Ricoh D009 Service Manual page 807

Component Layout
No. Component
Upper Tray Full
S20
Sensor (B805 only)
S21 Punch Unit HP Sensor
Paper Position Side
S22
HP Sensor
S23 Punch HP Sensor
Punch Encoder
S24
Sensor
Clamp Roller HP
S25
Sensor
Fold Unit Entrance
S26
Sensor
Stack Junction Gate
S27
HP Sensor
SM
Function
B804: This sensor is not used on the booklet finisher.
There is only one upper tray full sensor (S18).
B805: 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.
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.
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).
Detects the home position of the punch unit and
controls the vertical movement of the punches when
they fire.
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.
Controls the movement of the clamp retraction roller
(the idle roller of the clamp roller pair).
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.
Controls the opening and closing of the stack junction
gate. Switches on when the stack junction gate is open
and at the home position.
35 B804/B805