Replace Acroprint Motor and Cam Assembly

This procedure applies to older Acroprint mechanical punch clocks when the motor or cam assembly fails or causes minute alignment issues. Perform this repair only if the unit no longer advances time properly or prints inconsistently due to drive failure.

Disassembly

1. Cut motor wires approximately 1 inch from the motor.
2. Remove and discard ribbon.
3. Remove minute hand (note small screw and locknut underneath).
4. Carefully lift off hour hand from sleeve.
5. Remove four face screws and dial plate.
6. Using an Allen wrench, remove the cam. Save the Allen screw.
7. Remove four large fork/frame screws.
8. Tap rear of motor frame assembly to release it.
9. Remove motor mounting screws (note: long screw typically installs at bottom).

Motor and Cam Installation

1. Install replacement motor. Apply a small drop of thread locker to mounting screws.
2. Position cam flush with motor shaft end (closest to you).
3. Leave slight clearance between cam impulse knob and motor frame — no rubbing.
4. Ensure cam nub faces inward toward frame.
5. Reinstall motor/gear assembly, centering black gear into movement.
6. Tighten large frame screws securely.
7. Reconnect motor wires using wire nuts or insulated wrap.

Final Reassembly and Verification

1. Reinstall dial and hands.
2. Plug unit in and allow movement to advance.
3. Test multiple punches to verify correct minute alignment.
4. Adjust large black gear if fine centering is required.

Older mechanical clocks rely on proper cam spacing and gear centering. Correct installation restores minute impulse accuracy and protects payroll time integrity.