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Also check for surface-mount components near to your soldering work that might have moved off their pads. making it extremely hard to connect both to the circuit board.). Great thing! It was then easy to fold back the half width and cut it off without danger of cutting right across.

Thanks for the tips about the desoldering pump and scalpel blade Ian. Maybe there is a way to bypass it? I cut the solder tags off the original battery and soldered onto the tags on new battery to get the right profiles and bends, this is a bit fiddley but worked well for me. Most interesting Guides & Blog, will come in very handy soon. Hi Kim, great to hear about your successful repair! As considerable force is required to cut out the battery carrier to take the larger battery this is easily done be warned! I did leave the toothbrush on the charger for 24 hours but no joy. Privacy I`m guessing that the element responsible for checking battery capacity is damaged. Hi Ash, Putting it on the charger for 10 seconds will normally reset the brush to accept the new battery. There could be some debris rubbing inside the gearbox, or the frame might be twisted slightly. I dont know how. Healthcare4all are medical equipment suppliers in the UK, specialising in respiratory products such as nebuliser machines and pulse oximeters, for conditions such as COPD and asthma. Luckily there was still enough remaining length of terminal to try again and this time I easily cut from the end along the centre. The red charging light flashes when I press the ON switch. JavaScript seems to be disabled in your browser. Saved another toothbrush here, thanks so much for the guide! Fantastic instructions and replacement batteries I have just done my third one thank you for your help.

Well done. The Professional Care 3000 rechargeable toothbrush has a waterproof handle, is electrically safe and is designed for use in the bathroom Many thanks guys. All I get is the flashing red light when the power switch is pressed. West Sussex Makes a pointless hole requiring a tiny bit of Araldite or the wet stuff will get in. Fantastic. Brilliantly clear and comprehensive instructions. I cut away the plastic tabs of the battery holder with the small blade of a Swiss Army knife. Youre right that theyre not part of the induction charging circuit.

Was so fortunate to find this tutorial and incredibly well-done instructions. It seemed a daunting task to replace the battery. Toothbrush now with big battery installed and charging! Carefully inspect all around each solder joint with a magnifier to look for soldering issues and re-solder any joints that look cracked. this time absolutely remembering the correct battery polarity!

If too much pressure is applied, the oscillating movement of the brush head will continue but the pulsation will stop. Sometimes it takes up to an hour before the toothbrush even acknowledges that its charging! Hi! I got the longer battery and modified the plastic cage. Just keep that in mind on the tabs for the replacement battery. The only fiddly part of the guide was avoiding melting the plastic posts on the pressure warning light cradle. I have checked the soldered joints and they appear OK.

Note on pressure warning light connections: Also, following one of the videos, I did not de-solder the pressure warning light connections and so while handling to remove the battery, the wire got cut. To cut the story short, now it wont charge and the charging red light is blinking very fast. Many Thanks. Battery indicator blinks even if It has enough power for 2-3 days.

I re solder, now red light blinking only when I press the power button. A further charge (another 12 hours plus) didnt help and it now goes flat almost immediately. The problem is that after charging for +8 hours the brush does spin for a couple of seconds and then red light shows up indicating that the battery is flat and it dies. Hi. Hi.

You do not need to remove the charging coil from the board. This brush does NOT have a pressure switch. great guide!

We have details of batteries for the Sonicare Airfloss here. My brush just died today while using. Unfortunately i`m stuck (probably messed up something on PCB. Desoldering braid might also be useful for this. The brush is now on charge after fitting the larger battery, all seems to work as it should and Im looking forward to fitting the other replacement battery to my wifes brush as she made me fit mine first. I removed the (desoldered) the pressure warning switch and turned the brush on, no change. However, its more likely with yours that one of the charging coil wires has come off. , Or maybe this is a known issue and the solution is simple but I`m missing it? Dont worry if this breaks off as we can use glue at reassembly time. I replaced the battery and the battery indicator blinks green when charging. Enjoy cleaning it all before eventually poking it back in your gob. I replaced the battery of my 3756 two years ago, and breathed a whole new lease of life into it. Thank you for the excellent guide. I was stumped for awhile Can you meet before with this kind of problem? light off for a few seconds, red light for half second or so, then off for few seconds repeatedly). Thanks again! until even the red pressure sensor light has no power to flash anymore). Run through all our troubleshooting tips as this is likely to be a short or a broken coil wire. Hi It seems to charge normally, with the light turning off upon charge completion. It just stopped charging. So Im very happy with my first attempt. And just to be complete attempts to re-charge when the motor has no more energy to move (but pressure sensing light still flashing) will allow the battery to become charged a little. They are a different voltage and they need different charging circuitry to recharge them correctly. This makes it more difficult for the toothbrush to be repaired (see below.). Do you know what causes this? Many thanks! The Professional Care 3000 rechargeable toothbrush has a waterproof handle, is electrically safe and is designed for use in the bathroom. The new battery had enough power to run the motor so I know the batter was soldered on properly. Thx. That was the best of instructions. Alternatively, you can remove the pressure switch and just live with the light being on (when the brush is running.). Another one saved from the landfill! But interestingly, once the toothbush is turned on, the unit would behave normally no flashing pressure sensor light when normally operating the motor. I appreciate the quick shipping to the USA and will be purchasing another battery for an older model we have sitting around. Hi I am very grateful to your suggestion at using a 11mm spanner to push top clip down I was worried I couldnt get it on correctly. Any damage to yourself, your toothbrush or anything else is entirely your responsibility.

Its not like welding or brazing!

Thank you for an excellent battery replacement guide. Do you think this is related to the battery? Oh . Hardest part was getting the bottom off after that the instructions were clear and easy to follow. Just wanted to say thank you for the guide.

I purchased a battery from you for my 3756. This is clipped in on both sides at the top of the brush, see the arrows below.

Very clear instructions.thank you. Happy brushing! Great stuff.

So, I would suggest to de-solder the pressure warning light connections.

Thanks again! Works a treat now, thanks!!!

Take a look at the picture below to see how the positive tag extends through some empty space inside the handle. There could be a short circuit somewhere on the PCB caused by a stray blob or whisker of solder. Thanks for providing this great guide. Same plus mole grips for the top seal first, of course. One thing: if desoldering the wires for the pressure warning light, the wire is melting the plastic where it is winded up. Its not the charger as another brush will charge on it. Just replaced the battery in our 2 toothbrushes. Some times I can only get one or two, 2 minute brushing sessions. Great to hear you got your toothbrush repaired and working again Rick! Thanks again! Rob.

I have since bought one for a couple of pounds. The first piece to remove from the internal assembly is the power switch plate. There is probably a reciprocating arm that has been disconnected from a cam. Hi Daniel, This is a reliability factor the bends in the solder tags are to prevent the vibration of the toothbrush from breaking the solder joints or lifting the solder pad off the PCB. I must have a hundred solder balls all over my work area trying to get them to adhere to the area nicely. Soldered it back on and good as new. And sure enough the new one still flashing green a day later. Didnt charge. Hi, check your solder connections for the battery in case one has cracked or come loose. Everything looks okay and I dont know where I did the mistake. What are the general best practices to do with this kind of battery? So, I checked the troubleshooting guide (this helped too) and reopened to check the soldering points.

We had one snag, the two copper wires on the side broke but I think they were long enough to solder back on. Can it be I have pried loose the contact for the battery to the coil? Similarly, the amount of solder applied should be minimal as components are closely spaced and short circuits must be avoided. I got my toothbrush back together. Then unclip the switch and put it to one side.

-Thanks again! Brilliant instructions however the flashing Red Battery Flat is flashing, but no green charge light when plugged in. Excellent instructions, just replaced 2 toothbrush batteries. Thank you for this great guide! The red charge indicator light starts blinking when the rechargeable battery is low. Id suggest re-fitting the old battery and checking for shorts on the PCB a common one is the pressure sensor switch (if fitted) connection touching the positive battery connection. I think the thing I enjoyed most (other than restoring my toothbrush to working order) was the feeling of fighting back against that damned planned obsolescence! Down with planned obsolescence! The charger works with another brush. The issue was during charging, the pressure sensor light would flash (as mentioned), and the green charge light would flash normally indicating charging. God bless you! Another brush successfully revived! A brilliant, clear set of instructions that made the job very easy to complete. Second was fitting the top ring back into its hole the rubber-like surface of the tootubrush is anything but slippery, the ring just refused to go back in there. But finally I was able to proceed as instructed. Jan. I just replaced both of ours and they now work just fine. I can add a few pointers to the very easy-to-follow instructions. We need more repair articles like this, very useful thanks! Very pleased with the result thank you again & keep up the good work. If you feel carefully, about 5-6mm up from the seam, below the plug indicator, you can feel the hole the securing lug snaps into. You can also try leaving it running until it shuts off then give it a full 24 hour charge. This is almost exactly the same as the old battery was doing. Faster than the original green blinking when it charges. is the way one solders the thin copper wires of the pressure device important? Glad the toothbrush repair went well Brian! It charges and turns on but the pressure sensor light is always on. The battery voltage looks good so if it wont run then it sounds like a problem with components on the board. about 0.5seconds on, then 1 second off. Ive just got my battery, Im going to replace it this week. Many thanks for the excellent guide and replacement battery. Does this indicate that this battery needs replacement? Finally, remove the battery from the toothbrush. Tad off subject but tried similar refit to a Philips QT3310 beard trimmer. Nestor. Took about one and a half hours but I can see that second time around about 30 minutes should be plenty. An excellent and detailed set of instructions. Only when pausing longer than 30 seconds the timer resets to the initial starting point. Dont be fooled by the PCB +ve legend, the Battery +ve tab goes to the MOTOR end.

Hi Asle, there might be a short-circuit caused by a stray blob of solder. Are you able to measure the voltage of the battery? It still works of course but I am wondering if original plus two long replacements is a fair life for one of these. Many thanks Ionic. This guide is for educational purposes only and is offered without guarantee or liability. Replaced the battery with long life version. John.

I will do this also in our Repaircafe!!! Thanks for the tip about battery polarity. I did replace the battery as per instruction which are great Think Ill give repair a miss. You can try reassembling without the pressure switch and warning light, but Im not sure if the motor will still run at full speed as the brush will be in a permanent state of pressure switch activated as the switch is a normally closed type. Basically it works but my wife cant stand the flashing and told me she will buy a new one. Also check for components that have moved on the PCB. However, I have been unable to get the toothbrush to go into charging mode.

I agree with the other comments a solder pump was much easier to use than desolder wick. So if any intrepid souls get everything to work but are stumped by motor straining (but failing) to turn the cam / linkage, hopefully this may help. Regarding the red light, once the battery is fully run down and recharged the internal battery-meter should re-sync and this will stop happening.

Note that the ring is stepped so you might need to press down into the soft coloured surrounding material to lever the ring from underneath.

Can there be a short circut under the PCB where the + battery strip is folded? Does the replacement battery has memory? After opening it up, manually moving the plastic cogs and lubricating with some light bicycle oil, I got it working again. Skip to the beginning of the images gallery, Braun Oral-B Professional Care 3000 3 Mode Electric Toothbrush. It looks a daunting task but actually it is quite easy.

Before it showed 1.3V after it shows 1,45V.

Hi John, great to hear the instructions were useful. Lucien. Happy brushing! However, the only thing I got is the red light blinking. Ionic is providing a valuable service to consumers and the environment THANKS! Your Brush FAQ rattled the brain cell last used a lifetime ago sorting out Motorola walkytalky NiCad packs & poor capacity, memory effect. Hi. Hi, I have the same problem after replacement it works but flashes red and is not charging. Even though there are now battery low warnings. I replaced the battery with the longer battery. Braun Oral-B Professional Care Type 3754 & 3756 Battery Replacement, Philips Sonicare DiamondClean HX9300 series, Sonicare Toothbrush Spare Parts & Chargers. Better than buying new toothbrushes, ha? Glad the guide was useful . At first, the battery charged then very quickly the charge went dead. Jane, Thanks Jane, Im glad you got your brush up and running again. Replacement battery delivered very quickly and is not to expensive. Kim.

Have a look through our troubleshooting tips here. Features 3 modes: Daily Clean, Sensitive Clean, Polish Mode. In case you still have another solution, feel free to post.

Powered the motor with the battery via jump leads and still no joy. I was just wondering what the spring in the base of the toothbrush is for. It went back together properly anyway. Using my meter I was easily able to identify the correct polarity and connected it up correctly. Are you able to charge it for 24 hours then measure the battery voltage at the PCB terminals with a voltmeter/multimeter? I dont see any loose components on the pcb, but I checked and the two pins to the motor are short circuited, and this seems weird, shouldnt the other one be plus, the other one ground? But thats no problem, because they are placed where they have been and that should be no problem Any ideas? I have replaced batteries in a previous generation of Braun toothbrushes but there are enough differences for this site to be really useful. Once I fixed it, I see the charging light is blinking but it is not working, not even the red light. When soldering make sure you burn the clear insulation coating off the wire to get a good connection. Is it just intended to support the battery and therefore is not really vital or does it serve another purpose? I last did soldering of printed circuit boards when I was 18 (now 70!). Any act carried out by yourself is entirely at your own risk. The pressure led is working only if the battery is fully charged. That is, when trimming down the replacement battery tab to make it narrower, you should use scissors. I found it a bit fiddly but I did the upgrade to larger battery and it all worked first time. I have successfully changed the battery and the tooth brush now functions just like new. I desolderd the pressure sensor, but it kept blinking (when brush was off).

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