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Thread: Help needed with timer switch on Cunill grinder

  1. #1
    Senior Member LeroyC's Avatar
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    Help needed with timer switch on Cunill grinder

    I'm wondering if any of you techs or electronics guys can help me sort out/replace the switch on my Cunill Tranquilo grinder. I'm modifying it to make it a bit more user friendly and one thing that needs replacing is the completely useless timer switch. With just 50mm flat burrs it's a relatively slow grinder. That would be fine if it just had an on-off switch or a timer with a greater range of adjustment. Unfortunately the timer only gives you about 7g of coffee set at its maximum setting. So to grind even my smallest dose I have to press it 3 times which is just annoying. It's a push button on the side of the machine too so it's not like a K3P or anything with the switch in front of the PF.
    I've taken the control board out and as you can see it looks like the timer is integrated and can't be bypassed or removed, so I'm probably just going to need to replace it I guess. I'm happy with any kind of on/off switch really - push button, toggle, rocker, but don't want to have to cut holes in the side of the grinder. There's already a rocker switch on the other side to power up the grinder. Any advice or recommendations are much appreciated.

    You can just see the green push button on the side of the machine in this photo-





  2. #2
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    You are sure the potentiometer is set correctly?

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    A quick google gives me the impression that it is only supposed to do 7g shots, so maybe this is a good as it gets.
    Other forums indicate that the timer can be replaced with a toggle switch as it is basically just controlling power to the motor from the main switch on the other side. It could theoretically be bypassed completely if you were comfortable with wiring.

  4. #4
    Senior Member LeroyC's Avatar
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    Thanks Timmy. Yeah I did a bit of Googling too and came up with much the same. Hence why I'm seeking assistance as I know absolutely nothing about electronics and all I've ever done thus far in any of my machine modding or refurbing is to unplug and replug wires and thermostats back where they came from.
    So I'm looking for the easiest solution here. It sounds like maybe a toggle switch, but does that mean I do away with this whole control board or do I need to attach the new toggle to this control board in place of the current switch and pot?

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    The new toggle switch would replace the entire board. You would essentially have 2 wires from the main switch and 2 wires to the motor, but it might look more complicated inside!
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  6. #6
    Senior Member level3ninja's Avatar
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    I don't see why you would need a second switch at all. Is there anything else in the grinder that uses power other than the motor and the timer? If you bypass the timer your main switch will directly operate the motor.
    Last edited by level3ninja; 11th September 2017 at 05:20 PM. Reason: Autocorrect

  7. #7
    Member alexm1's Avatar
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    Quote Originally Posted by LeroyC View Post
    I'm wondering if any of you techs or electronics guys can help me sort out/replace the switch on my Cunill Tranquilo grinder. I'm modifying it to make it a bit more user friendly and one thing that needs replacing is the completely useless timer switch. With just 50mm flat burrs it's a relatively slow grinder. That would be fine if it just had an on-off switch or a timer with a greater range of adjustment. Unfortunately the timer only gives you about 7g of coffee set at its maximum setting. So to grind even my smallest dose I have to press it 3 times which is just annoying. It's a push button on the side of the machine too so it's not like a K3P or anything with the switch in front of the PF.
    I've taken the control board out and as you can see it looks like the timer is integrated and can't be bypassed or removed, so I'm probably just going to need to replace it I guess. I'm happy with any kind of on/off switch really - push button, toggle, rocker, but don't want to have to cut holes in the side of the grinder. There's already a rocker switch on the other side to power up the grinder. Any advice or recommendations are much appreciated.

    You can just see the green push button on the side of the machine in this photo-




    Leroy, have you considered that the motor may overheat if used for a longer time than it is designed for?
    I am not at all familiar with your grinder but would be cautious of leaping in and making changes without understanding the design specs and the circuits involved. Some of the advice you are getting suggests this in an easy mod, suggest you ask for a circuit diagram before you change anything.
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  8. #8
    Senior Member LeroyC's Avatar
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    Quote Originally Posted by level3ninja View Post
    I don't see why you would need a second switch at all. Is there anything else in the grinder that uses per other than the motor and the timer? If you bypass the timer your main switch will directly operate the motor.
    Yeah that could be an option. I actually quite like the idea of a toggle as it would be in a good spot and would be easier to use than the big rocker switch on the other side. So I'll look for a toggle first, but I'll keep this in mind if I can't find one I like.

  9. #9
    Senior Member LeroyC's Avatar
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    Quote Originally Posted by alexm1 View Post
    Leroy, have you considered that the motor may overheat if used for a longer time than it is designed for?
    I am not at all familiar with your grinder but would be cautious of leaping in and making changes without understanding the design specs and the circuits involved. Some of the advice you are getting suggests this in an easy mod, suggest you ask for a circuit diagram before you change anything.
    I have thought about that, but it's not like I want to use it for a bag grinder or anything, I just want to be able to do 20g or so in one go. It's supposed to be a light commercial grinder so I'd hope that the motor could handle 30secs of continuous use. I guess the other option would be a timer that has a greater range, but this could be a bit harder to find.

  10. #10
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    I've got a mazzer mini dozer, also notoriously slow. I have the auber instruments timer, just plug your grinder into it, leave grinder on.
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  11. #11
    Senior Member LeroyC's Avatar
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    Quote Originally Posted by seamad View Post
    I've got a mazzer mini dozer, also notoriously slow. I have the auber instruments timer, just plug your grinder into it, leave grinder on.
    Cool, I'll look it up. I'm guessing it's digital, but probably not cheap.

  12. #12
    Coffee Nut fg1972's Avatar
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    I reckon keep it simple and replace the green button and timer board with a toggle switch. What ever way you'd want to do it, you'd either need to be comfortable with wiring or have someone who is help you hence keeping it simple
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  13. #13
    Mal Dimal's Avatar
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    Quote Originally Posted by LeroyC View Post
    I have thought about that, but it's not like I want to use it for a bag grinder or anything, I just want to be able to do 20g or so in one go. It's supposed to be a light commercial grinder so I'd hope that the motor could handle 30secs of continuous use. I guess the other option would be a timer that has a greater range, but this could be a bit harder to find.
    G'day Leroy...

    That timer PCB is a pretty simple unit mate and any electronics repair shop guy would be able to trace out a schematic for it and adjust the sizing of a couple of components (resistors, capacitor) and increase the timer range for you...

    Mal.

  14. #14
    Senior Member LeroyC's Avatar
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    Quote Originally Posted by Dimal View Post
    G'day Leroy...

    That timer PCB is a pretty simple unit mate and any electronics repair shop guy would be able to trace out a schematic for it and adjust the sizing of a couple of components (resistors, capacitor) and increase the timer range for you...

    Mal.
    Hi Mal, when you say adjust the size of a resistor and capacitor do you mean actually replace them?

  15. #15
    Mal Dimal's Avatar
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    Quote Originally Posted by LeroyC View Post
    Hi Mal, when you say adjust the size of a resistor and capacitor do you mean actually replace them?
    Yes mate, exactly...

    Mal.
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  16. #16
    Senior Member LeroyC's Avatar
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    Can anyone tell me just by looking at the photos below which wires I'd need to join to bypass the circuit board for the timer and just connect the power switch directly to the motor?

    Here's all the wires present-




    And here's how they were initially connected to the circuit board-


  17. #17
    Coffee Nut fg1972's Avatar
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    Unless someone knows the machine like the back of their hand, it's a bit hard to tell just from looking at pics. You'd need to know where the wires go and understand what they are for to make that kind of call. Might be a good idea to let someone in the know take a look.
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  18. #18
    Senior Member level3ninja's Avatar
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    As above need to know where the other ends go
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  19. #19
    Senior Member LeroyC's Avatar
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    I thought as much. Thanks guys.

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