Great insights, NickNougat!
Concerning the use of the heatgun without heatplate, your proposition makes sense.
I must now let you know about my first oven reflow attempt on a test device (FP3+).
I regret to report that it was a failure.
I purchased it as is some months ago, presumed victim of a sudden death. Tested plugging in. Tested with other modules. No reaction at all.
After thorough disassembly, here is the protocol:
12 min @ 200°C (command temperature, not measured)
05 min @ 230°C (command temperature, not measured)
I heard some noise coming out of the device, some sizzling/popping noise.
11 min cooldown in oven with door open.
10 min cooldown out of oven.
The device was lukewarm when I touched it. It was visibly discolored.
I observed something on the tray when I took it out of the oven (some component? I couldn’t find where it was supposed to be).
No reaction to being plugged in as a test with only the bottom module (which is functional, the writing on the module is just an identifier).
I tried it again this time with a bit longer spike. Nothing, again.
Maybe the ramp period was too long. I am not familiar with that model of oven, so I thought the light indicated pre-heating. I wanted to make sure the oven was indeed at 200°C before going ahead. But it just meant it was turned on.
I’m pretty disappointed with that result.