Oki FAX 740 - Manual (Page 57)

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Ink Nozzle Test (Function 52)
This function prints a test pattern to check print quality.
1. Press [FUNCTION] [5] [2] .
NOZZLE TEST? Y/N
2. Press [YES] .
INK NOZZLE TEST
A test pattern will print, then your OKIFAX 740 will return
to standby.
If print quality is poor, clean or change the ink cartridge or
clean the ink carrier contacts.
Cleaning or Changing the Ink Cartridge (Function 53)
If you notice that print quality becomes poor, showing light
or dark bands across the width of the page, you may be
able to effect an immediate improvement by careful cleaning
of the ink cartridge. Follow the procedure below:
1. Press [FUNCTION] [5] [3] .
CHANGE INK? Y/N
2. Press [YES] .
COVER OPEN & CHG
3. Press the cover release tab and raise the top cover to its
fully open position.