Khan,
If you go to the home page and read the first paragraph "ELEVATOR TROUBLESHOOTING". It will answer your question!
I understand that you are mechanically inclined. And yes this forum is meant to help the industry professional. It is my intent to protect the safety of the individuals that ride elevators.
I've piloted the helicopter I have pictured. Would you trust me to fly your family in a 747?
If you are insulted, I apologize.
