Sharp MZ-80P6 User manual

0
SHARP
• Printing paper
• Character printing
• Bit image printing
•
Paging
• Tabulation
• Feed
• Copies
• Alarm bell
I>f\CIG
2">.1.8~
~
(_o
,
oo
' KU
MA.
''
SERVICE
MANUAL
Dot Printer
MODEL
PDSM881
009-MZ
MZ-80P6
FEATURES
4
to
10
inch
width
fanfold
paper
.and
8.3
to
8.5 inch
width
sheet paper.
Four
character
sizes
are
possible.
Printing
is
possible
with
dot
units.
Number
of
li
nes
printed
on
1
page
can
be
determined.
Both vertical and
horizontal
tabulation
control
is
possible.
,Switch
for
line
by
line paper feed and paper feed
in
page
units.
Control
is
also possible
through
software.
Simultaneous copies,
up
to
3
pages
including
the original,
are
possible.
Alarm
bell sounds
to
warn the user
of
mechanical
trouble,
lack
of
printing
paper, etc.
• Bi-directional printing
Along
with
bi-directional
printing,
there
is
very effective
printing
thanks to
the
use
of
logical seeking.
(Except
for
bit
image
printing
or
for
non
line
• Printing ribbon
space
mode)
lt
can
be
easily
put
in
and taken
out
without
getting ones hands
dirty
because a special cartridge
ribbon
is
used.
SHARP
CORPORAT
·
ION

------
----
Contents-
- -
--
-----
Specifications
Precautions before servicing .
....
.
Explanation
of
MZ-80P6
0 0 0 0 0 0 0 •
Troubleshooting
CPU
board
..
0 0 0 0 0 0 0 0 •
••
•••••••
• 0 • 0 0 0 0 0 0
••
0 0 •
Adjustment
of
head
driving
coil energizing pulse
width
Power
supply
section
...
. .
0 0 0 0 0 •
Functions
of
printer
parts
...
0 • 0 0 • 0 0 0 • 0 0 0 0
•••
Replacing
of
main
printer
parts
0 0
•••••
0 0 0 0 0 0 0 0 •
Replacing
ink
ribbon
from
cartridge
0 0
••••••••
0 0 0
1
2
3
7
15
16
17
22
36
Repair procedure
for
printer
mechanism
0 • • •
•••••••••
0 0 0 0 0 • • • • • • • • • • • • • • • • • • • • • • • • •
39
Circuit
diagram and
printed
wiring
board
0 0 0 0 •
Packing
method
0 0 0 0 0
••••••••
0 0 0 0 0 0
•••
Disassembled views .
0 0 0 0 0 • 0
••••
•
••
0 0 0 • 0
Replacement parts I
ist
.....
0 0 • 0 0
••
•••
••
0
54
60
61
65

SPECIFICATIONS
• General
Item
Specification
Printing
method
Serial
impact
dot
matrix
Feed
method
Variable sprocket feed
or
fric-
tion
feed selectable manually
Kinds
of
characters
I
230 kinds
Character make-
up
I
8(H) x 9(W)
dot
matrix
(normal
size
character)
Line-to-line
space
1/6 inch or determined by pro-
gram
No.
of
digits
Page
Printing
speed
80 digits,
40
digits, 136 digits,
68
digits or determined by program
66 lines/page (line
space
mode)
or determined by program
80 cps (characters per second)
(ordinary
size
characters)
Printing direction
Bi
-
direction
for
I
ine
space
mode
of
character
printing.
Uni-
direction
for
bit
image
printing
and non line
space
mode
of
character printing.
• CPU Board Section
Item
Specifications
CPU
8085A
(Data process
1/
0)
8039P-6 (Step
motor
control)
ROM
2732
*
(8085A
control
and
CG-ROM}
2716
(8039P-6
control
ROM}
1/0
counter
8155
IC
Other IC's 17
Head drive 2SD986 X 8
TR
Step
motor
2SD986 X 8
TR
---
-
Item
Printing paper
Copies
Printing paper
thickness
Ink
ribbon
Head
life
Interface
Specifications
Fanfold
paper
(4-1
0 inch wide}.
Cut
paper sheet
(8.3-8
.5 inch
wide}
Max.
of
3 copies (including
original)
Within
0.3mm
Special cartridge
ribbon
Approx.
50
million
characters (14
dot
character
printing)
8
bit
parallel interface
Power supply
AC
220V
±1
0%
50Hz
AC
240V
± 10%.
50Hz
Power consumption 75W
Working temperature! 5
to
35
°C
Storage temperaturf;)
I
-20
to
50°C
External -dimensions
I
App!fOX.
Weight
377(W}x
352(D)
x 1
05(H)mm
(including
an
assistant guide)
Approx.
7.2
kg
• Power Supply
Unit
Item Specifications
Input
AC
220V
±1
0% 50Hz
AC
240V
±1
0% 50Hz
Output
DC
26V
(21.5
to
26.5V}
DC15V
.
DC
5V
*ROM
2732
(I
C16}
is
not
standard and needs
to
be
ordered separately
because the programs being stored
are
different
by the
computer
to
be
connected.
Types
of
ROM
Host
comput
.er Applicable model
of
ROM
MZ-808
MZ
-8BP5R
MZ-80K
MZ-8KP5R
(Under development}
MZ-80A
MZ
-
8AP5R
(Under development) (Under development)
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.
-1-

I
PRECAUTIONS BEFORE SERVICING
•
The
printer
mechanism
is
fixed
to
the
chassis
with
four
screws
to
keep
it
from
being
damaged
by
vibration,
etc.
during
transport.
Remove
these
screws
when
using, main-
taining
or
repairing
the
printer.
Fix
the
mechanism
again
with
these
screws
when
transporting
the
printer.
:
111111111
H
0
Il
l0 °
0
111111
111'
11111111111
°
0
Remove the fastening screws
• Do
not
apply
external
force
to
the
print
head,
such
as
by
touching
it
when
it
is
operating.
•
The
print
head
becomes
very
hot
so
do
not
touch
it
with
your
hand
until
it
cools
down
sufficiently.
• Do
not
print
when
the
ink
ribbon
is
loose.
• When servicing
and
checking
a
printer
that
has
been
used
for
a long
time,
remove
dirt,
fuzz
and
dust
from
th~
inside,
and
oil
the
mechanism.
•
There
are
two
types
of
oil,
G2
and
02.
Use
the
proper
oil
for
each
oil
point.
(Refer
to
page
63,
64
for
oil
points.)
•
There
are
screws
and
nuts
which
are
fixed
and
then
locked
with
paint
for
vibration-
proof
etc.
during
transport.
Paint
the
screws
to
lock
them
after
disassembling
and
replacing
new
parts.
(Refer
to
page
63,
64
for
the
pointsto
be
painted
to
lock
the
screws.)
•
To
hold
the
printer
mechanism
only,
hold
at
the
points
illustrated
below.
Especially
do
not
hold
the
paper
sensing device
and
the
paper
guide
section.
-2-

EXPLANATION
OF
MZ-80P6
• Construction
Model MZ-80P6 consists
of
a locig
1,
logic
2,
print
head driver,
motor
driver,
printing
mechanism,
control
switches,
and power supply,
as
illustrated below.
Control
switches
Printing
mechanism
~--------·
I
Logic
1 I
(8085)
Print
head
driver
I
Print
head
I
I
I I
I
Timing
belt
motor
Logic
2 I
(8039)
Motor
driver
I
'
I
Paper
feeding
motor
I
I
I
Sensor I
I
L._
________
....J
• Explanation
of
Logics
and Drivers
1. Block diagram
The
printer
employs
two
microprocessors,
8085
and 8039. The
former
is
primarily
used
for
data process and
print
head
control,
and the
latter
for
stepping
motor
control
and
control
switch
input
process. Employed external
ROM's
are
2732
and 2716. The
former
stores processing programs and condensed characters
for
the micro-
processor 8085, and the
latter
processing programs
for
8039.
The
8155
is
a
RAM
with
1/0
ports and
counter/timer
and
used
in
conjunction
with
the 8085. Its capacity
is
256 bytes
of
which
136
bytes
are
used
for
storing data and the rest
for
a
work
area. The
1/0
ports
are
connected
to
the parallel interface,
print
head drive
circuit,
control
bus
to
the 8039, and display
circuit.
The
8039
incorpo-
rates
1/0
ports and
RAM
(128 bytes), and connected
to
the stepping
motor
drive
circuit,
external sensor
circuit,
and
control
bus
from
the 8085,
through
the
1/0
ports. The
RAM
is
used
as
a
work
area.
Interface
(Option
terminals)
STATUS
Print
head
drive
circuit
IRT
-3-
Motor
drive
Sensor
circuit
8039
CPU,
RAM
,
1/0
PORT
~
Power
supply
I

2. Reset circuit
(1)
At
switching
on
of
power
supply
The
circuit
forms
a
reset
signal
by
making
use
of
a
charging
time
of
a
resistor
R
17
(10KS1)
and
a
capacitor
C9
(47pF)
and
resets
IC13
8085,
IC12
8155,
and
IC21
8039.
+5V
ISI~§
4
f
Rl7
IC5
RIG
IOK
LSI4
IOOlt
13
CLAMP'
......
~~ilv,......_+-~
ll
~
,.+
I
C5
il~C9
IOOOP
,..,47)l/16V
(2)
At
momentary
interruption
and
turning
off
of
power
supply
IC5
LS14
12
3
Z2
RESET
+5V
-
---:~"
Leading edge
of
/
/
/
/
power
supply
1
~i=::::::!..._
____
_
Reset signal
If
+5V
power
supply
is
reduced
below
approx.
4V,
the
clamping
circuit
is
actuated
to
form
a reset signal.
Whereby,
all
the
circtJits
are
reset
at
momentary
power
supply
interruption
to
protect
the
programs
and
drive
circuits
from
the
voltage
drop
of
the
+5V
line.
When
the
power
supply
is
turned
off,
a reset signal
is
generated
at
the
same
time
of
interruption
to
protect
the
drive
circuits
from
faulty
operation
due
to
the
residual
voltage
determined
by
the
time
constant
of
the
power
supply.
+15V
+5V-v-
~~-.-.-=-.-.-.-.~CL~.-.-.-~r-.-.-.-~
+5V
I
8085
®
Pin
V:1V/div
H:20msec/div
8085
@ Pin V:
1V/div
H:5msec/div
Reset
signal
waveform
at
power
supply
switching
on
Reset
signal
waveform
at
power
supply
switching
off
3.
8155
(256 bytes RAM, with
1/0
ports and timer)
136
bytes
of
the
RAM in
the
8155
are
used
for
the
character
code
storage
area
of
one
line
character
codes
and
the
rest
for
a
working
area.
Data
(RD
1
to
RD
8)
from
the
parallel
interface
is
input
from
the
1/0
ports
(PA
0
to
PA
7)
and
stored
in
the
accu-
mulator
of
the
8085
where
it
is
identified
whether
the
data
is
character
data,
control
code,
code
other
than
those
listed in
character
code
table,
or
image
print
data.
If
the
data
are
character
data,
they
are
stored
in
the
above
mentioned
RAM
up
to
one
line.
When
one
line
data
are
accumulated,
the
8085
reads
dot
patterns
cor-
responding
to
the
character
data
from
the
character
generator
(2732)
and
outputs
the
pattern
to
the
PBo
to
PB1
of
the
8155.
With
the
image
print
data,
they
are
not
stored
in
the
RAM
but
are
output
to
PBo
to
PB1
in
every
one
piece
of
data.
When
character
printing
data
are
input
and
being
printed,
an available
space
is
judged
and
the
bi-directional
shortest
printing
is
made.
In
the
image
printing
and
the
condensed
mode,
the
mono-directional
quick
return
printing
is
employed.
The
8155
has also a
function
of
the
timer
and
the
timing
of
half
dot
is
formed
by
receiving
clock
signal (2MHz)
from
the
8039.
-
PC
o PAo
RDA
-
STATUS
RD
l
PC1
~
)
8039
p24
PC
2
DOT
TIMING
PC3
RDs
PA7
ONLINE
LED
PC4
POWER
LED
PCs
PB
o
FROM8039
\
PIN1
2MHz
TIMER
IN
s
PINS
To
8085
RST7.5
TIMER
OUT
PB7
8155
-4-

4.
8039
(CPU with
128
bytes
RAM
and
1/0
ports)
The
8039
is
used
primarily
for
controlling
the stepping
motor.
lt
outputs
control
signals
from
P
1 0
to
P
1 7 •
PM
1A and
PM
1
Bare
a
driving
pulse
of
the
timing
belt
motor,
and HOLD1 and HO
LD2
control
the
timing
belt
motor
to
select normal characters (80 characters/line)
or
condensed characters (136 characters/line).
PM2A,
PM2B, and
HOLD3
control
the paper feeding
motor.
These
functions
are
generated
by
decoding
control
data
from
the
8085,
input
to
D8
0
to
DB
7.
Signals
for
data
communication
between
8085
and
8039
are
input
to
and
output
from
P2
4
(from
8155
PC
2)
and
P2
7
(8039
READY).
Square wave
of
2KHz
for
signaling the buzzer
is
output
from
P
1 7 .
DB
o Pto PM1A
P11
PM1B
DB
7
P12
PM2A
A
s
~
P
20
Pt3 PM2B
I t
P1
4
At
o P
22
HOLD1
FROM
8155PC2
P24
Pts
HOLD2
FEED
SW
P
25
Pt
6 HOLD3
T.O.F
SW
P
26
p17
BUZZER
8039R
EADY P
27
5. Print head drive circuit
If
dot
pattern
and
dot
timing
pulse are
output
from
I
/0
port
IC8155, electric
current
flows
through
the
print
head.
Dot
timing
pulse triggers
the
555
through
a
circuit
for
generating
short
duration
pulse
to
produce
print
head drive pulse
of
400J,lsec (at a power supply voltage
of
24V)
. The
print
head drive pulse
is
pulse-duration
modulated
with
a
power
supply
voltage
of
26V
(the pulse-duration
is
reduced at high
power
supply voltage and
increased at
low
voltage), and
the
energy supplied
to
the
print
head
is
whereby constant.
r -- -
Print
head
drive pulse
generator-
,----
- -
016
2SD986
-
"""2"
sv
-
I
CCN2)
I
f
I
I
PIN I
Br:5..5P<3
I
DOT
T
I
M
IN
~
PULSE
Z07
R
26
0525.6
68
0/2W
~
26v
RES
IC
3
I
-
C21
T062504P
I
0
OUJ
l
____
_
-,
I
Circuit
forming
pulse
of
short
duration
1
I
I
201<
R25
151<
Cl9
IOQOP
PIN 3
PIN
4
PIN
5
PIN
7
PIN
8
3.3)(
(RA2 3.
31<
xSl
I
I
I
I
L _ _
__
_
--
--
----
-- -
----_
I_.
-----
L
--
-
--
-
Print
head
drive
circuit----
-
_J
lll
r
ii
JMf
V :1V
/div
H:
500J.,Lsec
/d iv
Waveform
(at
test
printing)
at
555
®
pin
r- r-
r-
r--
~
---
'--
_
:___
__
--
V :1V /
div
H:
500J.,Lsec
/
div
Waveform
at
test
point
(at
test
printing)
-5-
1
.\
~
\.
f'-
I I
I
I
V :1
OV
/div
H :500J.,Lsec/div
CN2G)to@terminals
(at
test
printing)

6. Timing
belt
motor
drive
circuit
When
HOLD1
signal
is
low
and
HOLD2
signal high, the
018
2SB743
is
turned
on and the
019
2SB743
is
turned
o~f
to
pass
+26V
current
through
the stepping
motor.
In this
case,
the mode
is
SO-characters/line.
Contrarily,
when
HOLD1
signal
is
high and
HOLD2
signal
is
low,
current
of
+15V
flows and the mode
is
136-characters/
line. In
both
modes, the
print
head
is
driven
from
left
to
right,
or
vice
versa
by
transmitting
motor
drive sequence
pulse
to
PM1A
and
PM1
B.
If
both
HOLD
1 and
HOLD2
signals
are
turned
high,
both
018
and
019
are
turned
off
and a
holding
current
flows
through
the stepping
motor
through
the
R2
(120f2/5W). The
intention
of
the
holding
current
is
to
prevent
the step-out
of
the stepping
motor
due
to
vibration
etc.
while
the stepping
motor
is
standing still.
\J.
N \
1\ \ \
--
r-
-
V:10V/div
H:2msec/div
CN2@
to
@terminals
(At
test
printing)
7. Paper feeding
motor
drive
circuit
When
HOLD3
signal turns
low,
the
017
is
turned
on
to
pass
a
current
of
+26V
through
the stepping
motor.
In this situation, paper
is
fed
by
transmitting
motor
drive sequence pulse
to
PM2A
and PM2B. When HO
LD3
signal
is
high, a
holding
current
is
passed
through
the R1 (
120f2/5W).
~
~
~
r\
.\
.\ \
"
r-.,
\.:,
I I
r------
---------------
-~
I I
...
-
...
~
-I +
15V
I
I I
I
1
I
I
HOLD 2
I
I I
I I
V:10V/div
H:5msec/div
CN2
@
to
@
terminals
(At
test
printing)
r--------
---
I
- - --
:6~
-:5
:-
-
-l
:
HOLD 3
---'=Q
HOLD
I
I
I
I
I
I
I
1>"'---<..._-/~5~+--+---+---28
I
24---11---+--+---.<~1---+---'~
P.:...-.!::.OC
I
I
I
I
ICIB
LS04
ICI
LSO!S
D8
5!12778
Paper
feeding
motor
drive
circuit
I
Timing
belt
motor
drive
circuit
_L
__________________
_ _
-6-

T· ROUBLESHOOTING CPU BOARD
NO
NO
NO
NO
NO
NO
NO
NO
Go to "CHECK OF POWER
SUPPLY
CIRCUIT".
Go to "CHECK OF TIMING
BELT MOTOR CIRCUIT".
Go to "CHECK OF LED CIRCUIT".
Go to "CHECK OF SW CIRCUIT".
Go to "CHECK OF LINE FEED CIRCUIT" .
Go
to "CHECK OF TOP OF FORM CIRCUIT" .
cGo to "CHECK OF PRINT HEAD DRIVE CIRCUIT" . )
Go
to "CHECK OF TIMING BELT MOTOR CIRCUIT".
Go to "PAPER FEEDING MOTOR DRIVE CIRCUIT" .
Go
to "CHECK OF PRINTER INTERFACE CIRCUIT".
Che ck interfac e cards.
OK
-7-

Refer
to
waveform
(Page
6).
CHECK
OF
TIMING
BELT
MOTOR
CIRCUIT
YES
Check
timing
belt
motor
.
NO
NO
NO
NO
NO
NO
-8-
Check
8039
circuit.
Check IC2, IC6, and
surrounding
circuits.
Check
018
and
020
.
Check
8039
circuit.
Check IC2 and IC18.
Check
01
to
04.
74LS05
TD62003P
2S8743
S5277B
74LS05
74LS04
2SD986