Repair automatic perfume dispenser
When it runs the motor, measure the voltage between collector and emitter of Q2. You can assume it has this pinout. 

If that voltage is less than 1V and most of the voltage appears across the motor you can rule out the electronics (which I think is unlikely anyhow, typically an electronics failure would cause it to run continuously or not at all). 

Possible the DC motor commutator or brushes are worn or something else is wrong internally (or the gear chain, especially the early gears) is gummed up (use only a very light oil).