Toshiba e-STUDIO 4500c, Service Manual

Page: 935 / 1120

ELECTRICAL COMPONENTS August 2006
B700-34
No. Component Function
the home position of the corner stapler. The corner stapler is
in its home position when the actuator on the corner stapler
unit interrupts this sensor.
S18 Stapler Rotation HP
Sensor Controls the angle of the position of the corner stapler during
oblique stapling.
S19 Upper Tray Full Sensor
(B700/B701) B700: When the actuator on the side of the upper fence
enters the gap of this sensor, the sensor signals that the
upper tray is at its lowest position (full) and stops the job.
B701: One of two upper tray full sensors. This is the higher
tray full sensor for A3 and other heavy paper. The other
upper tray full sensor (20) is for lighter paper.
S20 Upper Tray Full Sensor
(B701 only) B700: This sensor is not used on the booklet finisher. There
is only one upper tray full sensor (S18).
B701: One of two upper tray full sensors. This is the lower
tray full sensor for A4 and smaller paper. The other upper
tray full sensor (19) is for larger paper.
S21 Punch Unit HP Sensor Switches off the punch movement motor when the punch unit
returns to its home position. Pulse counts determine where
the punch unit pauses for punching and reversing.
S22 Paper Position Side HP
Sensor Controls the movement of the paper position detection unit.
Switches on when the horizontal detection unit is at the home
position (HP is the reference point).
S23 Punch HP Sensor Detects the home position of the punch unit and controls the
vertical movement of the punches when they fire.
S24 Punch Encoder Sensor When the punch mode is selected for the job (2-hole, 3-hole,
etc.), the machine controls the operation of the punch drive
(M24) motor which drives a small encoder shaped like a
notched wheel. This wheel is rotated forward and reverse
precisely to select which punches are moved up and down
during the punch stroke.
S25 Clamp Roller HP Sensor Controls the movement of the clamp retraction roller (the idle
roller of the clamp roller pair).
S26 Fold Unit Entrance
Sensor Detects 1) the leading edge of the stack during booklet
stapling, and 2) also used to signal an alarm if a paper is
detected at the entrance of the fold unit when the copier is
turned on.
S27
Stack Junction Gate HP
Sensor Controls the opening and closing of the stack junction gate.
Switches on when the stack junction gate is open and at the
home position.
S28 Fold Bottom Fence HP
Sensor Controls the movement of the bottom fence in the fold unit
using pulse counts based on the size of the paper selected
for the job to position the stack correctly for feeding.
S29 Fold Plate HP Sensor
Along with the fold plate cam HP sensor (S30) this sensor
controls the movement of the fold plate. The fold plate has
arrived at the home position when the edge of the plate
enters the gap of this sensor.
S30 Fold Plate Cam HP
Sensor Along with the fold plate HP sensor (S29), this sensor
controls the movement of the fold plate. The actuator
mounted on the end of the roller that drives the folder plate
forward and back makes three full rotations, i.e. the actuator
passes the sensor gap twice and stops on the 3rd rotation
and reverses. This accounts for the left and right movement
of fold plate.
S31
Fold Unit Exit Sensor 1) Detects the folded edge of the stack as it feeds out from
the nip of the fold rollers, stops the rollers, and reverses them
so the fold feeds back into the nip, 2) when the folded booklet