Linotronic 560 imagesetter

[koyilada2009]

When i switch ON the imagesetter - the green led is blinking. Even when i reset (press both stop buttons) it is not switching OFF. Only direct power OFF is working.

I tested the NT21Q and FSK board in another imagesetter, it is working fine.

Please help me solve this problem. Step by step procedure to be followed can be explained.