Photointerrupters - Ricoh FT7770 Service Manual

30
April '89
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3. Photointerrupters

Photointerrupters consist of a plastic encapsulated LED and phototransistor
separated by an open slot.
tivates the phototransistor and the sensor outputs a LOW signal. When an
actuator plate enters the slot, light from the LED is blocked and the output
becomes open.
The following sensors are photointerrupters
Sensor
Duplex Entrance
Duplex Paper
Duplex Side Plate
Fusing
Lens H. P.
Lens Safety
Lower Paper End
Lower Paper Feed
Lower Paper Size
Lower Paper Volume
Lower Tray Down
Lower Tray Lift
Paper Exit Sensor
Scanner H. P.
Upper Paper End
Upper Paper Feed
Upper Paper Size
Upper Paper Volume
Upper Tray Down
Upper Tray Lift
When the slot is empty, light from the LED ac-
Symbol Connector
S-14 CN203-A6 (Main Board)
S-13
CN203-A10(Main Board)
S-16 CN208-B14 (Main Board)
S-20 GN203-A2 (Main Board)
S-24 CN101-A16(Operation Panel)
S-25 CN101-B16 (Operation Panel)
S-7 CN203-B10 (Main Board)
S-11 CN202-A6 (Main Board)
S-12 CN204-B13 (Main Board)
S-8 CN208-A14(Main Board)
S-10 CN203-B12 (Main Board)
S-9
CN203-A14(Main Board)
CN203-A4 (Main Board)
S19
S-23 CN202-A8 (Main Board)
S-1 CN203-A9 (Main Board)
S-5 CN202-B5 (Main Board)
S-6 CN204-B12 (Main Board)
S-2 CN208-A18(Main Board)
S-4 CN203-All(Main Board)
S-3 CN203-A12(Main Board)
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