![]() ![]() Do not store cold pack solder paste in a refrigerator used for food and never store room temperature solder jars in a refrigerator.Verify that all components can be processed using a standard SMT process as described in this procedure. Some SMT components have restricted thermal process requirements.Oven is hot, use insulated gloves and safety glasses while working around hot equipment.Do not use a toaster oven to prepare foods after it has been used for solder paste reflow.Melts, let cool and inspect the solder joints. Remove the PCB after the temperature stick mark To suggest any would only confuse the issue and could actually hurt, There just isn't any "average reflow time" for these types of You have to watch the material to judge reflow time.Įvery board is different so time is not a good control (1 minute, 5 minutes, 20 When using a toaster oven, this visual method is the only ![]() Location to control the reflow length for the subsequent boards or to redo theĪ flashlight can help when watching the temperature indicator materialĬhange in form. The first board did not reflow properly, mark the PCB next to the location thatĭid not reflow with the temperature indicator (413 degrees F). Marking the board with the temperature stick. If you have more than one board, place the next PCB in the oven after Use your solder joint inspection criteria or the IPC 610 requirements. Surface and let it cool to near room temperature. When the temperature indication mark melts, remove the board from the oven.īe careful not to disturb the molten solder joints. If the temperature marker is used on the interior of the PCB, theĬorners and edges may get too hot and damage the board or the SMT NOTE: The edges and corners of the PCB will be hotter than the interior of Interior of the PCB next to a large component (PLCC or QFP) with the reflow ![]() If there is not a clear area on the edge of the PCB, mark the If the edge of the board has a breakaway do not mark the breakaway, mark theĮdge of the PCB. Make sure that you can see the temperature stick mark through the oven door. That will be nearest to the oven door, with the reflow temperature indicator Set the oven to bake and set the temperature to the highestīaking temperature setting (450 to 500 degrees F).īefore placing the PCB in the oven, mark it on the top side next to the edge Important: Before reflowing starts, turn the oven on to heat up, a minimum Of the toaster oven where you can readily see the change.ĥ. This particular one goes from light pink in color The board - a little like flakes of talcum powder. It melts at the specifiedĭifferent temperature indicators have different colors. Some of these are hard to mark with, so I often just shave off a tinyīit of flakes onto the board with a knife tip. There are several types but the one that I use looks like a big crayon. Long they can be exposed to the reflow or melt temperature without damage.Ī temperature indicator is designed to tell you this by the way it reacts Next, your SMDs are temperature sensitive, so you want to know how When you buy your paste, this information is provided by the solder Temperature and stay at that temperature (liquidous) for a given amount of Good solder joints solder paste has to reflow or melt at a certain There are two reasons to use a temperature indicator: First, to create Spatula to remove the solder paste from the PCB. If the print is not good, immediately use a Inspect the solder paste print to ensure all the lands have solder paste on The best angle for the type of solder paste you're using. *You may have to experiment a little to find The squeegee against the prototype stencil. The solder paste across the hole pattern. It 15 to 20 degrees from the vertical (toward the solder paste) and drag it and Squeegee and place it on the prototype stencil outside the solder paste. While holding the prototype stencil in contact with the PCB take the The prototype stencil and on to the PCB lands. The solder paste over the prototype stencil forcing the solder paste thought Squeegee: The squeegee is a flexible blade of stainless steel use to roll Spread the solder paste the full width of the hole pattern. Place the solder paste on the prototype stencil to one side of the hole ![]() Not delivered in a cold pack in a refrigerator. Paste provided in a jar, stir it for five minutes. Refrigeration and let it warm to room temperature. Remember: If using refrigerated solder paste, be sure to remove it from Apply the solder paste using your prototype stencil ![]()
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