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| Reply To: | TechNet E-Mail Forum. |
| Date: | Tue, 23 Mar 2004 07:14:14 +0200 |
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Hi Russ,
In the past we used to had from time to time such phenomena. We found,that
the reason was not efficient rinsing living on the surface some residues
after drying.No enough to to spot them by ionic contamination tests, but
enough to create such high resistance short.We switched all final rinses
from tap water to DI water as well improved maintanance of converised
equipment.
Good lack.
Edward
Edward Szpruch
Eltek Ltd
P.O.Box 159 ; 49101 Petah Tikva Israel
Tel ++972 3 9395050 , Fax ++972 3 9309581
e-mail [log in to unmask]
> -----Original Message-----
> From: Russell Burdick [SMTP:[log in to unmask]]
> Sent: ב מרץ 22 2004 23:38
> To: [log in to unmask]
> Subject: [TN] high resistance shorts
>
> Here's a question for all you electrical fans...( ha, ha, ha, not those
> type
> of shorts)
>
> We are getting high resistance shorting on multilayer polyimide only
> boards.
> Inner layers test out with no problem. Immediately after outer layer etch
> there are the shorts. Omega meter testing shows no ionic contamination at
> this stage. Baking prior to ET reduces the number of shorts, although
> after
> a few days the shorts are back. Construction of board is foil copper at
> lamination, not cap-core.
>
> As usual, any and all help is greatly appreciated.
>
> Russ
>
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