Funky look to images

Question edited for clarity.

Lots of hidden screws

https://forum.luminous-landscape.com/index.php?topic=40409

https://www.google.com/search?q=epson+expression+1640xl+remove+glass+cover

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just use scan feture in high quilty mode when yuor doing 8x 11 instead of instant transfer alot these epsons have isses did u dl the latest driver from website for it also www.epson.com

In File Save Settings, you get a drop down box with the option to change the file format to PDF.

execute a calibration to correct the wrong color:

1. place your photo on the scanner, with a distance of 0.25 inch from the edge of the glass
2. open Epson scan and select Professionnal Mode
3. select the document source
4. select the image type
5. uncheck thumbnail then click Prevew
6. crop the area of the image
7. Click zoom to fine tune the area you see the streaks
8. select the resolution of 72 dpi
9. scan your photo

if the problem still not solved, you need to change the scanner unit , there are many dead pixels.

Please trash the twain driver completely.
- Trash epson scan and epson scanner monitor from applications.
- Go to hd. Go to library, then application support. Trash epson scanner module.
- Go back to library. Click on image capture. Trash twain data sources.
- Go to the hd. Click on users. Click on your computer name. Click on Library. Click on preferences. Click on the epson folder. Trash epson scan.
- Empty the trash and restart your mac.
Log on to epson.com. Install the epson11926.dmg.

Try using a separate scanner utility to do yr scans - not ideal but sorted my problem. I use the EPSOM scan utility with a Perfection 2400 scanner.

Turned off scanner. Rebooted computer. Turned on scanner again. Works fine now.

Most likely it is a spec of dust on the scanning sensor.  I recommend cleaning with a soft cloth and isopropyl alcohol.  More info here -  http://www.willshak.com/scanner/

try to fix the usb cable or just replace it and reinstall the drive software disk. bye.

Is this only when you print?