televue skytour info

I have a Televue skytour and the AZ encoder is bad. Does anyone know where I can find out who makes the actual encoder, what the pin-out is or any other useful info. I asume that the 4 pins are Vcc, gnd, CH1 and CH2 and that it is a quadrature encded 2160 tic encoder. I'm trying to repair myself rather than buy a new set up.

Thanks in advnce,

J. Tucker