La Cimbali M30 Dosatron restoration - Really Done! - Page 10

http://users.rcn.com/erics/ · by **erics** on Thu Jan 14, 2010 5:46 pm

Yes, Dave's correct, BUT the sealing mechanism for these hoses is NOT the threads but a rubber o-ring that forms a face seal with the male nipple, similar to your typical garden hose but a little more robust. If you really wanted to match up perfectly, Chris' Coffee ( http://www.chriscoffee.com/) and Espresso Parts (http://www.espressoparts.com/) sell brass adaptors to go from 3/8"-19 -BSPP to 3/8"-18 NPT.

by **Paul** on Thu Jan 14, 2010 7:29 pm

for what its worth, my m31 inlet is 1/4"bsp and drain is 3/4". I think cimbali are just about the only mfr that don't use 3/8 for their inlets.

http://users.rcn.com/erics/ · by **erics** on Thu Jan 14, 2010 7:53 pm

It's worth a lot and has been recorded in the memory bank.

Mike - do not yet scratch that dishwasher hose idea. Assuming the fitting your Cimbali has is a 1/4"-19 - BSPP nipple, you can apply a BRASS adaptor available from your local hardware store that has 1/4-18 NPT female threads on one end and the 3/8" NPT male threads on the other. Now you will have to use a little teflon tape on the Cimbali fitting - about 2 to 3 turns, skipping the first 1-1/2 to 2 threads.

by **movnmik** on Thu Jan 14, 2010 10:10 pm

Eric,

I will look into your suggestion. Thanks.

Paul,

When I last looked at the inlet it does seem to be larger than a 3/8" fitting.

Thanks guys

Mike

http://users.rcn.com/erics/ · by **erics** on Thu Jan 14, 2010 11:03 pm

1/4" BSPP = 0.518" OD
1/4" NPT = 0.534 OD

3/8" BSPP = 0.656" OD
3/8" NPT = 0.671" OD

OD = outside diameter

by **movnmik** on Thu Jan 14, 2010 11:37 pm

err... that's right, 3/8 IS LARGER than 1/4". Thank god my life didn't depend on working with fractions! :oops:

by **cafeIKE** on Fri Jan 15, 2010 10:19 pm

Here's a useful table for NPT

http://www.engineeringtoolbox.com/npt-n...d_750.html

by **movnmik** on Tue Jan 26, 2010 2:52 pm

Update-

Able to get the machine hooked up to power and plumbed in.
Here is what I know - very limited electronics background (took a couple of years of it in highschool)

Cimbali Power switch is a 3 position switch. When switched all the way to the left (counterclockwise) the machine should be off (as indicated by the graphic)

However, the machine's front panel light is on. And that is the position that I put the switch in when I was testing the dosing buttons.

Once first powered on, the machine made a long beep. Nothing seemed to work, dosing buttons that is. I ended up switching the dip switches on the main board and was able to get the dosing buttons to work. But I continued to try dip switch positions (at times the machine was still powered) and now when I turn the machine on it activates both brew groups and the dosing buttons don't seem to work. I'm hoping I didn't screw something up royally when changing dip switch while powered on.

So I know the following
- Heater seems to work - water gets hotter
- Pump works - water coming out of the brew groups.
- Cup heater works - gets pretty darned hot
- Front panel lights but doesn't show any information
- The dosing pads work - well worked before I think I screwed up the main board.
- Seems that the power board works since the pump motor, heating elements and boards are getting electricity.

I'm really not sure where to begin and hope someone can offer a bit of direction.

Thanks

Mike

http://users.rcn.com/erics/ · by **erics** on Tue Jan 26, 2010 3:33 pm

Have you tried contacting La Cimbali USA? - For a wiring diagram etc. etc.
http://www.lacimbali.us/usa/contatti_network.asp?cerca_cosa=9&cerca_dove=88&cerca_dove_2=&invia=invia&page=&oxcitta=asc
You just might catch somebody in tech support that knows this machine inside/out electronically.

by **cyclones** on Wed Jan 27, 2010 4:07 am

Mike,

My understanding is that the dosing buttons normally don't work until the machine comes up to operating temperature and pressure.

Have you tried turning the machine off and resetting the DIP switch positions to their original settings? My understanding of the current situation is that when you turn the machine on, the valves for both groups open up and the pump kicks on; is that correct? I would recommend against flipping any DIP switches when the machine is powered.

Does yours have an LCD? I wasn't aware of that.

I did find this information with a little google searching...
http://coffeegeek.com/forums/espresso/machines/14611
It says you can put the machine in engineering mode by setting the DIPs to ON OFF ON ON. There you can program the shots. The post also seems to suggest that normally all the DIPs are set to ON.

I hope that helps.


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