BUILDING THE STEPPER (II)

I started building the stepper. Last day I tried a 68705 unit that I had at hand to verify that the connection would work. I was too busy to buy a PIC and refresh my assembler knowledge, so I continue using the 68705 programmed in BASIC. Here is the unit,  understanding perfectly the pulses from the wallbox. It is connected trough an optocoupler. I will upload schematics of all later.

This is the stepper box. I just fixed the connectors, three as I planned. The box, from outside, it actually resembles a real stepper, somehow smaller. 

 The small connector in the front is the three-wire to the wallbox, the two Jones plugs on the right are the ones that connect to the selector (one of these connectors laying around in the floor of the cabinet). There we have contacts for all the letters (10), numbers (5) the even and odd tracks (2): a total of 17. The small connector in the left has to go to the Central Unit, to get power supply (32 DC and 25 AC), the other end of letters, numbers and tracks and last, the  switches under the keyboard that tell the Sinfonola that a selection has been made.

I had to install a new connector in the central unit. This is the only modification I had to make to the Sinfonola, and is not serious: I goes almost unnoticied, does not interfere with the normal function at all and if I remove the stepper in the future, it will not affect at all the machine. I used for this an existing hole, and I ran the cables to the floor of the jukebox.

If I don’t have any unexpected problem, all should be working during next weekend.