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Subject: RS274X gerbers don't show copper
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dc32178759
Posts: 5
Online: User is Offline
10/30/2007 7:58 AM  
I have a recent design that exhibits very strange behavior.  I am generating artwork in RS274X format. When I view the the individual films inside Allegro, all layers look as they should. However, when I try to validate the artwork in a thrid party tool, the copper layers are empty/blank. The odb++ works just fine, all the copper is there. But in two different gerber tools, the copper layers don't show up when I try to view the gerbers. I imported a film_setup file that I just used on a production board with no issues what so ever, but the new file in question still exhibits this strange behavior. It seems it may be a seeting in the brd file database that is incorrectly set, but I cannot find anythign that looks out of place. Has anyone seen this before? Does anyone have any ideas/suggestions that may solve this issue?

Thanks in advance,
DC
kp
Posts: 53
Online: User is Offline
10/31/2007 5:56 AM  
Is it just the certain copper layers or all of them?

What about the silks / soldermask are they blank also?

KP
dc32178759
Posts: 5
Online: User is Offline
10/31/2007 7:34 AM  
Hello KP,
It's only the copper layers. All the other layers, silk, paste, mask and assembly all are fine. THey are jsut as you would expect them to be.
satya1234
Posts: 0
Online: User is Offline
10/31/2007 8:22 AM  
Is they are positive planes or negative planes?If it is negative planes you will get reverse image( in gerber tool )of what actually you see in data base.Make it positive in gerber tool you will get actual image.
I hope this solves your problem.

Regards
Satya .
AT&S ECAD.
dc32178759
Posts: 5
Online: User is Offline
10/31/2007 8:56 AM  
Hello Satya,
   All the planes are positive in the database, and I generate all layers as positive.

Thx,
DC
kp
Posts: 53
Online: User is Offline
10/31/2007 11:12 AM  
Can you post a screenshot of a sample film record and setting along with a cross-section

KP
dc32178759
Posts: 5
Online: User is Offline
11/01/2007 8:51 AM  
Hello KP,
My last post with the screen shots did not make it to the forum, the file size was too large. So, I am re-sending as a pdf. The pdf consists of the x-section screen shot, and the film set up for layer 2, which is a plane layer.
Thanks for taking a look at these.

DC

Attachment: FILMSET.pdf
Trykon
Posts: 58
Online: User is Offline
11/01/2007 8:58 AM  
Is that offset (X 10,000 Y 10,000) in each of the film records?
dc32178759
Posts: 5
Online: User is Offline
11/01/2007 9:04 AM  
Hello Trykon,
Yes, all of the films have the 10,000 offset. This seems to keep the layers aligned usually.

DC
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Forums > Silicon-package-board > PCB Design > RS274X gerbers don't show copper


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