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Chapter 6 Principles of Operation
6 – 46
5. Control
5.1 Control of Paper Size
"ON/OFF of Paper Size Switch of SWITCH ASSY SIZE" and "Diag Tool indication data" are shown in
the table below.
Paper Size Switches are indicated as SW1, SW2, and SW3 from the above one.
ON : The actuator is pushing the switch.
5.2 Selective Control on Paper Cassette
The preferred paper cassette selected after powering on can be changed via the printer settings. The
default is Tray 1 (TBD)..
The paper feeder by the paper tray under the printer is called "Tray 1", and the first
tray and the second tray in optional TRAY UNIT are called "Tray 2" , "Tray 3" and
"Tray 4" respectively.
5.3 PRINT HEAD Light Quantity Control
The image data are entered to the laser diodes in the PRINT HEAD as electric signals (data are
expressed with high and low voltage values), and the laser diodes convert the image data from electric
signals to optical signals (data are expressed with blinking laser beams).
Variations in light quantity of laser beams or variations in optical system (such as lenses) or drum
sensitivity cannot attain proper electrostatic image, and accordingly the laser diodes monitor the light
quantity of laser beams to control the light quantity so as to attain stable and proper electrostatic image.
The PRINT HEAD in this printer has four laser diodes for yellow, magenta, cyan, and black
respectively, and the light quantity is automatically adjusted for each color.
Paper Size
Paper Size Switch
Diag
indication data
SW1 SW2 SW3
LEGAL14" (SEF) ON ON ON 00
LEGAL13" (SEF) ON ON OFF 01
EXECUTIVE (SEF) ON OFF ON 02
B5 (SEF) ON OFF OFF 03
A4 (SEF) OFF ON ON 04
LETTER (SEF) OFF OFF ON 06
A5 OFF ON OFF 05
No cassette OFF OFF OFF 07