How to replace an Acroprint motor

How to replace an Acroprint 125 / 150 punch clock motor
Photos below.

  • 1) Unplug it, remove the case
  • 2) Tools needed: 
    Size 2 phillips screwdriver, Size 3 phillips screwdriver
    Thin flat blade screwdriver, a new time clock ribbon
    Two wire nuts, new Acroprint motor and cam




    Steps:   Click on this link for the steps!
    Article - The rest of the article - installing an Acroprint motor and cam (
  • Set the clock so that the time shows any hour, and the minutes on 12 - straight-up.
  • Cut the motor wires about an inch away from the motor
  • Remove and discard the ribbon
  • Remove the minute hand.  Note that there is a locknut underneath the hand, and a very small, specialized screw for the hand.
  • Using a flat blade screwdriver, get under the hour hand right at the center and wiggle it up and off.  It's on a sleeve.
  • Remove the 4 face screws and the face.  This exposes the frame.
  • Using the allen wrench, remove the cam and put the allen screw aside.
    --  Note:  You will be reusing the allen screw.
  • It's okay to force (twist and turn) the cam position, the motor is going away, anyway.
  • Remove the 4 large screws on the fork. 
  • Wack the back side of the motor frame assembly to release it.
  • That big gear controls the minute alignment.
    --  It is adjustable after you put it back together to center the minutes
         if you need to.
  • See the allen set screws, it's easy to figure out.
  • Remove the motor screws. Sometimes there is one long screw and one short.
     Note that the long screw goes at the bottom.
  • Replace the motor.  We put a drop of locktite (or nail polish) on the motor screws. Replace the cam.
  • When replacing the cam, make the cam flush with the end of the motor - closest to you, not the frame.
    Leave just the siightest space between the cam knob (minute impulse knob) and the motor frame.  It should not rub.

  • Put the motor and gear assembly back on.  Lower it in place with the black gear centering in the movement.
  • Put the face back on.  Do not overtighten.
  • Slide the h