The way to test sensor and stepping motor

[rynxysh]

Hello here,I have a schematic diagram shows that a Component board connected with few photo sensor and a stepping motor.now my project is to test the component board to show the right output for the sensor and stepping motor,Is that any way to test them without those
sensor and motor?What i have to do?Thanks for reply,appreciated.XD

 

[chuckey]

1. no circuit!
2. Replace the sensors with potentiometers and the motor with low value resistors. Adjusting the potentiometers should simulate the sensors sensing ( what ever they do) and when the motor is actuated there will be a volt drop across the low value resistors, when I see a circuit perhaps I could suggest some component values.
Frank

 

[rynxysh]

What i got is only a block diagram.Do not have any circuit on that.Sorry for that I can't upload it because it is confidential to Sato.What i can tell it is a printer component board,and I hav to testing it's gap sensor,ribbon-end sensor,cover open sensor and stepping motor without assembly actual parts.thanks for ur reply.it is useful to me=p can i get more detail on potentiometers?what is a output i can check so that we know that sensor part is running normal?