Ricoh FT 4215 Service Manual page 12

31 March 1994
Symbol Name
Sensors
S1 Scanner Home
Position Sensor
S2 Lens Home
Position Sensor
S3 4th/5th Mirror Home
Position Sensor
S4 Registration Sensor Detects misfeeds.
S5 Exit Sensor
S6 Paper End Sensor
S8 Color Toner End
Sensor
S9 Paper Lift Sensor
S10 Image Density (ID)
Sensor
S11 Auto Image Density
Sensor (ADS)
S17 Toner Overflow
Sensor
Printed Circuit Boards
PCB1 Main Board
PCB2 AC Drive Board
PCB3 Main DC Power
Supply Board
PCB4 Operation Panel
Board
PCB5 Option DC Power
Supply Board
Lamps
L1 Exposure Lamp
L2 Fusing Lamp
L3 Quenching Lamp
ELECTRICAL COMPONENT DESCRIPTIONS
Function
Informs the CPU when the 1st scanner is at
the home position.
Informs the CPU when the lens is at the
home position (full size position).
Informs the CPU when the 4th/5th mirror
assembly is at the home position (full size
position).
Detects misfeeds.
Informs CPU when the cassette runs out of
paper.
Detects when it is time to add toner for the
color development unit.
Detects the correct feed height of paper in
the cassette.
Detects the density of the image on the
drum to control the toner density.
Senses the background density of the
original.
Detects when the used toner tank is full.
Controls all copier functions both directly
and through the other PCBs.
Drives all ac motors, the exposure lamp,
fusing lamp, quenching lamp, and exhaust
blower motor.
Rectifies 28 Vac input and outputs dc
voltages.
Informs the CPU of the selected modes and
displays the situations on the panel.
Rectifies 26 and 10 Vac input and outputs
dc voltages. This board is required when the
document feeder is installed.
Applies high intensity light to the original for
exposure.
Provides heat to the hot roller.
Neutralizes any charge remaining on the
drum surface after cleaning.
11
Index No.
1
2
7
19
30
17
8
18
22
26
28
45
43
39
32
40
34
24
25