OKI ML5721eco Monochrome Dot Matrix Printer with 9 Pin, 700 char/sec Speed, Parallel and USB Connectivity

Oki (5031713046158 / 01268501) - AC input voltage: 220 - 240 V - Buffer size: 128 KB - Maximum number of copies: 6 copies - Maximum print speed: 700 cps - Noise Level: 57 dB - Noise level quiet mode: 55 dB | OKI ML5721 ECO

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OKI ML5721eco Monochrome Dot Matrix Printer

Overview

The OKI ML5721eco is a high‑performance, monochrome dot matrix printer designed for demanding business environments that require reliable, continuous printing of invoices, receipts, and multi‑part forms. With its 9‑pin print head, the machine delivers crisp text and clear barcodes at speeds up to 700 characters per second (cps), making it ideal for high‑volume operations.

Print Technology & Quality

The printer uses a dot matrix printing mechanism with a 9‑pin head, capable of producing a maximum resolution of 240 x 216 DPI. This resolution ensures sharp alphanumeric output and accurate barcode reproduction. The machine supports a wide range of character pitches—5, 6, 7.5, 8.5, 10, 12, 15, 17.1, and 20 cpi—allowing users to choose the optimal density for their documents.

Supported Text Styles

  • Double Height
  • Double Width
  • Emphasized
  • Enhanced
  • Italics
  • Overscore
  • Subscript
  • Superscript
  • Underline

Built‑in Barcode Support

The ML5721eco can print a variety of barcodes directly, including:

  • CODABAR (NW-7)
  • EAN13
  • EAN8
  • Industrial 2/5
  • Interleaved 2/5
  • Matrix 2/5
  • POSTNET
  • UPC‑E

Performance & Capacity

The printer’s maximum print speed is 700 cps, with a draft mode of 600 cps and a low‑quality (LQ) mode of 113 cps. It can produce up to 6 copies per job, making it suitable for multi‑part forms.

Print Head Life & Reliability

  • Print head life: 400 million characters
  • Mean Time Between Failures (MTBF): 25,000 hours

Paper Handling & Media Compatibility

The ML5721eco supports continuous paper widths ranging from 76.2 mm to 406.4 mm and lengths from 76.2 mm to 558.8 mm. It can feed paper manually, via pull tractor, or push tractor mechanisms.

Supported Media Types

  • Card stock
  • Envelopes
  • Labels
  • Plain paper

Connectivity & Interfaces

The printer offers robust wired connectivity options:

  • Standard interfaces: Parallel, USB 2.0
  • Optional connectivity: Ethernet, Serial (RS‑232)

Operating System Compatibility

Compatible with a wide range of Windows operating systems, including:

  • Windows 2000 / XP (32‑bit & 64‑bit)
  • Vista (32‑bit & 64‑bit)
  • 7 (32‑bit & 64‑bit)
  • Server 2003 (32‑bit & 64‑bit)
  • Server 2008 (32‑bit & 64‑bit)
  • Server 2008 R2 (64‑bit)

Electrical Specifications

  • AC input voltage: 220 – 240 V
  • Power consumption (typical): 52 W
  • Noise level: 57 dB (quiet mode: 55 dB)

Physical Dimensions & Weight

  • Dimensions (WxDxH): 592 mm × 375 mm × 191 mm
  • Weight: 10 kg

Memory & Buffering

The ML5721eco features a 128 KB buffer size, ensuring smooth data handling and minimal print interruptions even during high‑volume tasks.

Key Takeaways

  • High speed: 700 cps with robust draft and LQ modes.
  • Durable print head: 400 million characters lifespan.
  • Versatile media handling: Supports a wide range of paper types and sizes.
  • Comprehensive connectivity: Parallel, USB, optional Ethernet & RS‑232.
  • Reliable operation: MTBF of 25,000 hours and extensive OS support.

The OKI ML5721eco Monochrome Dot Matrix Printer stands out as a dependable solution for businesses that demand high‑volume, high‑quality printing across diverse media types while maintaining low operational noise and power consumption. Its blend of speed, durability, and connectivity makes it an excellent choice for accounting departments, logistics centers, and any environment where continuous, accurate printing is essential.


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Tags OKI ML5721 ECO Pin dot matrix
Identifiers
Brand Oki

Oki is a Japanese brand that produces printers, copiers, and fax machines. The company has a wide range of products for both personal and business use, and its printers are known for their quality and reliability. Oki also offers a number of software applications for managing and printing documents.
Model Oki 01268501
MPN Oki 01268501
ID 4492702
Dimensions / Weight
Key Features
AC input voltage
The alternating current voltage range that the product accepts from its power source, expressed in volts (V). It indicates the minimum and maximum supply voltages compatible with the device.
220 - 240 V
Buffer size
The amount of data that a device can temporarily store in its internal memory before processing or transferring it. The value is expressed with a digital capacity unit (e.g., kilobytes, megabytes). This attribute helps understand the performance and efficiency of hardware when handling information streams.
128 KB
Built-in barcodes CODABAR (NW-7),EAN13,EAN8,Industrial 2/5,Interleaved 2/5,Matrix 2/5,POSTNET,UPC-E
Colour
The colour or combination of colours that a product is available in, expressed as common names such as "Black", "Silver" or comma‑separated lists like "Black, White". It indicates the visual appearance of the item for consumers.
No
Connectivity technology
The network and data interface technologies supported by the product, such as Wired, Wireless, USB, Bluetooth, or combinations thereof. Each value represents a distinct technology that can be used for communication or power delivery.
Wired
Maximum number of copies
The total count of individual copies that a product can produce, print, or otherwise deliver in a single operation or session. It represents the maximum number of identical units that the device is capable of handling at once, such as the number of pages a printer can copy before needing to pause or reload. The value is an integer and may be accompanied by the word "copies" for clarity.
6 copies
Maximum print speed
The highest number of characters a printer can output per second, expressed in characters per second (cps). This metric indicates the maximum throughput of the printing device and allows users to compare how quickly different printers can produce text or simple graphics.
700 cps
Maximum resolution
The maximum pixel dimensions of a display or image, expressed as width by height (e.g., 1920x1080). It indicates the highest resolution that a device can output or support and is commonly used for monitors, TVs, smartphones, cameras, and digital images.
240 x 216 DPI
Mean time between failures 25000 h
Noise Level 57 dB
Noise level quiet mode
The sound intensity produced by a product while operating in its quiet or low‑noise mode, expressed in decibels (dB). This value helps users assess how quietly the device runs during normal use and compare models for noise‑sensitive environments.
55 dB
Optional connectivity
A comma‑separated list of the network or data interface technologies that a product supports, such as Ethernet, Wireless LAN (Wi‑Fi), Serial (RS‑232/RS‑422), Parallel, Bluetooth, USB 2.0, NFC, Fiber, etc. The value may contain one or more interface names separated by commas.
Ethernet,Serial (RS-232)
Paper feed
A list of the paper feeding mechanisms that a device can handle, such as push‑tractor, pull‑tractor, or combinations thereof. Each entry describes a distinct way the printer or copier feeds paper from its input tray(s) to the printing mechanism.
Manual,Pull tractor,Push tractor
Paper tray media types
A list of the paper or media types that a printer’s input trays can accept, such as envelopes, labels, plain paper, recycled paper, and transparencies. The values are free‑text strings separated by commas, allowing users to see which materials are compatible with the device.
Card stock,Envelopes,Labels,Plain paper
Power consumption 52 W
Print head
The count of electrical contacts or pins in the printer’s print head assembly, indicating how many separate signal lines are used to drive the printing mechanism. This number is relevant for dot‑matrix, impact, and some inkjet printers where the pin count determines print resolution, speed, and compatibility with specific ribbon or cartridge types.
9-pin
Print head life
The total number of characters a printer’s print head can produce before it needs replacement or maintenance, expressed as a numeric value that may include qualifiers such as "million". This metric indicates the expected longevity and durability of the print head for continuous printing operations.
400 million characters
Print technology
The type of printing process or technology used by the product, such as laser, inkjet, thermal, LED, or other specialized methods.
Dot Matrix
Standard interfaces
A list of the physical or logical interfaces that a device can use to connect with other devices, such as USB, Ethernet, Bluetooth, Wi‑Fi, RS‑232, RJ‑45, Parallel, and similar standards.
Parallel,USB 2.0
Weight
The mass of the product expressed in a standard unit such as grams or kilograms. It represents how heavy the item is and can be used for shipping calculations, handling instructions, or consumer information.
10 kg

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