User manual

17General operating notices
First connect the charger cable’s banana plugs
to the charger and only then connect the cable’s
other end into the charging jack on the transmit-
ter. Never allow the bare ends of the banana plugs
to come into contact with one another when the
other end of the cable is plugged into the trans-
mitter.
Charging current may not exceed 1.5 A as other-
wise the diode, and perhaps other components,
could be damaged. If necessary, limit the current
at the charger.
mc-charging jack polarity
The charger cables on the market from other manu-
facturers often have different polarities. Therefore use
only an original Graupner charger cable, order no.
3022.
Removing the transmitter’s battery
To remove the transmitter battery locate the cover of
the battery compartment in the back of the transmitter
and slide it off in the direction of the arrow:
Battery connector
Lift one side of the battery and withdraw it from the
hook-and-loop tape without using force. Then discon-
nect the transmitter battery’s connector by carefully
pulling on the supply line cable.
(The photo shows the battery of the
mc-20 HoTT
transmitter.)
Inserting the transmitter’s battery
The battery connector is protected against a reverse
polarity connection by two slanted edges, see illustra-
tion. When correctly plugged in, the
unconnected pin of the connector
is at the bottom, as shown in the
illustration. The plus pole (red lead)
is in the middle and the minus pole
(brown or black lead) is toward the
antenna side.
Never try to force the connector onto its circuit-board
socket.
Place the battery into its compartment and close the
transmitter’s cover.
Battery operation timer at the bottom left of the
screen
This timer shows the transmitter’s cumulative op-
erating time since the transmitter’s battery was last
charged.
This timer is automatically reset to “0:00” when the
transmitter is switched on and its battery voltage is
significantly higher than when the transmitter was last
used, e. g. because the battery was charged.
#01
0:00h
Stp
Flt
0:00
0:00
0.0V
4.1V
Mx
HoTT
Transmitter
connector polarity
General charging notices
• The charging instructions for the charger as well
as for the battery from its manufacturer to be
observed.
• Pay attention to the maximum permissible charg-
ing current specified by the battery’s manufacturer.
In order to prevent damage to the transmitter,
charging current should never exceed 1 A. If nec-
essary, limit the current at the charger.
• If the transmitter battery is nevertheless to be
charged at a current rate in excess of 1 A, then it is
imperative that this is done outside the transmitter.
Otherwise there is a risk of damage to the trans-
mitter’s board due to overloading its printed circuit
paths and/or overheating of the battery.
• If an automatic charger is to be used for charg-
ing, perform several test charging procedures to
ensure the flawless functionality of its automatic
shut-off. This applies particularly if you want to
charge the standard installed Lithium battery with
an automatic charger unit. You may need to alter
the charger’s cut-off behaviour if the charger you
are using offers this option.
• Do not execute a battery discharge or battery
maintenance program through the charger jack.
The charger jack is not suitable for this purpose.
• Always connect the charger cable to the charger
first and then to the receiver or transmitter battery.
This avoids the possibility of shorting the bare
banana plug ends together.
• If the battery heats up significantly, check the bat-
tery’s condition, replace the battery or reduce the
charging current.
• Never leave a charging battery unattended.
• Follow the safety notices and handling instruc-
tions provided on page 8.