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Motorola PMN4107B Microphone Modification for MIC-CONNECTOR (M002)

Summary

This guide describes how to adapt the standard Motorola PMN4107B palm microphone cable to the MIC-CONNECTOR (M002) interface by replacing the original Motorola plug with an RJ45 connector.

Required Tools

• RJ45 crimping tool
• Wire cutters
• Cable stripper
• New RJ45 connector
• Protective rubber boot
Important

Slide the protective rubber boot onto the microphone cable BEFORE cutting the wires and crimping the connector. It cannot be installed after crimping.

Steps

Step 1. Cable Preparation

1. Cut off the original Motorola connector from the microphone cable using wire cutters.
2. Slide the protective rubber boot onto the cable and move it away from the working area.
3. Strip 20-25 mm of the outer cable jacket without damaging the inner conductors.
4. Separate the internal strength member (nylon cord) together with the brown wire and cut them flush at the edge of the outer jacket. The brown wire is not used in the MIC-CONNECTOR (M002) wiring scheme.
5. Straighten the remaining 4 wires (green, red, black, gray) and align them parallel to each other in the required order.

Step 2. Trim to RJ45 Length

1. Hold the 4 wires tightly and trim them to a length of exactly 12-13 mm from the outer jacket cut.
2. Insert the wires into the RJ45 connector (latch facing down) according to the pinout below.

RJ45 Pinout

RJ45 Pin Wire Color Signal
1 (empty) -
2 (empty) -
3 Green PTT (Push-to-Talk)
4 Red MIC (Microphone)
5 Black GND (Ground)
6 Gray HOOK (Hook sensor)
7 (empty) -
8 (empty) -
Note

Do not strip the individual insulation from the colored wires. The connector blades will pierce it during crimping.

Step 3. Verification and Crimping

1. Push the wires fully into the connector. Verify through the transparent front that all 4 conductors reach the front wall and that the outer cable jacket enters the RJ45 body by 5-6 mm for secure retention.
2. Insert the connector into the crimping tool slot and squeeze the handles fully.
3. Slide the protective rubber boot over the crimped RJ45 connector.
Warning

The manufacturer may change the internal wire color coding across different production batches of the Motorola PMN4107B. If the wire colors differ from those listed, do not crimp by guessing. Verify the correct contacts with a multimeter or contact support for the current wiring reference.


Motorola PMN4107B Microphone Modification for MIC-CONNECTOR (M002)

Summary

This guide describes how to adapt the standard Motorola PMN4107B palm microphone cable to the MIC-CONNECTOR (M002) interface by replacing the original Motorola plug with an RJ45 connector.

Required Tools

• RJ45 crimping tool
• Wire cutters
• Cable stripper
• New RJ45 connector
• Protective rubber boot
Important

Slide the protective rubber boot onto the microphone cable BEFORE cutting the wires and crimping the connector. It cannot be installed after crimping.

Steps

Step 1. Cable Preparation

1. Cut off the original Motorola connector from the microphone cable using wire cutters.
2. Slide the protective rubber boot onto the cable and move it away from the working area.
3. Strip 20-25 mm of the outer cable jacket without damaging the inner conductors.
4. Separate the internal strength member (nylon cord) together with the brown wire and cut them flush at the edge of the outer jacket. The brown wire is not used in the MIC-CONNECTOR (M002) wiring scheme.
5. Straighten the remaining 4 wires (green, red, black, gray) and align them parallel to each other in the required order.

Step 2. Trim to RJ45 Length

1. Hold the 4 wires tightly and trim them to a length of exactly 12-13 mm from the outer jacket cut.
2. Insert the wires into the RJ45 connector (latch facing down) according to the pinout below.

RJ45 Pinout

RJ45 Pin Wire Color Signal
1 (empty) -
2 (empty) -
3 Green PTT (Push-to-Talk)
4 Red MIC (Microphone)
5 Black GND (Ground)
6 Gray HOOK (Hook sensor)
7 (empty) -
8 (empty) -
Note

Do not strip the individual insulation from the colored wires. The connector blades will pierce it during crimping.

Step 3. Verification and Crimping

1. Push the wires fully into the connector. Verify through the transparent front that all 4 conductors reach the front wall and that the outer cable jacket enters the RJ45 body by 5-6 mm for secure retention.
2. Insert the connector into the crimping tool slot and squeeze the handles fully.
3. Slide the protective rubber boot over the crimped RJ45 connector.
Warning

The manufacturer may change the internal wire color coding across different production batches of the Motorola PMN4107B. If the wire colors differ from those listed, do not crimp by guessing. Verify the correct contacts with a multimeter or contact support for the current wiring reference.


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