My BZ35e has been plagued with a screaming LOUD vibe pump. I knew this wasnt right because a mate has the same machine with a much quiet(er) vibe pump. The pumps are Fluid-o-tech units and are usually found in the more expensive machines (as these pumps are slightly more expensive). They are advertised as "quiet" pumps. Well mine wasnt.
So I bought a new pump and refitted it. I also paid attention to pipe routing and replaced the rubber pump mounts.... but no change....
I cant emphasise how loud this thing was running. I was almost considering putting it on ebay, or retrofitting a rotary pump.
Anyway, the clue was my mate saying that he thought my pump had a much higher pitch. When I listened to his I agreed. Id estimate about twice the frequency (ie rather than 50 Hz, more like 100 Hz).
Vibe pumps are basically all the same design and they all use a diode to rectify the mains ac power, meaning they only use half an ac cycle. The difference with the fluid-o-tech pump is that the diode is found in the plug, not in the pump body, like an Ulka or Eaton pump. So the other night, I put my coffee craving on hold and dismantled the plug attached to the pump and checked the diode with a multimeter. Sure enough, the diode had shorted. Viola! So scratching around in some old circuit boards I found a nice big diode with a similar rating, removed it and fitted it to the plug.....
Now the pump works like it was supposed to.
Im not sure how common this fault is. Diodes dont tend to blow very often. But just in case someone else has a very loud vibe pump, then this just might be the cause of the problem. Even if its an Ulka or Eaton pump, if the diode has shorted, then just adding another diode in series (eg a 1N4008 or equivalent) should fix the problem.
BTW: the coffees actually tasting better now as well.
Cheers,
Mark.
So I bought a new pump and refitted it. I also paid attention to pipe routing and replaced the rubber pump mounts.... but no change....
I cant emphasise how loud this thing was running. I was almost considering putting it on ebay, or retrofitting a rotary pump.
Anyway, the clue was my mate saying that he thought my pump had a much higher pitch. When I listened to his I agreed. Id estimate about twice the frequency (ie rather than 50 Hz, more like 100 Hz).
Vibe pumps are basically all the same design and they all use a diode to rectify the mains ac power, meaning they only use half an ac cycle. The difference with the fluid-o-tech pump is that the diode is found in the plug, not in the pump body, like an Ulka or Eaton pump. So the other night, I put my coffee craving on hold and dismantled the plug attached to the pump and checked the diode with a multimeter. Sure enough, the diode had shorted. Viola! So scratching around in some old circuit boards I found a nice big diode with a similar rating, removed it and fitted it to the plug.....
Now the pump works like it was supposed to.
Im not sure how common this fault is. Diodes dont tend to blow very often. But just in case someone else has a very loud vibe pump, then this just might be the cause of the problem. Even if its an Ulka or Eaton pump, if the diode has shorted, then just adding another diode in series (eg a 1N4008 or equivalent) should fix the problem.
BTW: the coffees actually tasting better now as well.
Cheers,
Mark.


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