INTERNAL DIP SWITCH FUNCTIONS (FIGURE 5)
All MX392 and MX393 models have internal DIP switches that allow the user to program the On/Off switch so that it fits the application. To gain access to the DIP switches, remove the grille retainer screw, the grille retainer, the foam screen, and the grille, as shown in Figure 2.
MX392 LOGIC TERMINAL DEFINITIONS (FIGURE 6)
LOGIC GND Terminal: Connects to the logic ground of an automatic mixer, switcher, or other equipment. Can be modified to prevent ground loops. Refer to the ªMX392 Log- ic Modificationsº paragraph.
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 pro- vides a momentary closure when S1 is Off and a latching clo- sure when it 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.
MX392 LOGIC MODIFICATIONS
To gain access to the logic terminals, remove the grille re- tainer screw, the grille retainer, foam screen, and grille, 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.
Custom Switch Modifications
S4 is available for custom logic modifications. When S4 is in the ON position, pad W4 is connected to pad W5.
DESIRED MICROPHONE FUNCTION | USER ACTION REQUIRED |
| DIP SWITCH SETTINGS |
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Push to Mute (As Shipped) | Press and hold switch to temporarily mute micro- | S1 = OFF | |
| phone; release switch to unmute | S2 | = OFF |
| LED turns on when microphone is active | ||
| S3 | = OFF | |
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| S4 | = OFF |
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Push to Talk | Press and hold switch to activate microphone; | S1 = OFF | |
| release switch to mute | S2 | = ON |
| LED turns on when microphone is active | ||
| S3 | = OFF | |
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| S4 | = OFF |
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Push On/Push Off | Press switch to toggle microphone on or off | S1 = ON, | |
| LED turns on when microphone is active | S2 = ON for muted initial state | |
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| S2 | = OFF for active initial state |
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| S3 | = OFF |
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| S4 | = OFF |
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Switch Deactivated, Microphone Always | LED Always OFF | S3 = ON | |
Active |
| S4 = OFF | |
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Switch Deactivated, Microphone Always | Short LED IN terminal to LOGIC GROUND termi- | S3 = ON | |
Active | nal | S4 = OFF | |
| LED Always ON | ||
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Automatic Mixer Mode (MX392 models | If S1=OFF, SWITCH OUT signal will be momen- | S1 = ON or OFF | |
only) | tarily logic low when switch is pressed | S3 = ON | |
| If S1=ON, SWITCH OUT signal will be latching | ||
| S4 = OFF | ||
| logic low when switch is pressed | ||
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| Connect SWITCH OUT signal to various logic in- |
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| puts of automatic mixer for custom functions |
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| Connect mixer channel GATE OUT to microphone |
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| LED IN. LED on microphone turns on when its |
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| channel is gated on |
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NOTE: S4 is available for custom applications.
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