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The microcontroller will also change the state of the mute if the monitor button is depressed (SW402), assuming that this function has been enabled in the programming Pin 13 is connected to Q414, Q415 via R446, which mutes the TDA7233IC. DETAILED FUNCTIONAL DESCRIPTION Issue 1.0 Page 5-4 03/01 SP200/210 Maxon SP200/210 Radio Battery Low Indicator Circuit When the battery voltage drops below 5.6 VDC a Battery Low indication is given. Due to the volts drop across D403, a voltage below 5.6V on the