my usb printer isn't even responding to the echo command (echo "testing" >/dev/usb/lp0)

it was responding fine just a day ago. Since then I've installed LPRngTool,Ghostscript, and upgraded ifhp I'm not sure wether it was responding before I installed these. I installed them because I needed proper print filtering.

I don't get any error messages. The printer simply doesn't do anything.

Is there a log file somewhere I could look at?

my computer can obviously communicate with my printer through my usb port becuase this is the information I get in my devices file when I mount the usb device (mount -t usbdevfs usbdevfs /proc/bus/usb):

T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2
B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 0.00
S: Product=USB UHCI-alt Root Hub
S: SerialNumber=ff80
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms
T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=12 MxCh= 0
D: Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=04b8 ProdID=0005 Rev= 1.00
S: Manufacturer=EPSON
S: Product=USB Printer
S: SerialNumber=da-qt0002260518580
C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= 2mA
I: If#= 0 Alt= 0 #EPs= 2 Cls=07(print) Sub=01 Prot=02 Driver=usblp
E: Ad=01(O) Atr=02(Bulk) MxPS= 64 Ivl= 0ms
E: Ad=82(I) Atr=02(Bulk) MxPS= 64 Ivl= 0ms

this is what is displayed in /proc/bus/usb/drivers:

usbdevfs
hub
0- 15: usblp

Any ideas on how I could get this thing to even respond?