I pulled an SMA6501 off a board from an Epson dot-matrix printer.
On the board, pins 2, 4, 7, and 9 are going to the control pins of a atepper.
While, it looks like pin 11 goes to 2 pins on the stepper.
I thought this was a way of controlling higher current with lower current.
When I connect power to pin 5, power comes out all other pins except 10, 11, and 12.
When I put ground to pin 5, all the pins are floating except 1, 3, 6, and 8(they are grounded).
It is called a “Silicon NPN, PNP Epitaxial Planer”.
Printer service manual: http://www.feedroller.com/Store/Service%20Manual/Stylus%201000%20Service%20Manual.pdf
I have no clue how this drives a motor.
Please help me figure this out.