Ricoh D124 Detailed Descriptions Manual page 117

The illustration above shows carriage unit cradles. The left cradle holds the black print
head units (K1, K2) and the right cradle holds the color print heads units (C, YM).
 The black thermistor (1) monitors the head around the black print head units, and
the color thermistor(2) measures the heat around the color print head units.
 A pair of air sensor terminals (3) is attached to the top of each sub tank.
 The purge valves (4) allow air to escape from the ink sub tank if an air sensor
detects too much air in the tank. The valve is operated by a plunger and air
release solenoid (not shown).
 The ink sub tanks (5) hold the ink pumped from the ink cartridges by the ink supply
unit.
 One ink sub tank feeler (6) is attached to the side of each ink sub tank. The OCFS
(On Carriage Fill Sensors) and the stationary main ink level sensors on the right
side of the machine check the positions of these feelers to determine the level of
ink in the sub tanks. The feeler arms are attached to the right sides of the K1, K2,
and C tanks, but the arm is attached to the left side of the Y tank.
 A filter unit (7) sets on top of every print head unit (8) as an extra precaution to
keep the ink free of dirt, paper dust, etc.
 Note that he YM print head on the right has two tanks on the same print head,, but
each tank has its own array of ink ports.
 The print heads (9) eject the ink onto the paper.l
Detailed Descriptions 111 D124