The mains RFI filter capacitor has exploded, caused by a period of disuse.
The component is completely non-essential to the unit's operation, and you can safely continue to use it in its present condition. The only thing is that the capacitor ejects a load of gunk over the circuit board when it goes, so it'll smell funny for a while.
I've had this happen to loads of stuff, including my IIe, one Mac Plus, several BBC computers, and even a portable VHSC tape deck's battery charger.
Replacement parts are incredibly cheap and very easy to replace. Replacing the power supply when one of these fails would be like buying a new car when the ashtray is full.
The component is completely non-essential to the unit's operation, and you can safely continue to use it in its present condition. The only thing is that the capacitor ejects a load of gunk over the circuit board when it goes, so it'll smell funny for a while.
I've had this happen to loads of stuff, including my IIe, one Mac Plus, several BBC computers, and even a portable VHSC tape deck's battery charger.
Replacement parts are incredibly cheap and very easy to replace. Replacing the power supply when one of these fails would be like buying a new car when the ashtray is full.