The power connector has three pins, Pin1 7.2v In, Pin2 Gnd, and Pin3
Charger In. The 7.2v input has a reverse protection diode in series
with the input, which will drop the input voltage .6v less than your
internal battery is supplying. Nevertheless, Ecocharge makes an
external battery system, that they say is recommended by Tascam,
that supplies a nominal 6volts, so apparently it can work fine on
6volts. Make sure that you are connecting to the 7.2v pin and not
the charge pin.
I suspect that your external battery is either worn out, not charged
properly, or can not supply enough current to operate the machine.
You can determine this easily by measuring the battery terminal
voltage as you try to power on the machine.
For an external battery pack, you might consider one from Eco-
charge. They also make power adapter cables for the Tascam so you
don't have to chop up your power supply's cable.
The Eco-charge batteries for the Tascam DA-P1 are at:
--- In Syd Curtis <>
> Anyone out there with experience of this problem with a Tascam DA-
> Mine was first used mid-June 1999, and so is 4 years old. Doesn't
> use except in the May-August lyrebird breeding season, and not
much then in
> '01 and '02 because of the drought.
> 1. With the original internal nicad battery the Tascam refuses to
> 2. With the Tascam mains transformer plugged in it appears to work
> 3. With an external 7.2V rechargeable battery plugged into the
> takes power from the transformer, it switches on, but after about
> switches itself off again.
> The Tascam transformer when plugged in, either powers the recorder
> charges the internal nicad, depending on the position of a two-way
> A few days ago it recharged the completely discharged nicad.
> The plug on the transformer is a peculiar Tascam plug, and not
> as far as I have been able to ascertain. In order to be able to
> external batteries to back up the internal one for use in the
field, I had
> to cut the lead from the transformer and fit plugs so that I can
> either the transformer or an external battery.
> I am mystified as to why the Tascam will work with current from the
> transformer, but not from the battery, going in via the same lead
> On Monday a Musiclab electronics expert will look at it. (I
hope.) But if
> anyone has experienced this problem and can give advice, it might
> time - and me, dollars.
> Syd Curtis in Brisbane, Australia.