Alembic Guitars Club

Alembic products => Owning an Alembic => Troubleshooting => Topic started by: cactustone on February 09, 2014, 04:55:01 PM

Title: SF-2 Superfilter died, but green light still works
Post by: cactustone on February 09, 2014, 04:55:01 PM

I was playing through my SF-2 the other night (used as a pre-amp and feeding my Eden WT-800) and it just sort of died.  There was very muted signal still coming through, but something had clearly gone wrong.  The green LED was still on, so the unit was getting power.
 
I read Mica's note in the FAQ about polarity, so I double checked to make sure that the adapter I was using was center positive--and it was.  So I don't think polarity is the issue.  Anyone know what the issue might be and how I fix it? Thanks!

Title: SF-2 Superfilter died, but green light still works
Post by: smokin_dave on February 09, 2014, 07:38:37 PM

Same thing happened to me and an input jack had failed on mine.Sent it back to the Mothership they fixed the problem and all was well with the world again.

Title: SF-2 Superfilter died, but green light still works
Post by: smokin_dave on February 09, 2014, 07:43:16 PM

(Message edited by smokin dave on February 09, 2014)
 
(Message edited by smokin dave on February 09, 2014)

Title: SF-2 Superfilter died, but green light still works
Post by: gtrguy on February 09, 2014, 08:19:54 PM

If I remember right, they have a simple resister on the board that doubles as a sort of fuse and will blow if the wrong AC adapter is used or something else goes wrong. You can open it up and look at the resisters and it may well be obvious that it fried up.

Title: SF-2 Superfilter died, but green light still works
Post by: mica on February 10, 2014, 02:08:37 PM

In that post about the reversed polarity I point to a small inductor that will blow if something is awry with the power. Check that part.

Title: SF-2 Superfilter died, but green light still works
Post by: cactustone on February 14, 2014, 01:02:47 PM

Mica, so even if the polarity is correct(as it is), the blown inductor could be the problem?  
 
Thanks!

Title: SF-2 Superfilter died, but green light still works
Post by: mica on February 14, 2014, 01:42:58 PM

Well the light is on but nobody's home! It seems sounds to check it. I'm aware you are using the correct polarity, is the voltage also within the printed range of 10.5-17.5 V?

Title: SF-2 Superfilter died, but green light still works
Post by: cactustone on February 14, 2014, 01:52:51 PM

Thanks, mica!  I'll double check the voltage, but I think it's correct.  Gonna check everything out tomorrow.

Title: SF-2 Superfilter died, but green light still works
Post by: cactustone on February 27, 2014, 11:48:18 AM

Hi Mica,  could you point me to the exact replacement part i would need for the blown choke?  I don't know yet that this is the problem, but I'm going to try a fix.  I just can't figure out which part to use.  Thanks!

Title: SF-2 Superfilter died, but green light still works
Post by: cactustone on March 04, 2014, 04:10:38 PM

anyone?  I just want to know what replacement part to buy.  Thanks!

Title: SF-2 Superfilter died, but green light still works
Post by: mica on March 04, 2014, 05:10:27 PM

It's a 47mH choke in location L3 on the main board. In the FAQ  here (http://club.alembic.com/index.php?topic=262) but I see now that the hex tool I'm pointing to in the picture is not easy to see which part I'm pointing to. Sorry about that.  
 
You're also welcome to send your SF-2 in for repair. There is no charge to diagnose the problem. Email me directly if you want to arrange this.