HomeRoast Digest


Topic: OT: machine repair (4 msgs / 110 lines)
1) From: Jeffrey Copeland
Hi All,
I recently picked up a used Omnibar Firenze espresso machine from ebay
for a few hundred that is not fully functional and I'm looking for
recommendations for sourcing parts to repair it.
The machine is actually a Brasilia Firenze SL single group (E61),
http://www.cafeambassador.com/products/equipment/brasilia_firenzesl/)plumbed in w/rotary pump. The machine heats up (boiler cycles on/off)
and both boiler/pump pressures appear normal. It delivers steam and hot
water. The problem is that there is no flow through the group head :-(
The machine appears mechanically sound and clean. I need to confirm if
the solenoids are functioning, but there is also an electronic control
unit (boiler control?) that unplugged during shipping and bounced
around. Any pointers to people/places to assist in diagnosing the
problem and buying parts from would be greatly appreciated.
Thanks in advance -- Jeff
begin:vcard
fn:Jeffrey Copeland
n:Copeland;Jeffrey
org:National Center for Atmospheric Research;Research Applications Program
adr:;;P.O. Box 3000;Boulder;CO;80307-3000;USA
email;internet:copeland
tel;work:303-497-2830
tel;fax:303-497-8401
tel;cell:970-412-6158
x-mozilla-html:TRUE
urlhttp://www.rap.ucar.eduversion:2.1
end:vcard

2) From: Paul Sack
There are probably better places to ask about this kind of thing 
(alt.coffee, coffeegeek, or home-barista).
But anyways:
There is a problem with either the pump, the brainbox, or the group 
solenoid/3-way valve. Or maybe the brew switch itself or some wiring. 
Who knows?
Does the pump make a noise when you press the brew switch? If yes, 
unplug the pump. Can you now hear the group solenoid click when you hit 
the brew switch? Is it getting power (hook up a multimeter to the wires 
if you can get to them)?
If the brainbox is fried that's going to cost a lot of money most 
likely. (Which is annoying because all the functionality could be done 
with a $2 microcontroller and a few bucks worth of other parts.)  Does 
your machine have volumetric dosing? (I.e., is it an automatic or a 
semi-automatic?) You might be able to convert it to a semi-automatic 
then and get it to work.
Even if the machine seems to work otherwise, you should probably take 
the boiler and group apart and give it a good cleaning and descaling.
For parts, I'd suggest cafeparts.com, espressoresource.com, or 
espressoparts.com. There are others, too, that I am not as familiar with.
Good luck!
-Paul
Jeffrey Copeland wrote:
<Snip>

3) From: Brett Mason
descale everything first.  Then if anything is loose, it won't go
create a clog...
Then diagnose as described...
Brett
On 8/23/06, Paul Sack  wrote:
<Snip>
-- 
Regards,
Brett Mason
 HomeRoast
   Zassman

4) From: Michael Dhabolt
Jeff,
I just had to fix a 'La Cimbali' single group machine for a friend.
The machine had set for a while and acted just like what you are
describing.  It would not develop any shot pressure flow through the
group head.  I checked out the signal to all the solenoid valves -
everything was hotting up when it should.  So I started at the pump
and loosened connections (group head side of valves) to see if it was
getting pressure through each valve.  The flow meter was not passing
pressure - took it apart (carefully) and it was plugged with some
scale - cleaned the scale out. everything started working.......did
some serious citric acid flushing. works like a charm.
Mike (just plain)


HomeRoast Digest