manager Posted March 17, 2011 Report Share Posted March 17, 2011 I get lines on prints in the direction of paper transport at all sizes and papers. On 10x15 cm prints lines are extremely discreet, invizibile almost, but on 20x30 cm paper these are more obious. These are lines not from transport or scratches, but something about printing, laser, settings, calibration, etc. Don't know what it is. Quote Link to comment Share on other sites More sharing options...
sisir Posted March 17, 2011 Report Share Posted March 17, 2011 Please check the crossover racks carefully. Quote Link to comment Share on other sites More sharing options...
manager Posted March 18, 2011 Author Report Share Posted March 18, 2011 Thanks, Sisir, but it isn't a scratch/cleaning problem, I attach an easy enlarged scan here. Quote Link to comment Share on other sites More sharing options...
bayro Posted March 18, 2011 Report Share Posted March 18, 2011 Hi, It seems that you have check Sub-scanner section.You have to clean belt flat and some support shafts. Regards Quote Link to comment Share on other sites More sharing options...
manager Posted March 18, 2011 Author Report Share Posted March 18, 2011 Sub-scanner? This lines appear from both film and digital prints. Sub-scanner is the area near laser printing? Quote Link to comment Share on other sites More sharing options...
Aaron_RIMG_TSR Posted March 18, 2011 Report Share Posted March 18, 2011 the subscan unit is what the laser screws onto. If you remove the laser you can clean the rollers underneath. Quote Link to comment Share on other sites More sharing options...
Kevbo37 Posted March 18, 2011 Report Share Posted March 18, 2011 The subscan unit is responsible for moving the paper smoothly as the laser exposes it. If the motion is not smooth it results in lines, just like your photo shows, at a right angle to the direction of the paper travel. You said "I get lines on prints in the direction of paper transport" Are you sure the lines are not perpendicular to the direction of paper transport? Quote Link to comment Share on other sites More sharing options...
manager Posted March 18, 2011 Author Report Share Posted March 18, 2011 No, the lines are paralel with the transport direction. Could it be AOM? Stripes are most obious at big sizes. Or could it be dust on laser mirrors, or even FE software image conversion? I will restore Ghost image of Image processing computer and keep you informed. Quote Link to comment Share on other sites More sharing options...
Aaron_RIMG_TSR Posted March 18, 2011 Report Share Posted March 18, 2011 manager... check your private messages Quote Link to comment Share on other sites More sharing options...
Kevbo37 Posted March 18, 2011 Report Share Posted March 18, 2011 I have never seen an AOM driver fail in such a way that it would make perfectly straight lines on the paper. That being said, it is conceivable if the AOM driver had some very steady oscillation at the perfect frequency it could cause such artifacts. But extremely unlikely. Did it start suddenly? The lines are so evenly spaced that it could be the crossover racks as Sisir suggested. I still suspect it is dust in the subscanning section. Quote Link to comment Share on other sites More sharing options...
yustas Posted March 19, 2011 Report Share Posted March 19, 2011 If exclude scratches because of clogged chemistry racks - I dare to suppose that it can be : 1. AOM (crystal) is being getting dead 2. Optical section is not in workng condition. But this is just suggestion - I can be wrong... Quote Link to comment Share on other sites More sharing options...
manager Posted March 20, 2011 Author Report Share Posted March 20, 2011 Is this AOM principle just like Cathod TV's? I mean does the laser beam direction gets altered by AOM cristal? Or by optical system? Is the laser beam direction handeld by energy field or by mechanical mirrors? So, you think it can be optical system, you mean dust on it? Could it be power fluctuation? I had a power stabilizer until two months ago. But this streaks are from a few days, or from a few days I noticed them. Quote Link to comment Share on other sites More sharing options...
sisir Posted March 23, 2011 Report Share Posted March 23, 2011 I think it is from subscanning motors. Otherwise it is from Laser Unit. Quote Link to comment Share on other sites More sharing options...
yustas Posted March 23, 2011 Report Share Posted March 23, 2011 If it would be a motor malfunction - he would have had lines across (perpendiculary) to the direction of paper movement. We can see lines along the movement. Optical section consists of many parts: mirrors, prism and AOM (crystal) AOM is driven by AOM driver. So here we should search the cause. Sorry for ugly English.... Quote Link to comment Share on other sites More sharing options...
Kevbo37 Posted March 24, 2011 Report Share Posted March 24, 2011 The AOM crystal is not a electric field nor a mechanical mirror. The AOM (Acousto-Optic Modulator) crystal deflects the beam by means of an acoustic (sound)wave at 200Mhz inside the crystal. The resulting higher and lower density regions create a variable mirror to the laser light if introduced at the correct angle. The amplitude of the wave determines the intensity of the reflection and the frequency determines the angle of the reflection. Quote Link to comment Share on other sites More sharing options...
manager Posted March 24, 2011 Author Report Share Posted March 24, 2011 Wikipedia My problem is still unsolved, I am lucky that it is noticeable only on big sizes. I will keep you informed if I manage to do something. Quote Link to comment Share on other sites More sharing options...
manager Posted March 29, 2011 Author Report Share Posted March 29, 2011 I can see thoselines in smallprints now also. Here is a 9x13cm.You can see the lines appear twice in the picture. Just can't solve this problem. Remember, lines are paralel to transport direction, not perpendicular. Quote Link to comment Share on other sites More sharing options...
yustas Posted March 30, 2011 Report Share Posted March 30, 2011 The AOM crystal is not a electric field nor a mechanical mirror. The AOM (Acousto-Optic Modulator) crystal deflects the beam by means of an acoustic (sound)wave at 200Mhz inside the crystal. The resulting higher and lower density regions create a variable mirror to the laser light if introduced at the correct angle. The amplitude of the wave determines the intensity of the reflection and the frequency determines the angle of the reflection. wow... never heard such exact explanation.... Quote Link to comment Share on other sites More sharing options...
yustas Posted March 30, 2011 Report Share Posted March 30, 2011 by the way... try to check "ground" sometimes it affects the quality of prints and line as a result ofits absence... Quote Link to comment Share on other sites More sharing options...
manager Posted March 30, 2011 Author Report Share Posted March 30, 2011 PROBLEM SOLVED BY CLEANING OPTICS FROM DUST. THANKS, FRIENDS! Quote Link to comment Share on other sites More sharing options...
itt Posted April 28, 2011 Report Share Posted April 28, 2011 How do you manage to clean the optics ? I have a simillar problem, but I don't know how to do'it. Thanks in advance ! Quote Link to comment Share on other sites More sharing options...
sisir Posted May 1, 2011 Report Share Posted May 1, 2011 The problem was from Subscanning Motor or Belt. Quote Link to comment Share on other sites More sharing options...
Pruthvi Posted January 28, 2012 Report Share Posted January 28, 2012 Clean the Polygon Mirror in the Laser section and there may be a chance problem occured to imappropriate grounding.... Quote Link to comment Share on other sites More sharing options...
rontierfotolab Posted April 21, 2012 Report Share Posted April 21, 2012 CHECK SUBSCANNING UNIT STEEL BELT AND ROLLERS Quote Link to comment Share on other sites More sharing options...
rontierfotolab Posted April 21, 2012 Report Share Posted April 21, 2012 SUBSCANNING UNIT BELT OR ROLLER PROBLEM Quote Link to comment Share on other sites More sharing options...
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