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Solve stuck focus of AF-S VR Zoom-Nikkor ED 70-200mm f2.8G IF

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  1. Solve stuck focus of AF-S VR Zoom-Nikkor ED 70-200mm f2.8G IF, Solve stuck focus of AF-S VR Zoom-Nikkor ED 70-200mm f2.8G IF: 手順 1、 1の画像 1
    • The lens. Focusing mechanism traps in close-up end, worsens over time.

  2. Solve stuck focus of AF-S VR Zoom-Nikkor ED 70-200mm f2.8G IF, Separate front and rear group: 手順 2、 3の画像 1 Solve stuck focus of AF-S VR Zoom-Nikkor ED 70-200mm f2.8G IF, Separate front and rear group: 手順 2、 3の画像 2 Solve stuck focus of AF-S VR Zoom-Nikkor ED 70-200mm f2.8G IF, Separate front and rear group: 手順 2、 3の画像 3
    • First, you better download the "AF-S VR Zoom-Nikkor ED 70-200mm f/2.8G IF REPAIR MANUAL". (The attatchment)

    • Remove Tripod mount (The one can be removed with only hands)

    • Remove tripod mount base by remove 4 screws.

    • short

    • long

    • Unscrew switch board and disconnect all 3 FPC's

    • Remove tripod ring, by removing 3 hidden screws. check the Repair Manual

    • Remove 11 screws and separate rear group. There is an empty hole.

  3. Solve stuck focus of AF-S VR Zoom-Nikkor ED 70-200mm f2.8G IF, Remove 4th Lens Group: 手順 3、 2の画像 1 Solve stuck focus of AF-S VR Zoom-Nikkor ED 70-200mm f2.8G IF, Remove 4th Lens Group: 手順 3、 2の画像 2
    • Take the front group. remove zoom rubber ring.

    • Peel the tape, and keep if you don't have a replacement.

    • Remove 2 screws.

    • Remove 3 screws and remove "4th Lens Group"

  4. Solve stuck focus of AF-S VR Zoom-Nikkor ED 70-200mm f2.8G IF, Remove Zoom Fixed Ring: 手順 4、 3の画像 1 Solve stuck focus of AF-S VR Zoom-Nikkor ED 70-200mm f2.8G IF, Remove Zoom Fixed Ring: 手順 4、 3の画像 2 Solve stuck focus of AF-S VR Zoom-Nikkor ED 70-200mm f2.8G IF, Remove Zoom Fixed Ring: 手順 4、 3の画像 3
    • Unscrew 3 outer screws and remove Aperture Blade Unit

    • Do NOT manipulate the Aperture calibration screw! (RED mark)

    • Do NOT manipulate the whatever calibration screw! (YELLOW mark)

    • Remove 8 black screws and lift "Zoom Fixed Ring" and "MF Ring"

  5. Solve stuck focus of AF-S VR Zoom-Nikkor ED 70-200mm f2.8G IF, Reposition the PCB: 手順 5、 3の画像 1 Solve stuck focus of AF-S VR Zoom-Nikkor ED 70-200mm f2.8G IF, Reposition the PCB: 手順 5、 3の画像 2 Solve stuck focus of AF-S VR Zoom-Nikkor ED 70-200mm f2.8G IF, Reposition the PCB: 手順 5、 3の画像 3
    • 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.

  6. Solve stuck focus of AF-S VR Zoom-Nikkor ED 70-200mm f2.8G IF: 手順 6、 3の画像 1 Solve stuck focus of AF-S VR Zoom-Nikkor ED 70-200mm f2.8G IF: 手順 6、 3の画像 2 Solve stuck focus of AF-S VR Zoom-Nikkor ED 70-200mm f2.8G IF: 手順 6、 3の画像 3
    • More detail. The infinity end is glued using some better glue(dark material), while the close end is NOT.

    • The fix is

    • Mark or remember the position BEFORE removing 2 screws and contact brush! but relax, this part is not extremely precise.

    • Lift the PCB. Cleanup double sided tape. Glue the PCB back firmly against the inner edge.

    • Use proper glue, like "high viscous super glue" or "2-part epoxy resin". Do NOT use low viscous glue, it will mess up and contaminate the contacts.

    • Now put it back, following these instructions in reverse order.

    • Screw tighten torque list.

    • Internal M1.6 screws: 0.12N.m.

    • Tripod mount M2.0 screws: 0.2N.m.

    • 2 screws on switch panel: 0.06~0.08N.m (watch out the plastic is very fragile)

終わりに

Be patient and Good Luck!!!

7 の人々がこのガイドを完成させました。

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作成者

1人の作成者と共同作成されました。

Terrance

メンバー登録日: 11/17/09

6,359 ポイント

17のガイドは作成済み

13 件のコメント

Does this fault affect manual focus also ?

Thanks

Arnold Livingston - 返信

It does. And might be worse, because MF sometimes goes faster than AF, then stuck deeper…

Terrance -

Hi Terrance,

So is your lens good til now after this fix? By the way, what type of glue specifically did you use?

t2psalm - 返信

Good as brand new :D. I used “super glue“ and learned the lesson. Luckily the mess is not very bad, cleaned that up and the great lens is happy again.

Terrance -

Will whis work even if my focus ring is stiff (but moves and “jumps”) AF works finw

philippscaglia - 返信

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.

jwphotographycharleston - 返信

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?

Mohamed Malik - 返信

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 -

It works - perfect. Thank you so much!

gsmax - 返信

Distance PCB is available throu 2 windows on focus ring. It is hard to properly re-glue it via them, but you may check the issue and fix it temorally this way

belyavin - 返信

you can try apply a little drop of epoxy to the creeping end of that PCB through the small window.

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

Mike Connor - 返信

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