[Solved] ACO INS UP 720 v2 without sound - checking the cables and the control unit

Hello
First of all, I know that there have already been topics about this intercom, but none of the solutions helped me, so... I`m asking for help.
My ACO Ins-UP 720 v2 intercom stopped working (it is deaf). I checked the voltage on the cable with a multimeter and it is 9V. The earpiece is deaf, there is no crackling sound when pressing the OPEN button. The cable connection is correct. The switchboard is made by ACO.
Is there a possibility of a short circuit on the cable? I would also like to mention that I had the door frames next to the intercom replaced. However, I don`t want to forge if I don`t have to (as I wrote above, the voltage is 9 V). I also checked the handset from the same intercom from a neighbor and nothing...
Attached is a photo of the intercom.
Help !!!

Gomez1981 wrote:

I also checked the handset from the same intercom from a neighbor and nothing...

Well, did you change her address or called your neighbor`s number?

My neighbor`s handset works, his handset doesn`t work in mine... I didn`t program anything.

Gomez1981 wrote:

My neighbor`s handset works, his handset doesn`t work in mine... I didn`t program anything.

Well, that`s the end of the search. I had exactly the same problem, they cut the cable when replacing the door. I didn`t bother with forging, I just changed the location of the uniphone, so that the new cable could run a short distance on top.

Well, the question is, if the cable was kinked, would I still have 9V on the wire? It is flexible and when I move it there are no voltage spikes (switches)....

Gomez1981 wrote:

Well, the question is, if the cable was kinked, would I still have 9V on the wire? It is flexible and when I move it there are no voltage spikes (switches)....

If there is voltage on the line, the cable is OK.

In these uniphones, the switch most often fails, so 95% of the time this is the cause of the fault.

Regards

So the plan now is to order a new system and replace it. When it arrives, I will check and let you know. Keep fingers crossed

INS-UP720B has a 3-step ringing volume control switch.
The switch used there does not tolerate excessive dust that appears, for example, during renovations, and this also applies to the switch.

It is worth cleaning it first, using gasoline or spirit (no WD 40!), and only then replacing it if necessary.

ROWE wrote:

INS-UP720B has a 3-step ringing volume control switch.
The switch used there does not tolerate excessive dust that appears, for example, during renovations, and this also applies to the switch.

It is worth cleaning it first, using gasoline or spirit (no WD 40!), and only then replacing it if necessary.

A beautiful theory, but unfortunately it does not work in the case of ACO uniphones.
ACO "digests" the virus of Chinese switches, which simply fall apart structurally (springs, plastic) and here dust, dust, etc., external factors have no influence on it. If you have any doubts, ask the source.

Regards

I know my experience + e.g. https://www.elektroda.pl/rtvforum/topic3312162.html, I do not intend to discuss this matter further.

Whose practice? Probably not yours? If my friend had one, he would know that the switches in these uniphones are a real curse and the most likely cause of the fault.
Regards

No comment.

The exchange was helpful. Works !