HP 1175C - Manual (Page 91)

12-4 Troubleshooting
Cleaning Cartridges
Use the Clean Cartridges feature when the Self Test Page shows
streaking or white lines through any of the colored bars. Do not clean
cartridges unnecessarily. This wastes ink and shortens the life of your
print cartridges.
To clean the cartridges:
1 Press the Menu button repeatedly until you see “Clean
Cartridges” on the front panel display.
2 Press Select/Resume .
The message “Printing a Cleaning Check Sheet” appears on the
front panel display, and a Print Cartridge Cleaning Page will be
printed.
NOTE If copy or print quality still seems poor after you clean the cartridges, replace
the one that is affected.