Specifications

SYMBOL NAME FUNCTION INDEX
NO.
S3 4th/5th Mirror
Home Position
Sensor
Informs the CPU when the 3rd scanner
(4th/5th mirrors assembly) is at the home
position (full size position).
37
S4 Registration
Sensor
Detects misfeeds. 21
S5 Exit Sensor Detects misfeeds. 35
S6 1st Paper End
Sensor
Informs CPU when the cassette runs out of
paper.
17
S7 2nd Paper End
Sensor
Informs CPU when the upper paper tray
runs out of paper.
61
S8 Toner End
Sensor
Detects when it is time to add toner. 6
S9 Toner Overflow
Sensor
Detects when the used toner tank is full. 34
S10 Paper Lift
Sensor
Detects the correct feed height of the
cassette.
19
S11
Image Density
(ID) Sensor
Detects the density of the image on the
drum to control the toner density.
27
S12 Development
Unit Set Sensor
Sensors whether or not the development
unit is properly set.
10
S13 3rd Paper End
Sensor
Informs CPU when the lower paper tray
runs out of paper.
62
S14 Relay Sensor Detects imsfeeds. 20
S15 Platen Cover Po-
sition Sensor
Detects when the platen cover is positioned
about 10 cm (4") above the exposure glass.
67
S16 Original Width
Sensor
Detects the original width. 44
S17 Original Length
Sensor
Detects the original length. 39
Printed Circuit Boards
PCB1 Main Board Controls all copier functions both directly
and through the other PCBs.
71
PCB2 AC Drive Board Drives all ac motors, the exposure lamp,
fusing lamp, quenching lamp, exhaust
blower motor.
65
PCB3 Main DC Power
Supply Board
Rectifies 26 and 10 Vac input and outputs
dc voltages.
48
PCB4 Auto Image
Density Sensor
(ADS)
Senses the background density of the
original.
33
1 December 1990
11-13