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Lines on Prints on Frontier 350 Digital Prints


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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.

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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?

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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.

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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.

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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.

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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....

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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.

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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.... :)

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