Figure 2-12 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 (C169 MAIN-B). 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/off within the
specified time. (Refer to the following timing chart.)
A
B
CN206
4
3
2
1
Main Motor M1
Main
Board
C169 MAIN-B
B
A
Figure 2-12. 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 2-13. Paper Take-Up Sensor and Paper Exit Sensor
On/Off Timing
EPL-5500 Service Manual Operating Principles
Rev. B 2-9
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