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INTERNAL DIP SWITCH FUNCTIONS (FIGURE 5)
All MX392 and MX393 models have internal DIP switches
that allow the user to change the behavior of the microphone
On/Off switch. To gain access to the logic terminals, remove
the grille retainer screw, the grille retainer, foam screen, and
grille, as shown in Figure 2.
SWITCH BEHAVIOR LED BEHAVIOR DIP SWITCH SETTINGS
Push to Mute, Release to Talk (As Shipped) LED on when microphone is active
Push to Talk, Release to Mute LED on when microphone is active
Toggle: Push On/Push Off LED on when microphone is active
Initially Muted
Initially Active
Microphone Always Active (switch avail-
able for logic functions only)
LED Always OFF
NOTE: S4 is available for custom applications. When S4
is in the ON position, pad W4 is connected to pad W5 (see
Figure 10).
MX392 LOGIC TERMINAL DE FINITIONS (Figure 6)
LOGIC GND Terminal: Connects to the logic ground ofan
automatic mixer,switcher, or other equipment. Can be modi-
fied 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 f unction pro-
vides a momentary closure when S1 is Off and a latching clo-
sure when S1 is On.
LEDINTerminal:Can be modified to remotely control t he
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.
MX392 LOGIC MODIFICATIONS
Open the microphone as shown in Figure 2.
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 momen-
tary closure of the microphone (even when the desired mi-
crophone function is latching on/off), proceed as follows:
1. Remove R45 from the top of the circuit board.
2. Reinstall R45 at location R46 on the top of the circuit
board.
SWITCH BEHAVIOR USER ACTION REQUIRED DIP SWITCH SETTINGS
Switch Deactivated, Microphone Always
Active
Short LED IN terminal to LOGIC GROUND termi-
nal
LED Always ON
Automatic Mixer Mode (MX392 models
only)
Connect SWITCH OUT signal to various logic in-
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
Switch out is
logic low while
switch is
pressed
Switch toggles
switch out to
logic low