
A A
CP21
08979
TECHNICAL
SERVICE
DATA
FEATURES:
EASY-READ
COMPLETE SCHEMATICS
WAVEFORMS
•
REPLACEMENT PARTS LISTS
•
PRELIMINARY SERVICE CHECKS
•
•
TROUBLESHOOTING TIPS
SEMICONDUCTOR
CROSS-REFERENCE

5AM
5
COMPUTERFACTS"
PRELIMINARY SERVICE
CHECKS
ATARI
MODEL
1025
cc
CM
O
This
which
malfunctions.
Check all
correct hook-up before making service
Replacement or repair of
necessary
TEST EQUIPMENT
CM
O
^
TEST EQUIPMENT
Digital
provides the
data
is designed for quick isolation and repair of printer
interconnecting cables for
after the malfunction has been isolated.
with
user
a
board or connectors
CPU
time-saving
connection and
good
checks.
service tool
may
AND TOOLS
Volt/Ohm Meter
be
Scope
Logic Probe
TOOLS
Phillips Screwdriver
Small
Screwdriver
Low Voltage Soldering Iron
Desoldering Iron
REPLACEMENT
ITEM
D1 Diode, GP15B
NO.
DESCRIPTION
PARTS
AND
DESCRIPTION
D2 Diode, GP15B
D5 Diode, GP15B
D6
F1
F2 Fuse, 1.75A @250V Fast Acting
Diode, GP15B
Fuse, 1.75A
@250V Fast Acting
M1 Print Head
M2 Carriage Motor
M3 Line Feed Motor
OSC1
Q1
Crystal,
HA17805P
IC,
7.37MHz
Q8 IC, iP8051
T1 Power Transformer, 4LP-45191-137
SAMS
The listing
constitute
Howard
replacement
from information
manufacturers
in
W.
Sams
of
any available
any
case a
& Co.
part. The
furnished
the
of
Howard
4300 West
replacement part herein
recommendation, warranty or guaranty
as to the quality
numbers of these
to
Howard W. Sams
particular
type
W. Sams
62nd Street, P.O.
suitability
and
parts have been compiled
Co.
&
replacement
of
part
does not
of such
the
. by
listed.
&
by
Co.
Box 7092,
Reproduction
content, in
respect to the
vp)
1986 Howard
West
4300
Printed
Indianapolis, Indiana
or
use, without express
any manner, is prohibited.
the information
use of
W. Sams
62nd Street,
in
U.S. of America
P.O. Box 7092, Indianapolis,
Co.
&
86CP14977
contained herein.
46206
permission, of editorial
No patent liability
U.S.A.
is
Indiana
DATE
or
pictorial
assumed with
46206 U.S.A.
8-86

10.5V
PRELIMINARY
SERVICE CHECKS
(Continued)
@
®@
(2H)@)(4F
AIN
CONTROl
'.'..:
PINS 18, 19
7.37MHz
Q8

MISCELLANEOUS
ADJUSTMENTS
FIRST CHARACTER PRINTING
Loosen screws fastening
Turn
motor assembly a
when the
stops at the home sensor
Figure 1. If changing position of
correct the print position, change the
of the carriage synchro-belt on the
teeth.
power is
turned ON, the print
1mm
1mm
I
POSITION
Carriage Motor to
little one way or
position within
motor assembly does
•
0.55-0.75mm
Home
Sensor
#e
CN10>-
a
PLATEN/PAPER
Remove the upper
screws. Adjust the
separator for
paper
paper separator
SEPARATOR
screws, see
clearance
1
Figure
ADJUSTMENT
loosen the
cover,
approximately
between
Figure 2.
ADJUSTMENT
bottom cover.
the other so that
returns and
head
tolerance, see
engagement
pulley
DETECTOR
0.5mm.
LEVER
paper
the
one
by
platen
Tighten
not
position
or two
separator
and the
the
PRINTHEAD
Print head adjustment
printer mechanism,
Loosen
mechanism. Move
gap between
0.5mm.
ADJUSTMENT
carriage shaft
carriage shaft
platen and print
should be
carriage
screws on
Figure
performed
assembly
forward or
head is
2
after repair of
frame, or print head.
the sides of
between 0.45mm and
the printer
backward until
ATARI
MODEL
1025

PRELIMINARY
SERVICE
CHECKS
(Continued)
©
©
MATCH
THE
POWER
(A) If
(B) Check
(C) If Diodes
(D) Check
(E) Check
(F)
(G) If
(H)
PRINTER
(A) Turn Printer
(B) If carriage
THE
NUMBERS
SUPPLY
the Printer
Diodes
Transformer
for
If 26V is
substitution.
for
missing
If Fuse
shorts.
(Q1)
Replace
Regulator
right.
should
F1 is
Diodes
for
a short.
CARRIAGE
Turn
move
check
Fuse F1 and
26V at pins
SERVICE
NUMBERS
ON
is dead check Fuse F2.
and
D5
D5 and D6 are good, check
26V at anode of Diodes D26 and D46.
missing check Main Control Board
5V
D1 and D2 good, check
IC
OFF, move
assembly
5 and
substitution.
(T1) by
at pin 2 of
Fuse F1.
open, check Diodes D1 and
(Q1).
ASSEMBLY
Printer
to Home position.
of
6
ON THE
THE
SERVICE CHECKS
for
D6
shorts.
INTERCONNECTING
Power
Regulator IC
(Q1),
if
5V is
D2
Regulator IC
check for 10.5V
pin 1 of
at
DOES NOT MOVE
carriage assembly
ON. Carriage assembly
does not move, check
Connector CN4.
to
for
the
for
by
CHECKS
TO
BE PERFORMED.
PRINT
®
(A) Check
good connection.
(B) Check for
D26.
(C)
Check
(D)
Check CPU
(E) Check
MISSING
©
(A)
Clean
(B) Check
nection.
(C) Check
(D) Disconnect
sistances
(E)
Check
(F)
Check
LINE FEED
©
(A) Check
DIAGRAM AND
HEAD WILL
the print
resistances of
Main Control
DOTS
print head
print
the flat
the print head
Main Control
WILL NOT
Connector
NOT PRINT
head
26V at anode
IC
(Q8)
IN THE PRINT
face.
head Connector
cable for broken
print
of the print
OPERATE
CN5 for
PHOTOS
cable
Connector
and
cathode
print head.
by substitution.
Board
by substitution.
PATTERN
CN3
or pinched
head
cable and
head.
by substitution.
Board
by substitution.
good connection.
WITH
for
good con-
check re-
CN3 for
of
Diode
lead.
(C) If 26V is
(D) If the
18 and
(E) If frequency
by
(F) Check
<M2).
(G) Check
(H) Check
missing, check
26V is present,
19 of the CPU
substitution.
resistances
CPU
the
the power supply.
check for
IC
(Q8).
is not
correct, check
of Carriage
IC
Main Control Board
(Q8)
substitution.
by
7.37MHz at pins
Crystal (OSC1)
Motor winding
by substitution.
(B)
Check
resistances of
(C) If the
(D)
(E) If Line Feed
PRINTER
resistances of
check
for 26V
Check Main
gear assembly
gears.
WILL NOT
COMMAND
(A) Check
(B) Check
(C) Check
Connector
for
good connection.
the
Printer
by
Main
Line Feed
at pins 5 and
Control Board
Motor is erratic
on the left
PRINT BY
CN6 or
cable between
substitution.
Control Board
Line Feed
6 of Connector
by
substitution.
or
stops, check
hand
COMPUTER
CN7 whichever
the
Computer
by substitution.
Motor
(M3).
Motor are
good,
CN5.
is
the
used
side for broken
and the
Ill

PRELIMINARY
SERVICE CHECKS
(Continued)
CN10
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BOARD
©
PRINT HEAD
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(BC)
CNS
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SWITCH
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PROTECTOR
SNAP LEVER
PLATEN
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PRINT HEAD
PLATEN/PRINT HEAD
ADJUSTMENT
0.45-0.!
PRINT HEAD
TOP
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INTERCONNECTING DIAGRAM
IV
INTERCONNECTING
DIAGRAM

PRELIMINARY
DISASSEMBLY
SERVICE CHECKS
INSTRUCTIONS
(Continued)
UPPER COVER REMOVAL
Remove platen
Loosen two screws
switch assembly
the front
side
upper cover
PRINT HEAD
Remove
Printer. Carefully
cable connector
beneath the print
and lift head
knob, remove
holding switch assembly and slide
backwards. Remove two screws from in-
of upper cover. Tip
from Printer.
REMOVAL
upper cover, slide carriage
remove print head cable plug from flat
located on the carriage
head. Push down print head lock lever
straight
up
PRINTER MECHANISM
Remove Printer
right. Disconnect
head.
Remove the flat
nector from
that fasten flat
connect all
P.C. board.
remove four
cabinet.
upper cover. Slide
print head cable plug and remove
carriage frame
connectors
Set
cable connector screw and the con-
cable to side of printer mechanism.
Printer
screws holding mechanism
Carefully remove
mechanism upright.
top cover by pulling upwards.
upper cover back and lift
assembly to right end of
assembly frame
from the carriage assembly frame.
REMOVAL
carriage assembly to far
assembly. Cut plastic tie-wraps
attached to
side down on
up
P.C.
board. Remove
soft cloth
a
to the bottom of
bottom case and set printer
print
Dis-
and
MAIN CONTROL
Remove upper
from Main Control Board.
Remove flat cable connector from
the tie-wrap which fastens
Cut
side of printer
Main Control
BOARD REMOVAL
cover assembly.
mechanism. Remove two screws
Board. Lift Main Control
Disconnect
Remove print head assembly.
carriage frame assembly.
the flat cable to the
from Printer.
PLATEN REMOVAL
Remove cabinet top
tion. Remove two screws holding paper
remove paper
right
from
side plate. Turn platen bearing
CARRIAGE
end
MOTOR REMOVAL
Remove the upper
disconnect
Carriage Motor leads.
Carriage Motor
from Carriage
Printer.
Connector CN4. Cut
PAPER FEED
Remove upper case.
two phillips screws
of printer
Printer.
mechanism.
cover. Lift scale bar to highest
separator. Remove C ring and platen
of platen. Pull left bearing side ways
cover. Remove the Main Control
Remove two
the bottom
to
Motor pulley.
MOTOR
REMOVAL
90°
and pull out platen.
the tie wraps securing the
screws
cover. Remove carriage belt
Lift Carriage Motor from
Remove Main Control Board. Remove
fastening Paper Feed Motor to
Remove Paper Feed
connectors
all
right
holding
Motor
posi-
bearing
from
Board,
the
left side
from
separator and
fastening
VI

ENVIRONMENT
.IMINARY
PREVENTATIVE
SERVICE
CHECKS
(Continued)
MAINTENANCE
Computers
dust and smoke
as much
around
Monitor, Printer,
perform
particles.
as commercial
the
Computer.
or
ELECTRICAL POWER
Variations in the
an AC
receptacle that
devices.
may
be needed to
line voltage
A
power-surge
cure the
KEYBOARD
Liquids
Computer
disassemble
water
cleaner
DISK
Clean the
Use only
Handle
Drives
an
spilled into
and let
and
DRIVES
carefully
can
old disk
power plug
the Keyboard
it dry.
lint-free
read/write
an
approved
knock the
in slot
to
and close
best in
a clean,
Even
Computers
Do not
other
power
can
is on
a power line
protector,
problem.
the
Keyboard can
from AC
and
Use a cotton
wipers on
heads
of
head
cleaning
preserve
disk
proper
head
door
cool
though
are
block
cabinet
devices.
affect
power-line
Do
ruin
power
outlet.
carefully
swab to
accessible
the
Disk
kit.
disk
out of
alignment.
during
area
home
affected,
vents
the
Computer.
not
used
not
it.
rinse
clean
connectors
Drives
head
transport.
that
is below
Computers
it is
of
any
Try
by appliances
conditioner,
switch
power
Immediately
Then,
if circuitry
the
Keyboard
between the
and
about
once
alignment.
If the
80 degrees
are
not
better
to
of the
Computer
to avoid
or other
or
non-interruptable
On
and Off
after
a spill
or
printed
keys.
contacts.
a month or
A
sudden
disk
drive must
Fahrenheit
affected
maintain
these
heavy
frequently.
occurs,
contacts
circuit
Use a
after
bump or
be transported,
cigarette
by
smoke-free
a
system;
fluctuations
current
power
disconnect the
are
contaminated,
board with
non-abrasive
100
hours
jolt
to the Disk
and free
smoke
area
Computer,
by using
demand
supply
distilled
contact
usage.
place
of
Store
disks in
handling
PRINTERS
Carefully
cleaner.
a blanket.
STATIC
Static
anti-static
vironment.
Do
ELECTRICITY
electricity
MONITOR
Use an
isolation
some
Monitors
the Monitor
when
pattern
preserve
the
their
precautions
vacuum
not
This
oil
can
the
the
discharge
mats,
sprays,
transformer
use
should never
is
being
glare-reduction
protective
usually
Printer
machine.
cause
tools and
HOT
a
changed
covers
found on
regularly.
The oil
components
can affect
materials,
with any
chassis
be left
(chassis
on for long
periodically.
feature.
and
never
the
back of disk
Wipe
will
collect
to overheat
the
Computer. In
and maintain
Monitor
connected
Use caution
touch
surface areas
abrasive
and
that
does not
periods
to one
of
the disk
protective
clean
grit and
fail.
order to
minimize
good humidity
come
side of
time
high
at
when
cleaning
surface.
covers.
using
dust.
as part of
the AC line).
brightness
anti-glare
Observe
a light
The
the
in
the
the
possibility,
the disk
all-purpose
dust will
act as
Computer
system since
The
face of
level except
screens, to
use
en-
VII

PRELIMINARY
SERVICE
CHECKS
(Continued)
CHASSIS-TOP
VIII
VIEW
ATARI
MODEL
1025

$fiM
o
_
S
COMPUTERFACTS
ATARI
MODEL
1025
S
CM
PRELIMINARY
CL
O
Block
Disassembly
IC Pinouts
Line
Logic
Miscellaneous
Parts List
Photos
Chassis-Top
Diagram
and
Definitions
Chart
SERVICE
ENCLOSED
Instructions
Terminal
Adjustments
View
Guides
CHECKS
Page
17
14
16
15
13
14
7,8,9
INDEX
4
SAFETY
Photos
(Continued)
Main Board
Safety Precautions
Schematics
Schematic Notes
Test Equipment
Troubleshooting
PRECAUTIONS
See page 29.
Page
5,6,11,12
2,3
o
D
§5
>
i-
->
5
o
to
13
en
13
10
10
SAMS.
The fisting
constitute
Howard W.
replacement
from
manufacturers
of any available
in any
Sams
part.
information
case a recommendation,
& Co. as to the quality and suitability
The numbers of these parts
furnished to Howard
of the
Howard
4300 West 62nd Street,
replacement part herein
particular type of replacement
W. Sams
warranty or guaranty
have been compiled
W. Sams
& Co. by
does
of such
part listed.
& Co.
P.O.
Box 7092, Indianapolis,
not
Reproduction
by
content,
in any
respect to the
1986
£
4300
Printed
Howard
West
62nd Street, P.O.
in
U.S.
the
or
without
use,
manner, is prohibited.
use of the information
W. Sams & Co.
of
America.
express permission,
Box 7092. Indianapolis,
Indiana
No patent liability
contained herein.
14977
86CP
46206 U.S.A.
of editorial
is assumed with
Indiana
46206 U.S.A.
or pictorial
DATE
8-86

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1986
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PARTS LIST
When ordering
parts,
AND DESCRIPTION (Continued)
state Model, Part Number,
and Description
ELECTROLYTIC
ITEM
No.
C3,C4
C11,
CI 2
RATING
2.2UF 35V
luF
CAPACITORS
35V
CAPACITORS
ITEM
No.
C22
RESIS1rORS (Power
ITEM
No.
RM1,RM2
RM3
RM4
RM5
RM6
(1)
Contains
(2) Contains
(3) Contains eight
(4)
Contains six
(5) On unit
FUSE
DEVICES
ITEM
NO.
RATING
250VAC
.1
Resistor
Resistor Network
Resistor
Resistor
Resistor
four
(4 ea.)
eight
(6 ea.) 5100 ohms.
number.
DESCRIPTION
MFGR.
PART No.
MFGR.
PART
Special)
and
RATING
Network
Network
Network (4)
Network (3)
(8 ea.) 1000 ohms,
(8 ea.) 5100 ohms,
(3)
1000
(1)
(2)
ohms.
No.
5%.
5%.
DEVICE
ITEM
No.
CI 3
C15
MFGR.
PART
IHR-4-102 (5)
IHR-8-102JA
IHR-8-512JA
IHR-6-512
IHR-8-512JA
MFGR.
PART NO.
RATING
2.2uF 35V
1 uF 35V
REPLACEMENT DATA
No.
(5)
(5)
(5)
(5)
PART No.
HOLDER
NTE
MFGR.
PART
No.
WORKMAN
PART No.
NOTES
§5
r-
o
in
>
F1.F2 1.75A @
COILS
ITEM
T1
Fast-
&
TRANSFORMERS
No.
Acting
Power
250V
Transformer
MISCELLANEOUS
ITEM
No.
LI 7
LED
Ml
M2
M3
M4
0SC 1
SK
SW1
SW2
SW3
Ferrlte Bead
LED
1
Print
Carriage
Line Feed Motor
Home Position
Crysta
Network
Switch
Switch
Switch
PART
Head
NAME
Motor
FUNCTION
Sensor
MFGR.
PART
No.
MFGR.
PART No.
Power,
7.37MHz
Power
Print
Paper End Detector
Red
OTHER
IDENTIFICATION
4LP-45191-137
NOTES
NOTES

TEST EQUIPMENT
Equipment listed
Test
measurements
and is compatible with most types
TEST EQUIPMENT (COMPUTERFACTS)
Equipment Name
OSCILLOSCOPE 1570A,1590A,1596
PROBE
LOGIC
LOGIC PULSER
DIGITAL VOM 2830 DVM37,DVM56,SC61
ANALOG
VOM 277
Manufacturer
by
illustrates typical or equivalent
B & K Precision
Equipment No.
DP51
DP101
used by
field service
Sencore
Equipment No.
SC61
equipment
technicians.
used by SAMS' Engineers
to
obtain
ISOLATION TRANSFORMER TR1
FREQUENCY COUNTER
10,1604,1653,1655 PR57
1803,1805 FC71.SC61
COLOR BAR GENERATOR 121 1A,1248,1251,
RGB GENERATOR 1260
FUNCTION GENERATOR 3020
HI-VOLTAGE PROBE
HV-44
VOM/DMM
Accessory probes
TEMPERATURE PROBE TP-28
CRT ANALYZER
467,470 CR70
POWER SUPPLY
If Printer is dead, check AC
check Diodes D5
and D6 for shorts. If Fuse
check for 31.5V AC between pins 3 and
tween pins 1 and
correct, check Power
2 of Connector CN1.
and AC Line Choke (RC).
Check for 26V at cathode
rect, check SCRs D7
Check for 10.5V at cathode
ing check Fuse
fiers (D1 thru D4), Voltage
F1. If Fuse F1 is open, check
components.
LINE FEED
MALFUNCTION
Turn platen knob by hand, if
check the
platen turns
(M3). Check for about 73
and
gear assembly on the left
smoothly, check resistance
pins 2 and 6
5,
and between pins
CN5. If Printer will not
Fuse (F2). If Fuse F2 is
4 and 9.8V AC be-
If voltages are not
Transformer (T1), Power Switch (SW1)
of Diode D13. If voltage is not
and D10 and associated
of Diode D4. If voltage is
Regulator IC
platen
(Q1)
not turn smoothly,
does
side of the Printer. If
of Line Feed Motor
ohms between pins 1 and
4
print while in self test mode,
and 6
1260 CG25.VA62
HP200
TROUBLESHOOTING
waveforms
If waveforms
(Q5).
by substitution. If waveforms are
(Q8)
Q3 and Q4 and Driver ICs TR1A and TR2A.
CARRIAGE ASSEMBLY DOES NOT MOVE
Check the
60 ohms between pins
and pins6and
correct replace Carriage Motor.
If the carriage assembly moves erratically check
Position
nection. Check Interface IC
Q4.
MISSING DOTS IN PRINT
Actuate self
thru 14 of Connector CN3.
check
resistance
missing at any pin check
signal
is low about 5V P-P check
F2 is good,
components.
Bridge Recti-
associated
and
5,
of Connector
open,
cor-
miss-
pins
check
3
at pins
25 thru
are missing, check
resistance
4 of Connector CN4. If resistances
Sensor (M4). Check
and 33 thru
28,
of the Carriage Motor
and
5
pins
1,
Connector
by substitution.
(Q5)
PATTERN
test mode.
Check for 26V P-P signal
of Print Head (M1). If 26V
If signal is present
CPU IC
(Q8)
Driver
36 of Interface
IC Q5 and
present, check
5 and
3,
CN10 for
(M2),
pins
CPU IC
check for
6 and
are not
good con-
Check
at pins
on all
P-P signal is
by substitution.
ICs (IRA3 and IRA4).
IC
ICs
2,
Home
IC
8
pins,
If
10

C13
012
C2
D51 C3
R3
R6
R7
R8
C17
P
R29
D50
D20
C6
D29
D17
D18
R30 R9
D15
D43
D26 D22
C5
D24 052 D54
D45
D44
R15
031
033 C7 C10
R14 R13
R12
R11
RM3
C8
R10
RM1
R19 R17
RM2
R18
R32
C11
R33
C21
R20
C12
RM5
R21
C13
C15
C14
3*
O
>
r-
o
n

5.0V
D5
D6
ARROWS ON IC'S
NOTE:
W. Som«
Howard
A
12
tflUtt!IMMaJ
BCE
TR12
F1
8
INDICATE PIN
Photo
TR11
C
1
E
UNLESS
D27
26.0V
NOTED
TRA2
030
CN5
B C
TR2
L17
D55
034 CN6
B
C
TR3
B C
TR4
E
lit I
BCE
TR5
CN7
ill
E
TR6
E
C B
B
C
TR1
TR8
CN9

PIN IC IC IC
NO.
02 03 04
1 H
L L L
2
3 H P
4 L L
H
5
L L L
6
L L
7
L L
8
9
P
10 L
11
P
12
L
P
13
H H H
14
H
P
P
L L
P
L L
P
P
P 3
L
P
L 7
L 8
P
P 11
P 13
LOGIC
PIN IC PIN
NO.
1
2
4
5
6
9
10
12
14 P 34
15
16 P 36 P 16
CHART
NO.
05
L 21 L 1
H 22
L 23
L 24
H
25
L 26
H
27
P 28
P
29
P
30
P
31
P 32
P
33
P
35
IC PIN IC
05
H 2 P 22 H
H
H 4 P
P
P
P
P
H
H 10 L 30
H
H
P
P
H
PIN
Q8
NO.
NO.
P 21
P 23
3
24 H
P
5
6
7
8
9
11
12
13 L 33 P
14
15
25
P
26 L
P
27
H
28
L 29 H
H 31 H
H
32 P
34 P
L
H
35 P
P
36
IC
08
H
H
L
H
P
P
P
17
18
19
20
1.
2. Maintain
3. Remove
4. Use extreme
5. Use
6. Use an isolation
7. Do not remove
8.
9.
10. Periodically
11. The Printer
12. Instructions
13. Never expose
_a_
e
+
an isolation
Use
AC
line
AC power from the Printer before servicing or installing
ES devices
static electricity.
ly available discharging
Do not use freon-propelled
This Printer
not
cabinet.
sources.
Circuitry not used
Circuitry used
parts list
See
Ground
Voltages
Waveforms
are integrated circuits and semiconductors "chip"
caution when handling the printed circuit boards.
grounded-tip,
a
defeat the AC plug
is equipped
examine the
cabinet is
should
This
in some
measured
and voltages are
noted otherwise.
Voltages,
waveforms and
running in Self-Test
Waveforms
switch
coupling
taken with
in Calibrate
on
AC input to
measured when necessary.
width with
of each waveform.
Item
justment
DC
numbers in rectangles appear in
instructions.
17 P
18
19
20
SAFETY PRECAUTIONS
transformer for servicing.
voltage at rated input.
Drain off any
electrostatic
wrist strap device. This
charge on
should be removed prior
low voltage soldering iron.
(times
or install board, mechanical or electrical
probe
10)
with
safety feature.
on scope.
sprays. These can generate
grounded three-pronged AC plug. This
a
AC power cord for damaged or cracked
equipped with vents to prevent heat
given,
be
could cause shock or equipment
the Printer
especially to children, that
damage.
to water. If exposed to water
SCHEMATIC NOTES
in some
"0"
reference
view waveforms
reference voltage
versions
versions
with digital
logic readings
mode.
triggered scope
position,
voltage
meter.
taken
scope
after DC
Each
given at the
from ground,
taken with
Sweep/Time
and
input set
waveforms.
reference
waveform
bottom
the alignment/ad-
Printer
for DC
Switch to
is 7.5cm
37
P
38 H 18 P 38
L 17 P 37 P
P 39 H 19 P 39 P
L
40
H 20
electrostatically
L
sensitive devices.
components.
Some
your body
parts, or other peripherals with
electrical charges sufficient
build-up. Never block, cover, or obstruct
objects should not be dropped or pushed into
turn the unit Off. Do not
Supply
Controls
Terminal
Capacitors
Electrolytic
unless
Resistors
Value
Measurements
is
line
semiconductor devices can
by touching a
plug must fit into
insulation.
voltage
adjusted
identification
noted.
in
(
noted.
applying
to
maintained as
are 50
capacitors
V2W
are
used
)
taken
known
for
volts or
or less,
some
in
earth ground.
power to the unit
Printer AC power On.
to damage semiconductor
grounded
a
the Printer
place
shown at
operation.
normal
not be
may
less, 5%
volts
are 50
unless noted.
5%
versions.
switching as
with
P
40
H
Examples
of typical
be damaged easily
Wear
commercial-
a
under
AC power
outlet. Do
these vents.
the vents of the
near possible
input.
on unit.
found
noted.
unless
or less, 20%
shown,
test.
devices.
water
unless
unless
by
o
ro
13

DISASSEMBLY INSTRUCTIONS
UPPER COVER REMOVAL
Remove platen knob, remove
Loosen two screws holding
switch
assembly backwards. Remove two screws from
the front of
side
upper cover
HEAD
PRINT
Remove upper
Printer. Carefully
cable connector
beneath the print head.
lift
and
head straight
PRINTER
Remove
right.
head. Remove
nector from
that fasten flat
connect
P.C.
remove
cabinet. Carefully
Printer
Disconnect print
all connectors
board.
four screws
mechanism
upper cover. Tip upper cover back
from Printer.
REMOVAL
cover, slide carriage
remove print
located on the
from
up
MECHANISM
upper cover. Slide
the flat
carriage frame
cable to side of printer
Set Printer
upright.
REMOVAL
head cable plug
cable connector screw and the
attached to P.C. board.
up
holding mechanism
remove bottom
cover
top
switch assembly and slide
assembly to right end
head cable plug from flat
carriage assembly
Push
down print head lock
the carriage assembly
carriage assembly
assembly. Cut plastic lie-wraps
side
down on a soft cloth
case
MISCELLANEOUS
pulling
by
upwards.
and lift
and remove print
mechanism.
Remove
to the bottom of
and
set printer
in-
frame
lever
frame.
far
to
con-
Dis-
and
MAIN CONTROL BOARD REMOVAL
Remove upper cover assembly. Disconnect
from Main Control Board. Remove print
Remove flat cable connector from carriage
the
Cut
side
Main Control Board.
PLATEN
of
Remove
tion.
tie-wrap
of printer mechanism. Remove
REMOVAL
cabinet
Remove two screws holding
remove paper
from right end of
side plate. Turn platen bearing
which fastens the
Lift
Main Control from
cover. Lift
top
separator. Remove
platen.
Pull left bearing side
flat
scale bar to highest
paper separator
C ring and platen
90°
and pull
CARRIAGE MOTOR REMOVAL
Remove the upper cover. Remove the Main
disconnect
Carriage Motor leads. Remove two screws fastening
Carriage
from Carriage Motor pulley. Lift Carriage
Printer.
PAPER FEED MOTOR
Remove
two phillips screws fastening Paper Feed Motor
printer mechanism. Remove Paper
of
Printer.
Connector
Motor
to
upper case.
CN4. Cut the tie wraps securing
the bottom cover.
Remove carriage belt
REMOVAL
Remove Main Control Board.
ADJUSTMENTS
all
connectors
head
assembly.
frame
assembly.
cable to the right
two
screws holding
Printer.
bearing
ways from
out platen.
Control Board,
Motor
Remove
to left side
Feed Motor from
posi-
and
the
the
from
CHARACTER PRINTING
FIRST
Loosen screws
Turn motor
when
the
at the home sensor
stops
Figure 1. If changing position of motor
correct the print position, change the
carriage synchro-belt
of the
teeth.
fastening Carriage Motor to bottom
assembly
a
power is turned ON, the
1mm
POSITION ADJUSTMENT
little one way
print head returns and
position within tolerance, see
the pulley by one or two
on
-0.55-0. 75mm
Home
—I Sensor
ri
TjL-LI
CN10>-
'U
a
1
Figure
PRINTHEAD ADJUSTMENT
Print head adjustment
printer mechanism, carriage assembly
Loosen carriage shaft screws on the
mechanism. Move carriage shaft
gap between
0.5mm.
or the other
cover.
so
that
assembly does not
engagement position
DETECTOR
LEVER
platen and print head is between 0.45mm
PLATEN/PAPER
Remove the
screws. Adjust
paper separator
paper separator
should be
SEPARATOR
cover,
upper
clearance
the
approximately
for
screws,
see
PAPER
SEPARATOR
\
0APPROX
performed after repair of
frame, or print head.
sides of the printer
forward or backward until
and
ADJUSTMENT
loosen the
between
0.5mm.
2.
Figure
/
Figure 2
paper separator
the platen and the
Tighten the
14

LINE DEFINITIONS
THRU AD7 Address Bus, BitsOThru7
ADO
COMMAND
DATA IN
OUT Serial Port's Transmitted Data
DATA
P1.0THRUP1.6
5V READY
Serial Port's Receiver
Port 1 Bit Thru Port 1 Bit
Interrupt, Vectored
Input
to
Service Program
to
Counter
Data Input
6
15

IC PINOUTS &
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12
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FRONT VIEW
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PC4 PCS
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RESET
PCS P97
TIMER OUT
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A05 PAS
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AD7 PA1
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PB1
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