\

Replacement Motherboard EXTEL OPEN 3K door station

The door station doesn't want to work anymore, doesn't ring your indoor monitor? The motherboard of your intercom panel is probably defective and needs to be replaced. Before any intervention or maintenance, please turn off all components of your video door phone and place yourself on a suitable surface to avoid scratching the door phone. intercom panel

This tutorial is applicable for:

Extel - 720330 - Open 3 K

Difficulté : Moderate

Temps nécessaire : 10 minutes

Nombre d’étapes : 4

Mise à jour : April 2025

Materials needed:

plastic spatula. electronic tweezers, Phillips screwdriver, flathead screwdriver

Tutorial steps:

Step 1: Dismantling the intercom panel

Turn the intercom panel over to gain access to the fixing screws.
Unscrew the 6 Phillips screws.

Remove the rear cover from intercom panel by lifting it upwards.

Step 2: Dismantling the motherboard

Disconnect the microphone using a small pair of pliers.
Do not pull on the wire, as this may damage it.

Unlock the camera cover by pushing back the two latches with a small flathead screwdriver.
Slide the plastic spatula under the tablecloth and remove it.

Disconnect the infrared LEDs using small pliers.
Do not pull on the wire, as this may damage it.

Disconnect the keypad using small pliers.

Disconnect the loudspeaker using small pliers.
Do not pull on the wire, as this may damage it.

Remove the 6 Phillips screws holding the motherboard to the chassis
You can now remove the motherboard and replace it.

Step 3: Replacing the motherboard

Replace the new circuit board and reconnect each component in reverse order.
Before repositioning the rear cover of the intercom panel, check that the gasket is correctly positioned in its slot.
Don’t forget to tighten the 6 screws on the rear cover of the intercom panel

The replacement is complete

Stage 4: Functional testing

Test short-range operation before final reinstallation.