Making the Power Cables and Floppy Cable

Making the Power Cables and Floppy Cable

Step 1: Making the power supply

Identify the pins starting on the left as 1, 2, and 3.

Pin 1 is the 12 volt line (yellow wire) and usually NC (no connection)

Pin 2 is ground and will connect to the black wire of the battery clip.

Pin 3 is the 5 volt and will connect to the red wire of the battery clip.

reg1.jpg (31850 bytes) batclip.jpg (33012 bytes)

Step 2: Solder the battery clip

Strip 1/4" insulation off the ends of the wires and solder battery clip to molex.

if you want to power off a power suppy, keep the large molex and cut back part of the mini-molex to allow you to solder the bater clip.

batadapt.jpg (42539 bytes)

Step 3: Making the Floppy cable and Testing

Floppy cable pinouts are described here.

Using a floppy cable with 34 pin female at each end, with a wire, connect pin 16 to ground (low) and pin 12 to ground (low)

With power source and floppy cable attached, the light should come on.

Holding down the write protect microswitch (either side of motor at front), the motor should run continously. If it turns on then stops, there is something wrong with the floppy cable. Check for twisted cables and proper ground.

Pin 18 changes direction of the read/write head. Set pin 18 to low (ground) then with another wire connect pin 20 to low using pulsing action (low/high), the stepper motor should move forward each time low is applied. If it does not it may already be at the end (although you should hear some clicking sounds), reverse and set pin 18 to high (take it out of the ground) and apply the pin 20 pulsing to low again. The stepper should move in the other direction.

pins.jpg (11867 bytes)

Step 1: Making the power supply Identify the pins starting on the left as 1, 2, and 3. Pin 1 is the 12 volt line (yellow wire) and usually NC (no connection) Pin 2 is ground and will connect to the black wire of the battery clip. Pin 3 is the 5 volt and will connect to the red wire of the battery clip.
Step 2: Solder the battery clip Strip 1/4" insulation off the ends of the wires and solder battery clip to molex. if you want to power off a power suppy, keep the large molex and cut back part of the mini-molex to allow you to solder the bater clip.
Step 3: Making the Floppy cable and Testing Floppy cable pinouts are described here. Using a floppy cable with 34 pin female at each end, with a wire, connect pin 16 to ground (low) and pin 12 to ground (low) With power source and floppy cable attached, the light should come on. Holding down the write protect microswitch (either side of motor at front), the motor should run continously. If it turns on then stops, there is something wrong with the floppy cable. Check for twisted cables and proper ground. Pin 18 changes direction of the read/write head. Set pin 18 to low (ground) then with another wire connect pin 20 to low using pulsing action (low/high), the stepper motor should move forward each time low is applied. If it does not it may already be at the end (although you should hear some clicking sounds), reverse and set pin 18 to high (take it out of the ground) and apply the pin 20 pulsing to low again. The stepper should move in the other direction.