BOnjour !!

Bon j'ai du mieux...

# sane-find-scanner
found USB scanner (vendor=0x04b8 [EPSON], product=0x0820 [USB2.0 MFP(Hi-Speed)]) at libusb:001:003

Code :
# scanimage -L
No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).

mais quand je fais un :

code :
# scanimage -T -d epson
scanimage: scanning image of size 848x1169 pixels at 1 bits/pixel
scanimage: acquiring gray frame, 1 bits/sample
scanimage: reading one scanline, 106 bytes... PASS
scanimage: reading one byte... PASS
scanimage: stepped read, 2 bytes... PASS
scanimage: stepped read, 4 bytes... PASS
scanimage: stepped read, 8 bytes... PASS
scanimage: stepped read, 16 bytes... PASS
scanimage: stepped read, 32 bytes... PASS
scanimage: stepped read, 64 bytes... PASS
scanimage: stepped read, 128 bytes... PASS
scanimage: stepped read, 127 bytes... PASS
scanimage: stepped read, 63 bytes... PASS
scanimage: stepped read, 31 bytes... PASS
scanimage: stepped read, 15 bytes... PASS
scanimage: stepped read, 7 bytes... PASS
scanimage: stepped read, 3 bytes... PASS

Le scanner repond !!

mais je bloque de nouveaux pour aller plus loin...