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Nook Color Circuit Board Touch Up Using An Ultrasonic Cleaner

Barnes and Noble stepped up their game in the portable reading gadget arena with their Nook Color offering. The device has a receptive 7-inch multi touch screen which delivers 16 million colors vividly right on every user’s palm. Reading is also made easier with a customizable font style and size to fit any reading requirements. You can also check your email and read the news on the go with the Nook Colors built-in Wifi capabality. Keep your gadgets performing at their best with regular maintenance. An ultrasonic cleaner can be trusted to keep your Nook Color’s printed circuit board(PCB) dirt-free.

Nook Color units can take a lot of abuse including being left out in the rain, dropped in the soup or otherwise rendered inoperable. Unless your Nook Color is irreparably damaged, it can most likely be restored to operation in an ultrasonic printed circuit board cleaner. With the same technology used by printed circuit board manufacturers, ultrasonic circuit board cleaning quickly and safely removes contaminants from the delicate components in your Nook Color.

Here you will learn:

  • How an Ultrasonic PCB Cleaner Works
  • How to Select and Set Up your Circuit Board Cleaner
  • How to Disassemble, Clean and Reassemble your Nook Color

How Ultrasonic PCB Cleaners Work to Restore Your Nook Color

Ultrasonic cleaners are used in a wide range of applications to remove virtually any soil or contamination by using the power of cavitation action. This is the term used to describe the implosion of billions of minute bubbles contacting Nook Color components and surfaces. The bubbles are created by generator-powered ultrasonic transducers bonded to an ultrasonic cleaning tank and typically operate at an ultrasonic frequency of 37 to 42 kHz (37,000 to 42,000 cycles per second).

When the bubbles implode contaminants are quickly and safely removed from PCB surfaces without damaging delicate parts. So tiny are the bubbles that they penetrate minute cracks, crevices and blind holes that might lodge dried residue, dust and dirt particles. The ultrasonic PCB cleaning system will complete the job in as little as 10 to 15 minutes. And it will do it in an environmentally friendly manner because the ultrasonic circuit board cleaning solution formula is a biodegradable concentrate that minimizes disposal problems.

How to Select and Set Up your Nook Color Circuit Board Ultrasonic PCB Cleaner

Ultrasonic PCB cleaners come in a variety of sizes from bench top units to a floor-mounted industrial ultrasonic cleaning machine, so you can select any size you need. Our most popular models for cleaning Nook Color circuit boards are the ¾ gallon Elma EH075EL and 1½ gallon Elma EH150EL. You should select an ultrasonic PCB cleaner equipped with a frequency sweep function, such as this Elma Transonic, to prevent damage to sensitive components during cleaning. Choose a model also equipped with a heater to improve the ultrasonic cleaning process.

Whatever the model and size of ultrasonic circuit board cleaner you use there are steps to take before cleaning begins.

  1. Fill the ultrasonic cleaner tank to the fill line (or approximately 2/3 full) with ultrasonic cleaning solution such as Elma tec clean A1 diluted 1:20 with water.
  2. Turn on the ultrasonic cleaner, set the heater to approximately 50°C, and operate for about 30 minutes to drive off cavitation inhibiting entrained air. Degassing is complete when bubbles stop coming to the surface and must be performed every time the tank is filled with fresh circuit board cleaning solution.

How to Disassemble, Clean and Reassemble your Nook Color

Step 1: Disassembling your Nook Color

Before you begin, make sure that you have a T5 screw driver and a small flat head screw driver or a thin case opening tool. Start by removing the two screws in the SD card area. There will be a couple of black pieces of paper. Remove these to take the back cover off your device. To remove the rear cover completely, insert the flat head screw in between the case and the unit’s body. Now that the internal back cover is exposed, use a T5 screw driver to do away with the screws that keep it in place. Now gently pull the front cover off. Note that it has a certain kind of adhesive tape or glue which will make separating a little difficult. Next, detach both the volume and power buttons found on each side of the device.

Now that the outer layers of your Nook Color are out of the way, gently pull the LCD screen off of the internal back cover. Expect that the volume button and the battery pack would prevent you from doing this. You can insert your flat head screw driver through the side of the volume button. Find the chords attached to the battery pack and gently tweak to release it. Pull lightly to separate both components completely.

To remove the LCD screen from the circuit board, carefully peel the tape on the left side. Lift the small switch found near the tape. Do the same thing for the longer matte tape found on the other side. Make sure that you do not snap two of the hinges found on the lower right hand corner when you release the LCD from the mother board.

You now hold in your hand, your Nook Color circuit board.

Congratulations! You have successfully removed your circuit board from your Nook Color! You may now proceed with the next step.

Step 2: Cleaning the Printed Circuit Board

Set the PCB ultrasonic cleaner’s thermostat to 50°C and activate the Sweep mode. While the solution is heating, place your PCB in the basket. If you are cleaning more than one at a time take care that they do not touch each other. Once the operating temperature is reached lower the basket into the cleaning solution and set the timer for 10 minutes. Cleaning time depends on the condition of the PCBs and may have to be adjusted.

At the end of the cycle remove the components from the ultrasonic bath. If they are not clean replace them in the bath until the cleaning is complete. Then rinse them in distilled or deionized water to remove all traces of the cleaning solution and avoid water spotting. Dry them with an air blower or warm air dryer.

Safety note: DO NOT reach into an operating ultrasonic bath. Instead remove the basket if you want to inspect or rearrange the parts.

Step 3: Reassembling your Nook Color

Begin by reattaching the LCD screen to the circuit board. To do so, focus on the board’s side which has six golden pallets. Fit the LCD screen on this side as it originally did. Make sure that the hinges found on each side are aligned to their appropriate places. Then flip to the other side of the circuit board to flatten out the longer matte tape on the right hand side. Before doing the same thing to the tape on the opposite side, lift the lid and carefully insert it to the connector. Make sure that the attachment is properly closed before sealing it with the protective tape.

Now that you have the LCD and the circuit board in one piece, attach the internal back cover to the assembly. Use a piece of cloth or paper to support the screen. Lay the internal back cover on top of your assembly with the LCD screen facing down the table. Look for two foam tops on the upper left hand corner of your device. These are for volume and battery. Carefully align the pins of the foam tops to the connectors below by poking the holes with your small screw driver. Adding a little force may be necessary to carry this out.

Flip the assembly, turning the LCD screen on top this time. Then place the power button on the upper left hand side of the assembly and do the same thing for the volume button on the other side. Fit the front cover around the LCD before pressing it gently to attach well. After setting the front cover, you may return all gripping screws. Now put the external back cover in its proper place. Return the screws detached near the SD port.

Admire the piece of work you just put back together.

Voila! Start your device and your Nook Color should be good to go.

More Operating Tips

Any contaminants that rise to the surface of the bath should be skimmed off and disposed of properly. When the circuit board cleaning solution becomes discolored or cleaning takes longer it is time to replace it. Drain the tank and dispose of the spent solution according to local regulations. Take the time to remove any material that settled to the bottom of your ultrasonic cleaning machine. Clean the tank using a cleaning process recommended by the manufacturer.

Questions: Contact the iultrasonic ultrasonic cleaning experts at 973 821-4400

Disclaimer: This advice is not provided by a licensed technician. Follow at your own risk. We assume no liability for any damages caused by following the advice in this article.


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