ELECTRICAL COMPONENT DESCRIPTIONS
A265/A267 1-12 SM
Symbol Name Function
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).
S2 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.
S5 Original Length 2
Detects original length. This is one of the APS
(Auto Paper Select) sensors.
S6 Toner Density (TD)
Detects the amount of toner inside the
development unit.
S7 1st Paper End
Informs the CPU when the 1st paper tray runs out
of paper.
S8 2nd Paper End
Informs the CPU when the 2nd paper tray runs out
of paper.
S9 Image Density (ID)
Detects the density of various patterns and the
reflectivity of the drum for process control.
S10 Paper Overflow Detects paper overflow in the built-in copy tray.
S11 Paper Exit Detects misfeeds.
S12 Upper Relay Detects misfeeds.
S13 Lower Relay Detects misfeeds.
S14 Registration
Detects misfeeds and controls registration clutch
off-on timing.
S15 1st Paper Lift
Detects when the paper in the 1st paper tray is at
the feed height.
S16 2nd Paper Lift
Detects when the paper in the 2nd paper tray is at
the feed height.
S17 1st Paper Height – 1 Detects the amount of paper in the 1st paper tray.
S18 1st Paper Height – 2 Detects the amount of paper in the 1st paper tray.
S19 2nd Paper Height – 1 Detects the amount of paper in the 2nd paper tray.
S20 2nd Paper Height – 2 Detects the amount of paper in the 2nd paper tray.
PCBs
PCB1
BICU (Base Engine and
Image Control Unit)
Controls all base engine functions both directly
and through other control boards.
PCB2 PSU (Power Supply Unit)
Provides dc power to the system and ac power to
the fusing lamp and heaters.
PCB3 IOB (Input/Output Board)
Controls the fusing lamp and the mechanical parts
of the machine.
PCB4 SBU (Sensor Board Unit)
Contains the CCD, and outputs a video signal to
the BICU board.
PCB5 Lamp Stabilizer Stabilizes the power to the exposure lamp.
PCB6 LDD (Laser Diode Driver) Controls the laser diode.
PCB7 Operation Panel Controls the operation panel.
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