Epson DLQ-3000 Service Manual page 43

Ribbon Feed Gear (B)
Ribbon Feed Gear (A)
Figure 2-6. Core of Paper Feed Mechanism
Sensors are used to feedback information about paper movement (horizontal
mechanism which controls paper feeding. The sensors operate continually. The feedback timing for
a read signal is selected by the CPU depending on the movements of the paper feed and carriage
motors. Table 2-13 lists the functions of the PEW detector and paper loading sensor. Table 2-14
gives the specifications for both sensors.
Table 2-13. PEW Detector and Paper Loading Sensor Functions
Detector
Paper Width Measurement (detects
PEW Detector
the left and right paper edges.)
Paper Top Detection (detects the
top edge.)
Paper Bottom Detection (detects the
bottom edge.)
Paper End Detection
Paper Loading Paper Top Detection (along the
paper bail)
Sensor
Paper End Detection
\
Flag
Y ""—
Detection
Operating Principles
- - -
and vertical) to the
I
Function
Selects the left and right margins.
Selects the top margin.
Selects the paper length for the
forms override function and paper
length error detection.
paper jams.
Automatically supplies a cut sheet
from the front paper guide.
Supplies/ejects paper and detects
paper jams.
I
I
2-11