I am doing a project with servo, first, it worked very well but after some days it's stopped working(i mean it didn't moved) and after removing the servo from the connection I noticed that the shaft of the servo becomes hard(tight) to move and I also tested with my other new servo and it also didn't work and after removing from the connection I again noticed that shaft of this servo also becomes hard to move than before. Whether these incidents indicate that my servo gets shorted when i connect them with the circuit or it is due to something else ??
That's the normal behaviour of the gear box in a RC servo. If a servo does no more react on a PPM signal you can dissect it and find out what fails, gear box, pot or electronics.
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If none of your servos work then the power supply may be faulty.
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Thanks for the reply, how can i solve that? the servo becomes tight and no longer working(not at all moving according to the command) so it means the servo dead? we can't use it no again?
Your post was MOVED to its current location as it is more suitable.
I know that this is picky, but servos are not controlled with a PPM signal, rather they use a PWM signal. The confusion arises because in most RC systems the PWM signal for each of the multiple servos is transmitted in a PPM stream
OTOH calling it a PWM signal gets confusing because most people will then expect a duty cycle of 0 - 100% and that the duty cycle is what's important. But in a servo signal it is the actual pulse width that is important and the duty cycle only varies around 5%-10% (and that changes with frequency). So it's a very specialised form of PWM.
Steve
Specialised or not it is still PWM and not PPM, not that most users care or need to know
Guess you found where it was moved then. 
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