Ricoh A156 - Electrical Component Descriptions; PCBs and Motor Descriptions

5. ELECTRICAL COMPONENT DESCRIPTIONS
Refer to the electrical component layout and the point to point diagram on the
waterproof paper in the pocket for symbols and index numbers.
Symbol
Index
No.
Description Note
Printed Circuit Boards
PCB1 14
Main Control Controls all copier functions both directly or
through other control boards.
PCB2 12
AC Drive Provides ac power to the exposure lamp and
fusing lamps.
PCB3 11 DC Power Supply Provides dc power.
PCB4 96 Main Motor Control Controls the rotation of the main motor.
PCB5 1
CB High Voltage
Supply
Supplies high voltage to the drum charge
roller and development roller.
PCB6 55 T High Voltage Supply Supplies high voltage to the transfer belt.
PCB7 3
Operation Panel Controls the LED matrix, and monitors the
key matrix.
PCB8 8
Noise Filter (220 ~
240 V machines only)
Removes electrical noise.
PCB9 63
Duplex Control
(Duplex machines only)
Controls the operation of the duplex tray.
PCB10 6
Liquid Crystal Display
(A156 machines only)
Controls the guidance display and displays
guidance for machine operation.
PCB11 102
LCT Interface
(LCT machines only)
Interfaces the LCT control signal between
the main board and the LCT.
Motors
M1 88 Main Drives the main unit components.
M2 79
Toner Bottle Drive Rotates the toner bottle to supply toner to
the toner supply unit.
M3 97
Upper Tray Lift
(A153 machines only)
Raises the bottom plate in the upper paper
tray.
M4 86
Lower Tray Lift
(A153/A156
machines only)
Raises the bottom plate in the lower paper
tray.
M5 99
LCT Lift
(LCT machines only)
Lifts up and lowers the LCT bottom plate.
M6 94 Optics Cooling Fan 1 Removes heat from the optics unit.
M7 95
Optics Cooling Fan 2
(A153/A156
machines only)
Removes heat from the optics unit.
M8 89 Exhaust Fan 1 Removes the heat from around the fusing unit.
M9 90
Exhaust Fan 2
(A153/A156
machines only)
Removes the heat from around the fusing
unit.
M10 92 Scanner Drive Drives the 1st and 2nd scanners (dc stepper motor).
M11 78 3rd Scanner Drive Drives the 3rd scanner (dc stepper motor).
M12 87 Lens Vertical Drive Shifts the lens vertical position.
M13 77 Lens Horizontal Drive Shifts the lens horizontal position.
M14 58
Duplex Feed
(Duplex machines only)
Drives the feed roller and moves the bottom
plate up and down.
M15 61
End Fence Jogger
(Duplex machines only)
Drives the end fence jogger to square the
paper stack.
A156/A160/A162 1-12 STM