Het is inmiddels zo'n dikke 2 jaar later. Ik heb 3 TB's op het moment waarvan er 2 de verkoop in gaan, een andere staat al dikke anderhalf jaar bij Robin die er op het moment een Devilfish van maakt met de laatste updates zoals midi. Toen iemand mij vroeg naar de technische conditie van de apparaten werd ik ineens weer herinnerd aan het batterijen probleempje. Ik heb Robin gevraagd wat het eventueel kan zijn. Ik dacht ik post het ook even in mijn oude topic hier.
One possible cause is that many TB-303s have a rather flat piece of
metal for their positive battery contact and that this is between two
protruding pieces of plastic which are part of the lower half of the
case. Most modern batteries do not have a protruding positive contact,
so the two contacts do not touch. You will be able to see this clearly
by looking at the contacts to see if they touch. In principle you can
fix this by putting some folded alfoil between the two, but this would
not be reliable. The best way to fix it is to remove the bottom part of
the case by undoing the 7 screws, and then pull the contact out of the
case, bend it outwards somewhat, and push it back in place.
Another possible reason is corrosion on the positive contact - which you
would be able to see and clean off by some means, such as a file
followed by rubbing with a tissue soaked in water. You could probably
do this without removing the bottom part of the case.
Another possible reason is corrosion on the negative contact. You can
see this and clean it with a file once you have removed the bottom part
of the case.
It is also possible that wires have broken off the contacts, which you
will also be able to see if you open the machine up.
If you open it, be sure not to have static electricity on you: don't
wear plastic-soled shoes or probably even socks on carpet. Don't sit on
a plastic chair or one covered in synthetic material - assuming you are
wearing cotton. Always touch the machine at a place such as the CV and
Gate output sockets before actually touching any other part of the
machine, especially if you need to touch the circuit boards.
Cheers
-Robin
)
. Ik vind dit iets zeer merkwaardig en ben benieuwd naar het antwoord 
