Otis Singleton
Oral-B electric toothbrushes are popular oral care products manufactured by Braun. Like all electronic devices, they require maintenance and occasional repairs. This guide will focus on how to open and repair Oral-B electric toothbrushes, specifically the Braun Oral-B Professional Care Type 3754 and 3756 models, as well as the Braun Vitality line. We will also discuss battery replacement and provide step-by-step instructions to ensure a proper understanding of the process.
Characteristics and Values Table for Opening an Oral B Electric Toothbrush
| Characteristics | Values |
|---|---|
| Type of toothbrush | Braun Oral-B Professional Care Type 3754 and 3756 |
| Other models with similar procedures | Professional Care, PRO and TriZone 600, 1000, 2000, and 3000 |
| Tools required | Small adjustable spanner |
| Steps to open | 1. Place the spanner around the flat white plastic part of the toothbrush. 2. Twist the spanner anti-clockwise by about 30 degrees. 3. The white plastic part should disengage from the main body. 4. Slide out the inner mechanism, being careful not to lose the spring at the bottom. |
| Battery replacement | Measure the battery length to consider a longer, higher-capacity option. |
| Printed Circuit Board (PCB) | Controls charging and drives the motor. |
| Reassembly | Ensure proper alignment of the switch on the PCB with the button molding on the case. |
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What You'll Learn
Use a small adjustable spanner to twist the toothbrush's white plastic part
To open an Oral B electric toothbrush, you will need a small adjustable spanner. This is a technical and tricky task, so it is important to follow all steps carefully. Firstly, remove the brush head and store it in a hygienic place. Then, place the spanner around the flat white plastic part of the toothbrush and start twisting it anticlockwise. Twist the spanner until you reach a 30-degree angle, at which point the white plastic part should separate from the main body of the toothbrush.
It is important to note that you should not use too much force when twisting the spanner, as this can damage the toothbrush. Additionally, make sure to be cautious of the spring at the bottom of the instrument, inside the copper coil, as it is essential for the proper functioning of the toothbrush. Once the white plastic part is separated, the inner mechanism should slide out easily. You can then proceed with any necessary repairs or replacements.
It is worth noting that some sources suggest that disassembling an electric toothbrush may not be worth the aggravation of disassembly and reassembly, and there is a risk of losing waterproofing. However, if you are careful and follow the instructions, it is possible to safely open and repair your Oral B electric toothbrush.
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De-solder the tabs holding the PCB and cell in place
De-soldering the tabs that hold the PCB and cell in place is a delicate process that requires precision and caution. Before you begin, ensure you have the necessary tools, such as a soldering iron, solder sucker, and side cutters.
First, locate the PCB (Printed Circuit Board) and identify the tabs connecting it to the cell (battery). There should be four tabs in total: two connecting to the motor and two connecting to the positive and negative ends of the cell. To begin the de-soldering process, use side cutters to carefully clip or snip the tabs connecting the PCB to the cell. This step will require a steady hand to avoid damaging the surrounding components.
Once the tabs are cut, use a solder sucker or braid to clean up any remaining solder on the tabs and in the holes left behind. This step is crucial for ensuring a clean surface for the new battery's installation. After de-soldering, inspect the PCB for any signs of damage, especially around the positive connections, as this area is more susceptible to damage during the process.
If your toothbrush is a Braun Oral-B iO series model, you may need to open the handle to access the PCB and cell. This can be done by protecting the base cap with tape and then using grips to turn and open the base cap. Once you have accessed the PCB and cell, you can proceed with the de-soldering process as described above.
Remember, de-soldering can be a challenging task, and mishandling can result in further damage to your toothbrush. If you are uncomfortable with any part of the process, it may be safer to consult a professional or consider replacing the entire toothbrush.
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Remove the battery
Before you start, it's important to note that Oral-B electric toothbrushes come with sealed rechargeable batteries that the manufacturer does not intend for users to replace. Opening the toothbrush will likely void your warranty, and there is a risk of damaging the internal components. If you're confident in your abilities, proceed with caution and follow a reliable guide.
Now, to remove the battery from your Oral-B electric toothbrush, you'll need to first disassemble the toothbrush. This process may vary depending on the model of your toothbrush, but generally, you'll need to separate the toothbrush body from the brush head. Place your thumb on the top of the toothbrush assembly and press down, then pull the toothbrush assembly out through the opening at the bottom end of the toothbrush body.
Once the toothbrush is disassembled, you'll need to locate the battery. The battery is usually found at the bottom of the toothbrush assembly. Be careful not to lose any small parts, such as the spring, during this process.
To remove the battery, simply pull it out of its recess. If the battery is seated tightly, you may use a plastic tool like a spudger to gently pry it out. Be very careful not to use excessive force or metal tools, as this could damage the battery or other internal components. Do not reinstall a damaged or deformed battery, as it may pose a safety hazard.
If your toothbrush model has a soldered battery, you will need to use a soldering iron to remove it. De-solder the tabs that hold the PCB (Printed Circuit Board) and the cell (battery) in position. There are typically four tabs: two connected to the motor and two connected to the positive and negative ends of the cell. Bend the negative tab on the cell upward to allow the PCB to be removed, then lift it away from the mechanism. After this, the cell can be slid out of the body of the mechanism.
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Measure the battery and consider fitting a longer one
To measure the battery of your Oral B electric toothbrush, you will first need to open the toothbrush. This can be done by using a small adjustable spanner and placing it around the flat of the white plastic part of the toothbrush. Then, twist the spanner anticlockwise. After twisting about 30 degrees, the white plastic should disengage from the main body of the toothbrush. Once released, the inner mechanism, including the battery, should slide out easily.
Next, set aside the main body and the spring, as these won't be needed until you reassemble the toothbrush. On one side of the mechanism is the PCB (Printed Circuit Board), which controls the charging of the cell (battery) and drives the motor. The PCB also has a momentary push button near the top. Turn the mechanism over to locate the cell (battery).
Now, you can measure the battery. If your battery measures 42mm in length, you may have the option of fitting a longer battery. A longer battery will have a higher electrical capacity (mAh) and will run for longer between recharges.
When choosing a replacement battery, ensure that it matches your device's specifications exactly. Wrong voltage or size could damage your toothbrush. If the battery is soldered in, you will need a steady hand and tools such as a soldering iron. Apply just enough solder for a secure connection, as too much or too little can cause issues.
Finally, when reassembling your toothbrush, ensure that everything is snapped or screwed tightly to maintain the toothbrush's waterproof integrity.
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Re-solder the joints and re-assemble the toothbrush
Re-soldering the joints of an Oral B electric toothbrush is a delicate process that requires precision and patience. Here is a detailed guide on how to successfully re-solder and reassemble your toothbrush:
Re-soldering the Joints:
First, ensure you have the necessary tools, including a soldering iron, a small adjustable spanner, and a replacement battery if you are replacing the cell. Before beginning any soldering work, inspect the solder joints carefully with a magnifying glass, paying particular attention to any non-surface-mount components. In the case of the Oral B electric toothbrush, you will need to re-solder four joints. Two of these tabs connect to the motor, while the other two connect to the positive and negative ends of the cell. When re-soldering, remember to bend the negative tab 90 degrees to enable it to be soldered to the PCB (Printed Circuit Board).
Reassembling the Toothbrush:
After re-soldering, it is time to reassemble the toothbrush. Start by inserting the spring at the base into the coil. Then, slide the assembly back into the body of the toothbrush. Ensure that the parts are correctly aligned by checking that the switch on the PCB lines up with the button molding on the outside of the case. Once aligned, press the two parts firmly together; they should snap together securely.
Testing and Charging:
Initially, your toothbrush may not work, but do not be alarmed. Place the toothbrush back on its charging cradle momentarily to re-energize the internal chip. After this, give it a full 24-hour charge before testing. Before you turn on your toothbrush, ensure that it is seated correctly on the charger. For smart models, a simple reset may be required to reawaken the circuits. Hold the power button for 10-15 seconds to perform a soft reset.
Maintenance and Precautions:
Remember to handle your toothbrush with care and keep it covered when travelling to prevent dust and dirt from accumulating. Additionally, rinse your toothbrush with tap water after each use to remove toothpaste and debris. Finally, always be cautious when working with soldering irons and ensure that all connections are secure before proceeding with the reassembly.
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Frequently asked questions
You will need a small adjustable spanner. Place this around the flat of the white plastic part of the toothbrush and twist the spanner anticlockwise. After twisting about 30 degrees, the white plastic should disengage from the main body of the toothbrush.
Once opened, the inner mechanism should slide out easily. Take care not to lose the spring at the bottom of the mechanism (inside the copper coil). Set aside the main body and the spring—you won't need these until you reassemble the toothbrush.
De-solder the four tabs that hold the PCB (printed circuit board) and the cell (battery) in position. The PCB controls the charging of the cell and drives the motor. Once this is done, the PCB can be lifted away, and the cell can be slid out of the body of the mechanism.
Measure your battery and if it is 42mm long, you could fit a longer battery, which will have a higher electrical capacity and will run longer between recharges.
