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Very small stripes on fuji 7500 prints


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I'm after the service, we can't find the problem of horizontal parcels.
They are visible only on gray shades.
We replaced two modules responsible for feeding paper to the laser.
After replacing new modules, the problem is the same, does it mean buying a new motherboard?
I also replaced the bearings in the units, new bearings are in the rollers, replaced the belt, cleaned the rollers, the problem is the same.
The worst thing is that replacing two modules from a working machine gives the same effect.
I do not know where to look for the cause of the service too - betting on the motherboard or for sure?
Anyone had a similar problem?



WhatsApp Image 2023-04-26 at 06.54.32 (1).jpeg

WhatsApp Image 2023-04-26 at 06.54.32.jpg

WhatsApp Image 2023-05-05 at 11.22.58.jpeg

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1 hour ago, Minilab service said:

Yes, hidden. Two fans - connectors J/P1620 and J/P1621. Easily can access them. With a flat screwdrive remove two screws and remove fan plate . It is on foam rubber around. It is sticky, but it can be removed without any problems.

ok, I see that I don't have filters on the machine, I have to buy it, today I was fighting with the machine all day.
What filters do you recommend, can they be cut out of something or is it better to buy the original ones?

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Not only filters. You need clean, or change fans. First disconnect connectors J/P1620 and J/P1621 . Then try to print. If lines disapper then clean filters and fans. Connect connectors and look what will be after that. If lines will be again then disconnect fans one by one to see which one of them makes noise.

Fan is 109BM24HA2 . Datasheets :
109B - type name
M - frame size ( 97 mm )

24 - voltage
H - rotation speed ( 3300 RPM )
A - without sensor
2 - frame thikness ( 33 mm )
Can use the same model, or fan with similar parameters. Fan can be with sensor , or without it ( sensor is not used, so need connect only two wires ) . For example can be 109BM24GC2-1 ( the same fan, 3800 RPM, with sensor ) .

Filters can wash. If they are very dirty then need change them. Can find filter material and cut size, which you need.

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