Advice Needed Fibo motor problem.

J

Julesd

New Member
Messages
8
My Satellite Setup
VU+ Duo, SAB Unix
My Location
Liverpool UK
Season's greetings to everyone.
I have a fibo motor fitted to a Gregorian 1.2m dish.
Recently the motor stopped working properly, luckily I had another one
which I replaced it with.
Problem is, it will only move for about half a second each time I try and move east or west.
I have opened it up and soldered the joints on the 2 circuit boards hoping it was dry joints,
but still doing the same. I have it set up on the bench with a spare receiver at the moment.
Has anyone had similar problems please?
Hope you can help. Pics of motor attached.
Thanks.
Regards,
Jules.
 

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Terryl

Terryl

Specialist Contributor
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2,472
My Satellite Setup
OpenBox X5 on a 1 meter motorized dish.
And now a 10 foot "C" band dish.

Custom built PC
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Deep in the Boonies in the central Sierra Nevada mountains of California.
From the looks of it, the one pic showing the gear at the front (1.jpg) looks to have some sort of corrosion or scale on the left side, if water has got inside it may have messed up a limit switch, or something internal.

Have you tried to open it from that side? If not, then try just loosing the screws a bit (don't open it all the way) an see if water comes out, if so then it may be FUBAR.
 
Channel Hopper

Channel Hopper

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Have you checked the receiver is currently putting out a 5V supply to the pulse circuit ?

In installing Fibo dishes a number of years ago, the installed actuator cabling from the receiver might be the four wire / caravan affair, in which case the solution used to be to run an earth from the LNB outer sheath to provide the fifth connection .
This part may be where the corrosion is, especially if the installer could not be bothered to use proper amalgamating tape on top of the proper ribbon cable.
 
J

Julesd

New Member
Messages
8
My Satellite Setup
VU+ Duo, SAB Unix
My Location
Liverpool UK
Have you checked the receiver is currently putting out a 5V supply to the pulse circuit ?

In installing Fibo dishes a number of years ago, the installed actuator cabling from the receiver might be the four wire / caravan affair, in which case the solution used to be to run an earth from the LNB outer sheath to provide the fifth connection .
This part may be where the corrosion is, especially if the installer could not be bothered to use proper amalgamating tape on top of the proper ribbon cable.
Thanks for the quick replies Guys.
I have all 5 wires connected between STB and motor:
2 motor wires, 5v, pulse and GND.
I have opened it up on the bench and it's pretty clean inside.
I will check the 5v though.
I have gone over the solder joints on the 2 PCB's but no different.
I may open it up again and check continuity on the ribbon cables.
Is it possible the optical sensors could be at fault?

Thanks.
Regards,
Jules.
 
nelson_b

nelson_b

Contributor
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1,711
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Strong 4375 driving 1.8 C.M. offset + Inverto Black Ultra twin + BSC 421 and Zinwell C band l.n.b.,s - DR HD F15 - TM5302 and Skybox/Openbox M3 - HD receivers.+ other dishes in use - 2.4 CM offset - Alcoa 1.8 P.F. - C.M. 120.
My Location
north west yorkshire
I have all 5 wires connected between STB and motor:
2 motor wires, 5v, pulse and GND.
Is it possible the optical sensors could be at fault?.
Could be .... You might also get the fault you describe if the pulse and GND wires were connected the wrong way round ?
Regards.
 
J

Julesd

New Member
Messages
8
My Satellite Setup
VU+ Duo, SAB Unix
My Location
Liverpool UK
Could be .... You might also get the fault you describe if the pulse and GND wires were connected the wrong way round ?
Regards.
Thanks, I'll check just to make sure.
Regards,
Jules.
 
AndyX

AndyX

Member
Messages
306
Location
Scotland
My Satellite Setup
TM-F3/5
Octagon SF4800
Octagon SX88
Fibo Gregorian 1.2m
Motec Positioner
Inverto c120 twin LNB
My Location
Central Scotland
It may be the optical sensor has failed. They can be replaced with a reed sensor which makes the 5v connection redundant.
 
J

Julesd

New Member
Messages
8
My Satellite Setup
VU+ Duo, SAB Unix
My Location
Liverpool UK
It may be the optical sensor has failed. They can be replaced with a reed sensor which makes the 5v connection redundant.
It may be the optical sensor has failed. They can be replaced with a reed sensor which makes the 5v connection redundant.
Thanks, but can you explain or have any diagram for reed sensor please?
Regards,
Jules.
 
AndyX

AndyX

Member
Messages
306
Location
Scotland
My Satellite Setup
TM-F3/5
Octagon SF4800
Octagon SX88
Fibo Gregorian 1.2m
Motec Positioner
Inverto c120 twin LNB
My Location
Central Scotland
Thanks, but can you explain or have any diagram for reed sensor please?
Regards,
Jules.
Unfortunately not, however, if you look through this section there was posts from people who replaced the optical circuit. I bought a modified one myself.
 
J

Julesd

New Member
Messages
8
My Satellite Setup
VU+ Duo, SAB Unix
My Location
Liverpool UK
Unfortunately not, however, if you look through this section there was posts from people who replaced the optical circuit. I bought a modified one myself.
Thank you.
Will let you know how I get on.
Regards,
Jules.
 
Trust

Trust

Specialist Contributor
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876
My Satellite Setup
1.8 m CM at SMR 1224 + Elev. with 7 lnb changer Ku (lin - circ) - Ka (lin - circ) C (lin - circ)
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Nijmegen Netherlands
J

Julesd

New Member
Messages
8
My Satellite Setup
VU+ Duo, SAB Unix
My Location
Liverpool UK
Thanks Trust.
I have checked the 2 pcb's inside and all continuity is fine.
I may try replacing the opti sensors and the NPN trans.
Surely it should work, with a bit of luck.
Regards,
Jules.
 
Channel Hopper

Channel Hopper

Suffering fools, so you don't have to.
Staff member
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My Satellite Setup
A little less analogue, and a lot more crap.
My Location
UK
Since you have a duff motor not doing much, why not dismantle it and check continuity and differences , just in case you can make one good one with the working bits left over.
 
J

Julesd

New Member
Messages
8
My Satellite Setup
VU+ Duo, SAB Unix
My Location
Liverpool UK
Yes cheers, may do that if I get bored over the holidays!!
 
J

Julesd

New Member
Messages
8
My Satellite Setup
VU+ Duo, SAB Unix
My Location
Liverpool UK
Yes cheers, may do that if I get bored over the holidays!!
Merry Christmas Guys,
Sorted my Fibo motor.
After checking components and continuity on the 2 PCB's, I found the Opti sensor seemed to be working.
I narrowed it down to one of the 2 BC547 NPN transistors. I only had a BC549 one, replaced it with that and
Motor is working fine again, great!!
Thanks for all your help and I hope this will help others.
All the best.
Regards,
Jules.
 
Channel Hopper

Channel Hopper

Suffering fools, so you don't have to.
Staff member
Messages
28,859
My Satellite Setup
A little less analogue, and a lot more crap.
My Location
UK
Great, now for the other motor.
 
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