Citizen BD2-3880 User manual

CONTROL BOARD FOR MLT-388/MLT-389
MODEL BD2-3880/3890
Rev. 1.00 Newly Issued on October 22, 2004
User’s Manual

i
REVISION
Rev. No. Date Content
1.00 2003.06.23 Issued as first edition.
1.00 2004.10.22 “3.3 CN3 Connector for Interface” changed

ii
CONTENTS
1. OUTLINE ....................................................................................................................... 1
1.1 Features ............................................................................................................................................................ 1
1.2 Precaution ......................................................................................................................................................... 1
2. BASIC SPECIFICATIONS .......................................................................................... 2
2.1 Model Classification ......................................................................................................................................... 2
2.2 Basic Specifications.......................................................................................................................................... 3
3. CONNECTING CONNECTORS................................................................................. 4
3.1 CN1 Connector for Printer Mechanism............................................................................................................ 4
3.2 CN2 Connector for Print Mechanism ............................................................................................................... 5
3.3 CN3 Connector for Interface ............................................................................................................................ 6
3.4 CN201 Connector for Paper Cutter (Option) ................................................................................................... 7
4. SELECTING FUNCTIONS ......................................................................................... 8
5. POWER SUPPLY ........................................................................................................ 10
5.1 Specifications ................................................................................................................................................. 10
5.2 Precautions ..................................................................................................................................................... 10
6. PARALLEL INTERFACE .......................................................................................... 11
6.1 Specifications ................................................................................................................................................. 11
6.2 Explanation of Input/Output Signals .............................................................................................................. 11
6.3 Electrical Characteristics ................................................................................................................................ 12
6.4 Timing Chart (Compatibility Mode) .............................................................................................................. 13
6.5 Data Receiving Control .................................................................................................................................. 13
6.6 Buffering......................................................................................................................................................... 13
7. SERIAL INTERFACE ................................................................................................ 14
7.1 Specifications ................................................................................................................................................. 14
7.2 Explanation of Input/Output Signals .............................................................................................................. 15
7.3 Error Detection ............................................................................................................................................... 15
7.4 Data Receiving Control .................................................................................................................................. 16
7.5 Buffering......................................................................................................................................................... 16
7.6 Electrical Characteristics ................................................................................................................................ 16

iii
8. ERROR HANDLING .................................................................................................. 17
8.1 Peripheral Circuit Errors ................................................................................................................................ 17
8.2 Operation Errors ............................................................................................................................................. 18
8.3 Error Indication .............................................................................................................................................. 19
9. PRINTER MECHANISM CONTROL SYSTEM .................................................... 20
9.1 Thermal Head Control System ....................................................................................................................... 20
9.1.1 Fixed Division Number System ................................................................................................................ 20
9.1.2 Variable Division Number System ............................................................................................................ 20
9.2 Motor Drive .................................................................................................................................................... 21
9.2.1 Motor Drive Features ................................................................................................................................ 21
9.2.2 Maximum Motor Drive Speed at Major Voltage ....................................................................................... 21
10. MAINTENANCE AND SERVICE ........................................................................... 22
APPENDIX 1. BLOCK DIAGRAM .............................................................................. 23
APPENDIX 2. OUTER DIMENSION ........................................................................... 24

BD2-3880/3890 User’s Manual
1
1. OUTLINE
This control boards is designed to be used to control our thermal printer, “MLT-388/389” series
through the computer etc.
As being provided with many abundant functions, it can be used widely in various applications.
Before you start using it, read this manual thoroughly and understand the content.
1.1 Features
(1) Ultra compact
(2) Both interface of Serial and Parallel can be selected by dip switch.
(3) Input buffer incorporated.
(4) Bar code printing is available (dedicated command).
(5) Auto paper cutter control incorporated (option).
(6) User-defined character registration function (94 characters)
(7) Low cost
1.2 Precaution
(1) Make sure to turn OFF the power supply in case of connecting/disconnecting the connectors.
(2) Absolutely do not make a short circuit between the terminals of connectors.
(3) Use power supply, LED, interface, etc. following their specifications.
(4) Use the recommended paper shown below.
• Thermal Paper TF50KS-E2D (Nippon paper)
KF50-HDA (Shin-Oji paper)
F220VP (Mitsubishi paper) or the equivalent

BD2-3880/3890 User’s Manual
2
2. BASIC SPECIFICATIONS
2.1 Model Classification
Models are identified by the following coding scheme:
BD2 - 3890 U C
Character Set
U : Internatiomal model
Model Name of applied printer mechanism
3880 : For MLT-388
3890 : For MLT-389
Model Name
Auto Cutter Drive
C : With auto cutter function
None : Without auto cutter function
* Printer model is specified by J8 (jumper).

BD2-3880/3890 User’s Manual
3
2.2 Basic Specifications
Printing system
Print width
Print Speed
Number of columns
Character dimensions
Character types
Bar code type
Line pitch
Interface
Input buffer
Supply voltage
Weight
Outer Dimension
Operating temperature
and humidity
Storage temperature and
humidity
Thermosensitive dot-matrix printing
72 mm/576 dots
7.2V: Approx. 60 mm/s within 64 dots, at 35°C or more
5V: Approx. 30 mm/s within 64 dots, at 63°C or more
Font A : 48 columns
Font B : 64 columns
Font A : 1.25 mm ×3.00 mm
Font B : 0.88 mm ×3.00 mm
Alphanumeric, international characters
UPC-A/E, JAN (EAN) 13/8 columns, ITF, CODE 39, CODE128, CODABAR
4.23 mm (Can be changed by command)
Serial (Conforms to RS-232C) or Parallel (Conforms to Centronics)
(Selectable by dip switch)
2 K bytes
Logic part: 5V ±5%
Drive unit: 4.2V ~ 8.5V
Approx. 40 g
80 mm (W) ×90 mm (D) (For height of component parts, see outer drawing.)
5 ~ 40˚C , 35 ~ 85% RH (with no dew condensation)
–20 ~ 60˚C , 10 ~ 90% RH (with no dew condensation)
Items Contents
Approx. 130 mA (At ANK slide printing)
Average: 1.5A (Peak: Approx. 4A)
Operating votage is 7.2 V (Max)
8.5 V is a voltage only right after charging.
8.5V cannnot be used for normal voltage.

BD2-3880/3890 User’s Manual
4
3. CONNECTING CONNECTORS
3.1 CN1 Connector for Printer Mechanism
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
VH
VH
SI
GND
TM
nSTRB 1
nSTRB 2
nSTRB 3
VDD
nLATCH
GND
nSTRB 9
CP
GND
nSTRB 8
nSTRB 4
nSTRB 5
nSTRB 6
GND
nSTRB 7
GND
GND
GND
VH
VH
VH
VH
VH
––
––
Output
––
Input
Output
Output
Output
––
Output
––
Output
Output
––
Output
Output
Output
Output
––
Output
––
––
––
––
––
––
––
––
Function
Power for print head
Power for print head
Head data output signal
GND
Thermistor
Strobe 1
Strobe 2
Strobe 3
Thermal head logics power (+5V)
Latch signal
GND
Strobe 9
Clock pulse
GND
Strobe 8
Strobe 4
Strobe 5
Strobe 6
GND
Strobe 7
GND
GND
GND
Power for print head
Power for print head
Power for print head
Power for print head
Power for print head
Pin No. Signal Name I/O
Applicable Connector: 52806-2810 (Molex)
* First “n” of si
g
nal name indicates “L” active si
g
nal.

BD2-3880/3890 User’s Manual
5
3.2 CN2 Connector for Print Mechanism
1
2
3
4
5
6
7
8
9
MOTOR B
MOTOR A
MOTOR B
MOTOR A
PE C
GND
PE A
H-UP
GND
Output
Output
Output
Output
Input
––
––
Input
––
Function
Operation signal for motor B
Operation signal for motor A
Operation signal for motor B
Operation signal for motor A
Photointerruptor collector (Paper sensor)
Photointerruptor emitter + cathode
Photointerruptor anode (Paper sensor)
Platen not mounted signal (MLT-389)
Head-up signal (MLT-388)
Head-up sensor GND
Pin No. Signal Name I/O
A
pp
licable Connector: 53047-0910
(
Molex
)

BD2-3880/3890 User’s Manual
6
3.3 CN3 Connector for Interface
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
VDD
VDD
GND
GND
VP
VP
VP
VP
VP
VP
P-GND
P-GND
P-GND
P-GND
P-GND
P-GND
LF-SW
ERROR
PEout
DTR
TXD
RXD
DSR
DATA0
DATA1
DATA2
DATA3
DATA4
DATA5
DATA6
DATA7
nSTB
BUSY
nFAULT
SELECT
PE
nACK
NC
NC
nRESET
––
––
––
––
––
––
––
––
––
––
––
––
––
––
––
––
Input
Output
Output
Output
Output
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Output
Output
Output
Output
Output
––
––
Input
Function
Power supply for circuit (5V)
Power supply for circuit (5V)
GND
GND
Power supply for operation
Power supply for operation
Power supply for operation
Power supply for operation
Power supply for operation
Power supply for operation
GND for operation
GND for operation
GND for operation
GND for operation
GND for operation
GND for operation
LF Switch input
ERROR LED output (Can be connected directly)
PE LED output (Can be connected directly)
Serial Interface DTR
Serial Interface TXD
Serial Interface RXD
Serial Interface DSR
Parallel Interface DATA0
Parallel Interface DATA1
Parallel Interface DATA2
Parallel Interface DATA3
Parallel Interface DATA4
Parallel Interface DATA5
Parallel Interface DATA6
Parallel Interface DATA7
Parallel Interface nSTB
Parallel Interface BUSY
Parallel Interface nFAULT
Parallel Interface SELECT
Parallel Interface PE
Parallel Interface nACK
No Connection
No Connection
Parallel Interface nRESET
Pin No. Signal Name I/O
Applicable Connector: 53313 - 4015 (Molex)
* First “n” of si
g
nal name indicates “L” active si
g
nal.

BD2-3880/3890 User’s Manual
7
CAUTION:
1. For LED of ERROR and PE, there is a resister of 330 Ωon the circuit side to make the
current value 10 mA. Please use LED with a forward voltage of approx. 2V. LED exceeding
10 mA may break a control board.
2. Power supply for circuit (VDD and GND) requires feeding to only one pin. However, power
supply for driver circuit (VP and P-GND) requires feeding to all pins to secure the capacity.
3. Serial interface equips a driver and receiver of RS-232C, make sure to use it at RS-232C
level.
4. RESET terminal is pulled up by 47 KΩ. Make sure to make this terminal NC, when this
terminal is not used.
5. LF-SW input circuit is as below.
3.4 CN201 Connector for Paper Cutter (Option)
VDD
47K
1K
CPU
CN3
1000 pF
17 Pin
1
2
3
4
M+
M–
GND
SW
Output
Output
––
Input
Function
Cutter motor operational signal M +
Cutter motor operational signal M –
GND
Cutter switch input signal
Pin No. Signal Name I/O
A
pp
licable Connector: 5267- 04A-X (Molex)
CAUTION: Use the specified Paper Cutter (Model Name: ACS-230-5V).

BD2-3880/3890 User’s Manual
8
4. SELECTING FUNCTIONS
DIP SWITCH
JUMPER
(1) Baud Rate
1-1
1-2
1-3
1-4
1-5
1-6
1-7
1-8
Auto Cutter
CR Mode
Print Density
Communication Mode
Baud Rate
Enable
LF Enable
XON/XOFF
Factory Setting
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
Disable
LF Disable
DTR/DSR
Pin No. Function ON
Combination with J-6. See Table (3)
See Table (1)
J1
J2
J3
J4
J5
J6
J7
J8
Font Selection
Paper Auto Loading
Print Drive System
Print Density
(Supplementary)
Not Used
Mechanism
Enable
Variable division
Factory Setting
Open (*1)
Open (*1)
Open (*1)
Short
Short
Short
Short
Short
Open
Disable
Fixed division
Pin No. Function Short
See Table (2)
Combination with DS1-3
See Table (3)
––
MLT-388 MLT-389
*1:
*2:
All are short circuited for overseas type (BD2-38XX U).
When MLT-389 is used, J-4 is left unused and no auto loading occurs regardless of whether the
jumper is short circuited or open.
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
––
1200 bps
2400 bps
4800 bps
9600 bps
19200 bps
1200 bps
2400 bps
4800 bps
9600 bps
19200 bps
1200 bps
2400 bps
4800 bps
9600 bps
19200 bps
DS1-8 DS1-7
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
DS1-6
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
DS1-5
Parallel Input
Serial Input
"
"
"
"
"
"
"
"
"
"
"
"
"
"
Input Method
––
None
"
"
"
"
Odd
"
"
"
"
Even
"
"
"
"
Parity Baud Rate

BD2-3880/3890 User’s Manual
9
CAUTION:
1. Input Buffer is 2k byte. (Fixed)
2. Serial data length is 8 bits. (Fixed)
3. If print tone is set at 2 or above, printing rate tends to be lowered.
(2) Font Selection
(3) Print Density
Open
Open
Open
Open
Short
Short
Short
Short
Open
Open
Short
Short
Open
Open
Short
Short
J-3 J-2
Open
Short
Open
Short
Open
Short
Open
Short
J-1
Japan (JIS)
Japan (Shift-JIS)
Sweden
Denmark 1
U.K.
Germany
France
U.S.A
International Character
OFF
OFF
ON
ON
Open
Short
Open
Short
DS3 J-6
Light
Standard
Slightly Dark
Dark
Print Density
0
1
2
3
Level
80%
100%
120%
150%
Print Density Rate

BD2-3880/3890 User’s Manual
10
5. POWER SUPPLY
5.1 Specifications
VDD : 5V ±5% Approx. 130 mA
VP : 4.2V ~ 8.5V Average: 1.5A (Peak: Approx. 4A) when 7.2V
Operating votage is 7.2V (Max)
8.5V is a voltage only right after charging. 8.5V cannot be used for
normal voltage.
5.2 Precautions
(1) Design the product to supply power to VDD before VP when power is supplied to this
control board.
(2) Design the product to turn off the power for VDD after VP when power is turned off.
(3) Make sure to turn off the power in case of connecting/disconnecting connectors.
(4) Make sure to use VDD and VP following their specifications.
(5) Make sure to use this control board connecting all of terminals between VP and P-GND.

BD2-3880/3890 User’s Manual
11
6. PARALLEL INTERFACE
6.1 Specifications
Data input method : 8 bit parallel signal (DATA0~7)
Control signals : nACK, BUSY, nSTB, nFAULT, PE, nRESET
6.2 Explanation of Input/Output Signals
DATA0~7 : 8 bit parallel signal (Positive logic)
nSTB : Strobe signal to read 8 bit data (Negative logic)
nRESET : Signal to reset control board (Negative logic)
nACK : 8 bit data request signal. Pulse signal output at the end of the BUSY
signal (Negative logic)
BUSY : Signal to indicate BUSY state of the printer. Input new data for “LOW”
(Positive logic)
nFAULT : Signal which is made “LOW”when printer is in alarm state.
(Negative logic)
In this case all the control logics within the printer stop functioning.
PE : Signal which is output when paper runs out. (Positive logic)

BD2-3880/3890 User’s Manual
12
[Printer side] [Host side]
[Printer side] [Host side]
* First “n”of signal name indicates “L”active signal.
6.3 Electrical Characteristics
(1) Input Signal Level
“HIGH”level : 0.7 VDD MIN
“LOW”level : 0.3 VDD MAX
(2) Output Signal Level
“HIGH”level : VDD - 0.1V MIN
“LOW”level : 0.1V MAX
(3) I/O Conditions
nSTB, nRESET input signals are pulled up by 47 KΩ.
Other input signals are pulled up by 50 KΩ.
VDD
TWIST PAIR WIRE
VDD
TWIST PAIR WIRE
All the output signals are pulled up by 50 KΩ.

BD2-3880/3890 User’s Manual
13
6.4 Timing Chart (Compatibility Mode)
(1) Data Input and Printing Timing
6.5 Data Receiving Control
When BUSY signal is “LOW”, data from the host can be received. When it being “HIGH”, data
cannot be received.
6.6 Buffering
This control board incorporates 2K byte buffer.
Therefore, big data can be buffered in input buffer, and the host side can be released immediately.
T1, T2, T3 : 0.5 µs (MIN)
T4 : 270 ns (MAX)
T5 : 2.3 µs (TYP)
T6 : 500 ms (MIN) *On supplying power
SupplPower
DATA
nSTB
T6
T5
T1
T2
T3
T4
BUSY
nACK
y

BD2-3880/3890 User’s Manual
14
7. SERIAL INTERFACE
7.1 Specifications
(1) Data transfer system : Asynchronous
(2) Baud rates
1200, 2400, 4800, 9600, 19200 bps (Selectable by user)
(3) Configuration of one word
Start bit : 1 bit
Data bit : 8 bits Fixed
Parity bit : Odd/Even or No parity (Selectable by user)
Stop bit : 1 bit or more
(4) Signal polarity
RS-232C
•Mark = Logic “1”(–3V ~ –12V)
•Space = Logic “0”(+3V ~ +12V)
(5) Receiving data (RD signal)
RS-232C
•Mark = 1
•Space = 0
(6) Receiving control (DTR signal)
RS-232C
•Mark : Data transfer is not available
•Space : Data transfer is available
(7) Transmission control (TD signal)
DC1 code (11H) X-ON : Data reception is available
DC3 code (13H) X-OFF : Data reception is not available

BD2-3880/3890 User’s Manual
15
7.2 Explanation of Input/Output Signals
(1) RXD
Serial receiving data signal. On occurrence of framing error, overrun error, or parity error, the
data is printed as “?”.
(2) DTR
When this signal is READY, write data or a command. When they are written in BUSY, overrun
error is occurred and data is ignored. Data can be written into the input buffer even when the
printer is busy printing. A BUSY also occurs when the printer is powered on, in test print, in
Online mode, or being reset.
(3) TXD
If data remaining in the printer’s input buffer is 256 bytes or less, the printer transfers a DC3
(13H: Data Receive Not Ready) signal to the host. If data in the input buffer exceeds 256 bytes,
the printer transfers a DC1 (11H: Data Receive Ready) signal to the host.
(4) GND
Common GND on the circuit.
7.3 Error Detection
Parity, framing, and overrun are detected. On detection of any error, the data are stored in the
buffer as “?”.
(1) Framing Error
With “space”state having been detected on detection of a stop bit, error takes place.
The data are stored in the buffer as “?”.
(2) Parity Error
With an error having been detected under specifying parity check, the data is stored in the buffer
as “?”.
(3) Overrun Error
On detection of an overrun error, the data are stored in the buffer as “?”.

BD2-3880/3890 User’s Manual
16
7.4 Data Receiving Control
When DTR/DSR control is selected, data from the host is received with DTR signal at “space”
but not received with DTR signal at “Mark”. When XON/XOFF control is selected, data from
the host is received after sending XON but cannot be received after sending XOFF.
7.5 Buffering
Data transfer to the input buffer include DTR signals and TD signals as the control signals
concerned.
(1) DTR signals [See 7.2 (2)]
(2) TXD signals [See 7.2 (3)]
7.6 Electrical Characteristics
(1) RS-232C Circuit
Input (RXD, DSR)
<Printer side> <Host side>
Output (DTR, TXD)
<Printer side> <Host side>
E
q
uivalent MAX232
E
q
uivalent MAX232