Keypad - How it Works and Troubleshooting Guide

How it Works

The keypad works with the Serial Keyboard Interface (SKBIF) PCB to code the keys or buttons pressed by the user and convert them into a digital signal the Processor PCB can decode. Keypads for Mills are different from lathes as each machine family requires different function keys.

Symptom Possible Cause Corrective Action Section
A keypad button sticks or does not actuate when pressed. The flex cable from the keypad to SKBIF PCB is damaged. Inspect the cables and the connections. 1
The dome for a specific key fails to make a contact.

Section 1

Symptom: A keypad button sticks or does not actuate when pressed.

Possible Cause: The flex cable from the keypad to SKBIF PCB is damaged.

Corrective Action:

If any of the 24 wires fail to make connection, or if they have an intermittent connection, the keypad will malfunction.

  • Make sure the pins in the connector [1] on the SKBIF is in good condition.
  • Make sure the flex cable [2] is in good condition. A broken trace or open contact will cause a row or column to be inoperative.
  • Replace the keypad if the cable is damaged.

Be aware: Many service and repair procedures should be done only by authorized personnel. The service technicians at your Haas Factory Outlet (HFO) have the training, experience, and are certified to do these tasks safely and correctly. You should not do machine repair or service procedures unless you are qualified and knowledgeable about the processes.

Danger: Some service procedures can be dangerous or life-threatening. DO NOT attempt a procedure that you do not completely understand. Contact your Haas Factory Outlet (HFO) and schedule a service technician visit if you have any doubts about doing a procedure.

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