Ricoh B022, Service Manual, Page: 49 / 878

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ELECTRICAL COMPONENT DESCRIPTIONS
SM 1-11 B022/B027
1.5 ELECTRICAL COMPONENT DESCRIPTIONS
Refer to the electrical component layout on the reverse side of the point-to-point
diagram for the location of the components.
Symbol Name Function
Motors
M1 Scanner Drives the 1st and 2nd scanners.
M2 Polygonal Mirror Turns the polygonal mirror.
M3 Main Drives the main unit components.
M4 Exhaust Fan Removes heat from around the fusing unit.
M5 Upper Paper Lift Raises the bottom plate in the 1st paper tray.
M6 Lower Paper Lift Raises the bottom plate in the 2nd paper tray.
M7
Toner Supply Rotates the toner bottle to supply toner to the
development unit.
Magnetic Clutches
MC1 Upper Paper Feed Starts paper feed from the 1st paper tray.
MC2 Lower Paper Feed Starts paper feed from the 2nd paper tray.
MC3 Upper Relay Drives the upper relay rollers.
MC4 Lower Relay Drives the lower relay rollers.
MC4 Registration Drives the registration rollers.
Switches
SW1 Main
Provides power to the machine. If this is off, there is
no power supplied to the machine.
SW2 Right Upper Cover Detects when the right upper cover is open.
SW3 Right Cover
Cuts the +5VLD and +24V dc power line and detects
when the right cover is open.
SW4 Right Lower Cover Detects when the right lower cover is open.
SW5 Upper Paper Size
Determines what size of paper is in the upper paper
tray.
SW6 Lower Paper Size
Determines what size of paper is in the lower paper
tray.
SW7 New PCU Detect Detects when a new PCU is installed.
SW8 Front Cover Safety
Cuts the +5VLD and +24V dc power line and detects
when the front cover is open.
SW9 Operation
Provides power for machine operation. The machine
still has power if this switch is off.
Sensors
S1 Scanner HP
Informs the CPU when the 1st and 2nd scanners are
at home position.
S2 Platen Cover
Informs the CPU that the platen cover is in the up or
down position (related to the APS/ARE functions).
S3 Original Width
Detects original width. This is one of the APS (Auto
Paper Select) sensors.
S4 Original Length 1
Detects original length. This is one of the APS (Auto
Paper Select) sensors.