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Figure 2-11 shows the main motor drive circuit. The M1 main motor is a four-phase stepping motor,
controlled by the CPU (IC201) on the main board (C180 MAIN). This board has a stepping motor driver IC
that drives the M1 main motor with a constant current.
2.1.2.2 Paper Take-Up Sensor and Paper Exit Sensor
The paper take-up sensor has three functions:
1. To detect the top edge of paper. The engine starts printing when the detection signal
is received.
2. 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.
3. 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 or no paper. A
feed jam is a paper jam that occurs 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 (PC1) or the paper exit sensor (PC3) is on at power on or when the upper case
is closed.
The paper take-up sensor (PC1) or the paper exit sensor (PC3) is not turned on or off within the
specified time. (Refer to the following timing chart.)
A
B
CN206
4
3
2
1
M1 Main Motor
Board
C180 MAIN
B
A
Figure 2-11. Main Motor Drive Circuit
2.0 11.0
Take Up Solenoid ON
3.5-4.5
3.4-4.7
[seconds]
PC1
(CN203-3)
PC3
(CN208-3)
Figure 2-12. Paper Take-Up Sensor and Paper Exit Sensor
On/Off Timing
EPL-5500W Service Manual Operating Principles
Rev. A 2-9