Canon A-200 series User manual

/
(230 V lViodeO
SERVICE
MANUAL
Canon
FEB. 1985 . SY8-0061-751
COPYRIGHT © BY CANON INC . CANON A-200 SERIES FEB . 1985 PRINTED IN JAPAN (lMPRIME AU JAPO/i,

TABLE OF CONTENTS
PART I.
INTRODUCTION.........................................................................................................1
PART
II.
SPECiFiCATIONS......................................................................................................7
PART
III. DISASSEMBLY PROCEDURE............................................................................... 15
PART IV. INSTALLATION.........................................................................................................23
PART
V. ADJUSTMENT.........................................................................................................37
PART
VI. THEORY OF OPERATIONS.................................................................................. 41
PART VII.
DIAGNOSTIC PROGRAMS......................................................:...........................116
PART VIII. TROUBLESHOOTING...........................................................................................130 I
PART
IX. DIAGRAMS AND PARTS LlST...........................................................................144 I
·1
PART
X. APPENDiX.............................................................................................................. ,180
1
1
)

PART I
INTRODUCTION
CONTENTS
1-1. General ................................................................................................................ 3
1-2. Features ............................................................................................................... 3
1-3. Description of the Computer ...........................................................................:..... 4
)
,

1-1. General
In this section, we will give an overview to the Canon A-200 Personal Computer.
Variety of the A-200
The A-200 is classified
in four versions in accordance with the types of display adapter and
numbers
of floppy disk drive. However, there are no single disk drive versions for 230V AC.
• Model M1 ....... 1 disk drive with monochrome board
• Model M2....... 2 disk drives with monochrome board
• Model
Cl ...... 1 disk drive with color board
• Model C2....... 2 disk drives with color board
1-2. Features
• 8086 Microprocessor
The A-200
is equipped with the 8086 microprocessor as CPU (Central Processing Unit) which
has 16-bit data bus.
In other words, the 8086 can access 16-bit data at a time, and so, it can
perform more quick and versatile data processing in comparison with
an ordinary 8-bit
microprocessor.
• Memories
The A-200 has 256K bytes
of RAM (Random Access Memory) as the standard and is expanda-
ble up to 512K
bytes. Also the A-200 is equipped with 16K bytes of system ROM (Read Only
Memory) including a diagnostic program
etc. and 4K bytes (Model M1 and Model M2) or 32K
bytes (Model C1 and Model C2) of video RAM which stores the data to be displayed on the screen.
• Built-in Interfaces
In order to input or output data to/from the A-200, it has useful devices such as 5-1/4" floppy
disk drive (Model
M1 and C1 has one disk drive and Model M2 and Model C2 has two drives),
RS-232C interface and printer interface.
• Expandability
In addition to the standard features listed above, a customer can expand the functions of the
A-200 by adding the 8087 Numeric Data Coprocessor or inserting optional board into the inter-
nal five expansion
slots.
• Powerful Operating System
A
DOS (Disk Operating System) is now indispensable to the advanced personal computers like
the
A-200. We are adopted the MS-DOS developed for 8086/8088-based computers by Microsoft
Corp. Through
MS-DOS, an user can communicate with the computer, disk drive, and printer,
managing these resources to his advantage.
• Standard Diagnostic Programs
The A-200 has two different diagnostic programs - one
is the ROM-based built-in program and
the other is the disk-based programs. The ROM-based one
is executed whenever the power
for the computer
is turned on or the RESET button is pushed. The disk-based program is an
accessory of the computer. It checks the computer itself and peripherals.
• Compatible with the
IBM® Personal ComputerTM
Most of the application software, peripherals or options designed for the
IBM® PCTM can be
used with the
A-200.
3

1-3. Description of the Computer
CD Power Switch
To turn the computer on or off. On-position is marked as ''1'' and off-position as "0': When turning
on the
system, turn the power of the peripherals on first then turn the computer's power switch on.
® Floppy Disk Drive(s)
To save or load programs, files or data. There are different two versions in the number of disk
drives: A-200 Model
M1 and C1 have only one drive and Model M2 and Model C2 have two drives.
@ RESET Button
To reset and initialize the computer when it has "hang-up" caused by improper user's program
orsome machine-language programs. Whenever this button
is pressed, the computer will begin
to execute the self diagnostic tests and then re-Ioads the DOS or other system disk to initialize
the system.
@ Keyboard Connection Jack
To connect a coiled cable with a plug from the keyboard unit into this jack.
@ Keyboard
To utilize when entering commands etc.
Figure 1-1
® Cooling Fan
To prevent the computer against excessive heat generated during operation. Do not block this
ventilation when the computer
is installed close to the wall etc.
WAC Power Inlet
To insert AC power cord with jack into this inlet.
4

® AC Power Outlet
To plug a power cord of a peripherals unit etc. into this outlet. This outlet is controlled by the
power switch
CD. When the power switch is turned on, this outlet is powered, and when the pow-
er switch
is off, this outlet is not powered.
This outlet can handle
AC current in maximum of OAA. Be careful not to exceed this figure when
using this outlet.
® RS-232C Connector
To plug a special cable to this connector when an user needs to communicate with a host com-
puter. another personal computer or serial printer.
@ Printer Connector
To print out data, information or programs, connect a printer cable to this connector.
(jJ) Expansion 1/0 Slots
The Canon A-200 can expand its functions by plugging
in optional expansion cards into these
expansion
slots.
@ Composite Signal Jack
This RCA-type jack has been provided for the color display adapter board only. Connect it to .
a composite signal input terminal on a display monitor.
@ Display Connector
To connect 9-pin plug with cord suitable for this connector to make a connection with the com-
puter and the display monitor unit.
Figure 1-2
(f3l Pocket
This pocket
is provided for the Model M1 and Model C1. Keep unused disks in it.
Figure 1-3
5

PART II
SPECI FICATIONS
CONTENTS
11-1. Product Outline .................................................................................................. 9
11-1-1. System Configuration ............................................................................. 9
11-2. Specifications .................................................................................................... 9
11-2-1 . General.................................................................................................. 9
11-2-2. Monochrome Display Adapter Board ...................................................... 10
11-2-3. Color Display Adapter Board .................................................................. 10
11-2-4. Floppy Disk Drive MDD-211 ................................................................... 11
11-2-5. Keyboard Unit ........................................................................................ 12
7

11-1. Product Outline
11-1-1. System Configuration
Software
os: MS-DOS version 2.11 (Compatible with PC-DOS)
Language:
GW-BASIC version 2.01
11-2. Specifications
11-2-1. General
Item Specifications
1-1-----450-----t·1 ....
385
1.----
Size of Main
Unit
Il ~=B I =~II ~II~ ~I
I
III
I 420 I
(Unit: mm)
Size of
Keyboard
Tillilllllllllllllll~
lJ
Weight Approximately
11.5kg
Power Source 230V
AC ± 15 %, 50/60 Hz, approximately 150W
Processor 16-bit processor 8086
CPU Clock 4.77MHz
Interrupt Eight types
Main Memory Capacity
Element
256K bytes (with a parity bit)
MOS
LSI 64K bit D-RAM
f 25
b
\<. e~f'fhC!oN
2-side double-density, standard track, 5-1/4"
Type
(Thin type)
FDD Capacity 360K bytes/drive (Formatted)
Format IBM format
RS-232C type, one port (on the main board)
Serial Interface
110 -9,600 baud ..... programmable
Connector, pin assignment ..... IBM-PC compatible
Centronics type
(on the main board)
Printer Interface Connector, pin assignment ..... IBM-PC compatible
Five slots
8-bitl16-bit data bus slot: Two slots (One
of those used for CRT
1/0 Slot CONT.)
IBM-PC compatible slot: Three slots
9

11-2-2. Monochrome Display Adapter Board
Item Specifications
CRTC
68B45
Video-RAM Capacity 4K bytes
Element MOS
LSI 16K-bit static RAM
Character Capacity 8K bytes
Generator Element C-MOS masked
ROM
80 characters x 25 lines
Characters 9
7 x
x
14 dots per character box
9 dots per character font
Attribute ..... IBM-PC compatible
Video signal 16.257MHz maximum
V-sync
50Hz
H-sync 18.432kHz
11-2-3. Color Display Adapter Board
Item Specifications
CRTC 68B45
Capacity 32K bytes
Video-RAM Element MOS
LSI 64K-bit O-RAM
Capacity 8K bytes
Character
Generator Element C-MOS masked
ROM
80 characters x 25 lines mode
8 x 8 dots per character box
7 x 7 dots per character font
Characters Attribute ..... IBM-PC compatible;
16 colors
40 characters x 25 lines mode
16 x 8 dots per character box
14 x 7 dots per character font
Attribute ..... IBM-PC compatible;
16 colors
640 x 200 dots mode (color disable)
8 pixels per byte
Graphics 320 x 200 dots mode (color graphics)
4 pixels per byte; one pixel can be assigned 4 of
16 colors.
Video signal 14.31818MHz maximum
V-sync
60Hz
H-sync 15.75kHz
10

11-2-4. Floppy Disk Drive MDD-211
Item Specification s
Type 2-side, double-density, standard track, 5-1/4" (Thin type)
Weight 1.2kg
Storage
Total
327.68K bytes (Formatted)
Capacity
Per track 6.25K bytes
Number of
Tracks
80
Number of
Sectors
16
Recording
Density 5876
BPI
Data transfer
Rate
250K bits per second
Between tracks 6 mS
Access Time Seek settling 20
mS
Revolution waiting 100 mS
Error
Rate 10-
12
per bit, 10-
6 per seek
Power
Consumption
+5V, OAA max., +12V, 1.0A max.
11

11-2-5. Keyboard Unit
Item Specifications
Processor 8-bit one-chip microprocessor 8048 (or 8748)
Number of 83
keys
Keys
Weight Approximately 1.6kg
•
Key Layout
USA, ASCII
Figure 2·1
UK
Figure 2-2
12

GERMAN
"EJ
'3
EJ
Figure 2·3
FRENCH
Figure 2·4
13

PART III
DISASSEMBLY
PROCEDURE
CONTENTS
111-1. Disassembly Procedure .................................................................................... 17
111-1-1. Top Cover ............................................................................................ 17
111-1-2. Power Unit ........................................................................................... 17
111-1-3. Main P.C.B. ... .................................................................................... 19 .
111-1-4. Floppy Disk Drive Unit ......................................................................... 20
111-1-5. Keyboard Unit ...................................................................................... 21
15

111-1. Disassembly Procedure
Notes
• Be sure to turn the power switch of the A-200 off and to unplug the AC cord from the outlet.
• Use screw drivers whose tip fits the head
of screws or you may damage the head.
111-1-1. Top Cover
1. Remove four screws from both sides of the top cover.
2. Lift the rear of the top cover and move it backward.
Tabs
Figure 3·1
111-1-2. Power Unit
1. Unplug the AC power cords from the inlet and outlet located on the rear of the computer:
AC outlet
/-
tOol
~
0
~
~
0
10 (::::: :::::) 0110 (:::: :::: :::J 0 I :.
/
AC inlet
Figure 3·2
17