Epson DLQ-3000 (upgrade model) Service Manual(1).pdf

EPSONIMPACTDOT PRINTER

DLQ-3000

(upgrade model)

SERVICE MANUAL

EPSON

4006094

PREFACE

This document provides supplementary information to describe the new DLQ-3000 (Minerva+), which is a

follow-on version of the DLQ-3000 (Minerva). Therefore, you must refer to this information in conjunction with

DLQ-3000 (Minerva) Service Manual for details on any subjects common to both printers.

-i-

REVISION SHEET

Revision

Issue Date

Revision Page

March 15, 1996

1st issue

-ii-

DLQ-3000(MINERVA+)

ProductDescription

1.1 FEATURES

Minerva+ is a 24-pin serial dot-matrix and flat-bed type impact printer. As this printer follows on DLQ-3000

(MINERVA+), the main future is almost same as DLQ-3000 (MINERVA).

The main features are ;

o Two built-in and one optional I/F

Bi-Directional Parallel Interface (IEEE-1284 nibble mode)

Serial Interface

Type-B Interface (Option)

The exterior view of DLQ-3000 (MINERVA+) is the same as DLQ-3000 (MINERVA).

Rev.A

1-1

Product Description

DLQ-3000(MINERVA+)

1.2 INTERFACE OVERVIEW

The printer provides an 8-bit Bi-directional parallel interface and serial interface as standard. Moreover, it is

possible to interface to various computers using the optional type-B interface board. This section describes

the specifications of the standard interfaces.

1.2.1 Parallel Interface Specifications

1.2.1.1 Forward Channel

Transmission mode:

8-bit parallel, IEEE-1284 compatible mode

Synchronization:

By STROBE pulse

Handshaking:

By BUSY and ACKNLG signal

Signal level:

TTL-compatible level, IEEE-1284 level 1 device

Adaptable connector:

57-30360 (Amphenol) or equivalent

Data transmission timing:

See Figure 1-1.

Note:

Transitiontime (rise time andfall time) of every input signalmust be less than 200ns and

everyoutput signalmustbelessthan120 ns.

The BUSY signal is at a HIGH level before either -ERROR signal is at a LOW level or the PE signal is at a

HIGH level until all these signals return to their inactive state. The BUSY signal is at a HIGH level in the

following cases:

- During data reception (see the figure above)

- When the input buffer is full

- When the INIT input signal is active

- During initialization

- When the ERROR signal is active

- In the self-test mode

- In the SelecType

- When the parallel interface is not selected.

The ERROR signal is at a LOW level when the printer is in one of the following conditions:

- Printer hardware error (fatal error)

- A paper-out error

- Release lever operation error

PE signal is at a HIGH level during paper out error.

DATA

DATA (n)

DATA (n+1)

-STORBE

500 ns (min.)

500 ns (min.) 500 ns (min.)

0 (min.)

BUSY

-ACKNLG

0 (min.) 500 ns (max.)

0 (min.)

500 ns ~10 µs

Figure 1-1. Data Transmission Timing

1-2

Rev.A

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