My printer samsung CLX6220FX, have "image error" how reset this error??

See page 103 of http://downloadcenter.samsung.com/content/UM/201112/20111205134621713/EN/English.pdf. It looks like the clx6220 uses a transfer belt to transfer all the different toner powders to the paper.
see
http://www.genuinetonercartridges.com.au/genuine-samsung-clp-620nd-clp-670nd-clx-6220fx-clx-6250fx-page-image-unit-transfer-belt.html
The transfer belt unit is refered to also as the image unit !
Also each toner cartridge contains the OPC drum and is replaced when you replace a toner cartridge by the look of it.
You need a transfer belt to transfer the image to the paper and this is why they call it an image unit.
I am guessing that the transfer belt needs replacement !

change print grey scale to 2 color.

hi, please clean high voltage power supply contact &refit

search trought service manual and see service menu for reset counter for pickup roller

Press the menu key followed by the # key and then 1934 and then press the menu key again and you should see the tech mode option available

Do you have a part number for the pick up rollers?

if the paper passes through the fuser with out issue then goes into error it is possible that the optic sensor has broken or has paperdust in it not detecting the EXIT of paper, have a look for a little flappy sensor/switch near the fuser on the exit side and see if it does indeed spring back to home position or if there is a bit of crud stuck there

hope this helps

lsu error

I hhave the same here. Just before the image error message, its says very shortly: "Checksum Volume is not valid". I think its a problem in the mainboard, so i'll bring the printer back to the store, it's still under warranty, so.