polar 78x error 704?

hi everybody,
After working for about 20 minits with polar 78x i have this error (704) how can i fix it?

 

Hi,
704 means you're getting an knife overrun.it means your knife is somehow passing the position where it should stop at TDC. before moving to the electronics, please check whether the knife clutch-break assembly for correct function. If it slips, then that's the point.
It should be clean, dry and free from dirt, grease, oil and other slippery stuff. And as well as correct clutch gap should be checked too.
Hope this helps

 

hi,
than'ks for the reply ; can tou tell me where is the clutch-break ? excuseme my ignorance,i am new for using polar 78x

 

Hi,
If you don't know where the main clutch is, you're not familiar with the machine at all. I suppose the best thing to do is to call an experienced engineer/ technician to do the work. Because the clutch adjustment is not an easy task and involves lot of mechanical knowledge and experience.

Cheers