Dear Badri,

If you specified 70/70/70/70 microns of copper and referred to IPC-A-600G
for acceptability, then you return the boards to the manufacturer. He should
replace them with what you ordered. 
As you are at it, you should check the copper thickness within the holes
that are connecting to the inner layers to make sure there is enough Copper
plating to enable electrical conduction of high power as well. Typically 30
microns plating as 20 won't usually do. 

As for the assembled parts, see how to negotiate with your supplier if he is
faulty.

For this type of PCBs, there more to check as well

But IMO, your RFQ and the order itself should have the details of the
specific spelled out for your supplier. 


Meilleures Salutations
Very Best Regards
Roland
 
www.PCBspecialist.com 
Roland Jaquet
14 Champ Budin
1258 Perly, GENEVA
SWTZERLAND
GSM+41-79-203-3723
"Quality is best measured not by the return of the products but by the
return of the customers"

-----Message d'origine-----
De : TechNet [mailto:[log in to unmask]] De la part de badri
Envoyé : mercredi, 7. novembre 2007 08:36
À : [log in to unmask]
Objet : Re: [TN] Delamination of lead free PCBs

Dear Technetters,

During production of the XXXX boards, we found that that the inner tracks
were getting opened(discontinuity) and nearly 50% of the boards were failing
during the testing.

On further analysis we found that the copper thickness of the inner layers
were less when compared to the outer layers. On confirmation with PCB
supplier we found that the Finish Cu thickness was maintained at 70/35/35/70
micron whereas our gerbers sent to supplier calls for 70/70/70/70 micron.

The issue was discussed with our customer and they informed that they cannot
accept the boards since they are using the boards for a high power
applications(2.5KVA) and the tracks cannot withstand this kind of voltage
which will cause field failures.

Please find the below information of the PCBs and the PCBAs which has to be
scrapped because of this.

Assembled 50nos 

Assembled 110nos
 
 

We and our customer are now in a very desparate situation and we need to
turn up ASAP. Now the details are as follows:

Process: ROHS
Usage: UPS
No. of layers: 4

How do I salvage the assembled boards?

Thanx
Badri


 

Thanks&Regards,

Dinesh

 
















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