he has to watch TV. When you insert these meaningless details into an already confusing discussion it makes it quite difficult for people to help you. Concentrate on the problem and the problem only.

    Hope this helps.
     
  14. Titanium

    Titanium AI6US
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    Check the legacy receiver polarity skew settings for each polarity using the satellite that is selected to change polarity. Are the two skew settings offset by from each other by 90 degrees? If not, this is the problem, as horizontal and vertical polarities will be approximately 90 degrees rotational difference. Example: if Horizontal skew is set to -45, set vertical to +45. This is very important for the rest of the testing!

    Connect the servo motor directly to the GI650 and observe the motor shaft. Watch to see if the servo motor shaft rotates 90 degrees when switching from horizontal to vertical (channel 1 to channel 2). If so, the servo is working properly. If the shaft rotates too far and hits the rotation mechanical end-stop, the skew setting is not adjusted correctly or there is another problem. Hitting the end of the rotation repeatedly will damage the servo.

    If the shaft does not rotate back and forth 90 degrees when the polarity is changed, either the servo is damaged or the GI650 is failing. Try another servo to confirm if it works or not.

    Watch the shaft rotate as the legacy receiver's skew setting is slowly changed through the range of -90 to +90. Does the servo motor shaft rotate? If it rotates, does it rotate to angles corresponding to the legacy receiver's skew angle setting? If the shaft does not rotate, either the servo has failed or the GI650 is failing. Try another servo to verify if failed servo motor or failed GI650.
     
  15. ECruzBUD

    ECruzBUD Topic Starter SatelliteGuys Guru

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    Hi,

    As for the test with the servo motor....

    On the feehorn, the SKEW works on the GI 650i C/Ku band analog receiver.
    But it won't change the channel.
    I can see the channel numbers up and down on TV, but don't hear
    the probe.

    When testing the servo motor with the GI 660i receiver, ALONE, INSIDE.
    The SKEW works....
    But again, won't change channel.
    This is with the receiver, directly with the servo motor.

    I don't see anything in the menu that would prevent from
    changing the channel.

    The connections are fine on the back of the GI 650i receiver.
    See picture. Look for RED, WHITE and BLACK on the
    bottom terminal. +5V.

    My friend who helped me thinks it's the receiver terminal that
    isn't changing the channel. But SKEW works.

    Eugene
     

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