The error means that the interval of the ROS (C) signals exceeds the specified value. The normal problem is a bad mcu board. Measure the value between PJ401 on the MCU board and and ground for +5vdc. If you get +5 then replace the MCU board. Part number 960k31352. http://www.iteminconline.com/itemdesc.asp?ic=960K31355&eq=&Tp=
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