Lou,

The procedures suggested are the accepted means of correcting this condition. 
However, keep in mind the higher density of the nomenclature on today's designs.
Your may want your supplier(s) to be a little more selective as indiscriminate 
removal of nomenclature may raise legibility issues.

KJ

______________________________ Reply Separator _________________________________
Subject: Re: FAB:  Silk-screen ink on surface mount pads
Author:  JMONAGHAN at hadcoderry
Date:    5/29/96 07:36 AM


[log in to unmask] wrote:
> 
> Recently I have seen PC boards with silk screen ink on surface mount
> pads.  Is any of this allowed?  Looking at the PC board IPC standards, I 
> don't see this subject addressed.  May I have some guidance?
> Lou Hart   412-858-6117
> 
> .I am not sure about I.P.C standards but it is not recomended. 
Your board manufacturer should take care of this for you. 
Being involved in the photo dept and plotting end of board 
manufacturing we do not allow screening to land on any pad or surface 
mount area.
To avoid this
- using your plotter ,plot your soldermask as a negative on top of your 
silk screen
-on the cam ,use the clear silkscreen option using appropriate mask to 
clear yor silk
-in darkroom shoot a negative of your silkscreen and a positive of the 
soldermask.  merge them togeather using a contact in the dark room
you will be left with a positive of your silkscreen with pad and surface 
mount free of ink.(the old but still works way)
-