m5svv1-1 repair

Dieses Thema im Forum "*** SAECO Eng. ***" wurde erstellt von TonyP, 6. September 2016.

  1. bgcanib1

    bgcanib1 Teetrinker

    Beiträge:
    8
    Thanks for your reply.
    According to my measurements at the LM2940 - when switched on cold - it measures 8.9V at the input and 4.5V at the output. When normal operating (same as switched on hot) it's 12.5V at the input and 4.75V at the output. It seems that something squeeze high power at the low voltage level when the machine is cold and after some time it gets back to normal. I've measured the capacitors, they seems to be good but I will double check. According to your diagram are the D1 and D13 zener diodes 5.6V and 4.7V respectively?
     
  2. hmilbradt

    hmilbradt Administrator

    Beiträge:
    26.990
    Yes they are.. But D13 actually is not involved with the 5 VDC power supply. This part of the circuit creates a 100 Hz Zero-Voltage-Crossing signal of the mains sinus curve. The microprocessor uses it to fire the triacs at the correct time. D1 limits the max. output voltage auf the power supply. Its an additional safety feature.
    By the way. The thread was opened wtth problems of a M5SVV1-1 PCB. Does your machine use this PCB ??
     
  3. bgcanib1

    bgcanib1 Teetrinker

    Beiträge:
    8
    Actually my power board is M5DPWRV15 and the CPU board is M5DCPUV16 , but since only this section is in English and I didn't find any other treads about these I've posted here. If it's not the right place please tell me where I can look for support. Anyways I continue to struggle with this issue. There is something wrong in the power supply or something else, I have unplugged the cable between the 2 boards and when the machine is turned on there is the dozer magnet coil and the relay that turn on permanently.
     
  4. hmilbradt

    hmilbradt Administrator

    Beiträge:
    26.990
    ok. the cafe nova uses the same boards. There is a diagram of the predecessor power board M5DPWRV1-1 and the predecessor logic board M5DPCPUV1-2 in the forum .....

    Links für Gäste nicht sichtbar!

    ....... both were reverse engineered by WolleP .
     
  5. bgcanib1

    bgcanib1 Teetrinker

    Beiträge:
    8
    Thanks a lot for your support, hope to find the short circuit soon. I will post the results...
     
  6. bgcanib1

    bgcanib1 Teetrinker

    Beiträge:
    8
    Hurrah! I did it!

    There was a bad capacitor C1-470 uF at the power supply circuit. After changing it works great now. Thanks for the links, this forum is great.

    Best,
    Ivo
     
  7. hmilbradt

    hmilbradt Administrator

    Beiträge:
    26.990
    Thank you for the feedback.

    Harry
     
  8. TonyP

    TonyP Teetrinker

    Beiträge:
    13
    I finally got around to soldering a new microprocessor onto my M5SVV1-1 board after it arced over. I am happy to say that it was successful and I am now enjoying fresh coffee from my old machine again.

    I bought a used Saeco Magic Comfort to get me by while my Vienna was broken, and I have noticed that the Magic heats up much more quickly (50 seconds from off overnight, ambient room temperature 20°C vs the Vienna 2 mins 5 seconds).

    Would anyone with a Vienna twin boiler be able to time their machine on startup, or is anyone able to tell me if this is normal?

    I descaled the machine and this didn't help the warmup time, besides we have very soft water here.

    Thanks, Tony.
     
  9. Grisu

    Grisu Team

    Beiträge:
    7.763
    Ort:
    Wien
    found in Service manual cold water (10°C) about 2,5 min.
    second boiler I think is only for Rapid Steam (fast steaming) and has nothing to do with heating for brewing.
    from here:

    Links für Gäste nicht sichtbar!

     
    Zuletzt bearbeitet: 31. März 2017
  10. TonyP

    TonyP Teetrinker

    Beiträge:
    13
    Thank you Grisu. The Magic Comfort is 1250 watts and one boiler, the Vienna is also 1250 watts but 2 boilers, naturally will take twice as long to warm up.
     

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