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Trouble with new San Marco SM90
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zach1234
Senior Member


Joined: 21 Oct 2013
Posts: 6
Location: Denver, CO
Expertise: I like coffee

Posted Mon Oct 21, 2013, 8:30pm
Subject: Trouble with new San Marco SM90
 

Just got a (heavily used) SM90. Didn't pay much for it, so I was expecting some cleanup to be necessary.

Problem is that it doesn't start when the power button is pushed. Looking inside it doesn't appear there is much inside that could go wrong. Before I contact the seller I'm just wondering if there is something really easy I'm not seeing that could be wrong.

Thanks
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calblacksmith
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calblacksmith
Joined: 25 Nov 2007
Posts: 7,781
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Tue Oct 22, 2013, 8:45am
Subject: Re: Trouble with new San Marco SM90
 

Welcome to the board.

Grinders are a pretty simple device and you are correct, there isn't much to go wrong inside. Some grinders have a safety interlock and require the hopper to be in place. I have not used that particular grinder sorry.

For the most part, commercial grinders only need to get cleaned and new burrs. Was the grinder sold as working or did the very small print say as is where is LOL?

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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zach1234
Senior Member


Joined: 21 Oct 2013
Posts: 6
Location: Denver, CO
Expertise: I like coffee

Posted Tue Oct 22, 2013, 9:55am
Subject: Re: Trouble with new San Marco SM90
 

I found a little microswitch inside, though when I actuate it the grinder still won't start.
My first inclination would be to twist the wires for the microswitch and the power switch, since then all that would be left is the motor and capacitor. I'm a little hesitant to mess with the wiring just yet in case I have to send it back. (The seller has actually told me to let them know if I can't get it working and they'll make it right.)
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zach1234
Senior Member


Joined: 21 Oct 2013
Posts: 6
Location: Denver, CO
Expertise: I like coffee

Posted Tue Oct 22, 2013, 10:13am
Subject: Re: Trouble with new San Marco SM90
 

Success!
Thanks for the safety switch tip. Took out the micro switch and it purrs.
(Now just need to get the adjustment collar loose: searching around looks like some combination of solvent a hair dryer and a strap wrench should do it)
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zach1234
Senior Member


Joined: 21 Oct 2013
Posts: 6
Location: Denver, CO
Expertise: I like coffee

Posted Sun Nov 3, 2013, 10:05am
Subject: Re: Trouble with new San Marco SM90
 

I'm wondering about the burr alignment and the rigidity of the top burr carrier.
The wear isn't perfectly even all the way around (started with new burrs).

Also, I hit zero pretty quick to the point that if the beans aren't pretty fresh I can barely grind fine enough. If I lift up on the right side of the adjustment wheel/burr carrier I can get several more clicks before the burrs hit. It seems possible that used commercially with the hopper full of beans this wouldn't be a problem (I think it is the indexing switch pushing up on the opposite side that is making the carrier not sit straight).

Will I be off base to try wedging a wood shim under the right side of the carrier to get the burrs aligned (and eventually maybe remove the indexing switch if it is what is pushing too hard on one side). Another thought was to us a little teflon tape to take the play out of the threads.
Is this a secondary issue? Meaning, should I focus on other things first and come back to this? I've got a new (to me) machine (Astra Pro) and trying to dial it in. Even using WDT I'm still working to get rid of some channeling. So I'm sure I have other parts of the process that need a lot of work. Could this be adding to the channeling or is it just a red herring?
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zach1234
Senior Member


Joined: 21 Oct 2013
Posts: 6
Location: Denver, CO
Expertise: I like coffee

Posted Sun Nov 3, 2013, 12:02pm
Subject: Re: Trouble with new San Marco SM90
 

Here is a photo of the direction of wedging I'm thinking of (opposite the spring loaded index tap).

zach1234: 20131103_114550.jpg
(Click for larger image)
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