Ricoh J001 Service Manual page 524

Electrical Component Functions
No. Component
Print Heads
PH Print Head 1
PH Print Head 2
PH Print Head 3
PH Print Head 4
Sensors
1st Registration
SN
Sensor
2nd Registration
SN
Sensor
SN Air Sensors
Carriage Position
SN
Sensor
Ink Cartridge Set
SN
Switches
J007/J010/J011
CÓPIA NÃO CONTROLADA
J007/J010: Contains 2 ink tanks: K, C.
J011: Contains 2 ink tanks: Y, M
J007/J010: Contains 2 ink tanks: M, Y
J011: Contains 1 ink tank: K
J007/J010: None
J011: Contains 1 ink tank: C
J007/J010: None
J011: Contains 2 ink tanks: M, Y
Attached to the left side of the carriage. As the
carriage moves from side to side during printing.
The registration sensor performs two important
functions for print control: 1) It detects the leading
edge of every sheet, and 2) it detects the width of the
1st sheet of every print job when the carriage and
sensor pass horizontally over the vertical edge of the
1st sheet as it feeds.
Located in the center of the printer above the transport
belt and behind the horizontal motor timing belt. This
photosensor detects the leading and trailing edge of
each sheet when the printer is printing at high speed.
These readings are used to control job timing and to
detect paper jams.
A pair of vertical pins at the top of each ink tank. This
pair of pins detects changes in the voltage differential
on the surface of the ink inside the print head tank.
When these terminals detect air in the tank, this
actuates the air release solenoid and vents air from
the tank through the air release valve. This allows
more ink to enter the tank.
Mounted under the right, front corner of the top cover.
Detects the position of the carriage and print heads
above the paper. When the envelope selector is pulled
forward, the feeler leaves the gap and switches the
sensor off. This mechanism is used to detect the up
and down position of the carriage and print heads.
A microswitch for each ink cartridge connected in
series and mounted on the ink cartridge detection
plate at the back of the right front cover that holds the
ink cartridges. A metal contact on the back of the ink
cartridge makes contact with the microswitch when the
ink cartridge is inserted. This tells the machine
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Function
SM