Graupner Hendheld RC 2.4 GHz No. of channels: 6 33112 User Manual

14

Transmitter power supply
The 

mx-12 HoTT transmitter is fi tted as standard with 

a high-capacity rechargeable 4NH-2000 RX RTU Ni-MH 
battery (Order No. 2498.4FBEC) (specifi cation re-
served). When delivered, the standard rechargeable 
battery is not charged.
When you are using the transmitter you can monitor 
the battery voltage on the LCD screen. If the voltage of 
the transmitter battery falls below a certain point, you 
will hear an audible warning signal. The screen then 
displays a message reminding you that the transmitter 
battery needs to be recharged.

#01

0:22h

stop

0:00
0:00

0.0V

4.7V

HoTT

M

x

batter y

needs
charging!!

x

Always recharge the transmitter battery in good time. 
When you see this message, cease operations immedi-
ately and recharge the transmitter battery.

The rechargeable Ni-MH transmitter battery can be 
recharged with the battery charger (Order No. 33116.2) 
supplied in the set, using the charge socket located on 
the right-hand side of the transmitter. Leave the battery 
inside the transmitter for charging, to avoid premature 
damage to the internal battery socket.
As an approximate guideline a discharged battery 
should be charged for twelve hours at a current cor-
responding to one tenth of the capacity printed on the 
pack. If you are using the standard transmitter battery 
and the charger supplied in the set, this current is 

200 mA. 
The transmitter must be switched “OFF” for the whole 
period of the charge process. Never switch on the 
transmitter when it is still connected to the charger; even 
a very brief interruption in the process can cause the 
charge voltage to rise to the point where the transmitter 
is immediately damaged. For this reason check carefully 
that all connectors are secure, and are making really 
good contact.

Commercially available battery charge leads produced 
by other manufacturers are often made up with the op-
posite polarity. For this reason it is essential to use only 
the genuine Graupner charge lead, Order No. 3022.

Using automatic battery chargers
Although the standard transmitter charge socket is pro-
tected against reversed polarity, it is still possible to use 
suitable chargers to fast-charge the transmitter battery.
If possible, set the delta peak voltage difference of your 
fast charger to a value in the range 10 mV … 20 mV or 
equivalent, as described in the charger’s instructions; 
this ensures that it is suitable for fast-charging Ni-MH 
cells.
First connect the banana plugs on the charge lead 
to the charger, and only then connect the other end 
of the charge lead to the charge socket on the trans-
mitter. When the charge lead is connected to the 
transmitter, never allow the bare ends of the plugs to 
touch! To avoid damage to the transmitter, the charge 
current must never exceed 1 A. If necessary, limit the 
current on the charger itself.

To remove the transmitter battery, fi rst disengage the 
cover over the battery compartment on the back of the 
transmitter, then lift it off:

Remove the battery, then carefully pull on the power 
lead to disconnect the transmitter battery connector.

Hold the connector attached to the transmitter battery 
in such a way that the black or brown wire faces the 
aerial, and the unused socket of the battery connector 
is on the side facing the bottom, then push the battery 
connector onto the three pins projecting out of the inside 
of the transmitter, in the direction of the 
circuit board. (The battery connector is 
protected against reversed polarity by 
two chamfered edges; see illustration).
Finally place the battery in the com-
partment, and close the cover.

Polarity of 
transmitter battery 
connector