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Reflow oven profile6/3/2023 ![]() This led to a constant reading of 10,6 ☌. Its outer pins were connected to GND, to enable the “parasite power” 1-wire operation. Reading this topic first would have saved me a lot of time.įirst, I added a regular 4,7 kΩ resistor to the indicated pads and connected the centre pin of a DS18B20 to it. The temperature sensor DS18B20 comes in various flavours this makes finding the correct part and the installation not as easy as it seems. T-962 firmware upgrade Cold junction compensationįor more accuracy, it is necessary to measure the temperature at the connector block of the thermocouples. On the next start of the unit, I was greeted by the Unified Engineering logo. In Flash Magic, I selected the device LPC2134 (LPC2000) and was able to flash the custom firmware right away without any problems. Next, I connected n_RESET to GND and released it again. To enter the bootloader mode, I connected n_ISP to GND and turned the unit on. My adapter did not have these pins, so I connected it as follows: ISP header (left to right)Ĭaution: The heating elements and fan will run at 100 % when the controller is in bootloader mode! Some adapters have the required ISP and RESET pins to activate the bootloader mode automatically, some don’t. Custom firmwareįlashing the custom firmware to the LPC21xx controller is not too hard: Just connect an FT232RL USB to serial adapter to the ISP port of the controller board, enter bootloader mode and then flash the firmware with Flash Magic. Meanwhile, I was busy figuring out what to modify next and ordering the needed parts. I’ve baked the first couple of PCBs, including the DFOs for my CDI470 PAL/NTSC modification. With these most critical flaws taken care of, the oven was ready to use. Then, I added some more Kapton tape to the top and cable ties to reorganize the cables. Underneath is a board with some more tape. ![]() ![]() I removed all of the tape from the top and then lifted the glass wool mat. The next flaw is the white insulation tape that will produce an awful smell when heated. I scraped off some of the paint and also added a second ground wire to connect the top of the chassis (see system fan replacement). Make sure to protect yourself and clean up every time you open up the oven!īy default, the ground wire is screwed to the painted chassis and has no contact. Most of it covered, but there are always little pieces (f)lying around. Proper grounding and insulation tapeĬaution: The oven has a lot of glass wool for thermal insulation inside. But before I could use it for the first time, I had to take care of the most critical flaws. I bought the T-962 last November to have some support when soldering SMD components. I have included links to all of these modifications at the end of the article. Some people go even further and replace the system fan and controller board, add more powerful infrared heating elements or an additional fan for better heat distribution. Known modifications include: Proper grounding, replacing the insulation tape, custom firmware and additional temperature sensors. It has some serious and not so serious flaws that many blogs have already addressed. The Puhui T-962 is a cheap IR reflow oven that has been around for many years (the earliest occurrence that I’ve found is from 2007).
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