Solder reflow oven
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SOLDER REFLOW OVEN PROFESSIONAL
Professional assembly is rarely a feasible option: it is surprisingly expensive, especially for small quantities, and coordinating with the assembly house can be awkward if you are trying to use whatever stray components you have lying around your lab/office/garage/bedroom. Hand soldering is becoming increasingly burdensome-sometimes impossible-owing to the proliferation of miniscule components, leadless packages, and ball-grid arrays. This temperature feedback will enable you, the assembly technician, to accurately control the oven’s heating profile via simple, real-time adjustments.Īs you may know, surface-mount assembly can be a serious impediment for students, hobbyists, entrepreneurs, or anyone else who wants to design and test high-performance circuit boards without paying for professional assembly. In short, the system displays the current temperature and a graph representing the temperature history, as follows:
SOLDER REFLOW OVEN HOW TO
That article tells you how to build and use the system, and it provides links for downloading the microcontroller code and the Scilab script. In a previous article ( Make an EFM8-Based System for Monitoring and Analyzing Thermocouple Measurements), we developed an EFM8-and-Scilab-based system for collecting, recording, and displaying thermocouple temperature measurements. I let mine sit on a stove burner to finish cooling, they can take high heat.With the help of a DIY thermocouple measurement system, you can use a cheap toaster oven to accurately reproduce a reflow-soldering temperature profile. Let the tray cool some more, then remove the tray and let it cool fully. When the temp drops below 180C, smoothly open the door fully. Turn the heat off, open the door a little to let the heat start escaping slowly. 205C is important, quite a few parts show 205C as their never exceed temperature. Start the heat again: turn temp to high, back it off when it hits 185C, work the heat on & off, keeping it above 185C and below 205C, for 90 seconds. Start the heat: turn temp to high, back it off when it hits 145C, the oven will continue heating a little, let it settle around 150C. The toaster oven is an ancient Sears toaster oven with 4 heating elements, and a tray to place the boards on. I place the probe to sit just above the boards, the door closing holds it in place. I've gotten a lot of use out of that probe. Purchased at my 'local' electronics supply store for around $40. I have a multimeter with thermocouple probe, Extech EX330. I manually reflow also using Kester EP256, Temps are way too high and times are too long. None of the other components (including the one shown) required resoldering. I resoldered the USB micro receptacle and the board now works. The I'm also still getting the error "Device not responding to setup address." in the Linux kernel ring buffer. I'm having some trouble getting more of the flux off than this using a toothbrush and isopropyl alcohol. Here's the same component after cleaning. Does that mean that my ramp rate is too high, or I didn't hold the temperature at about 150C for long enough? The other mistake I may have made is I only took the solder paste out of the fridge for about 1 hour before soldering.ĭo these diagnoses sound accurate? Anything else that comes to mind? I hope the image is sufficiently clear, but if not let me know what is unclear and I will see if I can take a better picture to satisfy those criteria. For instance, it looks like there might be some mild solder-bridging from solder-ball formation (note that the top left two pins should be bridged). However, I wonder if I might have made other mistakes as well. The obvious first mistake I made is to let the temperature get above 235C. However, my oven exceeded the max temperature and got up to 247C before I opened the door. My solder temperature profile is (using Sn63/Pb37 ChipQuik solder paste): I'm trying to diagnose what went wrong in order to solder this correctly the next time. As you can see in the image below, I botched the job and burned the solder connections (not surprisingly, the board does not work). I made a homemade reflow oven and used it for the first time to solder a board.