Epson LQ-570+ Manual de serviço - Página 23

Procurar online ou descarregar pdf Manual de serviço para Acessórios para impressoras Epson LQ-570+. Epson LQ-570+ 49 páginas. Sdx acd manager 5.2 printer setup
Também para Epson LQ-570+: Boletim de apoio ao produto (20 páginas), Boletim de apoio ao produto (5 páginas), Manual de informações do produto (8 páginas), Manual de instalação (1 páginas), Manual (12 páginas), Especificações (2 páginas), Manual (8 páginas), Boletim de apoio ao produto (16 páginas), Manual de configuração (14 páginas)

REV.-A

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

Location

PROM

MROM

(Mask ROM)

HEAD GATE

ARRAY

. . .

Vref Circuit

2.3.2 Reset Circuit

Figure 2-19 shows the reset circuit block diagram. The reset circuit issues the /RESET signal. Each

part of the control cimuits is initialized when this /RESET signal is received. The renditions when the

/RESET signal is output are described below.

When Turning on the Power Supply

Immediately after the power has been turned on, PST 529 (IC19) outputs the /PON pulse. E05A50

then outputs the /RESET signal from the /OUT port of IC19. After a certain time has elapsed, the

charge in the condenser builds up again. The M-ILD signal is canceled and then the /RESET signal

is canceled.

Resets performed by the CPU itself (CPU

The CPU outputs the /RESET signal if there is a /RESET request for E05A50 and E05A50 output the

/DISC pulse. "

IOUT

PROM contains the program that runs the CPU.

Holds the CPU working area and the various buffers. (1E is not used for an 80-

column device and is not installed.)

Holds the character design (also called the character generator).

information as the TOF position.

This is a gate array mnsisting of three components configured on a single chip:

Mode 1: HD1+HD2+HD3+......+HD22+HD23+HD24

Mode 2: HD24+HD23+HD22+...... +HD3+HD2+HD1

Delay control(for low noise)

Image data latching

This is a circuit for generating the reference voltage used in the A/D mnvertor

within the CPU.

self-reset)

Figure 2-19. Reset Circuit Block Diagram

2-15

Functions

E05A50(IC11)

107