Sharp MZ-80B User manual

SHARP
SERVICE .MANUAt""
.uu .................................................... ~~~~~M~1
~) PDSM581008·MZ
•
.~
~
()
[FEATURE~
Personal Computer
MZ-80B
Options
MZ·80EU
MZ·80I02
(Expansion Port)
(Universal
I/O Card)
MZ-80GMK (Expansion Graphic RAM)
MZ·80FI (Floppy Disk I/O Card)
Optional Peripherals I
MZ·80FBK (Expansion Floppy Disk)
MZ·80FB (Floppy Disk) :J
• The MZ-80B. ste'pped up version of the MZ-80K, is a personal computer with many new functions,
• Using a Z-80 processor (4MHz Version} in the CPU, it is capable of high speed data processing.
• It has a keyboard touch that's ideal for a professional operator and is equipped with a 10 numerical
keys and 10 function keys,
• The cassette-recorder, using an electromagnetic mechanism, can be stopped/started remotely.
Programs and data can be recorded automatically.
• With the optional expansion port, 1/0 card Can be set in the body of the MZ-80B for peripherals
such as a floopy disk, print~r, etc.
SHARP CORPORATION

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r---------Contents---'-----------------....
MZ-BOB
Specifications. , , , , , , , , , . , , , , , , , , , , . , . _ ....... _ ... , ... - - . . .. 1
System configuration
and nomenclature of MZ-80B. , , , , ..•. , .... , . - . . .. 3
Configuration
of MZ-80B _________________________ . . . . . . . . . . ... 5
Trouble shooting guide. _ ..• _ •. _ .• __ . _ •• : _ •.• ___ • • . . . . . . . . . . • .. 7
CPU board section ••..••..•.••• _ ••••• ~ ••••••• -; •••••.••.••..•. 8
Power supply section ...... '. ' .. .- •• ' ............. , , , , . , , ••••• ' •• 0.' 0' 16
Monitor TV section, . , , ... ', , .. ,o.<:":-;"~". , ~"':', . .-, , ,", ';"~ -~' .:::~:~~~::",,:,"~, ~< . c~· 20
Cassette tape recorder section. , , ~ .•... :;- .. , . , " ........ '-~". , ... , , " -,
Printed wiring board and circuit diagram .•...•. 0" •••••••••••• , •••••
Disassembled view .....•.......•............... , . , .. , , , , , .•.
Packing method ••.. :' •••••....••••..••.••.•. : ••..••••.....•
OPTIONS and OPTIONAL PERIPHERALS
Expansion port MZ-BOEU .............. , ..................... .
Universal I/O card MZ-80102 .................................. .
Expansion graphic RAM MZ-80GMK
............................ .
Floppy disk I/O card MZ-80Fl. ................................ .
Floppy disk MZ·80F8, Expansion floppy disk MZ·80FBK .............. .
Replacement parts list, .. ' ... , ... , ...... , - . ' , .... , .......... .
Caution in Service
'" Maintain the safety []nd protecting ability of the apparatus
after service,
.. High voltage shall not be rised to excess specified level so as to
prevent This apparatus from the extra X·ray radiation.
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• MZ-80B General
CPU LH0080A (Z 80A-CPU) Key
Layout
Keys 92
Clock 4MHz ASCII Standard,
10 Numerical keys,
Memory
ROM 2K bytes Function keys, Cursor control keys,
Cassette tape deck control keys
RAM 64K bytes (dynamic RAM) Clock
function
Built-in
Editor function Cursor control; up, down, right, left,
Display 9" CRT (green display)
home, clear.
8 x 8 dot matrix Edit key
1) Characters; 1000
Delete key
~-,--.-
--._-- ----
(40 characters x 25 lines) Power supply AC 240V (50Hz)
2) Characters;
2000
Temperature Operating temp;
0° to 35°C
(80 characters x 25 lines) Storage temp; _15°
to 60°C
----
1), 2): software change-over Humidity
Lower than 80%
Cassette Standard audio cassette tape Weight Approx_ 16kg
Data transfer speed;
1800 bits/sec. .
---
_.-
Dimensions Width 45cm
Data transfer system; SHARP PWM
Depth 52cm
Manual or Automatic control Height 27cm
Sound output 400mW max. (440Hz) _
.. --
• CPU Board Section
CPU LH0080A(Z80A-CPU) 1 pc.
Programmable
l
--
.- .
--
counter
8253
1 pc.
PlO LH0081 A (Z80A-PIO) 1 pc.
. Programmable
ROM
IPL 1 pc. 12K bytes) !
Character generator 1 pc, (2K bytes) peripheral
8255
1 pc_
I
1--. interface i
RAM
Standard; 16K RAM 32 pcs_
--- ---
I
(64K bytes) Other IC's
40 pcs. I
Video RAM; 1 pc. (2K bytes) I
• Power Supply Section • Graphic RAM
(I) PWB Section
------ -
Input
AC
240V (50Hz)
~-----
Output 5V
RAM
Static RAM; 4 pes. 18K bytes)
---- ---t------------ ._J
Other IC's 17 pes. .J
-5V
12V (stabilizing)
12V (non-stabilizing)
- ----
NOTE Specifications and appearance are subject to change without prior notice for improvement. In such
a case, the explanation here may be a little different from the product .
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• Display Section
l. General specifications
11.
Electrical specifications
Size
9"
Video output
40Vp-p standard (35Vp-p limit)
Vertical 60Hz (vertical),
lS.75kHz (horizontal)
Resolution
Horizontal
*The pattern of the left in
Horizontal •
the center of the picture
Frequency
must be clear. •
P~wer source DC
12V, 1.1 A ±1O%
Non-linearity
Horizontal; ±8% (±14% max.)
distortion
Vertical; ±8% (±12% max.)
Picture tube E2728B31; 9" 90° deflection
Geometrical Pincushion dist.; 1% {2% max.}
explosion proof type
distortion
Barrel disl.; 1% (2% max.)
Heater;
12V, 7SmA
Trapezoidal dist.; 1% (2% rr,3x.)
1----.
Parallelogram dist.;'o (2.5° max.)
.'
IC's 2
pes. High voltil<;Je
Zero beam; 11.0kV
-I (1O.0kV,
min.,
Transistors 7
pes.
I
12.0kV, max.)
----
Diodes 13
pes.
Power su pply
I
DC12.0V, 1.05A (1.2A max.)
-
Working range 12V ±10% •
Sound output
400mW max. (440 Hz) Scan size
Horizontal; 10% (15% max.)
Speaker Bern, round dynamiC type
I
Vertical; 10% (15% max.)
(32I2l
Horizontal
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Control knobs
Volume, V-Hold, lock"in range I
±300 Hz (±100Hzlimit)
Contrast, H-Hold, Vertical [
Brightness, Focus
lock-in range I
-12 Hz (-6 Hzlimit)
~-
--
Working
440 Hz (OdB)
-10'e to SO°C
Audio
frequency I
-10dB ±4dB at 100 Hz
temperature
Characte~istic I
-12dB ±4dB at 10kHz
-•
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Sound maxi- I 400mW at
440 Hz
mum output
'- ~
-----
--
• Cassette Tape Recorder Section
--
System PWM recording
BiaSing DC system
5V ± 5%
Erasing
DC system
Power source
12V ± 5% (stabilizing) •
9.5V'"V16.5V (Non-stabilizing) Playback 667
J1sec. to 333 J1sec.
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sensitivity (standard)
Semi-
22 transistors Working
I
_10
oe
to +40°C
conductors
13 IC,
temperature
~~
9 diodes
--
Storage
-2SoC to +65°e
Tape From
C30 to e60
,
temperature ,
---
Tape speed 4.75 cm/sec.
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Track
2-track monaural type
~ -
Motor
Electronic governor motor (12V}
L-_~
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The MZ·80B system and expansion thereof are shown in the block diagram 0.1 Fig. 1. The inside of the dotted lines
is the constitution of the MZ-808, in which units enclosed in thick-line frames are optional ones. In the expansion
port, interface cards can be inserted up to six pieces. The devices outside the dotted lines are optional peripheral
devices and user's devices.
Figures 2 and 3 show the
front view and rear view of the MZ-80B, identifying the parts with names.
r---------------------i
I MZ-80B
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CRT
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Display I
~ f I
Graphic
RAM
CG Rom
(RAM 11 8KBI
I
'v---
(MZ-80GMKI
32KB
2KB
I I
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Graphic
Universal
c!-
RAM 18KB
Interface
PTR, PTP, etc.
RAM
IMZ-SOI021 I
32KB
V-RAM
+
Character
MODEM
2KS
~
RS-232C Teletvpewriter
Boot Rom
~
I
etc.
2KB
IEEE-4SS
1.-
IEEE-488 Standard
~~
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"W Interface
I devices
CPU
°0
I
System Bus
0.
00
ZSOA
f-'
xN
w~
Printer
t
Printer
Interface
IMZ-SOP5')
FD Interface
1
Floppy
f- (MZ-SOFIJ Disk
I
(MZ-SOFB/FBKI
Key Board I
HD
I I I
;<-
Interface
Hard Disk
Sound
Ir-
Cassette r
f-
MCR
l~
Mark Card
Interface
Reader
Timer
1.1-
Calor
Color Display
Intelligent
Interface
I
Terminal
I I
I
Color
Display
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______________ ---l
Fig_ 1 MZ-80B System and Expansion o
Options
D Future Development
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Nonglare ~ _________ +
Screen
Special function _____ _
Keys
Main Key Board ______ --:
Brightness _______ ,
Control
Sound
Volume Control
Power recePtacle---""
Power Switch ---------i..----
Ground-----------J
r--------------------------------- 9" CRT Display
r------------ Cassette Tape Compartment
!~~~J,~~~?i~i~~ .. -, Cassette tape Counter
~0ii!C=1-.
Fig. 2 Front View of MZ·80B
Fig. 3 Rear View of MZ·80B
Cassette deck
~--- Control Keys
Cursor
Control Keys
IPL reset switch
~---"o<,e' Switch
I/O Module
Access Window
No. 1-6

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• •
• •
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I •
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The system diagram of the MZ-80B is shown in Fig. 4. With the CPU and its bus lines in the center, the memorie~
(main memory, boot ROM, V-RAMI, keyboard, cassette recorder, CRT display, clock, reset circuit, and I/O port are
arranged, showing the relations with PlO,
8225, 8253, to constitute the MZ-80B.
RESET
SWITCH
'IPL
RESET
SWITCH
FRAME
GROUND
-11-
AC
I
nPOWER SWITCH
~
1 1
POWER UNIT
POWER
TC!ITv
ONIPL
-5V
RESET GROUND
C R
E
L-.
S
0 E
T
A
Z80A
CPU
"
4>
CRYSTAL
16 £ 4MHz
OSCILLA-
MHZ'l TOR
31.25kHz
Jl
L
E
D
'IPL RESET ".." Initial Program Loader RESET
-5-
Main Memol)'
RAM
32k bytes
IPL
ROM 2k bytes
".
RAM
32k bytes
ADDRESS
SELECTOR
"r I
-,
I1
m
ADDRESS BUS
1 11 1
u:
11
IL
JI
J ~
T LB S
r-
HAN
Z80A-PIO
POK
4>
~
I
KEYBOARD
r--
Fig. 4 r

CHARACTER
SPEAKER
GENERATOR AUDIO .n
RoM 2K bytes
r;::::
AMPLIFIER
11
vLj
-"
V-RAM
l-<--
, CRT
DISPLAY
-CHARACTER
-:v'
2k bytes
I'r
OSCILLA·
S
TOR SHIFT
E
f=4
L , REGISTER
E VIDEO GENE·
C
V·RAM
l-
T , RATOR
GRAPHIC I
------I
0
-"
8k bytes
rt 11 T
, I I
11 11
11 J1 -
=
11
11 11
11
V·RAM
=
11
11
11
P GRAPHIC II
.
11 11
, E 8k bytes
ADDRESS BUS
R (OPTION)
I
=i~ I II1I
11
, P
H ,....,
E 0
IH III
v R P
r A T
L I
[)NT
BU
I 0
v / N
~
0
,
!.-
~ ~
P
SHAKE 0
8255 8253 R
.
CO Cl
C2 T
11
--
]~~
CASSETTE TAPE CASSETTE TAPE
DECK I/O DECK
~-80B System Diagram
I
No. I
I
No. 6
•

The system comprises four main units.
For quick solution to most operational difficulties, follow the chart below to find which unit is causing
the problem.
Start
Power on
YES
YES
Is the CPU
board normal?
YES
YES
End
NO
NO
NO
N9
-7-
Repair the power -supply
circuit.
Repi3ir the monitor TV.
Repair the CPU board.
Repair the cassette
recorder.
•

The CPU b~ard is composed of the following six blocks. When it malfunctions, first locate which block is concerned
with the malfunctions, and next try to check for its corresponding circuits; the wiring diagrams of every block will
be shown separately.
CPU inoperative
Display
block
Cassette
recorder
block
Keyboard
block
Audio
block
NO
Clock block
NO
YES
YES
YES
YES
YES
<e
noperative YES
immediately after >------0-1
power ON,
NO
Check RAM and its
peripheral circuits {by
usinfj RAM checked,
Check video
RAM circuit.
Check IC23
(8255) and its
peripheral parts,
Check
IC24
(LH0081A) and its
peripheral parts.
Check IC23
(8255) and its
peripheral P<lrts.
----'
Check IC19
(8253) and its
peripheral parts,
Check
memory circuit
and its peripheral parts,
• Checki~g rnetl1ods()f~~h circuit -,,;
"I, "," .. ,,,' "_ • ",. '" _
:.l.C.By.tbuChinglC package by fingers:c .
.•. Ifthey seem too hot by heat gene~atiori;
2.
I(:::--j{ defective" le 'Idad 'is 'hea~'y 'or ~'~mporients are ~ouc~~- '"each' other (ROM and V·RAM are
. ex.~mpted f;~m this checking).
e, If.- a circuitry state changes to, an~ther; Sold~ring is- poor, socket contact is impro'per or printed-
wiring is erroneous.
By using a synchroscope:
• If the relation between input and output of TTL IC is illogical, this means defe.etive IC gate.
• Check if the voltage of TTL
IC is as specified: Highle,;el; over 2.4V"Low level; below O .. 5V.
• When the signal'is between the high and low levels, is ~here circuit t?uching or !C malfunction?
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