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May 2006

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Subject:
From:
Jack Crawford <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Jack Crawford <[log in to unmask]>
Date:
Wed, 17 May 2006 14:03:35 -0500
Content-Type:
text/plain
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text/plain (121 lines)
Wee Mei, if I understand what you are looking for, it is in several
places in the original IPC/WHMA-A-620.

Clause 9.4.4 Connector Damage - Contacts <not the most intuitive header>
has criteria for inserted connector contacts. In Revision A "damage" and
"installation" are separated with installation now Clause 9.5

Clause 13.8 Center Pin Position <coaxial connector section> In Revision
A this is now 13.9.

620A
9.5 Installation of Contacts and Sealing Plugs into Connectors 

Contacts retention (seating/locking) shall be verified with a
non-destructive process appropriate to the connector in use, such as
visually through an inspection window. Verification shall be
accomplished prior to addition of any restraining devices.

Unused contact locations shall be filled with contacts and/or plugs if
specified on the documentation. The contacts are not crimped unless
required for insertion. 

Exceptions to retention verification include: 
*Prewired molded connectors.
*Potted or molded connectors after molding/potting.
*Solder cup connectors.
*Connector contact lead ends that are soldered into position.
*Connector contact locking device that is visible through an inspection
window.

Acceptable - Class 1,2,3
*All connector contacts are seated and locked into position.
*All locations in connector have been filled (if required). 

Defect - Class 1,2,3
*Contact is not seated as visible through inspection window.
*Pin or socket is not seated and locked.
*Contact(s) missing when unused positions are required to be filled.

13.9 Center Pin Position
The location of the center conductor's connector contact is critical to
meeting the electrical signal's integrity requirements. In the case of
"fixed" coaxial cable center conductor contacts, the position of the
center contact is determined by the design of the connector, and the
assembly process generally minimally affects the position of the center
conductor's contact. The position of "Floating" center conductor
contacts is greatly affected by the assembly, primarily due to shield
termination and wire preparation cut/trim lengths. Refer to
manufacturer's assembly specifications.

Target- Class 1,2,3
*Center pin fully seated into housing of connector.

Defect - Class 1,2,3
*Center pin not fully seated into housing of connector.
*Center pin is bent (not shown).
*Center pin extends beyond proper height (not shown).

Is this the kind of criteria you are looking for?

The 620 committee had a teleconference this morning to resolve some
comments received during ballot. Rev A will be going out for 2nd 30-day
ballot by Friday of this week, publication target early July.

Jack

Jack Crawford, IOM
IPC Director Certification and Assembly Technology 
[log in to unmask] 
847-597-2893 
FAX  847-615-5693 
3000 Lakeside Drive, Suite 309 S
Bannockburn, IL, 60015

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lum Wee Mei
Sent: Tuesday, May 16, 2006 9:19 PM
To: [log in to unmask]
Subject: [TN] IPC 620

Hello,

I flipped through the whole of IPC 620 but did not find anything about
insertion pin height. I remember in the old MIL std, it mentioned that
inserted pin must ensure to have level height to consider acceptable. Is
this criteria no longer important?

The reason I asked is because we come across some connectors have their
inserted pins being pulled back into the socket after the wires are
tighten. Should it not consider reject? If such connectors with sunken
pins are plugged into their mating part, the connectivity will be a
problem

For your kind advice.

Thanks and regards,
Wee Mei

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