Sharp MX-6070 cyan vertical lines

[Sharptech0892]

Have a mx6070 getting intermittent cyan vertical lines when printing and copying in color. See attached file, have tried drum,mk,dv unit, primary hv pwb, no luck so far.

[Phil B.]

Have a mx6070 getting intermittent cyan vertical lines when printing and copying in color. See attached file, have tried drum,mk,dv unit, primary hv pwb, no luck so far.

ITB cleaning unit

[Sharptech0892]

Replaced entire itb same result.

[Phil B.]

Replaced entire itb same result.

thanks for the after thought post

[driving lots of miles]

Your next step is to make sure all your contact points are clean, if this does not help you are looking at a board problem, try to reconnect all the cables to the board first.

[mojorolla]

Those lines are edge to edge so check the laser slit glass and shutter. Check the erase LED on the rear wall and the clear plastic insert that runs through the drum; could be a cleaning issue.
These faster models also tear up the drum / dv drive motor and scatter toner all over the charge boards on the rear wall. This can cause all kinds of colorful issues.

[Sharptech0892]

Lines go front to rear not lead to trail, image now looks like what you get with dirty main charge, see example

[Prints Charming]

You are losing Grid Bias.
Known issue on the MX6070, can be caused by problem color motor. It can interfere with HV.
Swap color motors to confirm if color lines change with the problem motor.

[Sharptech0892]

Replaced the main charge black box assembly that mc hv unit connects to the contact points, fixed issue.

[kentteam2]

Have a mx6070 getting intermittent cyan vertical lines when printing and copying in color. See attached file, have tried drum,mk,dv unit, primary hv pwb, no luck so far.

We had same issue recently and since we changed out the DC Power Supply Unit the issue has not returned