2901 intermittent lines

[Big Dave]

Hi all,

We are getting these inch long lines intermittently on prints - sometimes, just 1 line, up to 20 or 30 lines - NO error messages are displayed, and the daily setup looks beautiful.

After our first day with this problem, we performed the MLVA "fix" steps (internal calibrator gain adjustment, Load voltage Adjustment, Uniformity Pattern 2, 3, 4 delete UNF_FB.dat, copy UNF01.dat as UNF_FB.dat, Uniformity Pattern 1).  This mostly fixed it for a few days, but it's back again.  Same as before.

Very random, doesn't happen to every print, usually blue on lighter backgrounds, sometimes orange on dark areas.  Always happens on the same areas on the prints (towards the rear of the machine as you face the printer on your left and processor on your right), doesn't matter if it's the print coming down the center of the lane, or when 2 prints come out together, there is no discernable pattern, always on wallet or 4x6 size, has not yet appeared on 5x7 or larger size prints, variable length lines, max of 19mm in length.

Last time something similar happened, but was a problem with a cracked/damaged color filter wheel.  This time, I don't know the cause, but I haven't checked the color filter wheel.

What do you think it is ? 

(The sample pictures - the lines are there, but these have the minimum # of lines, the ones before had more.) 

 

[Minilab service]

red or brown dots ( or lines ) usually cause image correction pcb. If to zoom picture lines or dots on printed picture will be on different place. Check voltages on these boards, ventilation in image processing section ( many times saw stopped fans there - on QSS29 models ) . Can try to switch correction boards and make software upgrade from HD ( in service mode - for these boards ) . Clean dusts in this section.

[kodak_service]

Please, make the scan of one line with high quality (more than 600 dpi).

[Big Dave]

kodak_service, sent you a message.

minilab service - we will check fans and clean around the image processing board after we close today.

Edited June 26, 2017 by Big Dave

[Big Dave]

Just to let everyone know, the machine is doing much better after a very good cleaning of the Image Processing Board area. - all fans were working.

The day after cleaning, we had 3 prints with the lines all day, and no lines since then.

Thanks for everyone's help !

BTW, 18 year old machines are a little "finicky"....

 

[davidlam]

 , Agreed !