Electrical Component Descriptions - Ricoh A217 Service Manual

14 August 1997

1.3 ELECTRICAL COMPONENT DESCRIPTIONS

Refer to the electrical component layout and the point-to-point diagram on the
waterproof paper in the pocket for the locations of these components.
: New or modified components.
Symbol Index
No.
Printed Circuit Boards
PCB1 90
PCB2 89
PCB3 92
PCB4 93
PCB5 80
PCB6 85
PCB7 87
PCB8 95
PCB9 81
PCB10 84
PCB11 94
PCB12 86
PCB13 83
PCB14 31
PCB15 33
PCB16 40
PCB17 N/A
PCB18 51
PCB19 91
PCB20 7
Motors
M1 57
Description
SCU
AC Drive
DC Power Supply
BCU
Charge High
Voltage Supply
High Voltage
Control
Operation Panel
Scanner Drive
EX-IPU
SBU
Lamp Stabilizer
Main Scan
Synchronization
Detector - 1
Main Scan
Synchronization
Detector - 2
Transfer High
Voltage
Development
Bias Power Pack
Duplex Control
Liquid Crystal
Display
LCT Interface
Relay Board
Laser Diode Drive
Main
ELECTRICAL COMPONENT DESCRIPTIONS
Controls all copier functions both directly or
through other control boards.
Provides ac power to the exposure lamp and
fusing lamps.
Provides dc power.
Controls the mechanical parts of the printer.
Supplies high voltage to the charge corona
unit.
Controls the high voltage boards and the
quenching lamp.
Controls the touch panel display and LED
matrix, and monitors the key matrix.
Drives the scanner motor.
Processes the video signal from the SBU and
sends the video signal to the LD unit.
Contains the CCD, and outputs a video
signal to the EX-IPU board.
Provides dc power for the exposure lamp.
Detects the laser beam at the start of the
main scan.
Detects the laser beam at the end of the main
scan.
Supplies high voltage to the transfer belt.
Supplies high voltage to the development
roller.
Controls the operation of the duplex tray.
Controls the guidance display and displays
guidance for machine operation.
Interfaces the LCT control signal between the
main board and the LCT.
Switches ac power to either the dc drive
board (if the main switch is on) or to the
heaters (if the main switch is off).
Controls the laser diode.
Drives the main body components.
5
Note