ParkZone PKZ3980 - Manual (Page 10)

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Additional Binding Information
Prior to each flight, power on your transmitter and wait about
five seconds before you plug the flight battery into the receiver.
Doing this allows time for the transmitter to scan and secure two
open frequencies. If the flight battery is plugged in too quickly
and the link is missed, it may cause the receiver to inadvertently
enter bind mode. If this occurs simply leave the transmitter on,
then disconnect and reconnect the flight battery.
You must test the controls prior to the first flight to ensure
none of the servos, linkages or parts were damaged during
shipping and handling and that the controls function in the
correct directions.
Turn the transmitter on first and lower the throttle stick
completely. Then, plug the battery into the battery lead of the
receiver unit.
Note: The connectors on the battery and battery lead are
keyed to prevent reverse polarity connection. However,
if you force them together in the wrong orientation and
with the wrong polarity it is still possible to damage the
battery and/or receiver unit. To help further prevent a
reverse polarity connection, one side of the end cap
on the battery and the connector on the battery lead
of the receiver unit will have a red dot. The connectors
are oriented for a proper polarity connection when the
red dots are on the same side.
Control Test