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[Solved] Cyfral Smart-5P Intercom Microphone Not Working After Replacing Fermax Model

rexxodus 603 11
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  • #1 21693748
    rexxodus
    Level 2  
    Hello,
    I replaced my old Fermax intercom with the new Cyfral Smart-5P. Everything works except the microphone. The person can't hear me.
    Do you have any idea what I'm doing wrong?

    Thanks for your advice.


    CYFRAL SMART-5P intercom circuit board with wires and buttons


    AI: Can you describe how you connected the wires from your old Fermax intercom to the new Cyfral Smart-5P? Did you follow a specific wiring diagram or color code?
    I followed the correspondence table provided by Cyfral.
    AI: Do you know what type of intercom system you have (for example, is it a 2-wire, 5-wire, or digital system)?
    I count 5 wires
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  • Helpful post
    #2 21693834
    Ircys
    Intercoms specialist  
    Give a photo of this old Fermax̌ uniphone including visible connections.
  • #3 21694159
    rexxodus
    Level 2  
    Hello,
    Here is the requested image. Thank you for taking the time to respond.

    FERMAX circuit board with multicolored wires and connector components
  • Helpful post
    #4 21694434
    barrrrrman
    Level 12  
    Try connecting as follows:

    Ring - 4 (red)
    SPK - 6 (violet)
    MIC - 2 (blue)
    Ground - 3 (I think it's green)
    SW1 - 1 (white)

    ZW1 and ZW2 jumpers pulled down and ZW3 put on.
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  • #5 21694517
    rexxodus
    Level 2  
    Hello barman,
    This is exactly the wiring I did. :) (first picture)
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    #6 21694604
    Ircys
    Intercoms specialist  
    Swap red <-> purple in place
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  • #7 21695509
    rexxodus
    Level 2  
    hello,
    I swapped the cables, it doesn't work, I wonder if the old installation was correct.
  • Helpful post
    #8 21695801
    Ircys
    Intercoms specialist  
    If you still have an old uniphone, plug it in and check.
  • Helpful post
    #9 21696933
    barrrrrman
    Level 12  
    You can also check with your neighbour whether he has the same colour wires connected.
  • Helpful post
    #10 21697852
    dawidoo2115
    Level 13  
    Maybe you just happened to come across a faulty unit? Sometimes this happens with new products.
  • #11 21722567
    rexxodus
    Level 2  
    See resolution below-
  • #12 21722569
    rexxodus
    Level 2  
    An electrician came by and the device was indeed defective! Thanks for your help, and sorry to have wasted your time.
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Topic summary

A user replaced an old Fermax intercom with a Cyfral Smart-5P model. While the system functions overall, the microphone on the new Cyfral unit does not transmit audio, preventing the person on the other end from hearing the user. The user followed Cyfral's wiring correspondence table and confirmed the system uses five wires. A request was made for a photo of the old Fermax uniphone with visible wiring connections, which the user provided to assist in diagnosing the microphone issue.
Summary generated by the language model.
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