There're no standards on misprinting as this is not a final  
workmanship/quality issue...rather a process issue...I'm sure  
engineers do set their own guidelines if you utilize an AOI or  
automated printing inspection system, depending on what type of  
component you're looking at...say, a 20-mil vs a 40-mil pitch QFP. But  
you're right, especially for high volume runs, controlling the  
printing can reduce a large portion of your defects and time lost.

Andy

Quoting John Goulet <[log in to unmask]>:

> I've never heard of one. The IPC standard is for component   
> placement. Occassionally we may have the aperatures longer to print   
> off the pad on purpose to have more paste flow up the leads.
> I put in a 1st peice inspection sheet for print, placement and the   
> paste used to assure at each changeover the process was good. This   
> prevents most of the misprints unless I get my finger in it during   
> inspection. Now that the operators know we are watching, the quality  
>  has gone up substantially. If the camera gets out of calibration   
> then the prints can go off. The manaul printers are doing better and  
>  stencil issues are caught much sooner before they cause a stop   
> process.
>
>
> -------------- Original message --------------
> From: Yannick Brisson <[log in to unmask]>
>
>> Hi everyone!!
>>
>> Is anybody have a chart or rule or standard for misprint. What I mean is if
>> there is a way of saying if my print for some reason a switch 1%,   
>> 5%, 10%, etc,
>> off the pad that is not acceptable.
>>
>> Thank you
>> Yannick
>>
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