Epson Mt532 Manual

							2-10   Operation Principles Rev. A
Confidential
Platen-open detector mechanism
The platen-open detector mechanism has a microswitch
 which detects whether the platen
 is 
open (printing impossible because the thermal
 head
 is away from the platen
) or closed 
(printing possible). The microswitch
 can be OFF only when the frame, platen
 is perfectly 
closed, and at all other times is ON.
Figure 2-13  Platen-open detector circuit
Head temperature detector mechanism
The thermal head
 has a thermistor
 to detect the temperature of the thermal head
.
Black mark detector mechanism
The black mark mechanism is a device which can be attached inside the paper guide mechanism 
to determine the printing position when using pre-printed thermal paper. This mechanism uses 
the reflective photo sensor.
Figure 2-14  Black mark detector circuit
Pin No.
platen open
platen open
The pin No.s 14 and 15 can be reversed.
14
15
SW2
SW1
Pin No.
black mark detector
output

220 W
0 to 100 KW
10 K
W
13
VDD
12
7, 8, 10
GND 
						

							Rev. A Operation Principles   2-11 EU-T532/T542 Technical Manual
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Black marks are detected through changes in output level from the reflective photo sensor. The 
changes in reflectivity between the pre-printed black marks and blank areas of the thermal 
paper cause the amount of light returning to the sensor to vary; then the sensor output level is 
also varied as shown in Figure 2-15. These variations are used to detect the black mark. Since the 
relationship between the black mark and the print position can be specified in the printer set up, 
detecting the black mark permits the correct positioning of the paper.
Figure 2-15  Black mark detecting operation
Autocutter Mechanism
This mechanism consists of the fixed blade mechanism, the movable cutter blade mechanism 
and the emergency cutter mechanism.
The basic principle of the autocutter mechanism is an application of the scissors principle, where 
the paper is cut by two crossing blades. A configuration which allows the two blades to separate 
has been adopted so that the fixed blade, H
 separates from the movable cutter blade, full, H
 
when the platen
 is open.
Fixed blade mechanism
This mechanism is mounted on the frame platen unit. This configuration consists of the fixed 
blade, H
 which cuts the paper directly, the spring, fixed blade
 which stabilizes the vertical 
positioning of the fixed blade, H
, and the cover, fixed blade
 which covers the fixed blade, 
H
 and is a paper guide as well as makes the operation to open the platen
 safe.
Figure 2-16  Fixed blade mechanism
black mark detector signal
conductive confirmation
black mark detection
spring, fixed blade
fixed blade, H
cover, fixed blade
frame, platen unit 
						

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Movable cutter blade mechanism
This mechanism is mounted on the frame, base
. The drive force transmission mechanism is on 
the cover, cutter, H
 side. The motor, cutter, H
, which is a DC brush motor attached the gear, 
cutter motor
. It supplies the power and is attached on the cover, cutter, H
 with screws. The 
gear, cutter worm, H 
is supported by the shaft, reduction A/C
 , and the gear, cutter drive, 
H
 is attached with push nuts to the shaft, cutter drive gear
 fixed on the cover, cutter, H
. 
After being transmitted through the gear, cutter worm, H
, the power is transmitted to the 
gear, cutter drive, H
.
The rotational movement of the gear, cutter drive, H
 is translated to the back and forth 
movement of the movable cutter blade, full, H
 by being engaged the shaft, movable cutter 
blade drive
 with the oval hole of the movable cutter blade, full, H
 on the frame, cutter
. 
Also, the microswitch
 attached to the cover, cutter, H
 is connected to the gear, cutter drive, 
H
, enabling it to detect the position of the movable cutter blade, full, H
. The lead wires of the 
motor, cutter, H
 and the microswitch
 are bound together and connect to the circuit board
.
The shaft, movable cutter blade
 is on the frame, cutter
 side. The receiver, movable 
cutter blade
, the spacer, movable cutter blade
, the spring, movable cutter blade
 and 
the washer, movable cutter blade spring
 are mounted on the shaft, movable cutter blade
 
in a group with a push nut. 
When putting the cover, cutter, H
 and the frame, cutter
 together, engage the shaft, movable 
cutter blade drive
 with the oval hole of the movable cutter blade, full, H
, and secure the 
cover, cutter, H
 and the frame, cutter
 with screws.
Figure 2-17  Movable cutter blade mechanism
gear, cutter drive, H
shaft, cutter drive gear
cover, cutter, H
shaft, movable cutter 
blade drive
gear, cutter worm, H
shaft, reduction A/C
(inside the gear, cutter 
worm: dot lined part)
frame, cutter
movable cutter blade, full, H
receiver, movable 
cutter blade
spring, movable 
cutter blade
washer, movable 
cutter blade spring
shaft, movable cutter blade
spacer, movable cutter blade
motor, cutter, Hmicroswitch
gear, cutter motor 
						

							Rev. A Operation Principles   2-13 EU-T532/T542 Technical Manual
Confidential
Auto cutting operation
The autocutter
 will operate when the frame platen unit is closed and a paper is loaded. (The 
frame platen unit can be closed when the movable cutter blade, full, H
 is in the standby 
position. The auto cutting operation is performed in the following steps:
1. Drive the motor, cutter, H
 in the forward rotation.
2. The microswitch
 is switched from OFF (open) to ON (closed), while the motor, cutter, H
 
continues to rotate in the forward rotation. The movable cutter blade, full, H
 intersects 
with the fixed cutter blade, H
 and cuts the paper from the right to the left, to the direction 
of the first column.
3. After cutting the paper, the movable cutter blade, full, H
 starts to return to the home 
position.
4. As the movable cutter blade, full, H
 approaches the home position, the microswitch
 is 
switched from ON (close) to OFF (open); then the motor, cutter, H
 stops rotating and the 
brake is applied.
Figure 2-18  Auto cutting operation
Figure 2-19  Auto cutting control example
fixed blade, Hspring, fixed blade
movable cutter blade, full, H
cutter motor forward driving
cutter motor brake
switch signal rectifying 
waveform 
						

							2-14   Operation Principles Rev. A
Confidential
Note:
If the movable cutter blade, full, H
 can not be returned to the home position because of a foreign 
matter locking the blade when powered by the motor
, rotate the knob on the gear, cutter worm, H
 
with a tool such as a ball-point pen or tweezers to move the movable cutter blade, full, H
 to the home 
position. The window on the cover, cutter, H
 can be used to check if the movable cutter blade, 
full, H
 has returned to the home position.
Figure 2-20  Home position check
window

knob 
						

							Rev. A Operation Principles   2-15 EU-T532/T542 Technical Manual
Confidential
Cut Sheet Presenter Module
The cut sheet presenter module has a mechanism to carry the paper printed and cut by the 
printer module to the paper exit. Also, it has an optional cut sheet retracting function to retract a 
cut sheet when the cut sheet is not removed. 
Figure 2-21  Appearance of cut sheet presenter module
Paper Carrying Operation (With Loop)
A paper carrying operation is performed at the same time with the start of the paper feeding of 
the printer module. The motor, paper feed receipt, B
 rotates in the clockwise direction as 
seen from the shaft direction, and the roller, cut sheet presenter
 rotates in the clockwise 
direction via the gears. The roller, cut sheet hold
 is pressed to the roller, cut sheet presenter
 
by a spring. The first roller, cut sheet presenter
 and the roller, cut sheet hold
, and the 
second roller, cut sheet presenter
 and the roller, cut sheet hold
 are connected with the belt, 
cut paper presenter transmission
 (not shown) and rotate in the same direction.
The paper sent from the printer module is fed along the paper guiding part, and carried between 
the first roller, cut sheet presenter
 and the roller, cut sheet hold
. When the tip of the paper 
reaches the detection position, the motor, paper feed receipt, B
 stops temporarily. 
Figure 2-22  Start of the cut sheet carrying
carried paper sensor
roller, cut sheet hold (first)
cut sheet
roller, cut sheet presenter (second)
motor, paper feed, 
receipt, B
roller, cut sheet hold (second)
roller, cut sheet presenter (first) 
						

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 The tip of the paper sent from the printer module is in the standby state between the 
first roller, 
cut sheet presenter
 and the roller, cut sheet hold
, and the paper is continuously fed from the 
printer module. The paper pushes up the paper guide, upper 
and temporarily forms a loop. 
Figure 2-23  Cut Sheet with Loop
When the paper feed from the printer module is finished, the motor, paper feed receipt, B
 
resumes rotating. At this time, the cutter on the printer module cuts the paper. The cut sheet is 
passed from the first roller, cut sheet presenter
 to the second roller, cut sheet presenter
, 
and is carried to the paper exit
. 
When the carried paper sensor 
detects the end of the cut sheet, the motor, paper feed 
receipt, B
 will stop. With the cut sheet between the second roller, cut sheet presenter
 and the 
second roller, cut sheet hold
, a series of operations is completed and the cut sheet is ejected 
from the paper exit
. 
A cut sheet presence sensor
 is provided near the paper exit 
to detect whether or not the cut 
paper is removed by a recipient. 
 
Figure 2-24  End of the Cut Sheet Carrying Operation
roller, cut sheet presenter (first)
roller, cut sheet hold (first)
paper guide, uppercut sheet
autocutter
autocuttercarried paper sensor
roller, cut sheet hold (second)
cut sheet presence sensor
paper exit
roller, cut sheet presenter (second)
cut sheet
roller, cut sheet hold (first)
roller, cut sheet presenter (first) 
						

							Rev. A Operation Principles   2-17 EU-T532/T542 Technical Manual
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Paper Carrying Operation (Without Loop)
The cut sheet can be carried without forming a loop.
Figure 2-25  Cut Sheet Operation without Loop
Note:
During paper carrying operations without a loop, do not pull out the paper.
Retract Function
 The retract function retracts the cut sheet inside the unit if the recipient does not take the cut 
sheet. The retract mechanism consists of the frame, paper route change
, the plate, route 
change guide
, the roller, retract
, the solenoid
, and the paper path change sensor
.
The retracting operation is started by a command signal for the retraction. At first, the paper 
route change
 performs the paper path change operation to retract the cut sheet. When the 
solenoid
 linked with the frame, paper route change
 is energized, the frame, paper route 
change
 and the plate, route change guide
 move in direction A. After the paper route 
change sensor
 detects the end of the paper route change operation, the motor, paper feed 
receipt, B
 begins to rotate in the counterclockwise direction; then through the gears, the roller, 
cut sheet presenter
 and the roller, retract
 inside the retracting paper route rotate and the cut 
sheet is retracted into the unit through the retracting paper route. The retracted cut sheet will fall 
to the bottom of the cut sheet presenter module.
roller, cut sheet hold
cut sheet
roller, cut sheet presenter 
						

							2-18   Operation Principles Rev. A
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Figure 2-26  Retract Function
Detector Mechanism
The detector mechanism consists of the cover, open sensor
, the carried paper sensor
, the 
cut sheet presence sensor
, the paper path change sensor
, and the retracted paper 
sensor 1
. 
Cover open sensor
This sensor detects whether the upper frame, cut sheet presenter unit
 is open or not.
Carried paper sensor
This sensor detects the paper presence in the paper carrying route.
Cut sheet presence sensor
This sensor detects whether or not a recipient has taken the cut sheet.
Paper path change sensor
This sensor detects the retracted paper route change when the cut sheet is not taken.
Retracted paper sensor 1
This sensor detects the paper presence in the retracted paper route. 
cut sheet
retracted paper sensor 1
plate, paper route 
change guide
paper path change sensor
roller, retract
frame, paper route change 
						

							Rev. A Operation Principles   2-19 EU-T532/T542 Technical Manual
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Control Circuit Board Module
The control circuit board module controls all functions of each module and has the interface 
connectors and the power supply terminals. Each function can be set by using the DIP switches 
and the memory switches.
Figure 2-27  Appearance of the control circuit board module
DIP Switches 
The circuit board has two DIP switches (DSW 1/2). Each setting is as follows:
DIP Switch 1
*: Effective only when the serial interface is selected.
Table 2-1 DSW 1
SW No. FunctionON OFF
Default Setting
1 Black mark sensor Enabled Disabled
OFF
2
Interface selection
Refer to Table 2-2
3
4 Serial interface 
handshakingXON/XOFF DTR/DSR or
CTS/RTS
OFF* 5 Serial interface 
parity checkYes No
6 Serial interface 
parity selectionEven Odd
7
Serial interface 
baud rate selectionRefer to Table 2-3
8
DIP switch 1
DIP switch 2