Careful what you say, Jack. Your first paragraph indicates standards are
on the bottom of the totem pole. If we violate ANYTHING in Mil-PRF-55110
or Mil-PRF-31032 regardless of what the procuring activity states, we
cannot certify the boards to any of these specs WITHOUT approval from
the qualifying activity.
Rick Howieson
GTC
>-----Original Message-----
>From: Jack Crawford [SMTP:[log in to unmask]]
>Sent: Wednesday, March 08, 2000 4:37 PM
>To: [log in to unmask]
>Subject: Re: [TN] Running of Jumper wire...
>
>When referencing standards, it is also important to remember that there is an
>order of precedence in requirements. Words of a contract/purchase agreement
>rule first, followed by approved drawings, followed by the standard. So
>anything agreed to by customer/supplier (and of course product engineers)
>would take precedence over the 610 requirement.
>
>Second is a bit of good news about jumper wire guidelines in IPC-7721 Repair
>and Modification of Printed Boards and Electronic Assemblies. Procedures 6.1
>and 6.2.1 (both about jumpers) are at the printer and will be mailed to
>everyone that has purchased an IPC-7721 and returned their registration card.
> There are a couple of other procedures that had tweaks, the acknowledgment
>pages now include those people whose last name starts with the letter C (ok,
>we goofed the first time), and of course the Table of Contents pages had to
>be updated.
>
>The developing task groups for the repair and rework guides will be meeting
>next week at APEX (www.apex2000.org) to continue work on some additional
>procedures.
>
>The IPC Repairability Subcommittee 7-34 is lead by Jeff Ferry, Circuit
>Technology Center, and Dan Foster, Electronic Training Advantage.
>
>The Repair and Modification Task Group 7-34a (IPC-7721 Repair and
>Modification of Printed Boards and Electronic Assemblies) is chaired by Jeff
>Ferry, Circuit Technology Center.
>
>The Component Removal and REplacement Task Group 7-34b (IPC-7711 Rework of
>Electronic Assemblies) is chaired by Dan Foster, Electronic Training
>Advantage, with Vice-Chair Peggi Blakley, Naval Surface Warfare Center -
>Crane Div.
>
>>>> Bill Butman <[log in to unmask]> 03/08/00 04:19PM >>>
>Hi Ken,
>
>As they say in the movies: "here is my 2 cents".
>
>IPC-610C, Section 11.2.3, last paragraph prohibits
>wires, or staking tape, or adhesive from overhanging
>the edge of the PCB. Thus, running a wire from one
>side of a PCB to the other, (over the edge) will
>violate this section.
>
>I understand the update of IPC-7721 will have a
>section on jumper wires that explains how to use
>"non-used" plated through holes for routing wires from
>one side to the other. And the update will also
>document a method for drilling and sleeving a hole for
>the same purpose. (We use these techniques
>occasionally.)
>
>You can find these documented procedures at the
>circuittechctr.com, web site. The procedures are in
>our "guides" section (bottom of home page), section
>6.
>
>I agree with Ed Valentine, if you have a unused
>through pin or lead, use it. If I were going to use
>a unused lead on a DIP, I'd isolate it from the
>component first.
>
>I have no experience using an "edge clip".
>
>I'll be interested to know how you solve your dilemma.
>
>thanx
>
>Bill
>
>--- "Edward J. Valentine" <[log in to unmask]>
>wrote:
>> Ken - Can you use an edge clip? Or, if you have an
>> unused pin on a DIP, use
>> that? There may be other "creative" options, but it
>> would depend on your
>> layout among other factors. Food for thought,
>> anyways.
>>
>> Ed Valentine
>> Electronics Manufacturing Solutions
>> 8612 Mourning Dove Road, Raleigh, NC 27615
>> Phone: (919) 270-5145, Fax: (919) 847-9971
>> Email: [log in to unmask]
>> Website: http://www.ems-consulting.com
>>
>> ----- Original Message -----
>> From: Ken Patel <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Tuesday, March 07, 2000 7:29 PM
>> Subject: [TN] Running of Jumper wire...
>>
>>
>> > Guys,
>> > Does IPC call out running a jumper wire at the
>> edge to take on the other
>> > side? I personally think no. We do not have holes
>> in the board to run it
>> on
>> > the other side.
>> >
>> > Does anyone has any inputs on the matter?
>> >
>> > re,
>> > Ken Patel
>> >
>_______________________________________________
>> > Ken Patel Phone: (408)
>> 490-6804
>> > 1708 McCarthy Blvd. Fax: (408)
>> 490-6859
>> > Milpitas, CA 95035 Beeper: (888)
>> 769-1808
>
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