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Replacing LED boards in ASIs LED Illuminator(MIM-LED-LAMP)

This Technical note walks users thru on how to replace the LED board(or LED) in ASIs LEDs illuminator (MIM-LED-LAMP or MIM-LED-LAMP-NR assembly)

Tools Needed
  • 1.5mm Hex key or allen wrench
  • 2mm Hex key or allen wrench
  • 2.5mm Hex Key or allen wrench

Step 1: Removing Illuminator from Microscope

The MIM-LED-LAMP assembly consists of the Cap (which houses the LED board and acts like a heatsink) and the Condenser Lens.

MIM-LED-LAMP assembly with the Cap and Condenser lens

Separate the MIM-LED-LAMP assembly from rest of the microscope(or RAMM). The Condenser lens is held on the microscope with Three 2mm setscrews. Use a 2mm allen wrench to loosen the setscrews and detach it from the scope.

Location of the three 2mm setscrews that tie the Assembly to microscope body

Step 2: Removing the Condenser lens

Now Separate the Cap from the Condenser lens. The Cap and the Condenser lens ring are held together with three 1.5mm set screws. User a 1.5mm allen wrench to unscrew them. Location is shown in pictures below.

Location of the three 1.5mm setscrews that hold Cap and Lens ring together

Step 3: Removing the LED board

We are down to the Cap.


LED board is held inside with a C ring and three M2.5 screws

LED board is held inside with a C ring and three M2.5 screws

Use a 2.5mm Allen wrench to screw the three M2.5 screws. This will separate the LED board from the cap.

2.5mm Allen wrench to screw the three M2.5 screws

Step 4 : Reassembly with new LED board

Now to reassemble the Illuminator with the new LED board. Drop it into the cap. Orient it such that the Connector is accessible thru the opening.

Then drop the C ring onto the board.

Use your finger to apply pressure and hold the C ring and board in place.

Flip the Cap so you can access the Mounting holes for the M2.5 screws.

Drop the three M2.5 screws one by one and screw it to the C ring thru the LED board.

Step 5 : LED board XY alignment

User might notice that there is a lot of clearance on the M2.5 mounting holes. This is to give the user flexibility in adjusting the LED boards XY position to better align with the microscope optics.

For now , try to position the LED board as close to cap center, and the LED boards's connector is in middle of the connector's openinging.

The Three M2.5 screws are accessible even when the illuminator is fully assembled.User can go board loosen these screws and adjust the xy position of the LED board anytime.

Step 6:Attaching and Aligning the condenser lens

ReAttaching the condenser lens. The Lens needs to be at a certain distance from the LED board to focus the light correctly. The procedure is as follows.

  • Put the Condenser lens into the Cap , do not tighten the set screws yet.
  • Power the LED Illuminator , and shin the light onto a distant wall (about 6 feet away)
  • Now Focus the condenser lens assembly in and out of the cap, until you see an image of the LED die.
  • Lock this focus , by tightening the three 1.5mm setscrews.

LED die image , focused on a distant wall

Assembly is complete, reattach the Illuminator back onto the scope. Contact support[at]asiimging[dot]com for additional support if needed.

Address: 29391 W Enid Rd. Eugene, OR 97402, USA | Phone: +1 (541) 461-8181
replacing_leds.txt · Last modified: 2019/04/18 23:35 (external edit)