Electronics Forum | Wed Jul 16 10:36:16 EDT 2008 | mrmaint
We use a "gold" board to verify the performance of the oven. We chose a scrap board, ran it thru a known good profile and saved the results. We have permanently attached the thermocouples to the board so there is no variance as to where you place the
Electronics Forum | Fri Jun 29 07:47:16 EDT 2012 | mosborne1
Dave Thanks for the input. The thermocouple read 244 on the pad of the socket. We actually found after extensive investigation that it is the coplanarity of the leads. We were shipped a bad batch of sockets form the manufacture. Go figure!!1
Electronics Forum | Wed Aug 16 16:43:47 EDT 2000 | Steve Thomas
O.K., I give up. I am through trying to solder thermocouples on to 20 mil pitch QFPs. Whether it's my lousy technique (fairly likely), the wrong solder (Kester calls it thermocouple solder, and who am I to argue...it's a Sn10Pb88Ag2 alloy) or just
Electronics Forum | Thu Feb 16 10:12:21 EST 2006 | slthomas
"Readings from thermocouple fixed by kapton tape only are inaccurate." I keep hearing this, but I haven't heard why, exactly. Why would they be any less accurate than with Al tape, which by nature of it's conductivity can provide an inaccurate measu
Electronics Forum | Mon Apr 05 17:22:14 EDT 2004 | davef
Frank Zomber Ren� advised "Chomerics T405" above in this thread http://www.smtnet.com/Forums/Index.cfm?CFApp=1&Message_ID=27744 Searching the fine SMTnet Archives will give contacts, like: http://www.smtnet.com//forums/index.cfm?fuseaction=view_t
Electronics Forum | Mon Sep 27 16:52:48 EDT 2021 | aex
During production the temperatures on the last 3 zones are approx. 20F higher than the setpoint. The other zones are operating within spec. We checked power, I/O, SSR's, thermocouples, and exhaust, but the issue remains. We did not check resista
Electronics Forum | Sat Apr 30 13:56:31 EDT 2005 | steve
My experience with different size boards and pre-heaters. The perfect world (right?) you would saturate the complete pcb with bottom pre-heat. But it is difficult with repair and rework equipment, not to mention the expense and foot print of large pr
Electronics Forum | Tue Mar 13 11:50:21 EST 2001 | gsmguru
Here is some general things I usually ask myself when having trouble with BGA's What type of BGA ? Pitch/Bump Dia etc. Smaller bumps sizes & tighter pitches require more attention. This also impacts stencil aperature design & paste selection. Was
Electronics Forum | Tue Feb 19 12:28:26 EST 2019 | slthomas
Presumably you're talking about lead free, but you don't say. Heller can probably provide you with a starting point, as rob has already pointed out, but you do need to develop the capability to perform profiling yourself. That oven should have ECD
Electronics Forum | Fri Nov 22 17:55:39 EST 2002 | robertorre
Your problem may be related to different aspects. 1. Oxidation on landing pads. 2. Either high(To long over liquidous temp) or low temp. 3. Bad solder (not enough vehicles) Run this test: Set a hot plate to 220 degrees C. Make sure you have proper ve
