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Did you install the drivers for the printer from the CD disc that came with it?
Then you may have to install drivers proper for the printer, to get the capability to adjust the ink down from 'blobs'.
This sounds like a familiar problem to me: some Epson printers need adjustments in the software or driver settings, to compensate.
Are you using Epson OEM-original ink cartridges, as opposed to 'Epson compatible' or refill, remanufactured, etc. cartridges?
Good. One last detail please, before I give you instructions on what to do about the problem:
What Windows version is on your computer, please?
Or if Apple, what MAC OS X 10.x version #, please?
OK, I am preparing instructions on the basis of that information.
1. turn Off the printer, and then unplug it from the power.
2. go to the Printers list, and select each instance there of your Epson XP620, then remove it with the - button.
3. restart the computer. (You can come back to this case after reinstalling, at
4. then go to
and download the Drivers and Utilities Combo Package, then once it is downloaded, install it, by double-clicking on the DMG file (if it doesn't automatically start the installer program.)
Then you may go to the Driver settings for the printer, and then you may look for the setting for 'Drying Time' or 'Ink Drying Time', and set it to a shorter or lower value. That should curtail the ink blob tendency.
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Find the setting for
and turn it down to a minimum, very short drying time.
See if that helps. If it does not at least reduce the photos to imperfectly printed but without excessive ink or runniness of ink, despite the settings change, then you probably have a severe defect in the inking system in the printer, which would obviously require either service-repairing of the printer, or its replacement.
How old is the printer? if it comes to the driver replacement and the Drying Time setting not helping.