Ricoh AFICIO A267 Service Manual page 29

ELECTRICAL COMPONENT DESCRIPTIONS
Symbol
Sensors
S1 Scanner HP
S2 Platen Cover
S2 Original Width
S4 Original Length 1
S5 Original Length 2
S6 Toner Density (TD)
S7 1st Paper End
S8 2nd Paper End
S9 Image Density (ID)
S10 Paper Overflow
S11 Paper Exit
S12 Upper Relay
S13 Lower Relay
S14 Registration
S15 1st Paper Lift
S16 2nd Paper Lift
S17 1st Paper Height – 1
S18 1st Paper Height – 2
S19 2nd Paper Height – 1
S20 2nd Paper Height – 2
PCBs
BICU (Base Engine and
PCB1
Image Control Unit)
PCB2 PSU (Power Supply Unit)
PCB3 IOB (Input/Output Board)
PCB4 SBU (Sensor Board Unit)
PCB5 Lamp Stabilizer
PCB6 LDD (Laser Diode Driver) Controls the laser diode.
PCB7 Operation Panel
Name
Informs the CPU when the 1st and 2nd scanners
are at home position.
Informs the CPU that the platen cover is in the up
or down position (related to the APS/ARE
functions).
Detects original width. This is one of the APS
(Auto Paper Select) sensors.
Detects original length. This is one of the APS
(Auto Paper Select) sensors.
Detects original length. This is one of the APS
(Auto Paper Select) sensors.
Detects the amount of toner inside the
development unit.
Informs the CPU when the 1st paper tray runs out
of paper.
Informs the CPU when the 2nd paper tray runs out
of paper.
Detects the density of various patterns and the
reflectivity of the drum for process control.
Detects paper overflow in the built-in copy tray.
Detects misfeeds.
Detects misfeeds.
Detects misfeeds.
Detects misfeeds and controls registration clutch
off-on timing.
Detects when the paper in the 1st paper tray is at
the feed height.
Detects when the paper in the 2nd paper tray is at
the feed height.
Detects the amount of paper in the 1st paper tray.
Detects the amount of paper in the 1st paper tray.
Detects the amount of paper in the 2nd paper tray.
Detects the amount of paper in the 2nd paper tray.
Controls all base engine functions 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 BICU board.
Stabilizes the power to the exposure lamp.
Controls the operation panel.
Function
1-12
20 September 1999