How to replace feed rollers and eject rollers in a scansnap S510?

Troubleshoot this issue step by step:

Check the Feed Selection Lever:
Ensure that the Feed Selection Lever (located on the lower left side of the front of the scanner) is in the correct position (up) for separation.
Straighten the edges of the stack of documents to be scanned.
Set the document guides so they are wider than the document to be scanned.
Place the documents face up into the feed tray, ensuring they touch the document stoppers.
Clear Any Jammed Paper:
Be careful when removing jammed paper to avoid cuts.
Remove any documents that have been left in the eject tray.
Close the document eject tray.
If the document ejection is stopped partway, perform this operation with the document eject tray extension open.
Hold the upper unit as shown in the diagram and open it to the point where you can remove the jammed document. The pickup roller is located in the middle of the upper unit. Do not hold the protrusion on the upper unit when opening it, as it may deform the pickup roller or cause a feeding error.
Close the feeder cover.

If the jam occurred in the feed section, pull the document out carefully without applying too much force. Be sure to remove any torn parts remaining in the scanner.
Close the upper unit slowly, ensuring it clicks into place. Do not force it to close, as this may damage the scanner.
After removing the jammed paper, check if the last page was scanned, and then continue scanning.

Rapid Recover System:
If a paper jam occurs when the "Rapid Recover System" is enabled in the ISIS/TWAIN driver settings, the image of the document is not saved, and scanning stops. You can continue scanning from the document that caused the paper jam after fixing the issue.

Additional Considerations:
Make sure the pickup rollers retract when the machine is powered on.
Check that the stopper plates are in the down position.
Verify that the upper unit is completely closed after clearing the jam.
Remember to handle the scanner components carefully to avoid damage. If the issue persists, consider seeking professional assistance or contacting Canon support for further guidance

here ya go this is how you change the roller an more
Fujitsu ScanSnap S500 S510 Replace Your Consumables

try to check and clean the paper pick rollers
also let me know if the printer is a inkjet or a laserjet printer

Hello Sharon,

When a document jam occurs, "J" and "1" will display alternately on the function number display panel of the scanner.Please perform the following:

1. Remove all documents from the ADF paper chute.
2. Open the ADF while pressing down the ADF open lever. If you are using fi-6130 with the imprinter option attached, please open the imprinter and then open the ADF.
3. Remove the jammed papers from the ADF.
4. Close the ADF pushing the center part of the ADF carefully.

If document jams occur frequently, please check the followings:

1. Do the documents satisfy paper specification?

2. Have the documents been jogged?

• Align the edge of documents for stable paper feeding.

• Remove documents with crease or dog-ear.

• Scanning different width of documents may cause skew and result in paper jam.

3. Are Chuter Unit (ADF paper chute),Guide P ASSY (Sheet guide), Feed roller cover (plate guide) and Brake roller cover installed correctly?

4. Clean the Feed rollers, Eject rollers,Plastic rollers, glass surface and paper feeding surface, and see if the error is

resolved.

5. Replace Pick roller or Brake roller, and see if the error is resolved.Check the consumable counter from the TWAIN driver screen or from the built-in Maintenance mode. When the counter exceeds the values, replace Pick roller or Brake roller.
6. If the issue still persists, then you are recommended to contact the nearest Fujitsu service center for further assistance.


Hope the above information is helpful.


Thanks & regards,
ScanCare

Did the light start blinking? Unplug the USB cable from the scanner, and replug.

this is not a thought I am 100% sure and give you the correct solution:
problem with the paper feeding section is dusty or due to developer drooping
1. Open the developer unit and check the rear side developer unit bush one or two bush are faulty
and drop the developer.
2. remove all paper trays with remove the four each screws
3. Remove the toner collection bottle
4. Remove the right side cover.
5. Remove paper left roller plate.(show in the picture)
6. Now remove the first tray paper feeding section(is a complete unit included paper feed rollers motor and clutch and gear section)
7. Clean the drooped developer from all gears and roller and motor section
8. remove the second and third tray paper feeding section and doing the same.
9. now fix it all
10. replace developer unit bush witch are faulty or if you don't have yet cut a plastic sheet and past the upper side of first paper feeding unit gears witch are don't disturb the paper path and stop the developer drooping on the gear

You need a new clutch spring.
http://www.thesupplynet.com/ScanSnap-S510-c4224.html
See chapter 6.
http://www.fujitsu.com/downloads/COMP/fcpa/scanners/s510m_get-started-guide.pdf

Possible cause:
The eject rollers get too slippery because of paper dust and other foreign matter.
Recommendation:
Clean the eject rollers with a paper towel dampened with water. A second cleaning may be
necessary. The easiest way to do this (without disassembling the machine for full access to
the rollers) is to hold the dampened paper towel against the rollers and make a blank print.
Clean the rollers as they turn and remove the paper towel as the paper ejects. Repeat as
necessary.
Now is a good time to also clean the paper pick up roller and feed rollers to prevent
feeding problems.

Visually check the clutch spring (located on the left side of the pickup roller shaft, just before the gear). If the spring is deformed or broken, replace the entire pickup roller shaft. The part you need to order are shown below. You will also need a small 'C' clip. I do not know if the clip comes ith the shaft or the gear...

PA03360-Y110
Pick shaft

PA03360-Y112
Pick Bearing ‘M’

PA03360-Y107
Clutch

PA03360-Y106
Clutch Spring

PA03360-Y105
Pick Gear


Regards,
Eric F.

Turn the printer off and open the access cover.
Look for any obstructions in the paper path and remove them if necessary. (It is possible to move the carrier assembly with the power off.)
Turn the printer on, load some paper, and press the Form Feed button. (On the X83, press the Select button.)
Watch the paper as it feeds through and try to determine where the jam is occurring.
Check to see if all the rollers are turning.

If all the rollers are turning, there may be something in the feed path that you can't see. Go to step 6.
If not, there is probably a feed motor or a gear problem and the printer may require service.

If the paper is jamming under the carrier assembly, you may be able to fix it using the manual feed slot.
Turn the printer off.
Take a #10 envelope and feed it through the left side of the manual feed slot until it comes right through the printer to the back of the exit rollers.
Move it up and down first, and then slowly move it over to the right side. If something is stuck under the black guide plate, this may work it loose.