MODIFICATIONS TO MC2000 AND MC2500 DESKTOP REMOTES TO ALLOW USE OF RMN5068 DESK MICROPHONES

MODIFICATIONS TO MC2000 AND MC2500 DESKTOP REMOTES TO ALLOW USE OF RMN5068 DESK MICROPHONES

The RMN5068 microphone will not have any audio when used with the MC2000 and MC2500 remotes because the DC bias and load resistors in the remote's microphone input circuit are too low in value to provide the proper voltage and load impedance to the microphone's built in preamplifier. These resistors must be changed as follows:

1. On the top circuit board, remove resistors R101, R102, R103, and R104.

2. Place a 560 ohm resistor at location R101.

3. Place an 820 ohm resistor at location R103.

4. Leave locations R102 and R104 empty.

These resistors are surface mount parts.

To enable the RMN5068 microphone to be live even the paddles are not pressed (as for footswitch operation) and to make both paddles transmit push to talk, remove the bottom cover of the microphone and set DIP switches 1 and 8 to off and switches 2 through 7 to on.

... WZW