1244 Focuser as driver for a JMI Motofocus

On 2007 I adapted a 1240 focuser to drive the JMI motofocus of my C8 Scope

On May 2008 Meade put the 1244 focuser on sale, I thought it can be adapted to my WO scope and to the motor unit of my old 1240 or for another JMI focuser

This time I have documented the process

The focuse just afer opening the box (well, I already had removed the two small screws that holds the covers toghether

Top cover removed, you can see the gears and the small PCB

Motor removed, as you see it's a small dc motor, take note of the position of the wires on the motor

Removing the cable strain relief gromet

Removed the cable strain relief gromet

Here a close up of the board, checked and these are the main components:

U1 = 12C508 (PIC?)

U2 = LM78L05

Q1=NDS9956A

Q2=NDS9953A

Note the position of the wires in case the become loose or break

As I want to use the internal motor, placed a phone connector RS# 274-248, so it can switch between the internal or the external motor (note disconnect the power when plugging in or out the external motor)

Closeup of the cables after soldering on the phone plug, grey and green cables connect to the motor,

Gray connects were the black was, green connects were the red was.

Here a picture with all connections made

Terminated product

I listen to

18/05/2008