As fine with good solderer, JF, you must have discrete reasons for the
wiring , which I can not see from here .
Sufficient is (as you know) pending your technician's "feel" for the
materials and CTE's . Should do, generally .

pk

-----Original Message-----
From: Jean-Francois Bissonnette [mailto:[log in to unmask]]
Sent: Tuesday, 7 December 1999 8:57
To: [log in to unmask]
Subject: Re: [TN] component replacement on board (re-post)





> -----Original Message-----
> From: TechNet [ mailto:[log in to unmask] <mailto:[log in to unmask]> ]On Behalf
Of Paul Klasek
> Sent: Friday, November 26, 1999 5:18 PM
> To: [log in to unmask]
> Subject: Re: [TN] component replacement on board (re-post)
>
>
> So : doubt you find any "mod book bible" ; it's all too case specific .
>
> Otherwise, scanning clamping diode quick fixes in my vibrated
> past (railway
> cards):
>
> You're quite correct J-F, the piggyback soldering is not as good as :
> let the res. going through pads with long (full) legs, drop the diode legs
> through drilled holes,
> press bend in res. direction, loop back diode wire 180 degrees around the
> res. wire (= on pad) which you bend back to hook the diode wire loops .
> Trim, cover possible excessive wire with solder resist and wave .

Just a confirmation please:  I'm not going to pass that to the wave
soldering.  It's
an hand made rework.  Does bounding this diode to the board sufficiant to do
the job?

I wont hook the diode and the resistor together.  Discreete wiring is planed
to be used.

>
> That way you get flat secure joint anchored on pad .
>
> cu
>
> Paul Klasek
> ResMed
>
>
> -----Original Message-----
> From: Jean-Francois Bissonnette [ mailto:[log in to unmask]
<mailto:[log in to unmask]> ]
> Sent: Saturday, 27 November 1999 5:30
> To: [log in to unmask]
> Subject: [TN] componant replacement on board (re-post)
>
>
> This is a message that I sent on thanksgiving day.  I just wanted to make
> sure
> it was not forgoten!
>
> Hi!
>
> We have an important modification on a board and some advice would be
> appreciated.
>
> Nature of the modification:
>
> A diode (do-41 casing) as to be added to a circuit in parallel to
> a resistor
> (1/2 W).
> Is there any specs on how such a modification should be done?
>
> I was thinking of drilling holes for the diode as it had a place near the
> resistor.
> Then I would bound the diode so it stays in place and connect the resistor
> and the
> diode with some wiring on the solder side.  The board as no power
> planes nor
> ground
> planes.  Of course, the electrical clearance would be respected.
>
> Is there any other way that would be generaly prefered in the industry?
> Such as
> soldering the diode on top of the resistor (witch I doubt) or
> anything else.
> And is
> there an IPC book on such kind of modification?
>
> Thank You!
>
> Jean-Francois
>
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