ACT apricot User manual

apricot
Service
Manual

apricot
Service Manual

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 Computer Techniques PLC 1983.

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

I 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 Memory Map 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_----.l10
I Features
IT .Specifications
ill 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
1/0
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

1~;~l~1rll GENERAL DESCRIPTION
II SPECIFICATION
Physical dimensions
Systems box: 16.5" (43.Scm) wide x 4" (10.6cm) high
x 12.5" (33cm) deep
Monitor: 10.5" (27.7cm) wide x 8.5" (22.Scm)
high x 10" (26.4cm) deep
Keyboard: 16" (42cm)
wide x 2" (S.3cm) high x
7" (18.Scm) 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 11SV or 230V input
Temperature range
Operating: 5 to 37°C
Storage: -20 to 60°C
Humidity
Operating: 20 to 80% RH @ 29°C non-condensing

G£N£FAL D£SCR{P'1'ION m
Ul INDl\TlD
tJAL
tJNffS 1. Monitor
2. systemUnit
3. Reyboard
4. Microscreen un
\ s. TouchSensitiveReys
\I 6. fiJ{edfunctionReys
7. Door
8. Bri~btness control
2
~~ii~iiilll;I~~'9' Video Cable
~ \0. Reyboard Cable
11. ReyboarO connector
12. Centronics connector
13. Serial connector
14. Video connector
6
15. Mouse port
16. Mains switcb
17. Fuse
18. MainslnpUt
16
18
."rr-- -17
9

I~:~}I 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
3
~4
8

G£N£W\.L D£SCWYf\ON ill
~O~rroR £,)ttern
a1
1. Monitor Bezel
2. Monitor Base
3. Monitor Covcr
4. PcJcst~\
1

I'fz!~/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
SYSTEMS UNIT Internal
1. Disk Drive
2. Power Supply
3. ~otherboard
4. AC Sub-Assembly
5. ~ain Chassis
6. Chassis Bridge
7. Expansion Slots
8. Loudspeaker

li:J'wl 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

,--- .•. IN_SL_~_L_L_AT_I_O_N ____ ----,I ~

INSTALLATION W
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 linevoltage 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 operatingtemperature 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 ventilationgrills.
5.
6.
Under no circumstances must any liquid be allowed to
enter any of
the units.
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 magneticfield.
(v) Do not attempt to clean the disksurface. This
may result in damage to the disk drive heads.

~S_AF_E_T_Y_P_RE_C_A_U_T_IO_N_S __ ----II~
I General Safety Precautions
II Fuses
ill Power Supply

SAFETY PRECAUTIONS rn
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 should not dismantle
the units.
3. Replacement parts should be of the type and rating
specified
by the manufacturer, to prevent the risk of
shock orfire.
Refer to appendix Afor
important safety
precautions
on the monitor.
4. All earth connections should be maintained to the
original specification, refer to Chapter 6.

rx":"~\;1 SAFETY PRECAUTIONS
n FUSES
1. There are three fuses within the whole computer. 2 in
the system unit and 1 in the monitor.
WARNING- REMOVE POWER CABLE BEFORE
SERVICING
2. System Unit:
.
The main system fuse is readily accessible on the rear
panel.
The carrier is of the screw-in type, andrequires
a flat bladed screwdriver to remove.
Type-
20mm slow blow
240V-T2 Amp-Part Number 11002121
115V-T3 Amp-Part Number 11002721
3. Power Supply:
The power supply is protected by its ownfuse within
the power supply casing. Since the power supply will
automatically
shut down in the case of an external
fault,
the failure of this fuse indicates a fault within
the unit itself. Under no circumstances replace this
fuse,
but change the unit as an assembly-see overleaf
for safety precautions concerning this assembly.
4. Monitor:
The monitor is powered from the + 12V rail off the
systems unit power supply. This rail is protected by a
fuse
within the monitor itself. It is located on the
p.e.B. under the High Voltage Block component.
Type-1~" x 2 Amp-Part Number 11040021