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Thursday, September 19, 2013

[appliance-repair] Digest Number 2320

2 New Messages

Digest #2320
1a
Re: Braun Sonic toothbrush by graham_comptonuk
1b
Re: Braun Sonic toothbrush by "KeepIt SimpleStupid" KeepItSimpleStupid

Messages

Wed Sep 18, 2013 6:06 am (PDT) . Posted by:

graham_comptonuk


If anyone is interested after all this time:

I bought another and that has just become unusable because of the
dying battery. I guess 4 or 5 years isn't too bad. This time,
however, when I replaced the battery I first connected an
external battery so that the circuit did not suffer a loss of
power. The process was a success and the toothbrush works fine.

So, did I mess up and damage the first one, or is the program in
the microcontroller designed to require some sort of external
start-up I wonder? Evidence for the latter is that the charging
function still worked on the first repair. On the other hand I
have seen a PIC that worked fine until you accessed a particular
port and then it went into a high current sulk until a reset, so
individual bits can fail separately.


regards

Graham



--- In appliance-repair@yahoogroups.com,
<appliance-repair@yahoogroups.com> wrote:

Yes, I agreed, so I bought one.
Unfortunately there are Braun Sonic toothbrushes and then there
are
Braun Sonic toothbrushes.
The device I have gone back to trying to repair had quite a lot
of
power and drives a moving coil/magnet transducer with AC from an
"H"
bridge.
£14.99 buys a toy that buzzes. Listening to it, I suspect
it's a
small electric motor with an eccentric weight. It's not even a
pale
shadow of the expensive version. I'd heard dentists criticise
sonic
toothbrushes, and now I know why. The only excuse for it that I
can
see is that it may make tooth brushing more interesting for
children.
Philips also do a range, but I have no idea what they're like.
I'm a
bit off throwing good money after bad though.
Back to the soldering iron.
regards
Graham

--- In appliance-repair@yahoogroups.com
<mailto:appliance-repair@yahoogroups.com> , "Victor Stevens"
<victor.stevens@...> wrote:
>
> £14.99 'buy it now' on ebay - hardly worth the effort of
repairing
it, surely? After 3 years of use the motor and gears must be near
their end of life............

Wed Sep 18, 2013 9:07 am (PDT) . Posted by:

"KeepIt SimpleStupid" KeepItSimpleStupid

A lot of problems happen when the processor didnt get reset properly.  If you still have the old toothbrush, take the battery out and short the pins going to the toothbrush.  When connecting the battery, make sure it is done all at once without intermittant contact.

________________________________
From: "Graham.Compton@ntu.ac.uk" <Graham.Compton@ntu.ac.uk>
To: appliance-repair@yahoogroups.com
Sent: Wednesday, September 18, 2013 8:51 AM
Subject: [appliance-repair] RE: Re: Braun Sonic toothbrush


 
If anyone is interested after all this time:
I bought another and that has just become unusable because of the dying battery. I guess 4 or 5 years isn't too bad. This time, however, when I replaced the battery I first connected an external battery so that the circuit did not suffer a loss of power. The process was a success and the toothbrush works fine.
So, did I mess up and damage the first one, or is the program in the microcontroller designed to require some sort of external start-up I wonder? Evidence for the latter is that the charging function still worked on the first repair. On the other hand I have seen a PIC that worked fine until you accessed a particular port and then it went into a high current sulk until a reset, so individual bits can fail separately.

regards
Graham

--- In appliance-repair@yahoogroups.com, <appliance-repair@yahoogroups.com> wrote:

Yes, I agreed, so I bought one.
Unfortunately there are Braun Sonic toothbrushes and then there are
Braun Sonic toothbrushes.
The device I have gone back to trying to repair had quite a lot of
power and drives a moving coil/magnet transducer with AC from an "H"
bridge.
£14.99 buys a toy that buzzes. Listening to it, I suspect it's a
small electric motor with an eccentric weight. It's not even a pale
shadow of the expensive version. I'd heard dentists criticise sonic
toothbrushes, and now I know why. The only excuse for it that I can
see is that it may make tooth brushing more interesting for children.
Philips also do a range, but I have no idea what they're like. I'm a
bit off throwing good money after bad though.
Back to the soldering iron.
regards
Graham

--- In appliance-repair@yahoogroups.com, "Victor Stevens"
<victor.stevens@...> wrote:

>
>> £14.99 'buy it now' on ebay - hardly worth the effort of repairing
>it, surely? After 3 years of use the motor and gears must be near
their end of life............
We are making changes based on your feedback, Thank you !
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