Hope,

The correct answer is.

According to IPC-D-325A, 1995, Page 76 Section 10.8:
------
Schematic diagrams.....Reference designators shall be assigned from
left to right, top to bottom, prior to back-annotation.
------
But I agree that on the board they need to be renumbered LRTB.
This maks it easier to find components on the PWB.

Regards,

                Jerry Schwartz, CID
                IPC Certified Interconnect Designer
                "May the Schwartz be with you"

###################################################
# Jerry Schwartz,CID         Designer 3           #
# Harris Corporation AGCS    Voice (407)-727-5474 #
# P.O. Box 91000, MS 1/5852  Fax   (407)-729-5990 #
# Melbourne, FL 32902-9100   Pager (407)-690-9797 #
# mailto:[log in to unmask]               #
# http://harris.com                               #
###################################################
"If you trust no man, then no man will ever
disappoint you." (Author unknown.)




> MIME-Version: 1.0
> Date: Wed, 20 Oct 1999 12:25:42 -0400
> From: "Dallara, Louis T (Louis)" <[log in to unmask]>
> Subject: Re: [DC] component numbering
> X-To: Hope Lariosa <[log in to unmask]>
> To: [log in to unmask]
>
>      Left to right and then top to bottom..
>      Lou
>
> > ----------
> > From:         Hope Lariosa[SMTP:[log in to unmask]]
> > Reply To:     DesignerCouncil E-Mail Forum.;Hope Lariosa
> > Sent:         Wednesday, October 20, 1999 12:09 PM
> > To:   [log in to unmask]
> > Subject:      [DC] component numbering
> >
> > Is there a 'standard' on how to number components?
> >
> > I'm referring to the way reference designators for components are placed.
> > If people (engineer, designer, assembler, technician) want to see a Right,
> > Down method, would that apply to the schematic or the board?  If there is
> > no stanrdard, I'm sure it all boils down to whatever the people involved
> > agree upon.
> >
> > I was wondering what the popular concensus is...anyone?
> >