Help - usb printing stopped working

[Chris Smith]

USP printing was working fine but now it has stopped.

"lsusb" shows the device:
Bus 004 Device 001: ID 0000:0000
Bus 003 Device 002: ID 046d:c00c Logitech, Inc. Optical Wheel Mouse
Bus 003 Device 001: ID 0000:0000
Bus 002 Device 004: ID 03f0:0a17 Hewlett-Packard
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 001: ID 0000:0000

"lsusb -v" partial:
Bus 002 Device 004: ID 03f0:0a17 Hewlett-Packard
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 Interface
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0        64
  idVendor           0x03f0 Hewlett-Packard
  idProduct          0x0a17
  bcdDevice            4.00
  iManufacturer           9 Hewlett-Packard
  iProduct               17 hp color LaserJet 3700
  iSerial                29 00XXXXXXXXXX
  bNumConfigurations      1

"ls -l /dev/usb/lp0" :
crw-rw----  1 root lp 180, 0 Sep 27 12:24 /dev/usb/lp0

Problem seems to lie here:

"lpinfo -v" partial :
serial serial:/dev/ttyS7?baud=115200
direct usb://Unknown
direct usb:/dev/usb/lp1
direct usb:/dev/usb/lp2
direct usb:/dev/usb/lp3
direct usb:/dev/usb/lp4

The usb backend no longer sees the device. Calls it "Unknown", used to call
it "HP/color%20LaserJet%203700". If I delete all pending jobs and then
manually edit printers.conf so that the line:
DeviceURI usb://Unknown
reads
DeviceURI usb://dev/usb/lp0
I can start the printer but the minute I send somethng to it it enters a
stopped.
If I change Device URI to:
DeviceURI usb://HP/color%20LaserJet%203700
it enters a stopped state and 
"lpstat -p" shows:
printer hp3700 disabled since Jan 01 00:00 -
        Unable to open USB device "usb://dev/usb/lp0": No such device

Debug log usually ends with:
D [27/Sep/2004:13:22:49 -0400] [Job 88] pw = 587.9, pl = 767.8
D [27/Sep/2004:13:22:49 -0400] [Job 88] PageLeft = 12.0, PageRight = 599.9
D [27/Sep/2004:13:22:49 -0400] [Job 88] PageTop = 779.9, PageBottom = 12.1
D [27/Sep/2004:13:22:49 -0400] [Job 88] PageWidth = 612.0, PageLength =
792.0
D [27/Sep/2004:13:22:49 -0400] [Job 88] 0 %%Trailer
D [27/Sep/2004:13:22:49 -0400] [Job 88] Saw Trailer!
D [27/Sep/2004:13:22:49 -0400] [Job 88] Saw EOF!
D [27/Sep/2004:13:22:50 -0400] UpdateJob: job 88, file 0 is complete.
D [27/Sep/2004:13:22:50 -0400] StopJob: id = 88, force = 0
I [27/Sep/2004:13:22:50 -0400] Saving printers.conf...
D [27/Sep/2004:13:22:50 -0400] StopJob: printer state is 5

Thanks for all assistance.

Chris