PLAN B analog blog

Hi Peter and Bryan,
I had also difficulties with the tracking of both Model 15s, until
I changed the location from a Doepfer rack with PSU 1 to one with PSU 2.
With PSU 2 racks I have to calibrate them one time in month to arange a 
very fine tuning.
Maybe this wil be a hint?
best regards
Axel

Bryan E Cornell schrieb:
> Peter Grenader added comments in line:
>
>   
>>>> 1) When you are calbrating, are you doing so with the same power
>>>>         
> supply it's >>>powered with when it's in the rack?
> Yes, I leave it connected, but just loosen the screws and pull it out
> of the Doepfer (G6) rack far enough to access the tracking pot.  I need
> a screwdriver to pry it out, it's so wedged in there.  
>
> PG:  ThIs sounds like it has more to do with the faceplate width.   The width of a M15 faceplate is 3.985 inches, plus or minus .005" - that works out to about 91MM.  Pleae check yours. 
>
> Unfortunatley, all I have to check it with is a relatively cheap guitar
> tuner.  Could the tuner be nutty?  Seems to work for my guitar and bass.
>  
>
>   
>>>> 2) Who's rack are you using?
>>>>         
> See above.  Can't remember if it's the psu1 or psu2 power supply, but
> I'll check this as well.  On the Doepfer list I saw a post by a guy
> complaining about how his modules didn't quite fit in the G6 rack right,
> and mine is definitely like this (I have another Doepfer suitcase rack
> where all the modules fit perfectly.)  
>
> PG:  Do all the modules have aproblem with fit, or just ours?
>
> Perhaps there was a quality
> control issue with a batch of the G6 frames.  I mention this * and,
> again, I'll double check this tonight tax god's permitting * because
> it seems the pcb on the Model 15 was touching something on the adjacent
> module.  
>
> PG:  this is really weird.  What are the adjecent modules?  The left hand side of the M15 PCB clears the edge of the faceplate by 1 cm - well enough not to present a problem (and this has never com up before).  On the other side it's even greater.
>
> If the solder traces are touching some metal part on a nearby
> module, couldn't this cause difficulties?  
>
> PG:  Big time.
>
> I believe the adjacent module
> is a Model 12.
>
> PG:  This can't be the proble then.  THe moel 12 PCBs are the same dimension form the faceplate edge.
>
>
>
> I'll do some more sleuthing and report back.
>
> PG:  Cool!
>
>
>
> Bryan
>
>
>   
>>>> "Bryan E Cornell" <bcor@loc.gov> 04/16/07 2:38 PM >>>
>>>>         
> >From Peter Grenader:
>
> Regardig your comment below.  THis is a new one on me.  I have
> questions, then I can answer yours:
>
> 1) When you are calbrating, are you doing so with the same power supply
> it's powered with when it's in the rack?
>
> 2) Who's rack are you using?
>
> Is it home built?
>
> If so....does it have metal rails in which to mount the modules?
>
> If not, have you provided a means to GROUND the faceplates when they
> are mounted in the system?
>
> Please let me know. WIth over 300 shipped, I've never heard of this
> problem.  Can anyone else lend any similar experiences?  NOw's a real
> good time to take care of problems - more infor on this in the next
> couple of weeks.
>
> - P
>
> Original message form Bryan Cornell:
>
>
> I'm having a devil of a time getting the tracking set on my Model 15. 
> I've followed the directions from the Plan B yahoo groups and it
> works.... at least at first.  I get the scaling perfect, but then when I
> mount it back in the cabinet, the scaling is screwed up again.  How can
> this be?
>
> I have a Doepfer rack and everything seems to work fine, except the
> module for some reason are a really tight fit in the cabinet.  I'm not
> sure if this is because the rails are really tight or because some of
> the modules are not the exactly the right size.
>
> Any clues on this would be much appreciated. Could something be
> touching the Model 15 circuit board and causing this?
>
> Bryan
>
>
>
>  
> Yahoo! Groups Links
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