We wouldn’t have the smoke clue for those.
All the drivers should come out and get tested.
dave
So I tested the driver on the LF and it measures 6.1 ohms.
The manual states otherwise. Which of course doesn't imply you would be wrong though.The protection circuits were not included in the Mark 3, which will explain the gaps in the board.
Their removal was apparently to do with the Mark 3 having a more robust tweeter than the Mark 2.
Mechanical damage could have been done, the voice coil former hitting the back pole piece being an often occurring issue. Or coil windings may have come loose from heat.So I tested the driver on the LF and it measures 6.1 ohms.
Anyway, the dark grey and blue wires next to the blue coil are the midrange leads, the red and grey next to the large yellow cap should connect to the tweeter. The other red and grey lead next to the red coil are the input leads. Solder them loose and connect the 1,5V battery intermittent, you should hear the clicking from the drive units.