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The control board that does the slides and landing gear etc? Usually they have a sync button on them.
Here are the instructions from my 3750FL
Programming Instructions: Each transmitter has its own unique internal address that is transmitted whenever a button on the transmitter is pressed. The receiver needs to be programmed to respond only to the transmitter it is intended to operate with. The following steps configure the receiver to operate with a particular transmitter. Please read the entire programming procedure before starting. Prior to programming the receiver, verify that the receiver is connected to the input power. When the receiver enters program mode, all previous transmitter addresses that were programmed will be erased from the receiver's memory.
1. Locate the pushbutton labeled "PROGRAM" on the receiver. Press and hold this button until the red LED next to the program button illuminates (approximately 3 seconds). The receiver is now in the transmitter program mode, release the program button. At this point all previously programmed transmitter addresses are erased from the receiver's memory.
2. Press and release any button on the transmitter and verify that the red LED on the receiver will blink rapidly, and then extinguish. The receiver is now in the normal mode of operation. Note: This sequence should be done quickly because once the program LED illuminates you only have a few seconds to push a switch on the transmitter before it times out. This completes the programming instructions. The receiver will retain the programming even when power is removed.
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