Introduction

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.

Image 1/1:
  • Insert wisdom here.

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Image 1/3: Remove Tripod mount (The one can be removed with only hands) Image 2/3: Remove tripod mount base by remove 4 screws. Image 3/3: short
  • 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 a empty hole.

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Image 1/2: Peel the tape, and keep if you don't have a replacement. Image 2/2: Remove 2 screws.
  • 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"

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Image 1/3: Do NOT manipulate the Aperture calibration screw! (RED mark) Image 2/3: Do NOT manipulate the whatever calibration screw! (YELLOW mark) Image 3/3: Remove 8 black screws and lift "Zoom Fixed Ring" and "MF Ring"
  • 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"

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Image 1/3: Image 2/3: Image 3/3:
  • 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.

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Image 1/3: The fix is Image 2/3: Mark or remember the position BEFORE removing 2 screws and contact brush! but relax, this part is not extremely precise. Image 3/3: Lift the PCB. Cleanup double sided tape. Glue the PCB back firmly against the inner edge.
  • 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.

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  • 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)

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Conclusion

Be patient and Good Luck!!!

Attached Documents

Terrance

Member since: 11/17/2009

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