Intercom Replacement Not Working (Bell 801)

[Massiveosh]

Hello, First Post.

I've been modernising my flat (7 flats all conneected to one system and have finally got round to replacing my old intercom.
Original looks like it's this model: Bell System (BSTL) 801 Old Style - site: https://interfoni.rs/wp-content/upl...-interfonska-slusalica-sema-prikljucaka-1.pdf

I took a photo whilst it was wired with the five cables screwed in.

I've bought a Bell 801 Door Entry System Handset and i've wired it exactly the same, and theres no noise.

The orignial one if i picked up the headset I could hearthe voice of the caller downstairs even if terrible quality feedback and release the door.

However it seems like no functions work, which is weird because it has the same layout with the board, one wird was never used and is covered but all other 5 i've placed in each same slot like for like.

Please help its confusing me a lot!

 

[sparkymarka]

Blown the fuse in the psu ?

 

[Massiveosh]

Can you eloborate on that? When you say in the PSU which item would that be?

 

[sparkymarka]

There is a 1amp fuse inside of this unit ( make sure it is isolated from the 240v supply ) , the old style unit looks like this …..