All funtions work except the belt motor will not start.

1) You must check the fuse inside of Board.
2) The motor you will need make some test for determined if is faulty
3) The relais you must check if opening and closing ,clean or replace
4)If the drive belt is broken very important
5) The main motor controller faulty.
6)Transformer if is faulty
Now Watch this Videos +Tip with pacience + Carefully.
http://www.youtube.com/watch?v=qgb2TY3WCkg&feature=related
http://www.youtube.com/watch?v=-oeXTKqWECw&feature=related
http://www.youtube.com/watch?v=GPI6dFJCUA4
http://www.youtube.com/watch?v=bF3OyQ3HwfU&feature=related
http://www.fixya.com/support/r10724803-measure_voltage_in_transforme_fitness
http://www.fixya.com/support/r10786838-test_procedure_dc_motorhttp://www.youtube.com/watch?v=23ZgWaVEQjA

Attached is my design how the main controller board , had 90% function of the treadmills. Now you will have Very Powerful conclusion what is faulty in your treadmill, in according with this steps that I gave you before.

sincerely. Good luck.

E.CUADRA
MANAGUA, NICARAGUA. C.A.