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Check your pre-amplifier settings. There is a button along the bottom edge below the display, or possibly in the menu section, I don't remember now. The button will switch in attenuators and amplifiers.
Another item might be your RG Gain control, although this doesn't cause any beeps when used. It is easy to inadvertantly turn, reducing your received signal to almost zero.
You have to modify this radio to operate outside of the HAM bands. You will likely find the modification at www.mods.dk. This is a pretty common and easy modification for HAM radios. Your performance may not be as good as in the HAM bands.
You do this MOD at your own risk. If you are not licensed for operation on ANY frequency or band, you are not legally allowed to transmit. Heavy fines may be levied against you.
The Icom 756 Pro is a very expensive radio. If you bought one and it's not transmitting I really recommend taking it back. It could be anything from the mic, power supply, final transistors, board, anything really. It's going to need to be scoped and looked at in person.
The Heil "ICM" microphone is designed to be used with certain Icom brand ham radios. These have a 8-pin round plug. Describing the pinout to you will depend upon your perspective, whether you are looking at it from the microphone plug itself, or the microphone socket on the front of the radio. Therefore, from the perspective of looking at the mic plug on the end of the mic cable, note that there is a notch or dimple in the plug that also lines up with the screw. Going clockwise from the notch, the pins are numbered 1 thru 7. Pin #8 is the center pin.
Pin 1 = mic input
Pin 5 = Push-to-talk (PTT)
Pin 6 = PTT ground
Pin 7= Mic ground
From the standpoint of an Icom transceiver, the remainder of the mic connector pins are as follows:
pin 2 = +8 volts DC (output from the radio)
pin 3 = frequency control up/down
pin 4 = squelch switch
pin 8 = audio output (level varies w/vol control)
Hope this helps