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replacing_leds [2017/03/29 18:51]
vik
replacing_leds [2019/04/18 23:35] (current)
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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.
 +
 +{{ led_assembly_16.jpg?​direct&​300 |}}
 +
 +[{{ led_assembly_15_.jpg?​direct&​300 |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.
 +
 +[{{ led_assembly_1_.jpg?​direct&​300 |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. ​
 +
 +{{ led_assembly_2_.jpg?​direct&​300 |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_assembly_3_.jpg?​direct&​300 |LED Cap}}
 +
 +[{{ led_assembly_4_.jpg?​direct&​300 |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.
 +
 +[{{ led_assembly_5_.jpg?​direct&​300 |2.5mm Allen wrench to screw the three M2.5 screws}}]
 +
 +{{ led_assembly_7_.jpg?​direct&​300 |}}
 +
 +====  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. ​
 +
 +{{ led_assembly_8_.jpg?​direct&​300 |}}
 +
 +Then drop the C ring onto the board. ​
 +
 +{{ led_assembly_9_.jpg?​direct&​300 |}}
 +
 +Use your finger to apply pressure and hold the C ring and board in place. ​
 +
 +{{ led_assembly_10_.jpg?​direct&​300 |}}
 +
 +Flip the Cap so you can access the Mounting holes for the M2.5 screws. ​
 +
 +{{ led_assembly_11_.jpg?​direct&​300 |}}
 +
 +Drop the three M2.5 screws one by one and screw it to the C ring thru the LED board. ​
 +
 +{{ led_assembly_12_.jpg?​direct&​300 |}}
 +
 +==== 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. ​
 +
 +{{ led_assembly_17.jpg?​direct&​300 |}}
 +
 +
 +{{ led_assembly_18.jpg?​direct&​300 |}}
 +
 +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_assembly_14_.jpg?​direct&​300 |}}
 +
 +[{{ led_assembly_13_.jpg?​direct&​300 |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. ​
 +
 +
 +
 +{{tag>​LED tech_note ramm}}