Nope. Motors aren't manufactured on PCB. Actually, it refers to an electromagnetic device that converts or transfers electrical energy according to the law of electromagnetic induction.
The difference between assembly and manufacturing:
Assembly is only a part of manufacturing;
Manufacturing refers to produce the stuff from scratch, more than assembly.
The difference between PCBA and CCA:
PCBA, printed circuit board assembly, which means the assembly of all circuit boards;
CCA, Circuit Card Assembly, which mreans the subassembly of small circuit boards.
Yes, the smoke detectors also need to have the LED light;
Generally, as long as the detector detects smoke and when the smoke reaches the alarm concentration, the detector red light will flash and give an alarm.
We can say that the motherboard belongs to PCB, but PCB is not the main board, such as: front panel, key board, power board, switch board, memory board, module board, etc.