Guidance device for manipulation of machine

A device for guiding the manipulation of a machine, said machine having multiple keys to which various functions are assigned, comprising:

• first sensor means for sensing a condition in which the machine needs a maintenance operation;
• second sensor means for sensing a mounting condition of movable elements included in said machine;
• display means for displaying prompts which specify a procedure of the maintenance operation;
• storage means for storing displays of the prompts associated with the first sensor means;
• and
• control means for controlling said storage means and display means in response to outputs of the first and second sensor means;
• said control means being constructed to, when the first sensor means senses said condition of the machine, read displays of the prompts associated with said condition out of the storage means to display said prompts on the display means and, thereafter, sequentially read out displays of the prompts associated with the second sensor means to display said prompts on the display means in response to an output of the second sensor means and, upon completion of the steps indicated by said displayed data, provide prompts of additional steps in the process of operating said machine.