Ricoh R-C4 Service Manual page 336

OVERVIEW
Symbol
PCBs
PCB1 Controller
PCB2 PSU (Power Supply Unit)
SBCU (Scanner & Base
PCB3
Engine Control Unit)
PCB4 SBU (Sensor Board Unit)
PCB5 Lamp Stabilizer
PCB6 LDD (Laser Diode Driver) Controls the laser diode.
PCB7 Operation Panel
PCB8 High Voltage Supply
PCB9 Memory (Option)
IPU (Image Processing
PCB10
Unit)
Solenoids
SOL1 Fusing Drive Release
Lamps
L1 Exposure Lamp
L2 Main Fusing Lamp
L3 Secondary Fusing Lamp Heats both ends of the hot roller.
Quenching Lamp
L4
Heaters
Anti-condensation
H1
(Option)
H2 Tray (Option)
Others
TS1 Fusing Thermostats
TH1 Fusing Thermistors
Laser Synchronization
LSD 1
Detector
CO1 Mechanical Counter
CO2 Key Counter (Option)
Name
Controls all applications both directly and through
other control boards.
Provides dc power to the system and ac power to
the fusing lamp and heaters.
Controls the fusing lamp and the mechanical parts
of the machine.
Contains the CCD, and outputs a video signal to
the IPU board.
Stabilizes the power to the exposure lamp.
Controls the operation panel.
Supplies high voltage to the drum charge roller,
development roller, and transfer roller.
Expands the memory capacity for the copier,
printer, and scanner features.
Performs the image processing functions.
Releases the drive for the fusing unit.
Applies high intensity light to the original for
exposure.
Heats the center of the hot roller.
Neutralizes any charge remaining on the drum
surface after cleaning.
Turns on when the main power switch is off to
prevent moisture from forming on the optics.
Turns on when the main power switch is off to
prevent moisture from forming around the paper
trays.
Opens the fusing lamp circuit if the fusing unit
overheats.
Detects the temperature of the hot roller.
Detects the laser beam at the start of the main
scan.
Keeps track of the total number of prints made.
Used for control of authorized use. If this feature is
enabled for copying, copying will be impossible
until it is installed.
Function
6-6
21 July 2006