The dots are so delicate, with tiny magnet wires and soft plastic that can melt, that it has to be done very carefully. Even with the very best desoldering equipment it would take forever.
Put a hot air gun on the back of the board, and they'll either just drop out or do so with a small poke of the pins.
I have recently resurrected one from an old bus — https://www.bobek.cz/buse/
The dots are so delicate, with tiny magnet wires and soft plastic that can melt, that it has to be done very carefully. Even with the very best desoldering equipment it would take forever.
Put a hot air gun on the back of the board, and they'll either just drop out or do so with a small poke of the pins.