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October 1999

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Subject:
From:
Matthias Mansfeld <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Sat, 9 Oct 1999 03:14:42 +0200
Content-Type:
text/plain
Parts/Attachments:
text/plain (58 lines)
A customer of mine who manufactures mostly class 2 or 3 products has
(or had) the following procedure:

They define two own classes for PWBs and assemblies. The
"lower" class refers to in-house standards, IEC359 and DIN IEC 326,
the "higher" to MIL-P-46843, -P-55110, -STD-275, -STD-454, and
DOD-STD-2000-1 to -4.

The copy of the jumper wire procedure itself is from 1991, and I
assume they have meanwhile these definitions updated to IPC-222x and
other newer standards.

The "lower" class has the following rules:

a) max numbers of ALL repairs, added components, jumper wires etc.
PCB size in cm^2    number
< 100:     5
100-300:  10
300-600:  15
> 600:    20

b) jumper wires and added components
< 100:     3
100-300:   6
300-600:   9
> 600:    12

The "higher" class allows no repairs.

For repair they refer to IPC-R-700 and MIL-C-28809, but mostly to
other in-house procedures.

Hope this helps.

Regards
Matthias Mansfeld
-----------------------------------------------
Matthias Mansfeld Elektronik
* Printed Circuit Board Design and Assembly
Am Langhoelzl 11, D-85540 Haar, GERMANY
Phone: +49-89-4620 0937, Fax: +49-89-4620 0938
E-Mail: [log in to unmask]
Internet: http://www.mansfeld-elektronik.de

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