Epson LQ-570+ Servis Kılavuzu - Sayfa 22

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REV.-A

Table 2-5 lists the functions of the main components and circuits of the printer. The CPU converts the

print data sent from the host mmputer to image data (the print image). The image data is then loaded

to RAM. Each line of data is processed sequentially. The CPU transfera the print data to the printhead

drive circuit. The CPU sends the printhead drive pulse to the printhead drive circuit. The length of this

pulse corresponds to the printhead drive voltage. The head drive circuit then outputs the head drive

signal.

G/A E05A86

Location

E05A50

Print Data

Image Data

Transfer

Date Latch and

Delay control

Figure 2-18. Data Flow

Table 2-5. Functions of the Main IC and Circuits

Receives data from the host computer and loads the data to the input buffer in

RAM (under interrupt processing control). Expands the input data held in the

buffer to create image data. Loads this image data to the image buffer in RAM.

Transfers the image data to the printhead drive circuit. It also controls various

This is a gate array consisting of three components mnfigurd on a single chip:

Memory Management Unit

Handles CPU memory in ROM, RAM, and mask ROM, and assigns addresses

for other devices.

Parallel Interface (Parallel I/F)

Holds the parallel interface functions.

Reset Circuit

Contains the circuit that generates the /RESET signal.

2-14

RAM

Input

Buffer

- - - - - -

Image

Buffer

Functions