Switch Behavior; Led Behavior - Shure Microflex MX300 Series User Manual

tainer screw, the grille retainer, foam screen, and grille, as shown
in Figure 2 on page 21.

SWITCH BEHAVIOR

Push to Mute, Release to Talk (As Shipped) LED on when microphone is active
Push to Talk, Release to Mute
Toggle: Push On/Push Off
Microphone Always Active (switch available
for logic functions only)
NOTE: S4 is available for custom applications. When S4 is in
the ON position, pad W4 is connected to pad W5 (see Figure 10 on
page 23).
MX392 LOGIC TERMINAL DEFINITIONS
(Figure 6 on page 22)
LOGIC GND Terminal: Connects to the logic ground of an au-
tomatic mixer, switcher, or other equipment. Can be modified to
prevent ground loops.
SWITCH OUT Terminal: Provides a TTL logic low when the
membrane switch is pressed. This signal is available at all times for
all switch settings. The Switch Out function provides a momentary
closure when S1 is Off and a latching closure when S1 is On.
LED IN Terminal: Can be modified to remotely control the LED
by flipping DIP switch S3 in the microphone to the ON position. As
supplied, the LED IN terminal draws 5 Vdc. When this is shorted to
the LOGIC GROUND terminal, the LED turns on.
SWITCH BEHAVIOR
Switch Deactivated,
Microphone Always Active
Automatic Mixer Mode (MX392 models only) Connect SWITCH OUT signal to various logic in-

LED BEHAVIOR

LED on when microphone is active
LED on when microphone is active
LED Always OFF
MX392 LOGIC MODIFICATIONS
Open the microphone as shown in Figure 2 on page 21.
Isolating Logic Ground from Audio Ground
1. Remove jumper R40 from the top of the circuit board.
2. Make sure LOGIC GND terminal connects to the logic
ground of the automatic mixer, switcher, or other equip-
ment.
Changing SWITCH OUT Terminal to Always Momentary
To accommodate interface equipment requiring momentary clo-
sure of the microphone (even when the desired microphone func-
tion is latching on/off), proceed as follows:
1. Remove R45 from the top of the circuit board.
Reinstall R45 at location R46 on the top of the circuit
2.
board
USER ACTION REQUIRED
Short LED IN terminal to LOGIC GROUND terminal
LED Always ON
puts of automatic mixer for custom functions
Connect mixer channel GATE OUT to microphone
LED IN. LED on microphone turns on when its
channel is gated on
3
DIP SWITCH SETTINGS
Initially Muted Initially Active
DIP SWITCH SETTINGS
Switch out is logic Switch toggles
low while switch is switch out to
pressed logic low