Ricoh Aficio 401, Service Manual

Page: 10 / 52

Symbol Index
No.
Description Note
S9 12
LCT Upper Limit Signals the CPU to stop lifting the LCT
bottom plate.
S10 19
Registration Detects the leading edge of the copy paper
to determine the stop timing of the paper
feed clutch, and detects misfeeds.
S11 29
Image Density
(ID) Detects the density of various patterns on
the drum during process control.
S12 30
Toner Density
(TD) Detects the amount of toner inside the
development unit.
S13 1
Scanner HP Informs the CPU when the 1st and 2nd
scanners are at the home position.
S14 8
Original Length-1 Detects the length of the original. This is one
of the APS (Auto Paper Select) sensors.
S15 9
Original Length-2 Detects the length of the original. This is one
of the APS (Auto Paper Select) sensors.
S16 24 Fusing Exit Detects misfeeds.
S17 6
Platen Cover Informs the CPU whether the platen cover is
up or down (related to APS/ARE functions).
ARE: Auto Reduce and Enlarge
S18 32
Toner End Instructs the CPU to add toner to the toner
supply unit, and detects toner end conditions.
S19 28
Auto Response Returns the operation panel display and exits
from the energy saver mode.
S20 10
Transfer Belt
Position Informs the CPU of the current position of
the transfer belt unit.
S21 2
Original Width Detects the width of the original. This is one
of the APS (Auto Paper Select) sensors.
S22 34 Duplex Paper End Detects paper in the duplex tray.
S23 35
Duplex Turn Detects the trailing edge of the copy paper to
determine the jogging timing, and detects
misfeeds.
S24 42 Duplex Entrance Detects misfeeds.
S25 37
Side Fence Jogger
HP Detects the home position of the duplex side
fence jogger.
S26 41
End Fence Jogger
HP Detects the home position of the duplex end
fence jogger.
S27 23
Toner Overflow Detects when the used toner collection bottle
is full.
S28 14 By-pass Relay Detects misfeeds.
Switches
SW1 11
By-pass Feed Table Detects whether the by-pass feed table is
open or closed.
SW2 53
Tray Down Sends a signal to the CPU to lower the LCT
bottom plate.
SW3 20
Tray Paper Size Determines what size of paper is in the
paper tray.
SW4 54
LCT Cuts the dc power line and detects whether
the LCT is open or not.
A195
Copier
25 April 1997 ELECTRICAL COMPONENT DESCRIPTIONS
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