ACT apricot User manual

apricot
Service
Manual

apricot
Service Manual

I~
PREFACE
This service manual contains all the information
required for the after-sales service
that is required to
maintain the high quality and reliability of the ACT
APRICOT executive micro-computer.
It is assumed throughout this manual that all service
personnel involved
in the maintenance of the ACT
APRICOT already have an in-depth knowledge of digital
electronics,
with particular emphasis on micro-computer
techniques.
This manual contains information relevant to the
total APRICOT range. Illustrations and photographs used
are of
the twin floppy drive version. Please refer to relevant
sections for variations.
ACT (International) Ltd. wishes to acknowledge the
co-operation of
the following companies for giving their
permission
in allowing the reproduction of their proprietry
information:
SONY (UK) LTD.
National Panasonic (UK) Ltd.
Texas Instruments Ltd.
QED (Product Design) Ltd.
The information in this manual is subject to change
without notice and does not represent a commitment on
the part of ACT. The software description in this manual is
furnished under a license agreement.
The software may be
used or copied only in accordance
with the terms of the
agreement. It is against the law to copy any disk supplied
for any purpose other
than the purchaser's personal use.
© Applied ComputerTechniques PLC 1983.

I CONTENTS
Chapter
1 General description
2
3
4
5
6
7
8
9
10
11
Specification
Installation
Safety precautions
Recommended tools and
equipment
Assembly and disassembly
Electrical system
Electronic system
Memory
map
Set-up procedures
Trouble-shooting
Diagnosticprograms
Expansion Boards
Winchester
Appendix
A Monitor
B
Disk drive
C Parts list
D PSU
E Circuitdiagrams, wiring diagrams
Index

r>
INDEX
Assembly and Features
1.2
Disassembly 5.1
Fuses 3.2
AC Sub Assembly
6.3
Floppy Disk Controller
7.13
Async Cable Installation
2.1
Connection 6.19
Interconnection
Block Diagram Apricot 7.22 Diagram 6.2
Conversion 240V
-115V 6.4
I/O Section
7.11
Connectors Pin-Outs 6.6
I/O Port Address 7.20
Circuit Diagrams E1
I/C Catalogue 7.23
Disassembly Modem Cable
Rear Panel 5.3 Connection
6.19
AC Sub Assembly 5.4 Memory 7.6
Motherboard 5.5 MemoryMap 7.38
Chassis Bridge Monitor
A.1
Assembly 5.6
Mnemonics 7.34
Disk Drives 5.7 Parts Description
1.5
Front Bezel and Door 5.8
Main Chassis 5.9 Printer Cable
Power Supply 5.9 Parallel 6.20
Handle 5.9 Serial
6.21
Speaker 5.9 Processor Structure
7.7
Monitor 5.10 Parallel Interface
7.14
Keyboard
5.11
Parts List C.1
5.12 Power Supply
E.1
5.13 Recommended Tools
4.1
Diagnostic Recommended
Boot Prom Equipment
4.1
Documentation
Error Codes 9.1
Specification 1.4
Programs 9.5 Safety Precautions
3.1
Disk Drive B.1
System Outline 7.3
Electrical System 6.1
Sound Generator 7.11
Serial Interface 7.18
Earthing
6.5
Set-Up Procedure 8.1
Expansion Information 6.16
Electronic System
7.1
Timer 7.16

&.....-1· __..G_E_N_E_RA_L_D_E_SC_RIPT __ I_O_N_---..II [2J
I Features
II ,Specifications
III Individual units

GENERAL DESCRIPTION rn
I FEATURES
Processor architecture
8086 running at 5mHz
8089 I/O processor
8087 Optional Maths co-processor
Memory
256 Kbytes expandable to 768 Kbytes
Mass storage
One or two 3.5" Sony mirco-floppy disk drives-
315 Kbytes each
or
One or two 3.5" Sony double sided micro-floppy disk
drives-360 Kbytes each side
Display
I/O
9" green P39 phosphor with antiglare filter
80 characters x 25 lines
Resolution: 800 x 400 pixels
1 x RS232
(V-24) serial port
1 x 8-bit Centronics parallel printer port
Optional on-board modem with auto-dial
2 x expansion slots
1 x "Mouse"
port
Keyboard
Soft QWERTY keyboard with 8 fixed function keys
and 6
touch sensitive keys labelled by LCD Micro-
Screen (tm).
Built-in 4 function calculator.
Time/Date display with battery back-up.
Safety/radiation standards
Meets UL
VDE
BS415
CSA
FCC-B

11';;l1f'1 GENERAL DESCRIPTION
II SPECIFICATION
Physical dimensions
Systems box: 16.5" (43.5cm) wide x 4" (10.6cm) nigh
x 12.5" (33cm) deep
Monitor: 10.5" (27.7cm) wide x
B.5" (22.5cm)
high x
10" (26.4cm) deep
Keyboard:
16" (42cm) wide x 2" (5.3cm) high x
7" (lB.5cm) deep
Weight
Systems box: 14.21bs (6.5 kg)
Monitor: 9.11bs (4.1 kg)
Keyboard: 3.31bs (1.5 kg)
Power requirements
200 to 240 VAC 47 to 63 Hz
or
100 to 125 VAC 47 to 63 Hz
Power consumption
100Wat 115V or 230V input
Temperature range
Operating: 5 to 37°C
Storage: -20 to 60°C
Humidity
Operating: 20 to BO% RH @ 29°C non-condensing

G£NEFALD£SCroVf\ON ill
III INDIVIDUAL UNrf
S
1
1. Monitor
2. SystemUnit
3. Keyboard
4. Microscreen tm
5. Touch Sensitive Keys
S 6. FixedFunction Keys
7. Door
8. Brightness control
2
~~II~I.illll~~~'{I9' Video Cable
" 10. KeyboardCable
11. Keyboard connector
12. Centronics connector
13. Serial connector
14. Video connector
15. Mouse port
16. Mains Switch
17. Fuse
18. Mains Input
16
18
17

1:11 GENERAL DESCRIPTION
SYSTEMS UNIT External
1. Systems Base
2. Systems Cover
3. Rear Panel
4. Facia Bezel
5. Door
6. Expansion Plates
7. Handle
8. Base Clip
9. Base Button
2 10. Keyboard Cable Clips

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lt
Bx
ter1l
:li
1
1. Monitor Bezc\
2. Monitor Base
3, Moni.tor CO'J
cr
4. Peuesta\

I;,:;!)! GENERAL DESCRIPTION
KEYBOARD External
1. Keyboard Bezel
2. Keyboard Base
3. Battery Cover
4. Contrast Wheel
5. Reset Button
6. Reset Plate
5
4~~
6

GENERAL DESCRIPTION rn
SYSTEMS UNIT Internal
1. Disk Drive
2. Power Supply
3. Motherboard
4. AC Sub-Assembly
5. Main Chassis
6. Chassis Bridge
7. Expansion Slots
8. Loudspeaker

Fil
L18
GENERAL DESCRIPTION
MONITOR UNIT Internal
1. Wire Frame Monitor
2. Top Screen
3. Bottom Screen
4. LH Monitor Bracket
5. RH Monitor Bracket
6. Video Cable
7. Brightness Control
8. Sunflex Screen
8

GENERAL DESCRIPTION rn
KEYBOARD UNIT Internal .
1. Keyboard Assembly
2. Keyboard Cable
3. Battery Connector
4. Battery
5. Reset Switch
6. Brightness Control
7. LCD Microscreen

I __ IN_ST_~_L_L_AT_I_O_N ________ I~

INSTALLATION rn
Each computer is carefully adjusted and strictly
inspected before
it leaves the factory.
Correct
installation is extremely important to
maintain the high degree of reliability and performance
in-built
in the machine.
Note the following recommendations:
1. Ensure the line voltage is within the voltage marked
on the outside of the systems unit.
2. To maintain data integrity, the computer should be
operated
in an electrical environment not subject to
large voltage
transients on the line. A normal office
supply is perfectly adequate. Avoid close
proximity
with heavy industrial machinery such as presses, arc
welders, etc.
3. Ensure the operating temperature is not exceeded, and
that the temperature of the machine is allowed to
stabilise (for approximately 30 mins.) if it is moved
from
one extreme to another.
4. Do not obstruct any of the ventilation grills.
5. Under no circumstances must any liquid be allowed to
enter any of the units.
6. Operating the machine in an abnormally dusty
atmosphere will substantially reduce the life of the
disk drive and the media.
7. The plastic case of the machine can be cleaned with a
damp cloth. Under no circumstances use an abrasive
cleanser
or solvent.
8. Although the Sony micro floppy disks are extremely
robust, a few precautions will ensure a long and
trouble-free life:
(i) Keep auto shutter closed at all times.
(ii) Never touch the oxide surface.
(iii)
Do not exceed their temperature range
(IO°C to 60°C).
(iv) Do not expose the disks to any magnetic field.
(v) Do not attempt to clean the disk surface. This
may result in damage to the disk drive heads.

1o.o..ooo.·•••• ··_.····.·S_A_F_ET_Y_P_RE_C_A_U_T_IO_N_S __ ---aI~
I General Safety Precautions
II Fuses
ill Power Supply

SAFETY PRECAUTIONS W
I GENERAL SAFETY PRECAUTIONS
1. The ACT Apricot has been designed to meet all
international safety standards
in~luding UL, VDE,
BS41S, CSA and FCC-.B radiation standards.
2. It is recommended that installation of any expansion
boards or modifications, be carried
out by an
authorised
dealer-the end user shouldnot dismantle
the units.
3. Replacement parts should be of the type and rating
specified by
the manufacturer, to prevent the risk of
shock or
fire.
Refer to appendix A for important safety
precautions
on the monitor.
4. All earth connections should be maintained to the
original specification, refer to Chapter 6.