Operating Principle
Service
2.1.2.1 Cassette Feed
This printer can use three types of paper cassette:
universal cassette, A4 universal cassette, and
optional envelope cassette. Figure 2-14 shows the paper cassette and feeder assembly.
Paper Cassette
Actuator
Paper Guide
Feed
Roller
\
pring
/
Turn Roller
Feed
Turn
Figure 2-14. Paper Cassette and Feeder Assembly
conditions are detected by the paper-out sensor, located on the FEEDER
While
paper is in the paper cassette, the
actuator
the
sensor is lifted. When the
paper supply runs out, the paper-out actuator is lowered, causing the shutter to interrupt light
from the LED to the photMransistor.
causes the signal to go
informing the engine
driver board (MCU
that the paper cassette is empty.
The paper cassette of this printer has paper guide plate and paper size detecting cam.
paper
guide of this cassette
move to fit several size papers. ‘This printer detects paper size by the
paper size switch. The paper size detecting cam is rotated by moving the paper guide plate (rear).
The paper size switch has four small mechanical switches. The rotating position of paper size
detecting cam is detected by these four switches on/off.
Cam
Paper Cassette
. . .
Feeder
Board
Paper
Switch
Size Spring
Figure 2-15. Paper Size Detecting
2-8
