Epson ActionLaser 1000, Руководство по обслуживанию

Страница: 64 / 157

Operating Principles
/Action Laser 1000/1500 Service Manual
2.1.2.2
Paper Take-Up Sensor and Paper Exit Sensor
The sensor has three functions:
To the top edge of paper. The engine starts when the detection signal
2)
3)
is received.
To detect paper size.
The printer detects the time it takes for paper to pass the paper
take-up sensor during paper feeding. If this time is long, longer paper
is feeding;
if the time is short, shorter paper is feeding.
To detect paper jams and feed jams.
If the paper take-up sensor does not turn on for paper feeding, the printer detects a feed jam.
A
feed jam is a paper jam that has occurred in the feed process.
If any of the following conditions is detected, the printer detects a paper jam. A paper jam is a jam
that occurs in the printing process area.
●
The paper take-up sensor or the paper exit sensor is on at power on or when
upper case is closed.
●
The paper take-up sensor or the paper exit sensor is not turned on/off within
specified time. (Refer to the following timing chart.)
Take Up
Solenoid ON
[sec.]
3.79
10.53
the
the
Figure 2-18. Paper Take U Sensor and Paper Exit Sensor
On/ Timing
2.1.2.3 Control
The is heated the heater lamp, which is powered by AC voltage. When the power
board receives a LAMP signal from the engine controller board the power supply
board supplies the AC voltage to the heater lamp. This AC voltage is cut by the interlock
switch when the case is open.
The temperature is detected by the thermistor. Based on the signals from the thermistor,
the engine controller board controls the fusing temperature (165° C, 329” F) using the
LAMP signal.
Engine Controller
Board
CN11A
THERMISTOR
CN8A
LAMP
Fusing Unit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
Power Supply
11
CN4E
HEAT-L
TF1
Heater
Lamp
HEAT-N
Figure 2-19. Control Circuit
2-1o