Epson Mt532 Manual

							1-4   Features and Specifications Rev. A




 
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Module Combinations and Specifications
The EU-T532/T542 can be used as four different types by the module combinations. The module 
combinations, functions and specifications are as follows:
(*): The printer pulls a cut sheet that has been forgotten in the printer and ejects it to the lower part of the cut 
      sheet presenter module. Environmental condition Operating temperature 0 to 50°C
Operating humidity 10 to 80% RH
ItemType 1
Type 2Type 3 Type 4
Functions Paper roll is held by 
a fixed shaft.Yes Yes¾¾
Cut paper is 
advanced by a cut 
sheet presenter.Yes Yes Yes Yes
Cut sheet is 
retracted if the user 
forgets to remove 
the paper.¾
Yes (*)¾
Yes (*)
Module 
combinationPaper roll supply 
moduleYes Yes¾¾
Printer module
Yes Yes Yes Yes
Control circuit 
board moduleYes Yes Yes Yes
Cut sheet presenter 
moduleYes Yes
(with a retracting 
function)Yes Yes
(with a retracting 
function)
Mass
Approximately 
5.5 kg
{12.13 lb}Approximately 
5.5 kg
{12.13 lb]Approximately 
2 kg
{4.41 lb}Approximately 
2 kg
{4.41 lb}
External dimensions 
(W ´ D ´ H): mm {inch}
176 ´ 
520.7 ´ 
231.4{6.93 ´
 20.5 ´ 
9.11}176 ´
 520.7 ´ 
231.4{6.93 ´ 
20.5 ´
 9.11}139.3 ´
 174.6 ´ 
165
{5.48 ´ 
6.85 ´
 6.5}139.3 ´
 174.6 ´ 
165
{5.75 ´ 
6.85 ´
 6.5}
Table 1.1   Specifications
ItemSpecification
80
50
10
 0
0 5 10 20 30 40 5550
+
50°
C 35%
40°
C 58%
34°
C 80%
Print quality is 
guaranteed.
Operation is 
guaranteed. 
						

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Chapter 2
Operation Principles
Outline of Mechanism
The EU-T532/T542 consists of four modules: the paper roll supply module, the printer module, 
the cut sheet presenter module, and the control circuit board module.
Paper Roll Supply Module
The paper roll supply module holds a large diameter paper roll and guides the paper to the 
printer module. This module consists of the paper holding part, the paper load-absorbing 
mechanism, and the paper nearend detector. The appearance of this module is shown below.
Figure 2-1  Paper roll supply module appearance
frame, main
paper nearend detector
screw, paper nearend detectorholder, paper roll
(Inside: shaft, paper roll)
holding plate, paper roll
paper roll hold unit
plate, fixed
frame, paper roll tension
(Inside: spring, paper roll tension)
shaft, paper roll tension roller
roller, paper roll tension 
						

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Paper Holding Section
The paper roll holding mechanism is a shaft support type. The paper roll holding section 
consists of the shaft, paper roll 
fixed to the frame, main assembly
, the holder, paper roll A
 
(for the inner diameter of the paper core: 25.4 mm {1 inch}) that fits the size of the paper roll core 
used, and paper roll hold unit
 that holds the sides of the paper roll. 
The paper roll hold unit
 is supported by the holding plate, paper roll
 so that it can open/
close. The plate, fixed
 slides into the groove of the shaft, paper roll
 and is automatically 
locked when the paper roll hold unit
 pushes against the shaft, paper roll
. To open the paper 
roll hold unit
, see the illustration (a sticker) on the plate, fixed
: slightly lift the bottom of the 
plate, fixed
 in the direction of the arrow (upwards) to release the lock, and then pull it toward 
the near side to open the unit. (For the illustration of the sticker, see page 3-6.)
Note:
If the paper inner core dimension differs from the holder, paper roll A
 due to the paper thickness, you 
can replace it with the holder, paper roll B
 (for the inner diameter of the paper core: 50.8 mm {2 inch}) 
or the holder, paper roll C
 (for the inner diameter of the paper core: 76.2 mm {3 inch}) packed in the 
box. (See page 6-37, “Assembly and Disassembly.” for replacement.)
Paper Load-absorbing Mechanism
The paper load-absorbing mechanism consists of four parts: the roller, paper roll tension
, the 
shaft, paper roll tension roller
, the frame, paper roll tension
, and the spring, paper roll 
tension
. The roller, paper roll tension
 receives the paper tension. The shaft, paper roll 
tension roller
 supports the roller, paper roll tension
 so that the roller, paper roll tension
 can 
rotate. The frame, paper roll tension
 fixes the previous two parts and is mounted on the shaft, 
paper roll
. The spring, paper roll tension
 is hooked on one end to the frame, main 
assembly
, and on the other end to the frame, paper roll tension
.
Using the paper tensile force generated when feeding the paper, this mechanism oscillates the 
roller, paper roll tension
 around the shaft, paper roll
, and reduces the paper feeding load due 
to inertia of the paper roll. 
Note:
 In order to use the function of this mechanism properly, paper must be fed along the paper route indicated 
in the illustration on the paper roll hold unit
. Feeding paper along the paper route other than the route 
in the illustration may cause improper operation or printing disorders.
Paper NE Detector
The paper NE detector
 has two kind of detections, the primary NE detection and the 
secondary NE detection. The primary NE detection can detect the amount remaining on the 
paper roll using a reflecting photo sensor. After the primary NE detection, the secondary 
detection can be used to return the status when the paper is fed to the length specified by the 
memory switch setting. (See SW No. 2, 3 in Table 2-8 [page 2-22])
The paper NE detector
 is mounted on the frame, paper roll tension
, and is secured with the 
screw, NE detector
. The position of the paper NE detector
 can be altered to adjust the setting 
for the amount remaining on the paper roll. (See “Paper NE detector setting method”on page 
3-9.)  
						

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Printer Module
The printer module has a printing mechanism with the paper feeding and a cutting mechanism 
to cut the paper. 
The printer consists of the following six mechanisms: the drive force transmission mechanism, 
the paper feed mechanism, the printing mechanism, the paper guide mechanism, the detector 
mechanism, and the autocutter mechanism.
Figure 2-2  Printer module appearance
Drive Force Transmission Mechanism
This mechanism consists of the motor, paper feed, receipt, B
 (fixed to pinion), the gear, 
reduction
, the gear, idler
, and the gear, platen
. The printer uses a stepping motor, the 
rotation force of which is reduced in sequence by the gear, reduction 
and the gear, idler 
before being transmitted to the gear, platen
. (The arrows in the figure below indicate the 
direction of the gear rotation.) The gear, platen 
is mounted to the frame platen unit and 
separates from the gear, idler
 when the platen
 is open.
Figure 2-3  Drive force transmission mechanism
printer module
holding plate, printer
gear, platen
gear, idler
gear, reductionmotor, paper feed, receipt, B 
						

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This printer uses a 4-phase bi-polar stepping motor driven by 24 V voltage controlled 2-2 phase 
excitation. The maximum drive frequency of 2-2 phase excitation is 1200 pps. [pps: pulses per 
second]
Paper Feed Mechanism
This mechanism consists of the paper feed mechanism and the platen-open mechanism.
Paper feed mechanism
The paper feed mechanism consists of the platen
 (paper feed roller) and the thermal head
. 
When the motor, paper feed, receipt, B
 rotates counterclockwise as viewed from the shaft, 
the gear train transmits the motion to the platen 
which rotates in direction A.
Figure 2-4  Paper feed mechanism
Paper feed operation during printing
The platen
 presses the thermal paper against the thermal head
 with a constant force. When 
the platen
 rotates in direction A, the thermal paper advances in direction B.
Figure 2-5  Paper feed operation during printing
thermal head
platen
motor, paper feed, receipt, B
A
B
platen
thermal paper 
A 
						

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Platen-open mechanism
The platen-open mechanism is used for the following purposes:
•  Paper loading when using the printer with the curved path type. (Excluding when 
using semi-autoloading mode.)
• Removing a paper jam when the paper jam has occurred
• The thermal head
 and the platen
 cleaning
The mechanism consists of the frame, platen
, the lever, platen
, the shaft, platen
, the spring, 
lever
, the lock lever
, the spring, lock lever
, and the pushplate, platen, B
.
In the frame, platen
, the platen
 is mounted. The lever, platen
 is operated by hand to open 
the frame platen unit. The shaft, platen
 connects the lever, platen
 and the frame, platen
 to 
the frame, base
 in a manner which allows them to rotate. The spring, lever
 pulls the lever, 
platen
 in the opposite direction of arrow A when the platen
 is open. The lock lever
 is located 
on the gear train side of the frame, platen
 and locks the frame platen unit to the frame, base
. 
The spring, lock lever
 (inside the lock lever
) pushes the lock lever
 back. The pushplate, 
platen, B
 is secured on top of the frame, platen
 and covers the fixed blade
.
When the frame platen unit is closed, the platen
 is in the print-ready position where the gear, 
platen
 and the gear, idler
 are engaged and the power can be transmitted readily. Also, the 
lock lever
 is locked at a part of the frame, base
 to prevent the gears from disengaging.
To open the platen
, turn the lever, platen
 in the direction of arrow A as shown in Figure 2-6. 
Simultaneously, the lock lever
 is released and the frame platen unit is opened. To close the 
platen
, turn the lever, platen
 in the opposite direction of arrow A until the lever stops. 
Figure 2-6  Platen-open mechanism
frame, platen
shaft, platen
frame, base
spring, lock lever
spring, lever
lever, platen
lock lever
gear, idler
gear, platen
A
< platen-open >< platen-close > push plate, platen, B
*The cover, gear is removed in these figures. 
						

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Printing Mechanism
This mechanism consists of the thermal head
 which has the head heating elements arranged in 
a series and has a driver IC for controlling voltage to the head heating elements, the platen
 
which is also used for the paper feed mechanism as well as this mechanism (the thermal head
 
is also used for both mechanisms), and the spring, press head
. The platen
 presses the thermal 
paper wrapped around the platen
 against the head heating elements pressed by the spring, 
press head
. When the elements are activated, the paper will be heated at the designated points, 
resulting in the printing action.
Printing operation principles
The cross-sections of the thermal head
 and the thermal paper are shown below. Printing is 
performed in the following steps:
Figure 2-7  Cross -section of thermal head and thermal paper
1. Drive pulses are sent to the designated dot electrodes in accordance with the print signal.
2. Since the resistor layers are formed at the top of each electrode inside of the thermal head
, 
the resistor layers are heated up when the drive pulses are sent to the electrodes.
3. The thermal energy of the heated resistors is transferred via the protective layer of the 
thermal head
 to the surface of the thermal paper, and the heat-sensitive layer of the paper 
changes color, thus forming the printed character.



base
heat- sensitive layer
resistor layer
protective layer
electrode layer
ceramic base plate
glaze layer
electrode layer
electrode layer
resistor layer 
						

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Data input and printing
The thermal head
 consists of the head heating elements, the head driver, which controls or 
drives the head heating elements, and the thermistor
, 
which detects the temperature of the 
thermal head
. The serial print data input from Data In (DI1) is synchronized to the CLOCK 
(CLK) input, and temporarily placed in the SHIFT REGISTER. Using the LATCH (/LAT) signal 
timing, these data are then stored in the LATCH REGISTER. Activated by the STROBE signals 
(/STR1, /STR2), the stored print data is used to control the gate ON condition for the head 
heating element drive pulse.
This printer is equipped with two strobes, and can print using a maximum of four divisions.
The drive pulse width is controlled by the control circuit board module.
Figure 2-8  Thermal head block diagram
Table 2-3   Strobe and Dot Number
STROBE No. Dot No. Dots/STROBE
1 1 to 320 320
2 321 to 640 320
*The STB terminals are pulled down in the control IC.
64 output each 
						

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Paper Guide Mechanism
This mechanism consists of the paper guide mechanism. The paper path consists of the paper 
guide, straight, front 
and the paper guide, straight, back
. The paper path is shown below.
Figure 2-9  Paper path
Detector Mechanism
This mechanism consists of the paper-end mechanism, the platen-open detector mechanism, the 
head temperature detector mechanism, and the black mark detector mechanism.
Paper-end detector mechanism
The paper-end detector mechanism is located inside the paper guide mechanism to detect the 
end of the thermal paper and the paper insertion state in the semi-autoloading mode. This 
mechanism consists of the transparent photo sensor
, the lever, paper detector
 which 
presses against the thermal paper and the spring, paper detector
 which pulls the lever, 
paper detector
.
Figure 2-10  Paper -end detector circuit
paper guide, straight, backpaper guide, straight, front
platen
paper

paper-end detector signal
Photo interrupter
Pin No.
220 W
75 K
W
13 V13
VDD
11
7, 8, 10
GND 
						

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The transparent photo
 sensor is in a high state (HI) when the paper is present, and in a low 
state (LOW) when the paper is not present because the lever, paper detector
 blocks light to 
the sensor. When the end of the thermal paper passes through the paper guide, the lever, 
paper detector
 operates as shown in Figure 2-11. At this time, the output level from the 
transparent photo sensor
 varies as shown in Figure 2-12, then the absence of paper is 
detected. When the semi-autoloading function is used, the insertion of paper changes the status 
from “no paper” to “paper.” Since the output level changes from LOW to HI, the status changes 
to “paper”; then the semi-autoloading function is initiated.
Figure 2-11  Paper-end detector mechanism 
Figure 2-12  Paper-end detector operation
platenthermal head
transparent photo 
sensor
lever, paper detectorpaper guide, straight, front
frame, basepaper

paper guide, straight, back
paper-end signal
conductive confirmation
paper-end detection