Shure UC1L Service Manual page 7

Power Switch and Remote Mute Switch Interface
on U101, pin 19. The same signal is also forced low when a remote
mute switch closes the tip contact to the sleeve ground.
It immediately disables the tone key, and the power hold circuit auto-
matically kicks in to bypass the power switch. Followed by 500 msec.
of delay, the rf is muted and also turned off.
off condition, then the transmitter is shut off. Otherwise, it is the remote
mute condition, and the transmitter waits here for unmute to occur.
PWRDN1
to completely recover from the remote mute condition. When a remote
mute switch closes the ring contact to the sleeve ground, the
signal goes to a logic low that immediately mutes the audio.
25A1043 (RI)
Shure UC1 Body-Pack UHF Transmitter
When a transmitter is turned off, the
The microcontroller treats both of these events in a similar manner.
The power hold circuit is also disabled at this point. If it is the power
is pulled up back to logic high level when unmute occurs.
The rf section repowers and is unmuted, followed by tone key enable
7
signal goes to logic low
PWRDN1
TKMUTE1
Characteristics