Ricoh FT 4015 - Page 12

Symbol Name Function Index No.
S3
Tray Paper End
Sensor
Informs the CPU when the paper tray runs
out of paper.
28
S4
Registration Sensor Detects the leading edge of the copy paper
to determine the stop timing of the relay
roller clutch, and detects misfeeds.
30
S5
By-pass Feed Paper
End Sensor
Informs the CPU when there is no paper in
the by-pass tray.
29
S6 Exit Sensor Detects misfeeds. 23
S7
Scanner Home
Position Sensor
Informs the CPU when the 1st scanner is at
the home position.
40
S8
Lens Home Position
Sensor
Informs the CPU when the lens is at the
home position.
22
S9
Toner Density (TD)
Sensor
Detects the ratio of toner to carrier in the
developer.
26
Printed Circuit Boards
PCB1 Main Control Board Controls all copier functions. 1
PCB2
High Voltage Supply
Board - C/G/B/T/S
Provides high voltage to the charge corona,
grid, development bias, transfer corona, and
discharge plate.
2
PCB3
AC Drive/DC Power
Supply Board
Drives the exposure lamp, fusing lamp, and
main motor. Rectifies 30 Vac and 8 Vac input
and outputs 5 Vdc and 24 Vdc.
3
PCB4
Operation Panel
Board
Informs the CPU of the selected modes and
displays the situation on the panel.
6
Lamps
L1
Erase Lamp Discharges the drum outside of the image
area. (Provides leading/trailing edge and
side erases.)
4
L2
Quenching Lamp Neutralizes any charge remaining on the
drum surface after cleaning.
5
L3
Exposure Lamp Applies high intensity light to the original for
exposure.
20
L4 Fusing Lamp Provides heat to the hot roller. 25
Others
CO1
Total Counter Keeps track of the total number of copies
made.
34
H1
Tray Heater (Option) Turns on when the main switch is off to keep
paper in the paper tray dry.
32
H2
Optics
Anti-condensation
Heater (Option)
Turns on when the main switch is off to
prevent moisture from accumulating in the
optics.
39
TF1
Exposure Lamp
Thermofuse
Provide back-up overheat protection around
the exposure lamp.
21
ELECTRICAL COMPONENT DESCRIPTIONS 20 December 1996
1-10