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So what goes wrong with AF-S sonic motors?
#11
Right over the last couple of days the motor for the Nikkor AF-S 80-200mm F2.8D arrived, it certainly feels smoother than the existing one...as soon as my order for the motor was complete, the seller listed another...I'm thinking he has a few of these motors, they don't seem to too difficult to find.

The Nikkor AF-S 28-70mm F2.8D arrived yesterday, it's certainly a monster, in magnesium, weighing in at 1.012 kgs. The good news is the AF motor is still working, it squeaked lightly for couple of movements, and then it "shuffles along"........which is the noise they should make, then it stops at 3 meters.................. turning the focus ring I can feel something catching.

So today I start the big repair push......firstly with the 28-70!
Dave's clichés
#12
Good luck, hopefully you won't have AF accuracy nightmares once done
#13
OK the first lens the AF-S 28-70mm F2.8 lens is now repaired and working fine!

Frankly they are fiddly to work on and certainly difficult to understand how to dismantle, someone had already been in there and mashed a crosspoint screw and went no further.
Like the AF-S 70-300mm VR that I repaired before I didn't find much wrong, checked out the distance scale which is poorly mounted....the motor squeaked when turned by hand. The aperture lever/mechanism is baffling as I couldn't understand why the lens stayed half open when unmounted.....+4 glass and a head torch showed the mechanism was two levers that had to be parted.......not in the least bit obvious.
I also raided three dud SLRs and stripped the for springs screws etc.

Re-assembling the AF-S 80-200mm F2.8 is a more serious job with a lot more stuff to remember....so I'll go in there in the next few days!

Oh onward and upward!
Dave's clichés
#14
(05-08-2018, 03:24 PM)davidmanze Wrote: OK the first lens the AF-S 28-70mm F2.8 lens is now repaired and working fine!

Frankly they are fiddly to work on and certainly difficult to understand how to dismantle, someone had already been in there and mashed a crosspoint screw and went no further.
Like the AF-S 70-300mm VR that I repaired before I didn't find much wrong, checked out the distance scale which is poorly mounted....the motor squeaked when turned by hand. The aperture lever/mechanism is baffling as I couldn't understand why the lens stayed half open when unmounted.....+4 glass and a head torch showed the mechanism was two levers that had to be parted.......not in the least bit obvious.
I also raided three dud SLRs and stripped the for springs screws etc.

Re-assembling the AF-S 80-200mm F2.8 is a more serious job with a lot more stuff to remember....so I'll go in there in the next few days!

Oh onward and upward!

There's an African proverb that says: "If you don't know where to go, look from where you come"
When the repairs guy here refused to repair my 24-200 since it's not worth the effort, he advised me " when disassemble the lens record it with video, this way it's easier to go back"
You lose nothing by doing it, video with phones is quite easy now
#15
I did set out with a view to filming it....but the thought of seeing me constantly losing things .....grovelling on the floor looking for dropped screws, in terms of curses and bad language it would have to be X rated!..

...in the end I took step by step shots..
Dave's clichés
  


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