This is another installment of my 'A Fun Evening with...' series...;-). A Beogram 4000 that I restored this summer came back with a non-working arm lowering mechanism and the emission of a 'burnt smell'.
Oh well...I extracted it from the box and put it on the bench and removed the aluminum plates for a closer look.
After I plugged in and pressed ON, the unit started normally, but at the LP set-down point the arm would not lower. Instead the unit gave me a vivid demonstration of 'burnt smell', while a thin plume of smoke rapidly developed on the left side of the PCB that carries the carriage switches.
I quickly pulled the plug and lifted the PCB and found a browned solenoid resistor (7R1) and a blackened board: