Ricoh J012 Service Manual page 383

cartridges [7] and send it to the head tanks.
One ink pump motor operates the pumps of two print cartridges. The ink pump motor drives
a single worm gear. The direction of rotation of the gear determines which pump is operated.
For example, when the KC ink pump motor in the illustration above rotates the worm gear
forward, the pump draws cyan ink (C) from the C print cartridge, and when the motor
reverses, it draws black ink (K) from the K print cartridge.
The ink pump motor switches on in response to a request for more ink when the ink level
sensor detects that the position of a feeler on the side of a tank indicates that a tank is low.
Ink is also drawn into the tank from the ink supply tubes when the air sensors detect too
much air in a tank and not enough ink. The air sensor activates the air release solenoid
which creates a partial vacuum inside the tank that purges the air from the tank through a
vent and at the same time draws more ink from the supply tubes into the tank.
SM
CÓPIA NÃO CONTROLADA
6-45
CÓPIA NÃO CONTROLADA
Ink Supply
J012/J013/J014