VJ1618 Nozzle Firing

[ITS Service]

Reaching out to other techs on this board. I have a customer with 8 Valuejets. 3 of these are the 1618s. Having an issue (see attached pic) where the nozzles will fire at random times, usually OUTSIDE of the print area. I have already changed out the 8 head cables (helped but did not eliminate), the cr board and data cables. I have left the electronics draw down (open) thinking overheating. Have left the black cover off over printheads, again thinking overheating. These printers are running 24 hours a day and are very tired after 5 years of this. The printheads are newer but had the same issue before changing printheads. All 3 of these have similar problems with nozzle firing.

The same rip is also outputting to VJ1638s without any problems. Any suggestions would be appreciated.

 

[chrisphilipps]

How does the bearing raceways and carriage bearings look? If there is too much vibration it can cause random head firing. Also check the T-Fence and make sure that it is not loose and that it is staying centered within the sensor. Finally inspect the CR Motor and make sure that it is not failing.

 

[ITS Service]

Thanks for your reply Chris. The bearings are a little rough. I've already cleaned & lubed. The other 2 1618s have similar issues, though not as frequent.