Can just a speaker in intercom panel be replaced?

[ahlondon]

Outdoor doorbell-intercom unit lets the residents hear outside from their handset in the flat, but the visitor cannot hear any of them. Handset issues have been ruled out. The speaker was making a loud cracking sound prior to failing which I read is a sign of a speaker that's about to die.

Can I swap it to a similar sized speaker? I can perhaps get it out of an old radio or desktop speaker and solder it?

 

[sparkymarka]

Yes but it will need to be the same size / ohms / and power rating …also not be a paper cone speaker as they don’t stand up to the weather
Post picture of the intercom unit

 

[ahlondon]

Yes but it will need to be the same size / ohms / and power rating …also not be a paper cone speaker as they don’t stand up to the weather
Post picture of the intercom unit

Connections could be corroded?

 

[sparkymarka]

You will have to remove the pcb with a bit of luck the info will be on the the speaker I would normally de solder one of the leads on the speaker and check it with a multimeter set to ohms

 

[sparkymarka]

Also measure the speaker across probably a 50/60mm speaker

 

[ahlondon]

You will have to remove the pcb with a bit of luck the info will be on the the speaker I would normally de solder one of the leads on the speaker and check it with a multimeter set to ohms

Hopefully it comes away easily. It has 12v feeding it; do the ohms and watts matter a lot? Would a 12v signal in this type unit blow the speaker or perhaps not produce enough sound? Is any movement from the ohms/w okay? Was thinking of getting:

 

[sparkymarka]

Yes it does ….post picture of the speaker it’s normally printed on the back …example

 

[ahlondon]

Yes it does ….post picture of the speaker it’s normally printed on the back …example

Sadly no markings visible

 

[sparkymarka]

Post me a picture of one of the handsets…

 

[ahlondon]

Post me a picture of one of the handsets…

It's this one:

https://www.intercomsrus.com/handset_documentation/Kallglobe%20TN-5HK%20Intercom%20Handset%20Data%20Sheet.pdf

 

[ahlondon]

Post me a picture of one of the handsets…

Is there a typical/average speaker type that is used in units whatever the brand?

 

[sparkymarka]

I’ve got over 20 speech units / and replacement speakers that I carry for repairs the speakers range from 8 - 50 ohm …my first step would be to desolder the speaker and check to see if it’s open circuit …

 

[hllns]

The furthest holes round the speaker look like the PCB (and the back of the speaker) have been somewhat open to the elements.
From the latest pic it looks like two of the axial blue electrolytic capacitors might be in poor nick if functional, I'd be tempted to replace those and check anything else obviously corroded whilst you have board open.

 

[sparkymarka]

Looks like they went bust about 10 years ago
Give these a ring next week as it looks like they may have a replacement speech amp

 

[ahlondon]

The furthest holes round the speaker look like the PCB (and the back of the speaker) have been somewhat open to the elements.
From the latest pic it looks like two of the axial blue electrolytic capacitors might be in poor nick if functional, I'd be tempted to replace those and check anything else obviously corroded whilst you have board open.

Thanks, I connected a speaker to it and there was zero feedback so it could be a capacitor or something rusted that has failed.