Ricoh FT7770 Service Manual page 46

5. Sensors
Duplex Entrance (S-14) 46
Duplex Paper (S-13)
Duplex Paper Feed
(S-15)
Duplex Side Plate
(S-16)
Fusing (S-20)
Humidity (Option)
(S-26)
Image Density (S-22)
Lens H.P. (S-24)
Lens Safety (S-25)
Lower
Paper End (S-7) 81
Lower
Paper Feed (S-11) 43
Paper Size (S-12)* 75
Lower
Lower Paper Volume (S-8) 70
Lower
Tray Down (S-10)
Lower Tray Lift (S-9)
Oil End (S-21)
Paper Exit (S-19)
Pick-off (S-17)
Registration (S-18)
Scanner H.P. (S-23)
Upper Paper End (S-1)
Upper Paper Feed (S-5)
Upper Paper Size (S-6)*
Upper Paper Volume
(S-2)
Upper Tray Down (S-4)
Upper Tray Lift (S-3)
Pre-registration (S-26)
Sensor
* 220/240-volt machine only.
Jam detector.
48 Determines whether or not there is paper
in the duplex tray.
59
Turns off the duplex paper feed clutch;
also, serves as a jam detector.
41
Determines the home position of the duplex
side plate.
Jam detector.
92
33 Turns on the tray heaters if the humidity
gets too high. (Operates at 62%RH.)
28 Measures the density of the image on the
drum; the CPU adds toner as necessary.
16 Senses when the lens is at the home posi-
tion.
5 Senses when the operation of the Lens/Mir-
ror drive motor is abnormal.
Detects the presence of paper in the lower
paper tray.
Turns off the lower paper feed clutch;
also, serves as a jam detector.
Senses when 8½" paper is in the lower
paper tray.
Senses the amount of paper in the lower
paper tray.
74 Turns off the lower tray motor when the
tray reaches the down position.
42 Turns off the lower tray motor when the
tray reaches the
93 Senses when the
low.
91 Jam detector.
Jam detector.
31
Jam detector.
106
98 Informs the CPU
home position.
83 Detects paper in
44 Turns off the upper paper feed clutch;
also, serves as a jam detector.
80 Senses when 8½" paper is in the upper
paper tray.
69 Senses the amount of paper in the upper
paper tray.
82 Turns off the upper tray motor when the
tray reaches the down position.
35 Turns off the upper tray motor when the
tray reaches the up (feed) position.
Jam detector.
110
1-29
up (feed) position.
silicone oil level is too
when the scanner is at the
the upper paper tray.
30 April, '89