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Looks like one of the motor connections and one end of the battery connection (near the coil) are dry soldered (for the unknowns – it is basically soldering was not done correctly and so disconnected). So, I soldered those two points and voila!! it worked. However, I noticed that red light was blinking when I pressed the button on the PCB (before re-assembling) but I do not see it when I pressed the button after I re-assembled. So, I will watch out for it after a complete discharge.
The first piece to remove from the internal assembly is the power switch plate. This is clipped in on both sides at the top of the brush, see the arrows below. Carefully unclip it from one side, then the other: Measure your battery and if it is 42mm long you might have the option of fitting a longer battery instead. Because it is physically larger, a longer battery will have a higher electrical capacity (mAh) and will run for longer between recharges. Do you notice how the metal tag on the positive terminal extends horizontally away from the battery? Take a look at the picture below to see how the positive tag extends through some empty space inside the handle. It removes up to 100% more plaque than a standard manual toothbrush for healthier gums and it starts making your smile whiter as of the first day of brushing by removing surface stains. Not only this, but the toothbrush helps you protect your delicate gums with the 360 ̊gum pressure control technology that reduces brushing speed and alerts you to be gentler if you brush too hard.The tip above about where to press the handle to get the base off was a great one and should be in the instructions. Additional heating did not hurt and nothing broke. Oral-B PRO 3 and brush heads are designed to work together for an optimal clean. From CrossAction to Precision Clean, to 3D White, to Floss Action, Oral-B brush heads deliver a superior clean vs. a manual toothbrush.
Locate the two solder points for the motor (arrowed below) and desolder them, bending the tags upright with a knife so they are disconnected from the circuit board. To avoid brush head breakage which may generate a small part choking hazard or damage teeth: Prior to each use, ensure the brush head fits well. Discontinue use of the toothbrush if brush head no longer fits properly. Never use without a brush head. If the product is dropped, the brush head should be replaced before the next use even if no damage is visible. Compatible with a variety of Oral-B refill heads for every dental need. Brush heads should be replaced every 3 months. With our Vitality and PRO toothbrushes, it can sometimes be difficult to know when they’re correctly switched off. If they’re on the charger while switched on, they won’t charge correctly. The best thing to do is to put it on the charger for 30 minutes or so, and then try to switch it on. If it switches on, that’s great, and it was correctly switched off while charging. However, if doesn’t switch on, that might mean that it wasn’t switched off during charging.
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This feature protects your gums by signalling you if you're brushing too hard. The 360° pressure sensor turns red and automatically slows brush speed. Time to get your soldering iron warmed up now! Starting with the negative one (nearest the coil of copper wire), use the soldering iron and desolder pump to carefully desolder the two battery terminals on the circuit board (arrowed below, positive on the left and negative on the right) and bend the metal tabs vertical and away from the board with a knife so there is no solder left joining the solder tag to the board. Desoldering braid might also be useful for this. Remove the handle from the charger and the base of the handle should come off. The spring might fall out so don’t lose it! Be sure you’re charging for the full time noted in the manual. For iO series as of 7 it takes 3 hours. For iO 6, Genius and Smart range and Pro 3 it takes 12 hours. For our Vitality toothbrushes, that’s 16 hours. For the other brushes, they should be charged for up to 24 hours.
Trust the consistent battery performance of the Oral-B Cross Action battery toothbrush for a superior deep clean in hard to reach places. Improve your oral health by removing more plaque than a regular manual toothbrush with each use. If it hasn’t already fallen out remove the spring from inside the coil in base of the handle and put it somewhere safe.At this point you might realise that you have fallen victim to Braun’s designed-in obsolescence and non-repairability if the plastic tab at the front of the base breaks off. This makes it more difficult for the toothbrush to be repaired (see below.) All our toothbrushes apart from the Vitality and PRO 500 have a charging light. It should blink green during charging. Note that this can take up to 15 minutes to start happening if the toothbrush was entirely drained of battery during brushing. When charging is complete, the blinking should stop. Unclip the carrier for the pressure warning light wires and gently remove the carrier from the top shaft (arrowed below) then put it to one side. Oral-B toothbrushes are designed with dentists and are the number one toothbrush brand most used by dentists worldwide.
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