Large banding, about every 3 inches

[gamerxr72]

Im getting large bands in prints on one of our VJ1604's. We're having to reprint 20 yards of 3MIJ108Cv3, but it happens to every material to a lesser degree.

The printer makes a low thumping sound every few seconds or so. You can hear it in this file.

http://stashbox.org/v/781152/thumpingsound.wav

I suspect many things but can't be sure about any of them so I'm posting this here to see if anyone else had this happening.

 

[LenXIII]

Check out this thread. Sounds like the belt from your drive motor to the encoder wheel is skipping on the gear, probably just need to take the panel off and adjust it.

http://signs101.com/forums/showthread.php?t=59169&page=2

 

[gamerxr72]

Im going to go ahead and assume the encoder disc shouldn't have water stains on it.

 

[Compilla]

Could you possible post a picture of the encoder disk ?

 

[gamerxr72]

We replaced the encoder disc with a spare that we had. The problem is gone.

 

[OldPaint]

i dont have a printer.........but would like to say, REMEMBER PI.....3.14..........???????? CIRCLE 360 DEGREES........seems its movin the paper to far..
i belive it has something to do with the paper travel.........need to adjust the foward movement .....of the media...

 

[heyskull]

Definitley the PF encoder is touching the disc.

SC

 

[leerees]

Had exact same problem with my valuejet, replaced encoder disk and all is ok.

 

[gamerxr72]

To finish this thread up I'm going to post my original problem / cause of the problem, symptoms, and resolution.

My boss had to replace a print head, but during the stage of trying to recover the old print head, some solvent got on the PF encoder disc. This resulted in portions of the encoder strip on the disc being severely warped.

We noticed that when the roller was manually turned there was no sound, but when scrolling back and forth with the arrow buttons on the VJ1604 the thunk sound would happen.

I posted this thread and LenXIII offered a link to someone with a similar problem. After reading up on it, I checked and it was definitely the disc. We replaced it and the problem went away.

Everything is working correctly now.