Impact Dot Matrix Printer Mechanisms

Despite the growth in demand for thermal printers, dot impact printers are still most appropriate for many applications and worldwide demand remains strong. Particularly well-suited to plain paper and high-speed printing, they are indispensable for check and validation and other such applications. As in its thermal printer development, Citizen Systems makes the most of its precision equipment technologies in the development of dot impact printers, drawing on its formidable strengths in this area to offer products that satisfy customers’ dot impact printing needs fully and accurately.

Accessories

Control board

CBM-909-4D

(Only for MD-911)

Interface	Parallel and serial
Number of columns	40
Font	4 × 7 (including half dot)
Command set	Unique
Firmware location	Masked CPU
Buffer	1 line
Supporting devices	LF switch, On-line switch
Dimensions	80 × 55.5mm
Source voltage	4.0+0.7/–1.0V
Custom control chip	909PC-4DU

Control chip

Paper winder

909PC-4DU	AW-5
(Only for MD-911)	(not supported by CBM-909)
Ink ribbon
IR-91, IR-91L (Long life)

MD-910 / 911	Paper Roll
MD-910 / 911	mm
	58

■58mm paper width

■5V operation

■2.5 lines/sec printing speed

■Ultra compact design

Specifications

Model	MD-910			MD-911
Printing method	Serial impact dot matrix
Printing direction	One-way printing
Printing speed	Approx. 2.5 lines/sec			Approx. 1.8 lines/sec
Number of columns	24 columns: 144 dots/line			40 columns: 180 dots/line
Font	5 × 7 matrix			4 × 7 matrix
Number of wires	8 pins (4 pins × 2 heads)
Character size (W × H)	Approx. 1.7 × 2.4mm			Approx. 1.1 × 2.4mm
Character pitch	1.98mm (Interval of columns)			1.17mm (Interval of columns)
	3.52mm (Interval of lines)			/ 3.52mm (Interval of lines)
Motor	Voltage: 5.0V DC / Peak current: Approx. 1A / Average current: 0.3A max.
Dot pulse sensor	Photo interrupter
Home pulse sensor	Leaf switch
Printing sensor	Voltage: 5.0	V DC /	Resistance: 1.7 ±0.3Ω (25°C)
Paper feeding solenoid	Voltage: 5.0	V DC	/ Resistance: 9 ±2Ω (25°C)
Connecting method	Copper foil patterns at 2.54mm pitch.
Driving voltage	3.5 ~ 5.5V DC
Printing paper	57.5 ±0.5mm
Copy	Original print + 1 copy
Ink ribbon	Special ribbon cartridge of black or purple
Paper feeding speed	Approx. 5 lines/sec			Approx. 3.6 lines/sec
External dimensions	90 × 45.5	× 16mm(W × D × H)
Weight	105g ±10%
Operating temperature	0 ~ 50°C
Storage temp. range	–25 ~ 70°C
Reliability	MCBF: 1.5 million lines			MCBF: 1.0 million lines

Type Classification

MD-	910	-	SS	1) Type		2) Knob
				910: 24 columns		SS: No knob
				911:	40 columns	HS: Horizontal knob
1)		2)				VS: Vertical knob