Epson QX-10 Manuale utente

TECHNICAL MANUAL

TROUBLESHOOTING

EPSON

08290002-0

TECHNICAL

MANUAL

TROUBLESHOOTING

QX~O

This Technical Manual provides technical information on the structure, maintenance, and repairs

the QX-10.

For

the

details

the operation, refer

the Technical Manual

QX-1

0 (Principles

Hardware Oper-

ation).

Major technical modifications, if made

the future, will be notified through Service Bulletins, and the

Technical Manual should be revised accordingly. The.details

the Manual are subject

change

withOl,!t notice.

All the information given in the Manual concerns the QX-1 0

others.

this publication may be reproduced, stored

a retrieval system,

trans-

mitted,

any form or by any means, electronic, mechanical, photocopying, recording

otherwise,

with-

out the prior written permission by

EPSON

CORPORATION.

1983

EPSON CORPORATION

Nagano, Japan

CONTENTS

CHAPTER 1 GENERAL

CHAPTER 2 DiSASSEMBLY

AND

REASSEMBLY

CHAPTER 3

ADJUSTMENT

AND

MAINTENANCE

CHAPTER 4 REPAIRS

CHAPTER 5 TROUBLESHOOTING

CHAPTER

GENERAL

CONTENTS

1.1 Features........................................................................................................... 1-1

1.2

Hardware

Configuration................................................................................ 1-1

1.2.1 General................................................................................................... 1-1

1.2.2 Hardware ............................................................................................... 1-1

1.3

Specifications

..................................................................................................

1-2

1.3.1 External Dimensions and

Weight

.........................................................

1-2

1.3.2 Environmental Conditions ....................................................................

1-2

1.1

Features

The OX-1 0 is an all business computer system.

consists

Z80A-compatible

CPU,

a memory

256

maximum,

two

floppy disk drivers

double-sided, double-density,

5-1/4"

disks, and a

12"

full-graphic

CRT

display

with

a resolution

640

400

dots.

The standard configuration includes a programmable timer, Centronics-compatible

printer

interface,

RS-232C interface, C-MOS RAM backed up

battery, clock and calendar, and separate keyboard.

has five card slots

which

permit installation

optional cards

required.

Optional cards available include character generators

varying fonts, IEEE-488 interface, optical fib-

er interface,

color

CRT

interface, and pulse transformer interface.

1.2

Hardware

configuration

1.2.1 General

The OX-1 0 is composed of three units:

the

main system unit,

the

keyboard unit, and

the

monitor

unit.

The main system unit,

the

heart

the

QX-10

system, includes the main

circuit

board, sub

circuit

board,

power

supply,

two

5-1/4"

floppy

disk

drives developed

Epson, and five slots

permitting

in-

stallation

optional cards.

The keyboard

unit

is connected

the main system

unit

with

a curled cord

through

which

signals may

be transmitted in any direction.

The standard

monitor

unit

is a

12"

high resolution green

monitor

capable

displaying

bit

images.

1.2.2

Hardware

Main system

CPU

Memory

Clock

Speaker

Interfaces

DMA

Interrupt levels

Counter/timer

FDD

Card slots

Monitor

Keyboard

.uPD780AC-1

(Z80A

compatible, 4 MHz)

RAM :

256

(maximum

main board)

VIDEO RAM :

128

(maximum on

CRT

board)

C-MOS RAM : 2

(standard, backed up by battery)

EPROM :

2/4/8

(for

IPL)

C-MOS real-time clock (backed up by battery)

Permanent magnet speaker

Printer interface (Centronics-compatible)

RS-232C communications interface

7 channels

6 channels

5-1/4"

FDD

x 2

320

KB x 2 drives

TPI, double sided & double density

green

monitor

640

400

dots

ASCII, HASCI

1-1

1.3

Specifications

1.3.1 External

Dimensions

and

Weight

(1) External dimensions

Main system unit ca.

Green

monitor

unit ca.

Keyboard

unit

ca.

Optional card

(W)

50S

312

50S

(510)

2S0

(2)

Weight:

approx. 1Skg

1.3.2

Environmental

Conditions

(1) Temperature .................... during operation

storage

(2) Humidity........................... during operation

storage

(3) Resistance

shock ........ during operation

storage

(4) Resistance

vibration.... during operation

storage

MainSY~

(0)

340

224

(H)

103

(mm)

270

(mm)

5°C

40°C

-30°C

70°C

80%

(no condensation)

90%

(no condensation)

: max. 1

1 msec

: max. 5

1 msec

: max.

0.25

5-50

: max. 3

5-50Hz

Greeninitor

unit

Fig 1-1

Hardware

configuration

QX-10

1-2

Q10GMS

Board

,uP0765

(Channel A)

MPD7210

Q10PS

(Channel

board

JLPD8255

Fig

1-2

Block diagram of main component

1-3

U9h8

CRT

FOO

(SO-321 )

Keyboard

RS-232C

Printer

(centronics type)

Open card

(A)

Q10S

SYM

board

This is a main control board including

CPU,

compatible

with

Z80A,

Z80A

family

LSI

and main memory.

Name Model Q'ty Function

CPU

.uPD780C 1

CPU

(4MHz) compatible

with

Z80A.

DMA

controller

8237A

2 Provided

with

total

7 channels

for

FDD,

moni-

tor

and options.

Interrupt controller

8259AC

2 Controls

the

interrupt priority

total

levels

interrupt including PWD output keyboard inter-

rupt.

Interval

timer

8253C

2 Controls

the

boud rate

keyboard

clock

and

RS-232C.

Serial controller

7201C

1 Allocates channel a

the

keyboard and B

RS-232C, and controls serial data transfer

with

CPU.

Printer controller

8255AC

1 Provided

with

8-bit

parallel port.

Acts

as an

interface

with

printer

conformable

Centronix.

Real

time clock

46818P

1 Provided

with

clock

and calendar functions.

Floppy

disk

controller

765AC

1 Interface

with

FOO

(SO-321 )

I/O selector

LS154

1 Accesses each

I/O

point

by decoding the

4-bit

low

order address (A2

,...

A5)

CPU.

Main memory

416/4164

8 Dynamic RAM is used.

Provided

with

4 banks maximum.

P-ROM

2716/32/

1 StoresIPL programs.

C-MOS RAM

449

1 Protects

the

data on

power

failure. (Backed up by

an NiCd battery.)

Table 1-1 Primary configuration

0 SYM

1-4

Fig.

1-3

1 ,uPD780C

(Z80A

compatible

CPU)

8237

A (Programmable

DMA

Controller)

8259AC

(Programmable Interrupt Controller)

8253C

(Programmable Interval Timer)

5 7201 C(Multi-protcol Serial Controller)

8255AC

(Programmable peripheral Interface)

46818P

(Real-time clock plus RAM)

765AC

(Programmable Floppy Disk Controller)

(I/O Selector)

416/4164

(D-RAM)

2716/32/04

(P-ROM

for

IPL)

449

(C-MOS RAM)

1-5

(B)

Q10

GMS

board

includes

graphic

display

controller

The board includes graphic display controller ,uPD7220 and V-RAM, and controls display

the green

monitor.

Name

Graphic display

controller

Video RAM

Character generator

Model Q'ty Function

7220

1 A display controller

with

high speed

drawing

and

magnifying functions.

416/4164

Dynamic RAM is used.

2732/64

ROM

storing display

fonts

be sent

the

dis-

play unit.

Table

1-2

Primary configuration

0 GMS

Fig.

1-4

7220

(Graphic Display Controller)

2 V-RAM

(16/64

bit

dynamic RAM)

3 P-ROM (Character Generator)

1-6

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