Epson 860 Daily Use page 48

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Caution:
Once you install the ink cartridges, do not open their clamps
again until you replace the cartridges. Otherwise, the
cartridges may become unusable.
9. Make sure the B black and A color lights are off, then press
the B A cleaning button. The printer moves the print head
and begins charging the ink delivery system. This process
takes about thirty seconds to complete. When the ink charging
process is finished, the printer returns the print head to its
home position and the P power light stops flashing and stays
on.
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Caution:
The P power light continues to flash while the printer
performs the ink charging operation. Never turn off the
printer while this light is flashing. Doing so can result in
incomplete charging of ink.
10. Close the printer cover.
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