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Replacing the microphone on intercom panel EXTEL WAVE 2

You can't hear your visitors, or your video doorphone makes a loud crackling noise. The microphone on your intercom panel seems to be malfunctioning. Before carrying out any work or maintenance, please switch off all components of your video door entry system and place yourself on a suitable surface to avoid scratching the lens.

This tutorial is applicable for:

Extel - 720321 - Wave 2

Difficulté : Moderate

Temps nécessaire : 30 minutes

Nombre d’étapes : 6

Mise à jour : February 2025

Materials needed:

Phillips screwdriver, BTR 1.5mm, plastic spatula, precision pliers, B7000 glue

Tutorial steps:

Step 1: Remove front panel and battery

Position your intercom panel to gain access to the underside.
Use the 1.5mm BTR screwdriver to tighten the safety screw.
Turn the screwdriver anti-clockwise to tighten the safety screw.
ATTENTION: The safety screw uses a left-hand thread.

Insert the 1.5mm BTR screwdriver into the left-hand slot.

Lever up to remove the front panel.

Set the ON/OFF slider to OFF.

Remove the battery by pulling it downwards.

Step 2: Remove the back panel

Turn the intercom panel over and, using a Phillips-head screwdriver, remove the 6 screws at the rear of the intercom panel.

Step 3: Dismantling the circuit board

Carefully disconnect the microphone connector by pulling it upwards with precision pliers. Be careful not to pull on the wires.

Unscrew the 4 screws holding the intercom panel to gain access to the bottom connectors.

Use the plastic spatula to gently lift your PCB out of its housing.
1- Carefully disconnect the speaker connector
2- Carefully disconnect the connector from the call button
3- Carefully disconnect the infrared LED connector

Tilt the circuit board to the left so that it doesn’t interfere with the rest of the operation.

Step 4: Speaker replacement

Gently peel off the protective sheet using the plastic spatula.
WARNING: do not damage or bend it, as you will need to reinstall it later.

Unscrew white pressure plate with Phillips screwdriver
Then remove it using the plastic spatula.

Using the plastic spatula, lever the edge of the speaker to loosen it.
Remove speaker

Make sure the speaker is identical to the original.
Using B7000 glue, apply a thin strip of glue to the edges of the micro housing.
Glue the loudspeaker back together in the same direction as when it was dismantled, applying gentle pressure.
Wait 5 minutes.

Route the speaker wire under the battery gasket.
Reposition and screw on the pressure plate.

Reposition and reattach the protective sheet.

Step 5: Reassembling the circuit board

Temporarily reposition the circuit board on the chassis.
Ensure that the battery connector seal is correctly positioned
First, reconnect the lower connections:
1- Speaker
2- Call button
3- Infrared LEDs

Make sure the antenna wire is positioned on the left side of the chassis and reinstall the circuit board.
To aid positioning, guide holes are provided on the circuit board.

Make sure the ON/OFF switch on intercom panel is easily accessible.

Make sure the antenna wire is always correctly positioned and not twisted or pinched.
Using a Phillips screwdriver, tighten the 4 screws holding the circuit board in place.

Reconnect the microphone.

Step 6: Reassembling the door station

Turn the intercom panel over and, using the Phillips screwdriver, screw back the 6 screws at the rear of the intercom panel.

Reconnect the battery. Pay attention to the direction of insertion.
Switch to ON position.
Don’t forget to reassociate the monitor and intercom panel.
Test short-range operation before final reinstallation.