2.THEORY OF OPERATION

2.1Electrical Operation

The electrical operation of the printer circuit is described in this section.

2.1.1Summary

Fig. 2-1 shows the block diagram of the printer.

The control board is made up of the microprocessors, peripheral circuits, drive circuits, sensors and interface connectors.

The power to the control board is supplied by the power board through the connector cord.

The power to other electrical parts is also distributed through the connectors within the control board.

2.1.2Microprocessor and the peripheral circuit

(1)Microprocessor (Q7: 67X640)

This processor is a CMOS single-chip computer with integrated peripheral device functions and a 16 bit MPU core, all OKI original architecture.

The processor has a 20 bit address bus and a 16 bit data bus.

It is capable of accessing up to 1M word program memory and 1M bytes of data memory. The following characteristics are also provided:

•Built-in type data memory of 512 bytes

•8-bit 4-channel A/D converter × 1

•16-bit automatic reload timer × 2

•8-bit serial port × 2

•8-bit parallel port × 3 (bitwise I/O specification available)

And others.

The function of this microprocessor is to provide a central mechanism for the entire printer by executing the control program through the LSI and driver circuits.

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Oki 3391, Microline Printer, 3390 specifications Theory of Operation, Electrical Operation
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3390, Microline Printer, 3391 specifications

The Oki 3391 Microline Printer embodies precision and versatility, making it an essential tool for various business applications. Built with a range of powerful features, this dot matrix printer excels in environments that require consistent, reliable printing. The Oki 3391 is a member of the Oki 3390 series, renowned for its robust design and technological advancements.

One of the standout characteristics of the Oki 3391 is its impressive printing speed. The printer operates at a rate of up to 550 characters per second, significantly boosting productivity in busy office settings. This speed allows users to handle high-volume print jobs efficiently, ensuring deadlines are consistently met. Additionally, the Oki 3391 offers page mode printing, which is ideal for multi-part forms, making it a popular choice for invoicing and record-keeping applications.

The Oki 3391 utilizes advanced print head technology, featuring a 24-pin mechanism that delivers high-quality text and graphics. This ensures that printed documents have clear, sharp details while maintaining a professional appearance. The printer supports various paper types and media sizes, from plain paper to labels and envelopes, enhancing its flexibility to meet diverse printing needs.

In terms of connectivity, the Oki 3391 is equipped with multiple interface options, including parallel and USB connections, facilitating easy integration into existing office setups. This versatility enables users to connect the printer to various devices, such as PCs and terminals, without hassle. Furthermore, the printer offers a range of emulations, ensuring compatibility with different software applications.

Durability and reliability are fundamental qualities of the Oki 3391. Designed to withstand high usage, it features robust components and is built for long-term operation, minimizing downtime. Its energy efficiency also aligns with modern environmental standards, making it a responsible choice for businesses looking to reduce their carbon footprint.

Overall, the Oki 3391 Microline Printer, part of the 3390 series, stands out for its speed, print quality, and durability. Its ability to handle various printing tasks while providing consistent performance makes it an invaluable asset for businesses that value efficiency and reliability in their document processing. Whether printing multi-part forms or daily reports, the Oki 3391 delivers exceptional results, making it a top contender in the dot matrix printer market.
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