DOT MATRIX PRINTER MECHANISM
MP111MP-24G-A
MP115MP-24G-A
SPECIFICATION
AND
OPERATION MANUAL
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Contents
1. GENERAL DESCRIPTION ................................................................................................................ 1
2. CONSTRUCTION ................................................................................................................................ 2
2.1
2.2
Configuration ........................................................................................................................... 2
Principle of Operation .............................................................................................................. 2
3. GENERAL SPECIFICATIONS .......................................................................................................... 5
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
Printing Specifications ............................................................................................................. 5
Paper Specifications ................................................................................................................. 6
Ink Ribbon Specifications ........................................................................................................ 7
Connector Specifications ......................................................................................................... 9
Print Timing ........................................................................................................................... 11
Timing Chart .......................................................................................................................... 12
Print Head Specifications....................................................................................................... 14
CR Motor Specifications........................................................................................................ 18
Paper Feed Motor Specifications ........................................................................................... 20
3.10 Ribbon Shift Solenoid (RS-SOL) Specifications................................................................... 21
3.11 Timing Signal Detector Specifications .................................................................................. 22
3.12 Home Position Detector (HP-sig) Specifications .................................................................. 23
3.13 Paper-out Detector (PE-sig) Specifications ........................................................................... 23
3.14 Ribbon Position Detector (RS-sig) Specifications (MP115MP only) ................................... 24
3.15 Dimension and Weight .......................................................................................................... 24
4. RELIABILITY SPECIFICATIONS ................................................................................................. 27
5. SETTING THE RIBBON CARTRIDGE ......................................................................................... 28
6. SETTING THE PAPER ..................................................................................................................... 29
6.1
6.2
Setting the Paper .................................................................................................................... 29
Removing the Paper ............................................................................................................... 29
7. INSTALLATION ................................................................................................................................ 30
8. OPERATIONAL NOTES .................................................................................................................. 35
8.1
8.2
8.3
Power ON/OFF Note ............................................................................................................. 35
Carriage Motor Protection Method (Against Mechanical Errors) ......................................... 36
Other Notes ............................................................................................................................ 36
9. POWER SUPPLY CAPACITY ......................................................................................................... 37
9.1
9.2
24 V Line ............................................................................................................................... 37
5 V Line ................................................................................................................................. 37
10.OPTIONS............................................................................................................................................. 38
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1. GENERAL DESCRIPTION
MP111MP-24G-A and MP115MP-24G-A are serial impact dot matrix printer mechanisms used to record
data and as electrical equipment such as for ECR.
Model Name Notation
MP1
1
1
M
P
-
24
G
- A
G: FG compatible
Voltage
24 : 24 VDC
Paper-out detector
P : Includes the paper-out detector
Paper feed method
M : Friction method and stepping motor
Mechanism type
1 : Monochromatic, 16.9 CPI, 32 columns per line
5 : 2 colors, 16.9 CPI, 32 columns per line
Printer type
1 : Type 1
MP100 Series printer mechanism
– 1 –
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2. CONSTRUCTION
2.1 Configuration
This printer mechanism is composed of the following components.
Printer mechanism
Drive unit, gears, and carriage unit
Detectors
Timing detector
Home position detector
Paper out detector
Paper feed mechanism
Ink ribbon wind mechanism
Print head unit
Frame unit
Other
You can also use 1.75 inch (45 mm) width roll paper by removing the paper guide B and attaching the optional
guide.
2.2 Principle of Operation
2.2.1 Drive
This printer mechanism moves the print head, feeds paper and feed ribbon with the motor.
2.2.2 Print head movement
The rotation of the motor is transmitted to drive shaft through the reduction gears. The carriage makes lateral
reciprocal movements along a groove that is carved on this drive shaft, consequently moving the print head.
2.2.3 Print timing
Printing is done when the timing signal is generated synchronized with the rotation of the motor, based on the
home position signal.
2.2.4 Ribbon feed
The ink ribbon is housed inside a ribbon cartridge in endless fashion. A ribbon feed roller is turned by the
rotation of the motor whereby the ink ribbon is wound up.
2.2.5 Paper feed
Paper feeding is done by the rotation of the stepping motor.
– 2 –
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Fig. 2-1 MP111MP External view
– 3 –
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Fig. 2-2 MP115MP External view
– 4 –
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3. GENERAL SPECIFICATIONS
3.1 Printing Specifications
Item
Specifications
Printing method
Printing configuration
Printing direction
Printing speed
Printing lines
Impact Dot Matrix
7 x 9 (half dot) or 5 x 9
Bidirectional (See note 1)
Approximately 3.85 lines/second
32 lines (when using 7 x 9 half dots)
Width 1.2 mm (when using 7 x 9 half dots) Height 2.42 mm
Horizontal 0.3 mm (with full dots) Vertical 0.353 mm
48 mm
Character dimension
Dot spacing
Printing area
Paper feed speed
Wire diameter
Line space
Approximately 3.77 in./sec. (continuous feeding)
ø 0.3 mm
1/6, 1/8, 1/12, 1/72, 1/144 inches
Feed paper more than one line before printing graphics or vertically
expanded characters.
Note 1: When performing bidirectional printing, horizontal drift is likely to occur in unidirectional printing.
Details of Character Dimentions
1 Paper width
2.25 inches (57.5 mm)
1.75 inches (44.5 mm) Optional
2 Fonts configuration (H x V)
7 x 9
(half)
16.9
32
5 x 9
7 x 9
(half)
16.9
24
5 x 9
3 CPI
14.1
26
14.1
20
4 Printing column count
5 Spacing
e mm
1.5
1.8
1.5
1.8
6 Character dimensions c mm
d mm
1.2
1.5
1.2
1.5
2.42
0.3
2.42
0.3
2.42
0.3
2.42
0.3
7 Dot space
a mm
b mm
0.353
160
48
0.353
156
46.8
0.353
120
36
0.353
120
36
8 Total no. of dots
9 Printing area
mm
Fig. 3-1 Character Size (7x 9 font)
– 5 –
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3.2 Paper Specifications
Item
Paper type
Paper width
Roll diameter
Thickness
Specifications
Ordinary roll paper (1P) and carbonless roll paper (2P or 3P)
57.5 ± 0.5 mm (2.25 inch). With options, 44.5 ±0.5 mm(1.75 inch) possible
Max. 85 mm (3.35 inch)
Single : 0.07 mm to 0.10 mm
Copies : Original + 1 copy
Total thickness max. 0.14 mm, with each sheet 0.05 to 0.08 mm thick
Original + 2 copies
Total thickness max. 0.2 mm, with each sheet 0.05 to 0.08 mm thick
Core diameter
Other
12 ± 1 mm
No glue between the paper and the core diameter
Fig. 3-2 Paper spec. & Print area
– 6 –
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3.3 Ink Ribbon Specifications
1) MP111
Item
Specifications
Type
Dedicated cartridge
Color
Purple (standard)
Nylon 66
Ribbon material
Ribbon size
Model name
Width: 13 mm
Purple (standard): Ribbon cassette RC100 P
Black (optional): Ribbon cassette RC100 B
Ribbon life
Purple:
Black:
Approx. 1,500,000 characters
Approx. 800,000 characters
Note: There is the possibility of damaging the printer by using ribbon cassettes that have not been speci-
fied. We do not offer warrantee for problems that occur from using the wrong ribbon cassette.
Fig. 3-3 Ink ribbon cartridge (RC100 P.B.)
– 7 –
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2) MP115
Item
Specifications
Type
Dedicated cartridge
Black and red
Color
Ribbon material
Ribbon size
Model No.
Ribbon life
Nylon 66, (#40 denier)
Width: 13 mm
Black and red: Ribbon cassette RC100BR
Black:
Red:
Approx. 400,000 characters
Approx. 250,000 characters
Note: There is the possibility of damaging the printer by using ribbon cassettes that have not been speci-
fied. We do not offer warrantee for problems that occur from using the wrong ribbon cassette.
Black
Red
Fig. 3-4 Ink ribbon cartridge (RC100BR)
– 8 –
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3.4 Connector Specifications
Connector Type
NIPPON FCI
HLEM28R-1
Connection Drawing See next page
1
2
3
4
5
6
7
8
9
HD #6
HD CMN
HD #4
HD #5
HD #1
HD CMN
HD #2
HD #3
HD CMN
10 HD #7
11 HD #8
12 HD #9
13 LF-ø4
14 LF-CMN A, B
15 LF-ø2
16 LF-ø1
17 LF-ø3
18 RS-Sig (Ribbon shift) MP115M only
19 S-GND
20 PE-Sig
21 CR MOTOR (–)
22 HP-Sig
23 RS-SOL (Ribbon shift) MP115M only
24 T2-Sig
25 T1-Sig
26 +5V
27 NC
28 CR MOTOR (+) (CMN VH)
– 9 –
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LF-ø1
16
14
17
15
M
LF-CMN A,B
LF-ø3
LF-ø2
LF-ø4
13
+5V
26
25
24
T1-sig
T2-sig
HP-sig
PE-sig
22
20
(RS-sig) *1
S-GND
18
19
(
)
RS-SOL *1
23
( )
CR MOTOR +
28
27
21
(
(
))
CMN VH
NC
( )
CR MOTOR -
M
*1 MP115MP only
Fig. 3-5 Connector connections
– 10 –
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3.5 Print Timing
This printer uses a timing signal of 1 as the total number of pulses to control the solenoid and motor. The
numbering of Tn of the timing signal 1 is found as shown below. The first timing signal 2 after the rise of the
home position signal is detected and the fall of the first timing signal 1 after the rise of timing signal 2 is set
as T-1. The subsequent timing signal falls are set as T0, T1 and T2.
You should be careful of the following points concerning this print timing.
There is a minimum of 2 pulses for the timing signal 1 for electrical cycles for the same pin. Therefore, you
cannot energize Tn, Tn+1 using the same pin.
7✕9 (half) font
Forward printing
T2 T4 T6 T8 T10 T12 T14 T16 T18 T20 T22
T1 T3 T5 T7 T9 T11 T13 T15 T17 T19 T21
T312T314T316T318T320T322
T311T313T315T317T319T321
1st chara
2nd chara
32th chara
Normal character
Rotated character
1 3 5 7
2 4 6
1 3 5 7
2 4 6
1 3 5 7
2 4 6
7 5 3 1
7 5 3 1
7 3 1 1
6 4 2
6 4 2
6 4 2
1st chara
31th chara
32th chara
Backward printing
T754T752T750T748T746T744T742T740T738T736T734
T753T751T749T747T745T743T741T739T737T735T733
T444T442T440T438T436T434
T443T441T439T437T435T433
Note ) The electric cycles for identical 1 pins has 2 pulses or more.
There Tn, Tn+1 electricity is impossible
5✕9 font
Forward printing
T2 T4 T6 T8 T10 T12 T14 T16 T18 T20 T22
T310T312T314T316T318T320T322
T1
T11
T13 T15 T17 T19 T21
T3 T5 T7 T9
T309T311T313T315T317T319T321
2nd chara
1st chara
26th chara
Normal character
Rotated character
1 2 3 4 5
1 2 3 4
1 2 3 4 5
5 4 3 2
5 4 3 2 1
1st chara
26th chara
Backward printing
T754T752T750T748T746T744T742T740T738T736T734
T753T751T749T747T745T743T741T739T737T735T733
T446T444T442T440T438T436T434
T445T443T441T439T437T435T433
Fig. 3-6 Print Timing
– 11 –
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ON
After print
Motor OFF Timing
MOTOR
OFF
HIGH
LOW
HP-sig
T2-sig
HIGH
LOW
T-1
T0 (T863)
T1
T0 T2 T4
T-1 T1 T3
T322 T323
T433
T490
T754 T755
HIGH
LOW
T1-sig
Carriage reversal
Carriage reversal
area
area
(110 pulses)
(110 pulses)
TYP. 66.3 ms
MIN. 64.3 ms
TYP. 66.3 ms
MIN. 64.3 ms
Backward print area
(322 pulses)
Forward print area (322 pulses)
Forward print area
PRINT
ON
PF MOTOR
1/6 Inch = 24 Steps
T1-sig: Type 1660 Hz, Max. 1710 Hz (Software and CPU should be designed at Max. 2000 Hz.)
Printing speed: T1-sig 1600 Hz = Approximately 3.84 lines/sec. 1710 Hz = 3.96 lines/sec.
Paper feed action must be carried out within the carriage reversal area.
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(2) Ribbon Shift Operation (Only with 2 color printing on the MP115)
Release Action
ON
MOTOR
OFF
T1 T2T3
T30
T336
HIGH
TIMING SIG-1
LOW
ON
RIBBON SHIFT
18 Pulses
OFF
ROTATE
RIBBON SHIFT GEAR
288 Pulses
STOP
Ribbon shift gear rotation:
18 x 6 x 32/12 = 288 pulses
Fig. 3-8 Release action
– 13 –
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3.7 Print Head Specifications
(1) Basic Specifications
Item
Specifications
Supply voltage
Response frequency
Energized time
Coil resistance
Peak current
24 VDC ± 2.4 V
Max. 900 Hz
See below
14.7 ± 0.4 Ω (includes cable resistance)
1.0 A/solenoid (for 24 VDC, 375 µs)
Timing
Energizing is begun at the fall of the output signal of timing signal 1.
Energizing cycle shall be 2 pulses or more of timing signal 1.
Typ.
Max.
1.1 A
Peak current
Condition
1.0 A
24 V
375 µs
26.4 V
340 µs
ff delay time (td): 2 µs
Fig. 3-9 Current waveform
(µs)
415
395
375
355
340
21.6
22.8
24
25.2
26.4 (V)
Voltage
Fig. 3-10 Head Energizing Time - Head Power Supply Voltage
– 14 –
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We employ a zener diode to control spike voltages that occur when the transistor is turned OFF. The following figure
shows and example of the drive circuit. With this circuit, we use a transistor equipped with a zener diode (zener voltage
60 + 10/-5V) between the base and collector.
TR1 2SD2041 (ROHM)
R1
R2
VH
1K Ω
330Ω
HV (24 V)
23V + TR1 for VCE (sat)
Fig. 3-11 Example of Print Solenoid Drive Circuit
– 15 –
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(2) Pre-fire
This operation applies minute vibrations to the needle wire to allow for its smooth movement as printer warmup.
Pre-fire is performed under the following conditions. The energizing time is too short to allow for the printing
action to occur.
Operating time
Frequency
When power is turned ON.
900 Hz
Number of times
32 Times
Power supply voltage DC24V ±2.4 V
Energizing time 175 ± 5 µs
(3) Print Duty
This print head is not equipped with a head temperature detector. Therefore, use the printer within the maxi-
mum printing ratio shown below. If you print exceeding this printing ratio, you can damage the printer.
Ambient Temperature 25°C
1140
Print Ratio N
(dot /sec)
Ambient Temperature 50°C
830
21.6 V
24.0 V
26.4 V
Fig. 3-12 Print duty
The figure above shows the print duty that is possible with continuous printing when each wire is used an
equivalent number of times. In this case, you can calculate the possible dot count for D per character using the
following numerical formula.
N (Print Ratio) x T (Print time per line includes the time of the paper feed [sec])
L (number of character per line)
[dot/chara]
– 16 –
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When you use the specific wires many times, make sure the maximum print ratio is not over the print duty shown in Fig.
3-13. Fig. 3-13 shows operation at 24.0V.
1200
1100
1000
900
(1200)
Ambient
Temperature 25°C
(1155)
1100
(1030)
(730)
950
680
890
(850)
800
(840)
(785)
750
700
600
(615)
500
380
550
Ambient
Temperature 50°C
500
400
1
2
3
4
5
6
7
8
Number of the specific wires
Fig. 3-13 Print duty (specific wires)
– 17 –
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3.8 CR Motor Specifications
Item
Specifications
Type
DC motor
Supply voltage
Start current
Average current
24 VDC + 1.2 V
Max. 1.6 A
Approx. 0.15 A
– 18 –
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Fig. 3-15 Motor drive circuit (example)
Notes: Adjust motor speed with VR
R1 10 KΩ
R2 3.3 KΩ
R3 6.8 KΩ 1/6 W
R4 2.2 KΩ
TR1 2SA950
adjustment and T1 signal to
TR2 2SC1740
TR3 2SA1175
TR4 2SD882
1660 Hz ± 30 Hz.
R5 1.2 KΩ
R6 10 KΩ
R7 20 KΩ
C1 0.47 µF (Film)
C2 0.033 µF (Film)
C3 0.022 µF (Film)
TR5 2SB1359
TR6 2SD1637
IC1 SN74LS05
IC2 M51971L (MITSUBISHI)
VR 6.8 KΩ
3.8.1 FG Circuit
The motor control circuit with a Frequency Governor circuit maintains the printing speed at the settings. It is
mainly constructed of a Speed Control IC (IC2) and a Power Transistor TR6 shown in Fig. 3-15. It measures
the number of rotations of the Carriage Motor from the Timing Signal 1. This signal is then compared to the
standard signal to control the speed by controlling the voltage energizing the Carriage Motor.
3.8.2 Merits of the FG Circuit
The FG circuit maintains a stable output regardless of the environment where it is being used.
It maintains stability even at high speeds.
It protects the head because the speed is stable.
– 19 –
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3.9 Paper Feed Motor Specifications
Item
Specifications
Type
PM type stepping motor
2-Phase excitation unipolar method
Drive method
Terminal voltage
Peak current
Average current
Holding current
24 VDC ± 1.2 V (for drive), 4.2 VDC (when holding)
Max. 0.7 A
About 0.28 A
About 0.08 A
Amount of paper feed 1/144 inch per 1 step
Feed method
Forward feed only
Excitation signal
a. When paper feed amount is less that 4 steps.
Set to 350 pps drive.
b. When paper feed amount is over 5 steps and less than 8 steps. Set the slow-
down area so that the final 2 steps become 300 pps and 200 pps. The other
areas are set to 350 pps drive.
c. When paper feed amount is over 9 steps and less than 18 steps. Set the inital
4 steps so that they become 350 pps (slow-up area). Set the slow-down area
so that the final 4 steps become 500 pps, 400 pps, 300 pps, and 200 pps.
The other areas are set to 550 pps drive.
d. When paper feed amount is over 19 steps.
Set the initial and final 4 steps so that they become 350 pps. The other areas
are set to 550 pps drive.
VH 24 V
D1 DSM1D1 (HITACHI)
TA1 µPA1428AH (NEC)
TR1 2SB1359 Compatible
TR2 2SC1740 Compatible
R2 to R3 10 kΩ
D1 DSM1D1 (Hitachi)
IC SN74L04
15
13
Fig. 3-16 Drive circuit of paper feed motor (example)
– 20 –
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3.10 Ribbon Shift Solenoid (RS-SOL) Specifications
MP115MP only
Item
Specifications
Supply voltage
Pulse width
24 VDC ± 1.2 V
T1-sig 18 pulses (Approx. 12 ms)
Approx. 57.0 Ω
Coil resistance
Average current
Approx. 400 mA
Fig. 3-17 Current waveform of RS-SOL
Fig. 3-18 RS-SOL drive circuit (example)
TR1
2SD2010 (ROHM)
D1
R1
R2
VH
DSM1D1
1 kΩ
330 Ω
23 V + TR1 VCE (sat.) = 24 V
– 21 –
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3.11 Timing Signal Detector Specifications
The timing signal detector is composed of a detection slit mounted on the motor shaft, a photo interruptor,
and waveform shaping circuit.
Timing signal 1 is generated 18 pulses and timing signal 2 is generated 1 pulse every time the motor rotates
by 1 turn.
PS
Photo interruptor
ON1004R
(MATSUSHITA)
TR1
R1
2SC1740
4.7 kΩ
56 kΩ
R2
R3
150 Ω
C1
2200 PF
Fig. 3-19 Circuit of timing signal 1 (example)
PS
Photo interruptor
ON1004R
(MATSUSHITA)
TR1
R1
2SC1740
4.7 kΩ
56 kΩ
R2
R3
150 Ω
C1
2200 PF
Fig. 3-20 Circuit of timing signal 2 (example)
– 22 –
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3.12 Home Position Detector (HP-sig) Specifications
The home position detector is composed of the mechanical switch. While the carriage is located at the left
end, the switch remains ON.
R1
R2
C1
10 kΩ
15 kΩ
0.022 µF
Fig. 3-21 Home position detector circuit (example)
In order to improve reliability, we recommend that the HP-sig is detected as described below.
(1) When the T1-sig is unstable when turning on the power, etc.
Detect the L level after having detected the H level of the HP-sig, and then, after having carried out 81
pulse counts for the T1-sig, detect the H level.
(2) When the T1-sig is decided during continuous operation of the motor
Detect the L level of the HP-sig, and then, after having counted 847 pulses of the T1-sig, detect the H
level.
3.13 Paper-out Detector (PE-sig) Specifications
The Paper-out Detector is composed of a mechanical switch. While the paper is set in the paper tray, the
switch remains ON.
R1
R2
C1
10 kΩ
15 kΩ
0.022 µF
Fig. 3-22 Paper-out detector circuit (example)
– 23 –
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3.14 Ribbon Position Detector (RS-sig) Specifications (MP115MP only)
The ribbon position is made up by a mechanical switch.
When the ribbon is at the position for printing of black characters, the switch is ON.
R1
R2
C1
10 kΩ
15 kΩ
0.022 µF
Fig. 3-23 Example of ribbon position detection circuit
In order to improve the reliability, we recommend that the RS-sig is detected while the motor is off.
3.15 Dimension and Weight
See Fig on the next page for external dimension of the printer mechanism.
Weight of printer mechanism:
MP111MP, approx. 410 g (excludes the ribbon cartridge)
MP115MP, approx. 450 g (excludes the ribbon cartridge)
Weight of ink ribbon cartridge: approx. 24 g
– 24 –
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Paper Entrance
Paper Entrance
Paper Entrance
Paper Entrance
Figure 3-24 MP111MP External dimension (unit: mm)
– 25 –
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Paper Entrance
Paper Entrance
Paper Entrance
Paper Entrance
Figure 3-25 MP115MP External dimension (unit: mm)
– 26 –
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4. RELIABILITY SPECIFICATIONS
Item
Specification
Remarks
Printer reliability 4 million lines MCBF
Except print head life
14 dots per character
Recommended ribbon:
Purple color ink ribbon car-
tridge (RC100 P)
Life
Print head life
Approx. 70 million characters
After being left under this
environment for two hours,
the printer mechanism must
satisfy general specification.
Temperature 0°C to 50°C
Operating
environment
R e l a t i v e 10 to 80% RH (at 40°C)
humidity
(no condensation)
After being left under this
environment 96 hours, and
under normal temperature
and humidity for two hours,
the printer mechanism must
satisfy general specification.
Temperature -20°C to +70°C
S t o r a g e
environment
R e l a t i v e 5 to 95% RH (at 40°C)
humidity
(no condensation)
Vibration : 10 ~ 55 ~ 10 Hz
Amplitude : 1.54 mm (at regular range)
Sweep
Gravity : 0.3 ~ 9.3 G
Direction : X,Y and Z directions
Test time : Two hours in each direction
(Six hours in three directions)
: one minute
The printer must satisfy gen-
eral specification after test-
ing.
Vibration test
Packing : With the least packing unit
Height
Order
: 85 cm
: 1 corner, 3 edges, and 6 sur-
faces
The printer must satisfy gen-
eral specification after test-
ing.
Shock test
Packing : With the least packing unit
When you put the printer
mechanism to the quality
control test, use the printer
under the environment as
shown at the left.
Insulation resistance
1 MΩ (100 VDC)
– 27 –
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5. SETTING THE RIBBON CARTRIDGE
1. Turn the ribbon feed knob of ribbon cartridge in the direction of the arrow to remove slack in the ribbon.
2. Place the ribbon cartridge and press it to set in the Unit. When the ribbon cartridge is hard to set to the
proper position, turn the ribbon feed knob in the direction of the arrow.
Insert the ink ribbon between the print head and the platen.
3. Turn the ribbon feed knob of ribbon cartridge in the direction of the arrow to remove slack in the ribbon.
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6. SETTING THE PAPER
6.1 Setting the Paper
1. Cut straight the leading edge of the paper.
2. Insert the paper squarely into the paper guide.
3. Turn the paper feed motor to feed the paper.
4. When the paper comes out of the paper outlet, turn the feed motor off, and stop the paper feed.
6.2 Removing the Paper
1. Cut the paper behind the paper guide.
2. Turn the paper feed motor to remove the paper.
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7. INSTALLATION
1. At the time of mounting the printer mechanism into its housing cabinet, put cushion material, such as,
rubber foot, on the printer mechanism legs. If installed directly, reverberations occur producing noise.
We recommend that you use the following rubber foot.
Parts name : DAMPER RUBBER
SP2
Parts No. : 30290010
Fig. 7-1 Recommended Rubber foot
Parts name : SCREW 3.0
Parts No. : 30250010
Fig. 7-2 Recommended Set screw (unit: mm)
2. Set the play between the roll paper holder and paper thrust direction to within 2 mm, and ensure that the
roll paper holder doesn’t hold back the edge of paper.
3. Set the paper inserting angle to within 65°.
4. Edges around the paper insertion area should be rounded at R2 mm or more.
5. Set the paper feed load, at the printer’s paper inlet, to 30 g or less.
6. Take into account prevention of paper rewinding, when designing the case.
7. Allow needed space surrounding the printer. Fig. 7-3 shows an example of installation space.
8. Fig. 7-4 shows an example of installation.
9. Since this printer mechanism employs galvanized steel panels, the end surface doesn’t come plated.
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Mechanism Attachment
Position (4 Places)
Paper Exit
Paper Entrance
Paper Entrance
(Paper Tube
Inner Diameter
Roll Diameter
Screw 3.0
Vibration Isolation
Rubber SP2
Frame
Chassis
Sectional View of Paper Holder AA
Fig. 7-3 Installation space (example) (unit: mm)
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Mechanism Attachment
Position (4 Places)
Paper Exit
Paper Entrance
Paper Entrance
Roll Diameter
Screw 3.0
Vibration Isolation
Rubber SP2
Frame
Roll Diameter
Chassis
Sectional View of Paper Holder
Fig. 7-4 Printer installation (example) (unit: mm)
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Mechanism Attachment
Position (4 Places)
Paper Exit
Paper Entrance
Paper Entrance
Roll Diameter
Screw 3.0
Vibration Isolation
Rubber SP2
Frame
Chassis
Sectional View of Paper Holder
Fig. 7-5 Printer installation (Placing the roll paper without using the roller.)
– 33 –
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Fig. 7-6 Printer installation
– 34 –
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8. OPERATIONAL NOTES
8.1 Power ON/OFF Note
If the 5 V power supply line for logic has not fully risen or fallen immediately after the power supply is
turned ON or OFF, the CPU or TTL in the logic circuit may misoperate. At such times, power is supplied to
the motor or solenoid, causing, in the worst case, burnt out solenoid or running of motor (misoperation),
unless the 24 V power supply line for motor drive is completely OFF. To avoid such misoperation, take into
account the following points.
8.1.1 Power supply ON/OFF timing rule
Supply 24 V line after the 5 V line has fully risen. Similarly, cut off the 5 V line after the 24 V line has fully
fallen.
Fig. 8-1 Power supply ON/OFF timing rule
8.1.2 Method of controlling the drive circuit
Fig. 8-2 Drive circuit controlling method
If the power supply ON/OFF timing rule cannot be followed, reset the print solenoid or motor drive circuit
with control signal. An example of this type of circuit is shown in Fig. 8-3. Turn OFF transistor TR1, while
the 5 V line has not completely risen, in order to inhibit power to the print solenoid. Then as soon as the 5 V
line has completely risen, turn ON TR1, permitting power to the print solenoid.
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TR1
2SD2041 (ROHM)
HRT Type
R1
R2
1 kΩ
330 Ω
VH
23 V+VCE (Sat.) of
TR1=24 V
Fig. 8-3 Circuit to control drive circuit (example)
8.2 Carriage Motor Protection Method (Against Mechanical Errors)
If the carriage motor gets locked as a result of trapping foreign matter, etc. in the printer mechanism, a risk
of damaging the motor due to flow of excess current to it is generated. Therefore, it becomes necessary to
monitor the excess load status of printer mechanism, by detecting the cycle of timing signal 1 with timer,
etc. Once the cycle of timing signal 1 becomes as given below, stop power being supplied to the motor.
a. Print interval: 2.57 ms or more/450 µms or less
b. Outside print interval: 257 ms or more
8.3 Other Notes
1. Do not attempt to print when the paper or ribbon cartridge are not loaded in the printer mechanism as
this could damage the print head.
2. Do not store or use the printer mechanism at places of substantial dust, iron content, etc., or in oily
atmosphere.
3. Wipe off dust, dirt, etc. from the printer mechanism, using a soft brush. Or, wipe with a piece of cloth
dampened in alcohol.
4. Never inflict strong force on the printer mechanism. Otherwise, the frame or other parts may be dis-
torted, rendering normal functioning impossible.
5. Avoid sudden changes in the ambient conditions like temperature, humidity, etc. even while they are
hold in prescribed limits. If sudden change occurs, allow about 30 minutes for acclimatizing, before
using the printer mechanism.
6. Never use the printer mechanism with condensation deposited onto it.
– 36 –
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9. POWER SUPPLY CAPACITY
9.1 24 V Line
Arrange for the following power supply, taking into account the voltage drop (about 1 V) of VCE (sat) of the
power transistor for driving print solenoid.
Power supply voltage 23V+1V = 24V ± 10 %
Similarly, arrange for 2.0 A or larger power supply capacity; and connect an electrolytic condenser of 4700
µF to 6800 µF/35 V to the power source.
9.2 5 V Line
Arrange for 5 V power supply for the detector (photo interruptor).
Voltage
5 V ± 5 %
Current consumption
Approx. 60 mA
– 37 –
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10. OPTIONS
You can also use 1.75 inch (44.5 mm) width roll paper by removing the paper guide B and attaching the
optional guide C.
(1) Removing the Paper Guide B
Spread the boss unit on both sides of the paper guide B and remove the the boss from the paper guide
A side. Rotate the paper guide B and remove it.
(2) Setting the Paper Guide C
When you remove the paper guide B, you can see the groove at the right side of the paper guide A.
Insert the paper guide C into that groove.
Fig. 10-1 Paper Guide Option
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HEAD OFFICE
ELECTRONIC PRODUCTS DIVISION
STAR MICRONICS CO., LTD.
536 Nanatsushinya, Shimizu,
Shizuoka, 424-0066 JAPAN
Tel : 0543-47-0112
OVERSEAS SUBSIDIARY COMPANIES
STAR MICRONICS AMERICA, INC.
70-D Ethel Road West,
Piscataway, NJ 08854 U.S.A.
Tel : 732-572-9512
STAR MICRONICS U.K. LTD
Star House, Peregrine Business
Park, Gomm Road, High Wycombe,
Bucks, HP13 7DL, U.K.
Tel : 01494-471111
Fax: 0543-48-5271
Fax: 732-572-5095
Fax: 01494-473333
Please access the following URL
for the lastest revision of the manual.
Distributed by
Printed in Japan, 80874315
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