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.

Insert wisdom here.
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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) Remove Tripod mount (The one can be removed with only hands) Remove tripod mount base by remove 4 screws.
  • 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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Take the front group. remove zoom rubber ring. Peel the tape, and keep if you don't have a replacement.
  • 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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Deck the Halls
With tools and Fix Kits
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)
  • 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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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. 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. 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.
  • 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. The fix is Mark or remember the position BEFORE removing 2 screws and contact brush! but relax, this part is not extremely precise.
  • 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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