Microtek ScanMaker 5900 Motor Tread Replacement

Loosen the screws on the serial port by turning them counter clockwise by hand.

After loosening the screws, pull the serial port out.

Lift lid to its vertical position.

Pull lid straight up to remove it from the scanner.

Push the plastic opening tools into the crack between the top and the bottom of the chassis.

After placing one plastic opening tool into the slit, slide other plastic opening tools along the slit to detach the top from the bottom of the chassis.

Go all the way along the chassis until you can lift the upper lid.

Do this by grabbing the upper lid from the sides and rotating it ninety degrees so it is perpendicular to the bottom lid.

Grab the ribbon cable and gently pull it out of its slot with your fingers.

The upper lid can now safely be removed from the bottom lid.

Locate the stepper motor. With the front of the scanner facing you, the motor is located at the top left.

Disconnect the white connector from the vertical standing circuit board.

Using a #2 Philips Screwdriver, unscrew the two 7.7mm screws holding the stepper motor in place.

The stepper motor will become loose, but not completely free.

Using tweezers gently remove the tread from the black gear on the stepper motor.

The stepper motor will become completely free.

Facing the front of the scanner you will see a white plastic wheel holding the other end of the tread.

Pull the spring towards you until it snaps off the side wall releasing the tension in the spring.

Using a #2 Philips Screwdriver, unscrew the single 5.88mm screw holding the mount of the plastic wheel in place.

The plastic wheel and it's mount will be loose.

Remove the shaft holding the plastic wheel and the mount together

The tread will be completely loose.