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February 2000

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Subject:
From:
"Ingemar Hernefjord (EMW)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 25 Feb 2000 08:59:11 +0100
Content-Type:
text/plain
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text/plain (78 lines)
Agree with Steve,
we mount thousands of resonators, different kinds, size and purpose. Other tips are:
-dewetting, have a look at the resonator's finish
-gas bubbles that can't escape, causing faint solder joints
-no wetting, make globule test or similar
-insufficient solder
-shaky soldering, disturbs solidification
-puck to heavy, does not let in flux and correct process,make small distance
not easy to say more without an idea of your situation.
Last chance: ask Paul Klasek, but you need a decrypting machine (he-he)
Ingemar


-----Original Message-----
From: Stephen R. Gregory [mailto:[log in to unmask]]
Sent: den 24 februari 2000 19:45
To: [log in to unmask]
Subject: Re: [TN] Resonator soldering problem


In a message dated 02/24/2000 12:26:51 PM Central Standard Time, 
[log in to unmask] writes:

<< I have this Resonator part that is very large and sets on the top of the 
PCB and
 goes through our convection reflow oven at 220 C. Board is very complex and 
the
 problem we are having is that only the edges are being soldered and when we
 cross-section to inspect solder under part it is still uncured. We discovered
 this problem when parts started falling off PCB.
 
 Any and all comments welcomed. What we would like to know is if any one else 
is
 using this part and have they solved this problem..
 
 Steve >>

Hi Steve!

Can you tell us a little more about this part? I mean how large is very 
large? Is it a ceramic part? Also when you say the board is going through the 
oven at 220º C., where exactly is that temperature measured on the board? 
What kind of solder alloy are you using...a 63/37? If so, then if the 
resonator location is seeing 220º C., there should be no problem. Sounds to 
me like a good temperature profile plot needs to be done with a thermocouple 
placed at the resonator terminals...seems to me that there's not enough 
calories to reflow the solder...

-Steve Gregory-

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