problem with tiny line on my printing rz 330

[charlzz_90]

hi all. I am having printing defect on my riso rz330. there is tiny straight line appears on the master drum. I replaced the scanning mirror and checked the TPH unit for damage but everything seems to be ok. anyone can help me trouble hoot this?
Tq in advance.

https://drive.google.com/file/d/0Bxc...p=docslist_api

https://drive.google.com/file/d/0Bxc...p=docslist_api

[allan]

If you reduce or enlarge the scanned image does the lines change position. If yes then image reader if no then TPH or something scratching the master.

[charlzz_90]

If you reduce or enlarge the scanned image does the lines change position. If yes then image reader if no then TPH or something scratching the master.

ok. I will try your recommendations. Will update the result later. Tq.

[charlzz_90]

ok. I will try your recommendations. Will update the result later. Tq.

after doing the zooming ,still the line at the same position
https://drive.google.com/file/d/0Bxc...p=docslist_api

any advise how to clean the TPH unit?

[20gaugeO/U]

Kind of hard to tell from the pics but it looks like you either need to clean all 3 mirrors and get the dust off one of them or your sep finger under the drum is scratching the master surface.
Make a master using service mode 80 (thru 85) and see if there is a line? Would cancel out the optics part of it