HP 600 - Manual (Page 56)

48 Care and maintenance
Print the self test
NOTE: If the print cartridges were used before being installed in the HP Fax,
the estimated ink levels may be inaccurate or unavailable.
NOTE: If the HP Fax is low on ink (ink level is 1/8), new faxes that come in will
not be printed. They will be stored in memory. You must manually print the faxes
from memory (see Reprinting faxes on page 44) until you replace the ink
cartridge (see Replace the print cartridge on page 48).
TIP: If memory become full before the print cartridge is replaced, the HP Fax
will stop answering the phone. Be sure to print the faxes out of memory regularly
if you do not immediately replace the ink cartridge.
Print the self test
When you want to test if the machine is working correctly, you can check it by
printing the self test.
1. Press Menu repeatedly until TOOLS appears and press OK.
2. Scroll to Self Test by pressing  and press OK.
The machine runs self test and prints a report which shows the current status
of the machine.
Replace the print cartridge
When you notice that the print becomes light or ink low or when install new
ink cartridge
appears in the display, replace the print cartridge. The part
number for replacement cartridges is HP 701.
1. Take out a cartridge from its packaging and carefully remove the tape
covering the printhead.
Hold the cartridge by the colored top or black areas only. Do not touch the
copper area.
2. Press the Access Cartridge button on the control panel.