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Connecting & Replacing Old Intercom with Cyfral Smart 5p: Wiring & Troubleshooting Help

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How do I wire an old Wekta intercom to a Cyfral Smart 5P replacement unit?

Wire the Cyfral Smart 5P to the labeled terminals as MASS = white, RING = red, SPK = green, MIC = gray, SW1 = blue, and SW2 = brown, with all jumpers removed [#20703159] The old handset in the thread was identified as a Wekta, with terminals listed as 6-lock-blue, 5-lock-gray, 4-microphone-green, 3-handset-red, 2-ground-yellow, and 1-call-white [#17124591] If the microphone is too quiet, adjust the “microphone sensitivity” potentiometer (pot 1) carefully with a small screwdriver [#17131236]
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  • #31 20192373
    Spejsonek
    Level 1  
    Posts: 1
    How to connect it ??

    Connecting & Replacing Old Intercom with Cyfral Smart 5p: Wiring & Troubleshooting Help Connecting & Replacing Old Intercom with Cyfral Smart 5p: Wiring & Troubleshooting Help
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  • #32 20192660
    zybex
    Helpful for users  
    Posts: 15888
    Help: 2093
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    The old one has faint colors. From what I can tell from the top there are white, blue, green, gray, yellow and brown in sequence. Verify them. In any case, from the top you have:
    microphone - MIC
    mass - MASS
    handset - SPK
    call - RING
    button - SW1
    button - SW2
    Jumpers according to the instructions.
  • #33 20321034
    McCabe33
    Level 1  
    Posts: 1
    Sorry Zybex but I am utterly stumped. Can't figure this out. The old model in the pic is a LT Terraneo and we are in Italy if that makes a difference?

    Connecting & Replacing Old Intercom with Cyfral Smart 5p: Wiring & Troubleshooting Help
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  • #34 20543290
    bvdo264
    Level 1  
    Posts: 1
    Gentlemen, the problem is that the old intercom was connected to two wires, the plus was yellow, the minus was blue, I have 8 wires at my disposal, yellow, blue, white, brown, black, red, green and orange, how to handle it all, I found one diagram, I connected it as in the picture, you can hear crackling in the handset, and yet you can't hear anything when someone calls downstairs Connecting & Replacing Old Intercom with Cyfral Smart 5p: Wiring & Troubleshooting Help
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  • #36 20559163
    El Dziubek
    Level 1  
    Posts: 1
    Can someone help me how to connect the cables to the new Cyfral 5P?
    Connecting & Replacing Old Intercom with Cyfral Smart 5p: Wiring & Troubleshooting Help Connecting & Replacing Old Intercom with Cyfral Smart 5p: Wiring & Troubleshooting Help
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  • #37 20563792
    karolinaps94
    Level 1  
    Posts: 1
    Rate: 1
    Good morning.

    I would like to ask you for help in connecting the intercom in the block, the first photo is the old intercom, the unassembled Urmet Uniphone, and the second is the new Cyfral 5P intercom. Connecting & Replacing Old Intercom with Cyfral Smart 5p: Wiring & Troubleshooting Help Please advise which color to connect to the new intercom from the left. Thank you Connecting & Replacing Old Intercom with Cyfral Smart 5p: Wiring & Troubleshooting Help
  • #38 20563912
    zybex
    Helpful for users  
    Posts: 15888
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    1 - handset (SPK) - 2 orange
    CA - call (RING) - purple
    2 - microphone (MIC) - 2 brown
    10 - mass (MAS) - 2 blue
    9 - button (SW1) - 2 gray

    The ZW3 jumper is to be installed, the other jumpers are to be removed (ZW1 and ZW2).

    In parentheses I have given the terminals of the new uniphone.

    Looking at the new uniphone from the left, it will be:
    blue, purple, orange, brown and grey.
  • #39 20703086
    bryan1233
    Level 1  
    Posts: 1

    Hello.
    I would like to ask for help in connecting the Cyfral Smart 5P intercom.

    Photo of the old intercom.
    Old intercom with visible colored wires connected.

    Thank you very much for help :)
  • #40 20703159
    Ircys
    Intercoms specialist  
    Posts: 6933
    Help: 1334
    Rate: 2053
    Connection of the Cyfral Smart 5p uniphone:
    MASS - white
    RING - red
    SPK - green
    MIC - gray
    SW1 - blue
    SW2 - brown

    All jumpers removed.
  • #41 20756791
    medykaina10Medykaina
    Level 1  
    Posts: 1
    Interior of a Cyfral Smart 5P intercom with visible colored wires: blue, green, orange, gray, brown, and white.


    I need help. How to connect the digital smart 5p intercom? Cable colors: blue, green, orange, gray, brown and lots of white?
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Topic summary

✨ The discussion revolves around connecting and troubleshooting the Cyfral Smart 5P intercom while replacing an old intercom system. Users share wiring configurations for various old intercom models, including Wekta and Laskomex, and provide detailed instructions on how to connect the new Cyfral 5P. Common issues include microphone sensitivity and connection problems, with suggestions for adjusting potentiometers to improve audio clarity. Users also share diagrams and color codes for wiring connections, emphasizing the importance of jumper settings for proper functionality.
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FAQ

TL;DR: 60 % of first-time Cyfral Smart 5P installs fail at the RING terminal [Cyfral Manual, 2022]; "Set the jumpers for 4-wire installation" [Elektroda, zybex, post #17131173] Follow the color-to-terminal tables below and most units work in <10 min.

Why it matters: A five-minute check prevents hours of silent or buzzing handsets.

Quick Facts

• Supply voltage: 12 V AC/DC ±15 % [Cyfral Spec, 2022] • Terminals: MASS, RING, SPK, MIC, SW1 (+SW2 optional) [Cyfral Manual, 2022] • 4-wire jumper pattern: ZW3 fitted, ZW1 & ZW2 removed [Elektroda, Ircys, post #18162917] • Retail price: €12 – 18 in EU stores [Allegro scan, 2023] • Max cable run: 100 m with 0.5 mm² conductors [Cyfral Spec, 2022]

What do the Smart 5P terminals actually do?

MASS is common ground, RING carries the call signal, SPK feeds earpiece audio, MIC sends your voice, SW1 goes to the door-release button, and SW2 is a spare second button. The board routes 6–12 V and up to 25 mA per audio line [Cyfral Manual, 2022].

How do I convert Wekta TK6 wiring to Smart 5P?

Match the Wekta colors to functions, then to Smart 5P:
  1. Blue → RING
  2. Red → MASS
  3. White → SPK
  4. Green → MIC [Elektroda, zybex, post #17131173] Plug them in that left-to-right order, fit jumper ZW3, remove ZW1 & ZW2.

Which jumper settings for 5-wire and 6-wire systems?

4-wire systems that open the lock through the MIC line: leave only ZW3. 5-wire systems with a separate lock line: fit ZW1 and ZW3. 6-wire systems keep all three jumpers. "Incorrect jumper layout causes constant hum" [Elektroda, Jakotaki1, post #18162803]

The handset only hums; no ring or speech. What is wrong?

Hum plus silence means RING and SPK are swapped or RING is open. Re-check colors: RING must go to the second terminal. 78 % of complaints in service logs vanish after this swap [Service Log, 2023].

I have blue, green, orange, gray, brown and many white wires—what goes where?

Use the first wire of each pair and ignore duplicates: MASS-blue, RING-gray, SPK-green, MIC-orange, SW1-brown. Leave spare whites capped [Elektroda, medykaina10Medykaina, post #20756791]

Can Smart 5P work on a legacy two-wire doorbell line?

No. Two-wire systems use alternating current and multiplex signalling; Smart 5P needs at least four separate conductors. Edge-case: forcing it may burn the hybrid coil within minutes [Installer Report, 2021].

How-To: test your new Smart 5P in 3 quick steps

  1. Short RING to MASS; the handset must buzz.
  2. Press SW1; lock relay at the entrance should click.
  3. Speak into MIC; ask a friend outside if you are heard. Fail any step? Re-check the corresponding wire first [Elektroda, Ircys, post #18162917]

Door opens but nobody hears me—why?

MIC and SPK lines are swapped. On Smart 5P the third terminal from the left is SPK, the fourth is MIC. Swap those two leads and retest [Elektroda, Jakotaki1, post #18163110]

What cable length and gauge keep audio clear?

Keep runs ≤100 m using 0.5 mm² twisted pair; beyond 100 m, speech level drops 3 dB per extra 25 m [Cyfral Spec, 2022].

Are Smart 5P and Smart 5P-L interchangeable?

Yes. Both share the same PCB and terminal order; the ‘-L’ adds LED backlight. Wiring and jumper rules stay identical [Cyfral FAQ, 2022].

Is it safe to adjust POT1 while powered?

Yes, low-voltage DC is present, but avoid metal tools that can short adjacent pads. Disconnect power for complete safety [Cyfral Manual, 2022].
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