Nikon Coolscan IV ED or LS-40 ED teardown and repair

13 Apr 2024
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Got this one purchased on Ebay and shipped from France ! I got pretty bashed up in the transit 🙁

Specs

  • 2, 900dpi optical resolution
  • 2,870×4,332 pixels
  • Nikkor ED high-resolution lens
  • Autofocus and Manual Focus
  • A/D Conversion 12-bits
  • 36-bit colour depth
  • USB interface
  • 3.6 dynamic range
  • Digital ICE3 Image improvement
  • Costs around 600

Video

https://youtu.be/23A8W4svkWI

Teardown Photos

Nikon Coolscan IV ED broken in mail top view
Nikon Coolscan IV ED broken in mail top view
Nikon Coolscan IV ED broken in mail bottom of the front panel is broken
Nikon Coolscan IV ED broken in mail bottom of the front panel is broken
Nikon Coolscan IV ED leadscrew stopper
Nikon Coolscan IV ED leadscrew stopper
Nikon Coolscan IV ED bent leadscrew
Nikon Coolscan IV ED bent leadscrew
Nikon Coolscan IV ED bent leadscrew
Nikon Coolscan IV ED bent leadscrew
Nikon Coolscan IV ED bent leadscrew fixing rig, which did not work after all
Nikon Coolscan IV ED bent leadsrew fixing rig, which did not work after all
Nikon Coolscan IV ED bent leadscrew fixing rig, which did not work after all
Nikon Coolscan IV ED bent leadscrew fixing rig, which did not work after all
Nikon Coolscan IV ED bent leadscrew, straighten as far as I could
Nikon Coolscan IV ED bent leadscrew, straighten as far as I could
Nikon Coolscan IV ED repaired leadscrew
Nikon Coolscan IV ED repaired leadscrew
Nikon Coolscan IV ED Assembling the scanner sled after leadscrew repair
Nikon Coolscan IV ED Assembling the scanner sled after leadscrew repair
Nikon Coolscan IV ED Attaching slide/film adapter holder
Nikon Coolscan IV ED Attaching slide/film adapter holder
Nikon Coolscan IV ED Attaching bracket to hold riddon cables
Nikon Coolscan IV ED Attaching bracket to hold riddon cables
Nikon Coolscan IV ED Attaching bracket to hold riddon cables
Nikon Coolscan IV ED Attaching bracket to hold riddon cables
Nikon Coolscan IV ED Attaching film guide
Nikon Coolscan IV ED Attaching film guide
Nikon Coolscan IV ED Attaching film guide
Nikon Coolscan IV ED Attaching film guide
Nikon Coolscan IV ED Securing film guide plate
Nikon Coolscan IV ED Securing film guide plate
Nikon Coolscan IV ED Attaching Top frame
Nikon Coolscan IV ED Attaching Top frame
Nikon Coolscan IV ED Attaching Powersupply
Nikon Coolscan IV ED Attaching Powersupply
Nikon Coolscan IV ED Attaching sensor ribbon cable and ferride ring
Nikon Coolscan IV ED Attaching sensor ribbon cable and ferrite ring
Nikon Coolscan IV ED Attaching Main Board
Nikon Coolscan IV ED Attaching Main Board
Nikon Coolscan IV ED Working and scanning using Vuescan and some Iogear USB2 hub
Nikon Coolscan IV ED Working and scanning using Vuescan and some Iogear USB2 hub

Power Supply Repair

Power supply was diagnosed as non working and voltages were super low.

After using ESR meter I was able to identify 2 bad electrolytic capacitors ! They were replaced by close in value 47 uf / 50 V. After that voltages were all good. See the video for detailed repair

Nikon Coolscan IV ED Attaching Powersupply
Nikon Coolscan IV ED Attaching Powersupply

Mirror Cleaning

Nikon Coolscan IV ED Clean Mirror locked to the scanning sled
Nikon Coolscan IV ED Clean Mirror locked to the scanning sled
Nikon Coolscan IV ED Clamps Holding the main scanner mirror
Nikon Coolscan IV ED Clamps Holding the main scanner mirror
Nikon Coolscan IV ED Dirty Mirror
Nikon Coolscan IV ED Dirty Mirror
Nikon Coolscan IV ED Best and easy way to place mirror in the scanning sled ( upside down )
Nikon Coolscan IV ED Best and easy way to place mirror in the scanning sled ( upside down )

Documentation

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