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The only fiddly part of the guide was avoiding melting the plastic posts on the pressure warning light cradle. Thanks for the tip Barry! If it is damp inside let the insides dry out for 24 hours then reassemble and test. So, I checked the troubleshooting guide (this helped too) and reopened to check the soldering points.

The second one took about 15 minutes including cutting away for the larger battery. braun vguc There could be some debris rubbing inside the gearbox, or the frame might be twisted slightly. Now the pressure warning light flashes during charging as the charging light also do. Thank you! I melted some plastic during desoldering, but other than that, all went well.

Hi there! Another toothbrush saved from the landfill! Good point about the repairability of battery-powered devices. Unfortunately my rusty soldering skills melted the plastics holding the pressure warning light wires. I can trigger the motor if I hold the battery so that one pin touches the motor outing and one pin touches one of the motor pins So I guess I either I heated something up or there is an excess of lead/tin somewhere.

The guide is perfect and describes all the necessary details.

Bravo! Ive had it on charge for about 16 hours now and its still the same. Very bad. Plug the charging unit into an electrical outlet and place the toothbrush handle on the charging unit. Does this on and off charging and if left on the charger over night. I would however suggest the better way to trim the new battery terminals would be to cut down the width from the end before cutting across, as indicated in the guide. Any thoughts? Before this I checked the battery voltage on the tooth brush at full charge (1.386V) and when empty (red light, 1.232V). I bought a new longer version from yourselves and installed it according to your excellent instructions. Great instructions.

Regarding the motor, youll need to open up the handle and look at the gear linkages. Ma dopo aver seguito le istruzioni passo passo , ed aver rimontato il tutto non si accende la luce della ricarica. Thanks for those recommendations! The motor seems to slow down when I apply pressure, though.

Otherwise, theyre no better than the original Mini, where the engine must be removed to replace the fan belt (and shockingly, the Mini actually won major design awards duh). As youve found, the key to opening many appliances is finding the hidden plastic clips. I lost one but the other was fine.

. Took about one and a half hours but I can see that second time around about 30 minutes should be plenty. Using my meter I was easily able to identify the correct polarity and connected it up correctly. Hi Ash, Putting it on the charger for 10 seconds will normally reset the brush to accept the new battery. My calendar shows the toothbrush battery capacity is headed south, a couple of days less per month & now >24hrs to recharge each time. I tried that couple of times.

Somehow the charging mechanism doesnt work after reassembly. My only suggestion re your instructions would be to tell the erstwhile repairer not to worry about the plastic lugs at the end of the wires from the coil nothing needs doing re these! I have thrown away two brushes in the past, but no more! Hi Jon, when you press the button do you get a red flashing light? With the pressure switch removed the light will stay on all the time, so check that the top end of the pressure switch is clipped correctly in place. I had to triple check my soldering in various spots because there seemed to be brown greasy stuff left from the old solder i was using and more than likely my very old corroded iron which has seen better days.

Hi Hanno, Glad to hear you found what was causing the problem. However, the only thing I got is the red light blinking. And its working again! Are you able to put a drop of oil on the motor bearings?

So thats a big improvement.

Hardest bit is getting the case apart, there are two major clips 40mm up from the USB socket to free, a plastic guitar pick is essential. The brush is now in the charger and it is blinking green. 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. All charged up over night and working fine today, thank you.

Double check them, i used a small screwdriver to try and move the metal tabs to see if they will move after working on them.

Thats how its designed to come apart!

Ill test it! We need more repair articles like this, very useful thanks! Thanks again! Thanks very much Ionic. Thanks again! Tad off subject but tried similar refit to a Philips QT3310 beard trimmer. Cheers all. Dont try to solder metal tabs directly to the battery as the heat can damage the battery internally, reducing its capacity and lifespan.

This website use cookies to ensure you get the best user experience on our website. Please support us with writing these repair guides by buying your replacement battery through the links to our secure online shop shown. The tutorial is based on the Type 3756 toothbrush but also applies to Type 3754 toothbrushes. If I then leave the toothbrush on the charger under this condition, then the pressure sensor light wont flash during the charging process, and the battery is also (interestingly) able to reach fully charge.

I thought it just a no battery symptoms but when I put it on charging dork, no light what so ever. Push there with a small screwdriver or the like while pulling back in the charger. This will allow the toothbrush to be used for a week or so until charge runs out again.

I charge at full and lasted 10 days again, with the same battery, but the second cycle lasted 2 The toothbrush doesnt allow to charge the battery fully if you dont disconnect it from the circuit. I also used de-soldering braid to remove solder. That is, when trimming down the replacement battery tab to make it narrower, you should use scissors.

I followed the instructions and cut across first, this required enough scissor pressure to start the cut which then cut right across.

It needed heating up and rubbing with cloth to clean.

I cut away the plastic tabs of the battery holder with the small blade of a Swiss Army knife. For me it was not an easy job, but my toothbrush is running nicely again. Having put it back together I have no parts left over and the charging light is flashing.

Its so important to make this straightforward for end-users! Thanks a lot for this excellent initiative and website to fight reckless consumerism ! One was oriented upwards, the other downwards. Didnt see any other comments regarding battery charging protocol, so I checked while disassembled: Average charge current is about 90 mA; the highest voltage I saw while charging was about 1.5V; and the discharge cutoff voltage (under load) was slightly above 1.0 V. So, I guess we cant blame the charging regimen for the apparent shortened battery life, unless someone with an updated battery has other data. So chuffed was I, that I bought another from you a fortnight ago, and Ive just done, unknown to her, the wifes, green LED happily blinking away. Hi. Hi. The instructions are excellent; very clear and detailed. Is there a way of resetting the intelligent battery meter? Please add any of your own guidelines. Soldering is quite safe. Also run through the checks on our Customer Support page.

So important to keep it watertight. Did the replacement regarding the instruction.

After an hour it can be used. I have checked all the usual things: coil connections and continuity (1.4 Ohms), motor connections (I checked it ran from a battery across its terminals when disassembled), no solder splashes. Im too stubborn and cheap to purchase new toothbrushes, so I replaced batteries with the larger 49mm NiMH on Oral B 3000/3756 series brushes and they work like new now!

Toothbrush now with big battery installed and charging! My 1st time trying to fix a gadget, helped by a friend with a solder iron. Great work repairing your toothbrushes James! Many thanks for this excellent guide. Id appreciate any ideas you may have! Even the pressure sensor seem to work: The light flashes when a certain pressure is detected and is permanently on when the pressure get even higher. Initially, I did everything per the steps (except de-soldering the pressure warning light connections, also followed a video). Anyway. You do not need to remove the charging coil from the board. Eg. The motor is moving the gear from side to side but Im not getting any movement above that. Hi.

Thanks . And the pressure sensor light works when we apply too much pressure. Good idea to oil it like you did.

Last time I modified the case to take the longer battery, which was easily undertaken with a small drilling/modification tool: eg. The original battery did last longer than this one and this one is the larger of the two. You can try leaving it running continuously with no head attached after oiling both ends of the motor shaft, to see if that helps. So, I will watch out for it after a complete discharge.

But still not charging & no light. Very informative and with precise instructions took me just 20 minutes. Ill have to fork out for a new one. I also used the scissors on the knife to trim the battery tabs. The red charge indicator light starts blinking when the rechargeable battery is low.

The ability to modify the toothbrush to take a higher capacity battery is brilliant too and quite easy. If the pressure sensor light is permanently on there is probably a short circuit somewhere. Happy brushing! However, when I put it on the base to charge, it has a faster green blinking pattern. Great, made it look so simple and it was. When the brush is switched off the pressure sensor warning light flashes every 3seconds for about half a second. Good to know it works before reassembly. it worked. Ionic is providing a valuable service to consumers and the environment THANKS! Should it persist after two weeks, please consult your dentist or hygienist. Both timers memorise the elapsed brushing time, even when the handle is briefly switched off during brushing. Just wanted to say thanks for the clear guide, and all went very smoothly, including the upgrade to a higher capacity battery. Youre right that theyre not part of the induction charging circuit. I did managed to do the battery replacement. Excellent instructions, just replaced 2 toothbrush batteries. Thank you! I now have an almost new toothbrush with an elongated battery life! Thanks again for an excellent site and for the help given. The Professional Care 3000 rechargeable toothbrush has a waterproof handle, is electrically safe and is designed for use in the bathroom. I think if you were careful, the board and coil could come out together? Almost as though it does not turn off when switched off. Thanks for the help!

hydrogen) given off by the battery in the rare situation that it over charges. We have details of batteries for the Sonicare Airfloss here. That was the best of instructions. The Professional Care 3000 rechargeable toothbrush has a waterproof handle, is electrically safe and is designed for use in the bathroom. Your enemies are years of old toothpaste gunge & a dull brain cell. I have tried discharging the battery completely and recharging it. I found the plastic of the battery holder to be harder than I expected and, although I removed most of the webs with a scalpel, I found a Dremel was good at removing the last pieces. On a slightly more serious note, I de-soldered from the PCB in the order of, charge coil, neg battery terminal, pressure sensor LED, motor terminals, pressure sensor, pos battery terminal. After its fully charged, if it wont switch on put it back on the charger for 5 seconds and take it off again.

I have an professional care braun oral-b type 3767 brush. Good morning. Since its not that important, im just going to desolder the connection to the light. This brush does NOT have a pressure switch.

Check the two joints where the batterys solder tags are soldered to the PCB. Thanks for the guide! Inspect the PCB for water damage too (corrosion, staining, crystal formation). How I managed it I have no idea because the photos clearly show the orientation. There are plenty of tutorials on Youtube. Thanks for the great guide. You can use the very tip of the scissors to snip in part of the way but this relies on the scissor blades being sharp enough and tight enough! It will not charge. This is clipped in on both sides at the top of the brush, see the arrows below. Soldering and de soldering frightens me to death. Also useful, a big blob of blu-tak to bed the chassis when soldering. My most recent repair for a Braun 3754, upon successful battery change the charge light blinks five times on button press but the motor wont run. But interestingly, once the toothbush is turned on, the unit would behave normally no flashing pressure sensor light when normally operating the motor. An excellent and detailed set of instructions. The green charge indicator light flashes while the handle is being charged, and when the handle is fully charged the green charge indicator light shines continuously.

Cheers, the tags on my battery were long enough, even with the bends so I am happy I kept the bends. For me, this was necessary as when I first replaced the battery, it still didnt work, but after cleaning off the accumulated crud, it did, so I guess the crud was shorting out between pins of the chip. Excellent instructions, thank you. I checked the replacement battery was between these limits (it was 1.271V) before fitting. I partially discharged the new battery externally to see if that would help again, no joy. To start off, remove any brush heads from the top of the handle. Hi, Thank you for guide. Great to hear about another successful repair . However! 5 to 10 hours of charging under this condition would allow the motor to turn again for maybe 1 minute of usage only, before running out of juice. Thanks for the interesting measurements Robert! Now it has a fast on, slow off.

Maybe there is a way to bypass it? Thanks for that reply Ionic not sure the oil & grease point are in the main instructions?

However, the charging would not allow for a full charge. Thats when I would have to allow uninterrupted charging.

Nothing at all.

I did as instructed, however as soon as I put the brush to charge, there is a permanent flashing of the red light on it (the battery indicator) even after waiting more than an hour. Do you have any idea why it is happening? When you press the power button, you can hear and feel the motor try to start for one brief surge, but then nothing else but a flashing red light. Brilliant instructions very clear have now done 2 toothbrushes both currently on charge. Hardest part was getting the bottom off after that the instructions were clear and easy to follow. I was stumped for awhile Do you know what causes this? 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. However, I did not buy a solder pump and struggled to remove the solder!

On the one not working, it appears to charge correctly with the flashing green light. Hi, what an awesome guide! :-). scalpel, snap-off, retractable or Stanley type, Small flat-bladed screwdriver: 2 to 4mm wide, 10-11mm ring spanner or tool with similar sized hole, Instant glue (e.g. It was then easy to fold back the half width and cut it off without danger of cutting right across.

You dont actually need to put the bottom in hot water. During the time I was fixing it, by manually spinning the plastic cogs, the motor seemed to warm up quite a bit.

In the end it got a little messy since I had repaired the solder joints twice and added extra battery solder, but the toothbrush works as good as new! Because it is physically larger, a longer battery will have a higher electrical capacity (mAh) and will run for longer between recharges. Which one on the PCB is that?

Lucien. However, I have just de soldered everything and re soldered all the connections and put it on charge again to reset it on its now operating ok.

I found removing the base & retaining ring easy. No problems at all, just takes a bit of time as it was the first time. Desolder wick dead handy, I used Loctite NC-BB. I just finished installing your longer battery into our 3756. Great to hear you got your toothbrush repaired and working again Rick!

We have published some toothbrush care advice on our website.

Im happy to say my toothbrush is now back to full function. The original symptom was flashing red light (pressure sensor light flashing eg. I tried the battery replacement in one of my Braun 3756s some time back and it didnt work, even though everything looks OK. Today I did the second of the pair and this one appears to be working fine.

Alternatively, you can remove the pressure switch and just live with the light being on (when the brush is running.).

1. The brush should now run as normal. Using the screwdriver carefully press in on the white clips on both sides (one arrowed below) which hold the black coil support in place and unclip the coil, putting it to one side. Get all the latest information on Events, Sales and Offers.Sign up for newsletter today. Apart from that, as long as the brush charges and runs okay this is nothing to worry about.

(Has anyone ever opened the metal frame that holds the motor and cam drive assembly? Hi, check your solder connections for the battery in case one has cracked or come loose. The only thing thats not working is the pressure warning LED, which stays always-off. Everything went according to plan and I am now getting the full use of the higher capacity battery. No matter. run the toothbrush until it stops, put it on charge for 10 seconds, run it until it stops, charge it for 10 seconds, and so on until it will no longer run.

After 24 hours both lights are still flashing. Any top tips as it all seems to have been reconnected in the reverse of the deconnection sequence.

In which case, I would need to allow the battery to fully drain away (ie. I invested in a small soldering iron and there was no holding me back; one toothbrush now up and running again. Hope the second toothbrush repair goes well too. It will probable run for a 1 1/2 days (3 cleanings) then its dead for the next one! But what I have noticed is if I completely drain the battery so that even the pressure sensor light has no more power to flash, then I am able to put the toothbrush on the charger.

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