Radio Shack 26-3801 Manuale utente

Radio /haeti

Service

MODEL 100

MICROCOMPUTER

26-3801

PRELIMINARY

PRODUCT

INFORMATION

•-

0220 TECHNICAL SUPPORT SERVICES

MODEL-100

SERVICE MANUAL

#0220 TECHNICAL SUPPORT

DOCUMENTATION LIBRARY

TABLE OF CONTENTS

SECTION

NUMBER

IINTRODUCTION

SYSTEM OVER VIEW

1. Specification

2. Switches and Connecters

3. Key Layout

4. LCD character Font

II DISASSEMBLY/REASSEMBLY

1. Disassembly

2. Reassembly

III MAIN P.W. BOARD TECHNICAL DESCRIPTION

1. LSIs

2. Memory

3. Address Decoding and Bank Description

4. Memory Map

5. I/O Map and I/O Port Description

6. Keyboard

7. cassette Interface Circuit

8. Printer Interface Circiut

9Bar Code Reader Interface Circuit

10. Buzzwe Control Circuit

11. System Bus

12. LCD Interface Circuit

13. Clock Circuit

14. Serial Interface Circuit

15. Power Supply and Auto Power Off Circuit

16. Reset Circuit

MAIN P.W. BOARD PARTS LIST

IV LCD P.W. BOARD TECHNICAL DESCRIPTION

1. LCD Pannel

2. LCD Contrl Circuit

3. LCD Waveform

LCD P.W. BOARD PARTS LIST

VILLUSTRATION PARTS CATALOG

ILLUSTRATION PARTS LIST

VI TROUBLE SHOOTING

1. Trouble Shooting Guide

2.Chevking Procedure

3. Check List

VII PRINED WIRING BOARD

MAIN P. W. BOARD

LCD P. W. BOARD

CONFIDENTIAL

SECTION 1

INTRODUCTION

System Overview

i. Specifications

(1) Main Components

(a) Keyboard

71 keys (9x8 matrix)

Alphabet keys 2 7

Number keys 10

Picture-control keys 7

Function keys 8

Special symbol keys 8

Mode keys 5

Other special-use keys ...... 6

LCD display

Display Panel ...240 x 64 Full-Dot matrix

1/32 duty

1/6.66 bias

Dot Pitch 0.8x0.8mm

Dot Size 0.73 x0.73 mm

Effective Display Area ...191.2 x50.4 mm

(b)

(c)

(d)

Case

Dimensions .... 300

Material ,... . ABS

Operation Batteries

Batteries ....

(W) x 46.5 (L) x215 (H) mm

Operation time

(e)

.Four alkali-manganese batteries

(AM-3)

.5days (at 4hours/day)

20 days (at 1hour/day)

(note: with I/O disconnected)

Memory Protection Battery (on main PWB)

Battery ....

Protection time

Recharere method

Rechargeable Battery (3-51FT)

About 40 days (8 KB)

About 10 days (32 KB)

Trickle charge by AC adaptor,

or operation batteries

(f) LSIs

CPU ...80C35 (OKi)

Code and pin compatible with 8085

ROM . . .Max. 64 KB (2 Banks of 32 KB)

STANDARD 32 KB

OPTION 32 KB

RAM .. . Max. 32 KB

STANDARD 8KB (four TC5518BF (TOSHIBA))

RAM PACK

incremental 8KB RAM PACK on PWB

CLOCK/CALENDAR .. . yPD 1990AC (NEC)

No leap year/No February 29

(2) I/O Interface

(a) RS-232C

Conforms to EIA standards

Signal . . . TXR (Transmit Data)

RXR (Receive Data)

RTSR (Request To Send)

CTSR (Clear To Send)

DSRR (Data Set Ready)

DTRR (Data Terminal Ready)

Programmable Items

*Data Length ...6, 7or 8bits

*Parity NON, EVEN or ODD

*Stop Bit Length ..1or 2bits

*Baud Rate .... 75, 110, 300, 600, 1200, 2400,4800,

9600, 19200 BPS

Maximum Transmission Distance ... 5m

Driver maximum voltage output

Driver minimum voltage output

Receiver maximum voltage input

Receiver minimum voltage input

±5V

±3.5V

±18V

±3V

(b) Modem/Coupler

Conforms to BEL103 standards

Baud Rate ...300 BPS

Programmable Items

*Date Length ...6,7or 8bits

*Parity NON EVEN or ODD

*Stop bit .... 1or 2bits

Full Duplex Answer mode /Call mode,

switchable

Other Functions .. . Hang Up Function

Auto Dialer Function

Data Rate ...1,500 BPS

(MARK: 2,400 Hz, SPACE: 1,200 Hz)

(d) Printer Interface

Conforms to Centronics Interface standards

Handshake Signal ...STROBE, BUSY, SELECT

(3.) Special functions

(a) Automatic power OFF

When there is no program operation (awaiting command)

for ten minutes, the power is automatically cut off.

If the PPC is started once again, the power switch is to

be switched OFF and then ON, thus releasing the

automatic power OFF condition.

The display will remain the same as before the power was

cut off.

2. Connectors ,Switches and Contrast Volume

(1) Connectors

RS-232C 25 pins (DB-25S)

Printer 26 pins (FRC2-C26-L13-ON)

Modem 8pins (TCS-4490)

Cassette 8pins (TCS-4480)

Bar Code Reader 9pins (A-7224)

System Bus 40 pins (IC Socket)

AC Adaptor s.S<P (Center Minus)

C2) Switches

(a) Power Switch

This is the PPC system power switch.

OKJ IflD OFF ON ED OFF

Power OFF Power ON

Fig. 1

(b) ANS/CALL selector

This switch is used to select the MODEM ANSWER mode or

CALL mode.

ams j(HDioRiq- AWS ED 0RI6-

Call mode Answer mode

Fig. 2

This switch is used to select COUPLER (acoustic coupler

connection) or TELEPHONE (direct connection)

DfR MAcp DIR ED acp

COUPLER (ACOUSTIC TELEPHONE (DIRECT TELEPHONE

COUPLER CONNECTION) LINE CONNECTION)

Fig. 3

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