I wanted to post this in the vinyl board but this seems to have disappeared.
Anyway. In another thread, I wrote about the 2 B&O model 1900's I had resting on a rack for a few decades.
I got the first one to work in short order but the second one had some ailment where the motor overheated and running far too slow. Both have identical asynchronous motors, pulleys etc and the problem deck's motor coils had an impedance of more than 500 ohms compared to the working deck's 335 ohms.
Bottom line - the bastid is now working correctly. The motor starts instantly, the motor stays cool, the motor runs in the right direction and the platter speed is on the dot.
I unwound each coil completely and spooled the wire on two separate fishing line spools. There were no shorts and no sign of overheating.
So, yesterday I made a crude mechanical coilwinding contraption and re-wound each coil to the same spec as the working deck - 335 ohms.
I have just finished assembling everything and all is well.
The 'mystery' of course remains unsolved. How can less windings and less impedance in the motor coils produce more power, faster rotor rotation and no overheating? I kept the same resistor and capacitor as supplied by Communica, btw.
mafioso
Anyway. In another thread, I wrote about the 2 B&O model 1900's I had resting on a rack for a few decades.
I got the first one to work in short order but the second one had some ailment where the motor overheated and running far too slow. Both have identical asynchronous motors, pulleys etc and the problem deck's motor coils had an impedance of more than 500 ohms compared to the working deck's 335 ohms.
Bottom line - the bastid is now working correctly. The motor starts instantly, the motor stays cool, the motor runs in the right direction and the platter speed is on the dot.
I unwound each coil completely and spooled the wire on two separate fishing line spools. There were no shorts and no sign of overheating.
So, yesterday I made a crude mechanical coilwinding contraption and re-wound each coil to the same spec as the working deck - 335 ohms.
I have just finished assembling everything and all is well.
The 'mystery' of course remains unsolved. How can less windings and less impedance in the motor coils produce more power, faster rotor rotation and no overheating? I kept the same resistor and capacitor as supplied by Communica, btw.
mafioso
