(HELP) epson dx7 head keep spraying ink while not printing

[uvprinting jakarta]

Hi, i have a large scale uv flatbed printer from china, using epson dx7 head
Everything seem to be going well until the last couple of weeks, the dx7 head seemed to be spraying white ink all over the place while not printing, and while moving the head (the other head for cmyk is working fine)
I just changed the dx7 head so the head must not be the one having trouble
My guess would be the grating sensor / limit sensor, or the cables / mainboard
Every input would be appreciated, thanks a lot !

 

[Sean@CedarHouse]

What does spraying mean? Is it dripping or printing? If it's dripping then its most likely a leak someplace. If it's printing the ink, as in ink going through the head like it would printing, then it's most likely an electrical issue.

 

[uvprinting jakarta]

What does spraying mean? Is it dripping or printing? If it's dripping then its most likely a leak someplace. If it's printing the ink, as in ink going through the head like it would printing, then it's most likely an electrical issue.

It's printing the ink while i move the head / not leaking, i wonder which part has the problem here? Because i swapped the heads and each one of them had the same issue on white , cmyk on the other hand , no problem

 

[uvprinting jakarta]

 

[uvprinting jakarta]

Now the problem changes into this: it prints normally about the first 30% of the image , then afterwards it starts spraying white ink all over again (the picture i uploaded above), wonder what caused this?

 

[Sean@CedarHouse]

Yeah. Something is triggering the white head to do something.

Crossed wire?
Head Board misbehaving? (I don't know if that's what they call it. But the board the ribbon cables come out of to the head)

You know, it could be a software issue too. Maybe an update? Might check the firmware just to be sure too.

It is interesting that there's no pattern to the white though, just firing. I've seen this with other printers where the head just starts printing swaths of ink. It's usually a cable or board issue.