Hitachi PB Series User Manual page 26

2. Hold wiping paper or similar against the ink ejection port at the end of the print
head. Press the [Start up] and [Eject ink] keys in sequence.
The ink jets out of the nozzle within the print head.
Properly position wiping paper or similar to prevent the ejected ink
from scattering.
Before starting a printing operation after 24 hours or more of printer inactivity
(e. g., starting daily operation after a holiday), complete the print head cleaning
Section 2.2,
procedure in the same manner as for a shutdown. (See
"Shutdown", and Section 1.1, "Usage Precautions").
2–2 2.1 Startup Section 2