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Saeco Royal Professional - Brewunit Block

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  • #16
    Originally posted by teds01 View Post
    Can anyone provide any more suggestions on this? Noidle22, should the current draw display on the screen? Thanks
    Sorry I forgot about this thread, my apologies.

    The gear motor current draw will not show on the screen during the test.

    I've had another thought; in Saeco machines, the big power transistor that drives the gear motor can go bad and cause it to slow down. If for some reason it's operating correctly but then overheats or breaks down in some way whilst driving the motor this may trigger the error.

    This is certainly a cheaper and easier option than pulling the gearbox and replacing the gear motor.

    The transistor is a TIP33C and is available from RS Components. You will also need some thermal paste, soldering iron/solder and soldering skills.
    The transistor is mounted to a fairly large heatsink on the main power board.

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    • #17
      Great, thanks for the replies. I've read about this transistor failing and found a youtube vid (german) of someone replacing the tip33c in an earlier model saeco. I might give this a go, the part is cheap and I think I can manage the soldering. I'll let you all know the result. Thanks

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      • #18
        Hi,

        Just a quick update, I replaced the tip33c transistor. The transistor I replaced seemed to be faulty, however after reassembling the machine, I still received the 'Brewunit Block' message. From what I've read on the web, it is often recommended to also replace the 1.3w 33v zener diode too. Being impatient, I went to Jaycar and they gave me 1w 33v zener diodes, I used one of those, but still got a 'Brewunit block' message. I've removed the new tip33c to compare it with another new one, and it tests ok.... could the lower watt diode be a problem? If not, any recommendations on what could be the next part to check/replace? There seems to be repair kits for the Saeco with this brewunit problem that contain a range of other parts (on germanys ebay). Any ideas? Thanks!

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        • #19
          Hi teds01 and others.

          Great information regarding the above... Thanks.

          Did you ever get your SUP016RE working again?

          I too have an exact same model, "brewunit block." message.
          The brew unit was attempting to move and you could hear the strain on the motor trying to move. So I removed the screw to remove the BrewUnit out.
          I then placed it in test mode after the brew unit mechanism was getting jammed to try and line up the brewunit in reset position with the motor position.

          I then tricked the machine to thinking the brewunit was installed.
          I was able to run the coffee machine in service mode : middle top + bottom furthest right buttons on the LCD Panel upon power up.
          Then button left and middle on the top was allowing the gear to spin CW and ACW. (As per the troubleshootting steps in the jpg file above).

          The motor was spinning CW and ACW only for a short period with and without the brewunit re-installed (but kept coming up with the error "Brewunit Block) and continually getting stuck.

          It now stops performing this function in TEST mode with CW or ACW (Even after completely powered off and cooled down).
          The coffee grinder and dropper all appear function ok in test mode.

          Appears to be heating up ok too.


          So I am thinking a faulty motor or faulty power board behind the LCD.

          I managed to pull out the power board and located both the TIP33C and Zener Diode, but not yet sourced or replaced them.

          Did you manage to get yours to work after the TIP33C and Zener Diaode replacement?
          Or was it something else?

          Any pointers appreciated?

          Also - RS Components no longer stock the TIP33C. Is there a replacement Power Transistor that can be used as opposed to the TIP33C?

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          • #20
            This is caused by one of these reasons:1. Bad micro switch2. Disconnected plug3. Bad brew drive motor (open coil or shorted motor)4. Miss-wiring, or no cant nudity5. Bad or loose connection6. Jammed brew group (brew unit)7. Cup warmer plate defects (only for Roy. & Magic’s)8. Bad CPU or PCB boards

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            • #21
              Originally posted by dcs730 View Post

              Also - RS Components no longer stock the TIP33C. Is there a replacement Power Transistor that can be used as opposed to the TIP33C?
              RS might not but Farnell / Element14 do: the package has changed to TO247 but it's backwards compatible (and actually easier to use because the tab is now isolated rather than being live to the collector).

              If they didn't all you need to do to find a replacement is navigate to RS products directory, select semiconductors: discrete semiconductors: BJT and bipolar transistors and enter a few terms in the filter

              NPN
              Collector current 10A - 20 A
              Collector Voltage 100V - 250V

              and select the appropriate package: Here I've selected everything with a package that is backwards compatible with TO218. Double check that the pinout is right: Base Collector Emitter 1 2 3 but that pinout is the most common for NPN power transistors.

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