… continued from Part 1
The donor oven arrived and I began the modifications to make it turn on when it’s plugged into power bypassing all the safety and panel controls. This unit will be plugged into an outlet switched by the PID controller which will control the temperature and feature a safety override switch (to be covered in Part 3). The modifications to the oven were pretty easy. Here are the steps needed to turn the Black & Decker Infrawave oven into a Reflow Oven:
1) To get access to the board and relays that control the heating elements you first need to remove the following screws from the bottom of the oven.
2) Once the six screws are removed the bottom panel comes off easily. The board is mounted to the plastic bottom with screws. You can chose to remove the board or work with it mounted. I removed it and soldered 12 gauge stranded wire, you could use anything from 12 to 16 gauge (as the power cable on this unit is 16gauge, I wouldn’t run anything smaller). There are three bridge points you need to make. You can also ground the relay to keep it permanently on, I like the idea of bypassing any electronics completely as the solid state relay/PID will be doing all the controlling. Here is a photo of which points you want to bridge:
3) Once you solder everything, mount the board and bottom panel back to the oven. There is one last thing you need to do. There is a safety door switch which turns off the oven if the door is open. You will want to disable this. I drilled an 1/8″ hole and used a screw to hold it down.
4) Plug in the oven, the heating elements should turn on automatically. You have completed the oven mod.
In Part 3 we will be drilling the back of the oven and installing the thermocouple and wiring up all the electronics in our project box. Stay tuned…
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