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ELECTRICAL COMPONENT DESCRIPTIONS
Switches
SYMBOL
NAME
SW1
Main Switch
Front Cover
SW2
Safety Switch
Paper Tray
SW3
Switch
Sensors
SYMBOL
NAME
Scanner Home
S1
Position Sensor
Lens Home
S2
Position Sensor
4th/5th Mirror
S3
Home Position
Sensor
Registration
S4
Sensor
S5
Exit Sensor
S6
Relay Sensor
Image Density
S7
(ID) Sensor
Auto Image
S8
Density Sensor
(ADS)
Printed Circuit Boards
SYMBOL
NAME
PCB1
Main Board
PCB2
AC Drive Board
DC Power
PCB3
Supply Board
Operation Panel
PCB4
Board
FUNCTION
Supplies power to the copier.
Cuts the ac power line, when the front cover is
open.
Detects when the paper tray is set.
FUNCTION
Informs the CPU when the 1st scanner is at the
home position.
Informs the CPU when the lens is at the home
position (full size position).
... A152 copier only
Informs the CPU when 4th/5th mirrors assembly is
at the home position (full size position).
... A152 copier only
1) Detects misfeeds.
2) Controls the relay roller clutch stop timing.
Detects misfeeds.
1) Detects when copy paper is set on the
by-pass feed table.
2) Detects misfeeds.
Detects the density of the image on the drum to
control the toner density.
Senses the background density of the original.
FUNCTION
Controls all copier functions both directly and
through the other PCBs.
Drives the main motor, exposure lamp, fusing
lamp, and quenching lamp.
Converts the wall outlet ac power input to +5 volts,
+24 volts, and a zero cross signal.
Informs the CPU of the selected modes and
displays the copier status and condition on the
panel.
1-10
24 June 1994
INDEX
NO.
14
13
1
INDEX
NO.
23
25
30
5
16
2
6
19
INDEX
NO.
33
27
36
8
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