6-5 CHECKING AND SETTING NEGATIVE PRESSURE
Negative Pressure System provides negative pressure to control the ink level inside printheads and keep ink
from flowing out through the nozzles, and positive pressure for purge ink or cleaning fluid for heads’
maintenance and avoiding nozzle jam. Improper negative pressure value will cause nozzle failure and the
printing quality will be bad. When negative pressure level is too high, it draws ink back and stops ink from
getting out of the printheads; nozzles will starves out and fail to print. When negative pressure level is too low,
ink will escape from printheads and accumulate around nozzles; ink drops fired by the printheads may be
absorbed by the accumulation and cannot arrive at the media, nozzles will fail to print. Thus, it is important to
check the negative pressure when the printer is just turned on.
6-5-1 CHECK THE NEGATIVE PRESSURE
After turning the printer on, please check the negative pressure value displayed on the negative pressure value
display or LCD panel (Menu>Ink Pressure Setup>Pressure Value). Before filling ink, we need to make sure the
negative pressure is acceptable. The negative pressure value normally is -2.2kPa.
When the printer is turned on, the value displayed may be beyond the range (-2.0KPA~-2.5KPA). But during
the initialization, the negative pressure system adjusts the negative pressure by itself until it gets to the value
set on the LCD panel. When the printer is ready after initializing, please read the value displayed on the LCD
panel.
6-5-2 SETTING THE NEGATIVE PRESSURE
When the negative pressure value displayed on LCD panel is not -2.2kPa, it needs to be set.
Method: Go to LCD panel and set the negative pressure value under Menu>Ink Pressure Setup>Pressure
Value with LCD panel buttons.
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