はじめに
It is a very common issue the AF-S VR Zoom-Nikkor ED 70-200mm f2.8G IF focus ring stuck at close end. This will show Ifixers how to fix this.
必要な工具と部品
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The lens. Focusing mechanism traps in close-up end, worsens over time.
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First, you better download the "AF-S VR Zoom-Nikkor ED 70-200mm f/2.8G IF REPAIR MANUAL". (The attatchment)
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Remove Tripod mount (The one can be removed with only hands)
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Remove tripod mount base by remove 4 screws.
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short
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long
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Unscrew switch board and disconnect all 3 FPC's
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Remove tripod ring, by removing 3 hidden screws. check the Repair Manual
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Remove 11 screws and separate rear group. There is an empty hole.
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Take the front group. remove zoom rubber ring.
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Peel the tape, and keep if you don't have a replacement.
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Remove 2 screws.
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Remove 3 screws and remove "4th Lens Group"
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Unscrew 3 outer screws and remove Aperture Blade Unit
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Remove 8 black screws and lift "Zoom Fixed Ring" and "MF Ring"
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Here is the ISSUE. internal focus ring has contact with Distance readout PCB. The PCB is mounted by double sided tape. This is a design flaw. double sided tape drifts over time, and let the PCB slip out.
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More detail. The infinity end is glued using some better glue(dark material), while the close end is NOT.
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The fix is
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Mark or remember the position BEFORE removing 2 screws and contact brush! but relax, this part is not extremely precise.
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Lift the PCB. Cleanup double sided tape. Glue the PCB back firmly against the inner edge.
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Be patient and Good Luck!!!
Be patient and Good Luck!!!
7 の人々がこのガイドを完成させました。
添付文書
13 件のコメント
Does this fault affect manual focus also ?
Thanks
It does. And might be worse, because MF sometimes goes faster than AF, then stuck deeper…
Terrance -
Will whis work even if my focus ring is stiff (but moves and “jumps”) AF works finw
Never get to know by just thinking.
Terrance -
This was exactly my problem..this guide and the Nikon repair manual were very helpful. Took a couple hours.
Hi Terrance, thank you very much for the guide. Mine has the same issue, I found a video on youtube.
https://www.youtube.com/watch?v=tFOdU76x...
It explains how to do it without full disassembly. Do you think faint-hearted ones like me should try this one instead?
Interesting, this guy’s method is easier to operate and much less work. You can also use 2-part epoxy. Not much will go wrong, just use some fine tool (ex toothpick XD ) to apply the glue.
Terrance -
This is fantastic, thank you for taking the time to put this fix together. My AF is intermittent at the close focusing end and with a little massaging the AF starts up. So this seems to be the fix to my problem.
However, I also find that the lens has opposing AF fine tune adjustments, meaning that at 70mm it front focuses and at 200mm it back focuses. Fixing one end with the +- fine tune adjustment in the D850s in camera calibration would accentuate the problem on the other end. Can this problem you show the fix to here, negatively impact the len's ability to focus to accurately focus?
I will post my experience repairing this issue, Thanks Again