Next Door Neighbours (both disabled) have an external intercom which is connected to internal separate phone which can also open the gate
Exhibit a) External Intercom
Exhibit b) Wiring of external intercom
Exhibit c) Internal phone
Exhibit d) Inter wiring of the phone
Currently the intercom button and on the external intercom and phone is dead and the door release mechanism on the internal phone is dead button marked with a key
I have contacted Videx the manufacturer and they indicated;
Have you checked the voltages at the handset as per the guide? You should see the following (measured against 3):
Connection Voltages
1 12V DC (on hook) 4V DC (off hook) 0V DC (lock button pressed)
2 12V DC (on hook) ~0.8V DC (off hook)
4 4-12V DC (call button held)
If any of these are missing then do the same checks at the 836M, 4 from the handset should be connected to P1 at the door panel.
You can also test the release function of the 836M by putting a short between 1 and 3 to simulate pressing the button on the handset, if this works then the fault is with the cabling to the handset (likely as you also don’t have the speech) or a fault with the button in the handset, if it doesn’t work then short S to – to test the wiring.
If a single wire is down then it will be terminal 3 as this is the common negative side of everything in the handset so if this wire is not connected then the handset would be dead.
Wiring Guide
There is power to the external intercom but there is no speech nor can the gate be released from the phone internally
Couple are reluctant to call in the experts as a £££££££ awaits---so any ideas greatly appreciated--assume noddy knowledge on on part re electrics
many thanks for any guidance