Answer: Please see followings:

Waste ink used for head cleaning gathers in the waste ink tank and the wiper bottle. If the warning message “!WS INKTANK CHK” or “WIPER BOTTLE” appears, check the waste ink tank and the wiper bottle.
You should periodically check the waste ink tank and the wiper bottle and dispose of the ink if they are full. The waste ink tank and the wiper bottle are placed in the waste ink box.

You should periodically check the waste ink tank and the wiper bottle and dispose of the ink if they are full. The waste ink tank and the wiper bottle are placed in the waste ink box.

[Disposal procedure]

•Waste ink tank
　Execute [MAINTENANCE] -> [STATION] -> [MENT: WASTE TANK] and dispose
　of the waste ink in the tank.

•Wiper bottle
　Execute [MAINTENANCE] -> [STATION] -> [MENT: WIPER BOTTLE] and
　dispose of the waste ink in the bottle.

For the detailed procedure, see
“OPERATION MANUAL” -> “Chapter 4 Maintenance” -> “When the waste ink is full”.