the current switch configuration is as follows. () around the current position
(0) 3 2 1
there is a sticker next to the JU-257 that says T773P. I ripped it off and underneath it says A023P. I wonder if this is a modified or upgraded model.(?)
I managed to find J-257A023P available for purchase at this site for a whopping $135.
I managed to find this (below) at
- switch for motor driving, two positions, labelled MO or MS
- switch for the ready signal, two positions, labelled RY or DC
- switch for drive select, four positions, labelled DS0, or DS1, or DS2, or DS3
For +3 use, the switches have to be set to MO and RY.
its somewhat helpful, but not detailed enough