Need help sorting out intercom handset replacement problem!!

Hi there just stumbled across this forum by chance and must say looks like the sort of place i need.

Need some serious advice from anyone who knows their stuff with intercom systems.

Hi there basically am a spark with some door entry knowledge but i am stumped by this one!!
Had a job to replace a faulty handset which basically has its unlock button broken.
The way someone got round this was to wire straight from the handset to a desk mounted retractive switch.
Whilst this worked fine the customer wanted it all working from one handset so i ordered a handset to replace it.
I didn't buy the same model as all the original handset was doing was just being able to communicate between desk to door and then door release.
Problem is i have tried to wire up new handset without any wiring diagrams and what ever configuration i do i can not communicate between handset and front door panel unless i press the lock release button!!!
Has anyone got any ideas where i am going wrong the handsets basically have same amount of terminals/cables etc...
Original handset was a Videx 924M new one is similar but is a Fermax.
Many thanks for any help given.

They both have a PCB. i should guess one has different internal connections than the other. easiest option get same make of handset as original

breezer said:

They both have a PCB. i should guess one has different internal connections than the other. easiest option get same make of handset as original

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Yes your right but i'm hoping someone out there may be able to help.

short of chopping up the pcb i dont see how they can. a new handset is less than £20

Now, would this actually be a rebranded fermax unit?? newlec by any chance?

Atilla said:

Now, would this actually be a rebranded fermax unit?? newlec by any chance?

Click to expand...

Yes i think your right!!
Is that bad news!

buggy said:

Atilla said:

Now, would this actually be a rebranded fermax unit?? newlec by any chance?

Click to expand...

Yes i think your right!!
Is that bad news!

Click to expand...

Other than you seem to be buying kit with no instruction/wiring notes and Newey don't give this info.
Now, your easiest option is prob ring Fermax in morning - if they want to help.
I take it the labour charges are now eaten up on this job?

Yeh they probably would be if i end up buying new handsets!
May go down phone routr or see if i can email them.
Thanks for your advice.