D. TROUBLESHOOTING ..................................... 14
1. Check Flows for Troubleshooting ................... 15
Figure 23. Printer is totally out of work ......... 15
Figure 24. Incorrect function of printer mechanism 16
Figure 25. Print is available, but incorrect
characters ............................. 17
Figure 26. Feed motor is not working .............. 18
2. Check Points for Repair ........................... 19
3. Typical Wave Form of Signals ...................... 23
E. PARTS LIST .......................................... 26
F. SERVICES FOR PRINTER MECHANISM ...................... 37
Page 5
G E N E R A L
Information for Repair annd Maintenance of PERIPHERAL PRINTER
Before starting repair and/or check of the printer by
referring to this information, the Operation Manual of the
Printer should be thoroughly read.
This manual includes all the technical information that is
necessary to be referred to for performance of service at the
distributor's service organization except for the subjects
that are covered by the Operation Manual.
A. MODULES AND COMPONENTS
Refer to the followings for the incexes of the descriptions
and locations of the parts (modules).
Figure 1.
External View
Figure 2.
External View on Back Side
-1-
Page 6
Figure 3. Internal Structure
-2-
Page 7
B. BASIC STRUCTURE
1. Power-Supply
Primary - AC 50/60Hz 100V, 115 V, 220 V or 240 V
Transformer for each AC voltage is selected at the
factory.
Note: There are four types of transformer. A
selection of voltage is made at the
factory-set in accordance with the customer's
requirements.
Secondary - DC 5 Volt for TTL Logics.
DC 19 Volt for Printer Mechanism.
2. CPU and Control Circuit Block
Main Control Board with CPU, ATARI SIO Interface
Board and Operation Key Board.
3. Printer Mechanism
Printer Head, Head Carriage Mechanism, Paper Feed
with Tractor Mechanism and Ribbon Driver Mechanism
are in unit.
The Printer head is replaceable but disassembling of
the other parts of unit at the field is not
recommended for repair. In case of the printer
mechanism is defective, the whole printer mechanism
unit should be replaced, and the defective one be
sent back to the factory.
Figure 4.
General Blocks of Structure
-3-
Page 8
4. Connection of Circuits, between Modules
Figure 6.
Please refer to the electric circuit diagram and
P.C.B. layouts.
4. Interface Outline
Connector Location, on Blocks:
Figure 7.
BI-DIRECTIONAL SERIAL
Interface Block Diagram
-4-
Page 9
5. ATARI SIO BUS Timing
The bus protocol specifies that all commands must
Originate from the CPU and that peripherals will present
data on the bus only when commanded to.
Figure 8.
Figure 9.
Data Send (to Printer)
Data Receive (from Printer)
-5-
Page 10
7. Functional Structure in Block Diagrams
Figure 10.
Figure 11. Basic Data Flow with the Host Computer
Basic Data Flow between the Hardwares
-6-
Page 11
8. XMM801 Timing chart at Power ON
Figure 12.
Timing Chart
-7-
Page 12
C. ELECTRIC CIRCUIT INFORMATION
Refer to Figure 6. for the connection between modules.
1. Power Supply (power supply assembly)
Figure 13.
Circuit Diagram 220/240 Volt type
Figure 14.
Circuit Diagram, 100/115 Volt type
-8-
Page 13
Figure 15. Parts Layout and Pattern Schematic for filter
P.C. Board
Figure 19. (cont.) Parts Layout and Pattern Schematic
-11a-
Page 17
4. ATARI SERIAL INPUT/OUTPUT INTERFACE BOARD
Figure 20.
ATARI SIO INTERFACE
Figure 21.
Parts Layout and Pattern Schematic
Circuit Diagram
-12-
Page 18
5. Electric Circuit for Printer Mechanism
Figure 22.
Connection Diagram
-13-
Page 19
D. TROUBLESHOOTING
If the printer fails to operate properly, please solve the
problem using this table.
SYMPTOM REFERENCE
Printer is totally out of
work. It does not operate when
Refer to CHECK FLOW, TROUBLE-1
Power switch is turned ON:
Incorrect function on Printer.
Motors are working but wrong.
Refer to CHECK FLOW, TROUBLE-2
Motor works only occasionally.
Incorrect print. Paper feed
and head carriage are OK and
Refer to CHECK FLOW, TROUBLE-3
print is available wrong
font/matrix.
Feed Motor does not work,
Every functions are ok but
Refer to CHECK FLOW, TROUBLE-4
does not feed paper.
Note: For description of CHECK POINT, REF. Numbers are shown
in the flow charts. Please refer to the Paragraph 2.
Check Points for Repair, to know which to be mainly
checked for repair service.
-14-
Page 20
Figure 23. TROUBLE-1 PRINTER IS TOTALLY OUT OF WORK
-15-
Page 21
Figure 24. TROUBLE-2 INCORRECT FUNCTION OF PRINTER MECHANISM
-16-
Page 22
Figure 25. TROUBLE-3 PRINT IS AVAILABLE BUT INCORRECT
CHARACTER
* CON 9,10:Male Connectors on Atari Serial Input/Output interface board
-17-
Page 23
Figure 26. TROUBLE-4 FEED MOTOR IS NOT WORKING
-18-
Page 24
2. Check Points for Repair
The followings are reflected to the markings on the check flow
charts on paragraph l.
In this description, there are the explanations as refer to
FIG. a,b,c,.... showing the tested wave form on scope that can
be compared with the same index in paragraph 3.”Typical wave
form of signals”.
When the checking operation is disturbed by the printer mechanism, it should be removed from the bottom case. The (-) leg
of Diode BD-1 is useful as GND terminal for testing.
REF.7-0 Check of Voltage on Power Supply. Printer is stopped.
Anode side of zener diode ZD1 should show the
voltage of DC 21V.
-The PIN 2 of regulator IC7 should show DC 5V ±5% (on
the main control board.
REF.7-1 Check Power Supply Circuits and Devices while the
printer is stopped.
-The "1" leg of IC-7, located left hand of heat sink
Should show the voltage of approx. DC 11V.
-The “E” leg of transistor T1 should show the voltage
of about DC 19V.
-The “E” leg of transistor T3 should show the voltage
of about DC 1V.
REF.7-2 Check of AC Voltage, while the printer is stopped.
Without the Host.
-Input of diode BD-1 should show the sine wave with
voltage range of approx. AC 23V.
-Between the anode of D3 and the cathode of D2, it
should show the sine wave with voltage range of
approx. AC 10V.
REF.7-3 Check for pulses at power-on reset time.
-Relation between "DC 5V" on Pin 63, 64 and "RESET" on
Pin 28 of CPU (7811) should show a the pulse wave,
refer to FIGURE s. at turning power switch on.
REF.7-4 Check "if software is running".
-Signal ALE, on Pin 46 of CPU (7811) 1 should show the
pulse ;nave, refer to FIG. a.
-Signal CE, Pin 20 ROM (2764) should show:
high level while the printer is stopped.
Pulse wave, refer to FIG. b-similar wave, while the
printer is running.
RFF.7-5 Check around main CPU (7811).
-Signal RD, on Pin 44 of main CPU (7811) should show
the pulse wave, refer to FIG. c, while the printer is
stopped.
-19-
Page 25
-Signal CLK, on Pin 31 of the main CPU (7811) should
show the wave, refer to FIG. d.
-Signal ALE, on pin 46 of main CPU (7811) should show
the pulse wave, refer to FIG.a.
-Signal WR, on Pin 45 of main CPU (7811) should show
the pulse wave, refer to FIG.e-similar wave, while the
printer is running.
It stays at High Level while the printer is stopped.
-Signals on Data and Address Bus, Pin 55 thru 62 of
main CPU (7811) should show the pulse wave, refer to
FIG.f-similar wave.
-Signals on ADDRESS BUS, Pin 47 thru 54 of CPU (7811)
should show the pulse wave, refer to FIG.g-similar
wave .
-Other pins on CPU (7811) should be as follows, under
Condition 1.
Pin No
LEVEL Pin No LEVEL Pin No LEVEL Pin No LEVEL
1 L 12 H 23 L 38 L
2 H 13 H 24 L 39 H
3 L 14 H 25 H 40 H
4 H 15 H 26 L 41 F
5 L 16 H 27 H(PLS) 42,43 H(+5V)
6 L 17 H 28 H 52 H(PLS)
7 H 18 L 29,32,33
L 53 H(PLS)
8 L 19 L 34 H 63,64 H
9 H 20 H 35 H
10 H 21 L 36 H
11 H 22 L 37 H
F: Floating
REF.7-6 Check around ROM (27128)
Check the Pin of CPU IC1 instead of the pin of ROM
-Signals on Address Bus, Pin 2 thru 10, 21 & 23-25 of
ROM (27128) should show the pulse wave, refer to
FIG.f-similar wave, while printer is running.
-Signals on Data Bus, Pin 11 thru 13 and 15 thru 19 of
ROM (27128) should show the pulse wave, refer to
FIG.f-similar wave, while printer is running.
-Other pins of ROM should be as follow, under condition
Pin No LEVEL Pin No LEVEL Pin No LEVEL
1 H(+5V) 14 L(GND) 27 H(+5V)
26 H(+5V) 20 PULSE 28 H(+5V)
-20-
Page 26
CONDITION 1 : While Printer is stopped after power on and home
positioning of Head and sound of Buzzer.
Without the Host and paper.
Al Dip Switches on Centronics Parallel Interface
Board are on.
REF.7-7 Check signals to the Carriage Motor.
-At power-on Time if Head is located at home position,
Pin 3,6,11,14 of IC6 should show just few pulses,
refer to FIG.h just few pulses then stop.
While the head is moving, this pulse remains.
REF.7-8 Check signals for the head which is at Home Position.
-Level on Pin 21 of CPU (7811) should be:
When Head is on home position -------- level low.
When Head is not on home position ---- level high.
REF.7-9 Check if the contents of ROM (27128) are correct.
-Replace the ROM and see the trouble has been solved.
-If no ROM for replacement, follow the next steps of
Flow Chart.
REF.7-10 Check on Carriage Driver Circuits.
Pin 2,7,10,15 of IC6 show the step motor drive pulses
refer to FIG.i.
REF.7-11 Check for Dot Strobe.
-While the head is moving by hand or by power, Pin 20
of CPU (7811) should show the pulse, refer to FIG.k.
-While the head is moving by hand or by power, leg of
R37 should show the pulse, refer to FIG.j.
CAUTION: Moving the head by hand should not be done
for long time, just few seconds only.
REF.7-12 Check for Printer Mechanism.
-If trouble is on head, replace it and test.
-If trouble is not on head, try to replace whole
printer mechanism, then check. Before replacing it,
see thoroughly the mechanism to see for any mechanical
damage.
NOTE: Repair of printer mechanism is not
recommendable.
Special service manual for mechanism repair
will be provided.
REF.7-13 The head should return to home position at power on
time, even so the head is originally located at home
position it should be moved to right and returned to
home position automatically at Power On.
REF.7-14 Test print should be done when the main power switch
Is turned on, while the LF switch is also pressed
down.
-21-
Page 27
REF.7-15 Check pin status on signal connector CON 9, 10
(Pin Assignment)
Pin 3. DATA INPUT (to Host Computer)
4. GND
5. DATA OUT (from Host Computer)
6. GND
7. COMMAND (from Host Computer)
Low when Host Computer is sending a
command frame to the printer
10. READY (from Host Computer)
High when Host Computer is ready.
Pin 1, 2, 8, 9, 11, 12, 13 not used by printer
-All 13 pins shall be daisy chained from one SIO
connector to the other, i.e. connect pin 1 to pin 1,
pin 2 to pin 2 and so on.
-For reference DATA IN, DATA OUT and COMMAND should
Show the pulse wave, refer to FIG.l,m while printing.
REF.7-16 Check Print Signal on CPU (7811).
-While printing, Pin 9 thru 16 should show pulse wave,
refer to FIG. n-similar wave.
Pulse width is typically 600sec.
REF.7-17 Check Print signals on the driver.
-Connect plus lead of scope to Anode side of Diode ZD4
then check following points by minus leadoff scope:
Pin 7, 2, 15, 10 (IC3) 7, 2, 15, 10 (IC4) should
show pulse wave refer to FIG.o-similar wave.
CAUTION: For this check, the scope should be floating
from GND.
REF.7-18 Check paper feed signals.
-Some 2pins in Pin 4 thru 7 of IC5 should show High
level, other 2 pins should show Low level when not
feeding paper, and in paper feeding should show pulse,
refer to FIG.q-similar wave.
REF.7-19 Check circuits for Paper Feed Motor, in feeding.
Check pin 10 thru 13 of IC5 while paper feeding and
refer to FIG.r-similar wave.
-22-
Page 28
3. Typical Wave Form of Signals
2V/DIV 500nS/DIV 2V/DIV 5S/DIV
FIG.a ALE SIGNAL FIG.b AB15(2764) SIGNAL
2V/DIV 1S/DIV 200mV/DIV 50nS/DIV
FIG.c RD SIGNAL FIG.d CLOCK SIGNAL (7811)
200mV/DIV 200nS/DIV 200mV/DIV 1S/DIV
FIG.e WR SIGNAL FIG.f DATA & ADDR BUS SIGNAL
-23-
Page 29
200mV/DIV 1S/DIV 200mV/DIV 2mS/DIV
FIG.g ADDRESS BUS SIGNAL FIG.h CARRIAGE SIGNAL
2V/DIV 2mS/DIV 200mV/DIV 1mS/DIV
FIG.i CARRIAGE MOTOR FIG.j,k DOT STROBE
200mV/2V 2mS/DIV 200mV/2V 500S/DIV
FIG.l,m DATA IN SIGNAL FIG.l,m DATA OUT SIGNAL
-24-
Page 30
200mV/DIV 2mS/DIV 1V/DIV 2mS/DIV
FIG.n PRINT SIGNAL FIG.o PRINT DRIVER
200mV/DIV 5S/DIV 200mV/DIV 10mS/DIV
FIG.p I/O M SIGNAL FIG.q PAPER FEED SIGNAL
1V/DIV 5mS/DIV 200mV/2V 10mS/DIV
FIG.r FEED MOTOR DRIVER FIG.s +5V and RESET(8155)
-25-
Page 31
E. PARTS LIST
The codes on the column of INDEX on the list are the guide to
locate the parts on the exploded view drawing included in this
paragraph.
To locate the electric and/or electronic parts on the boards,
see the markings on the column of INDEX referred to in the
schematics in Paragraph C. ELECTRIC CIRCUIT INFORMATION.
NOTE: For repair of the boards, the locally available
equivalents (in specifications) of the electronic devices can
be used.
P A R T S L I S T
INDEX PART NUMBER DESCRIPTION Q’TY
MAIN P.C.BOARD ASS'Y (7811-B)
1-1 XMM8-B32AM Main P.C.Board, 1.6t HB Material 1
Paper Phenol Resin
LSI1 L-uD7811 CPU, uPD7811 1
ROM1 RO-2764 ROM, 2764 (X801.1D) 1
IC1 I-74LS373 IC, 74LS373P 1
IC2 I-74LS14 IC, 74LS14 (or 74HC14) 1
IC3,4 I-M54567 IC, M54567P or M5248P 3
6
IC5 I-M54523 IC, M454523P or Equivalent 1
IC7 I-7805 IC, 7805 (3-Terminal Regulator) 1
T4,7 TR-2SA844 Transistor, 2SA844 2
T5,6 TR-2SC2308 Transistor, 2SC2308 2
T1,3 TR-2SD1392 Transistor, 2SD1392 (2SD1595) 2
(with Mylar Sheet)
T2 TR-2SB794 Transistor, 2SB794 1
X-C7.37M Ceramic Resonator. 7.37MHz 1
R33,34 R-333J25CH Resistor, 33k 1/4W ±5% 2
R25 R-473J25CH Resistor, 47k 1/4W ±5% 1
R20 R-181J25CH Resistor, 180 1/4W ±5% 1
R18,19 R-471J25CH Resistor, 470 1/4W ±5% 2
R23,31 R-102J25CH Resistor, 100 1/4W ±5% 2
R8,9 R-103J25CH Resistor, 10k 1/~~I~J ±5% 8
11~13
16,17
28
R21,27 R-472J25CH Resistor, 4k7 1/4W ±5% 3
32 NOTE : We change rate value of R29 (220->100) in order
to common use IC M54547P and M5248P (Index No.
IC 3,4,6).
XMM8-A010 Individual Box 1
XMM8-A020 Master Carton 1/2
XMM8-A030 Styrofoam Packing Set l
XMM8-A040 Vinyl Bag (for Body Unit) 1
VP80-A070 Head Fixer 1
XMM8-A060 Vinyl Bag (for 13P Connector Cable) 1
-33-
Page 39
-34-
Page 40
-35-
Page 41
-36-
Page 42
F. SERVICES FOR PRINTER MECHANISM
The service instructions as described below are usefull for
repairing in field and checking the performance of used
Printer Mechanism.
Before starting adjustments and replacements for printer
mechanism, following materials, tools and gauges should be
prepared.
a. Materials
Material Name Parts Remarks
Adhesive Loctite® Screw Adhesive over ¼ of screw
head and washer
Grease Beacon 325 Special
Alcohole General purpose for
cleaning
Solder 62Sn48Zn With flux
b. Tools
Solder Iron
Disconnection and
connection of
15 ~ 17 Watt
wiring
Screw Drivers
Small
Medium
Screw
Screw
+ bit for M2 ~ M2.6
+ bit for M3 ~ M5
c. Gauges
Thickness Gauge 0.05mm
0.15mm
Paper &
sensor
Available car use
0.5mm
0.5mm
Tension Gauge Synchronous
0 ~ 500G
Belt
-37-
Page 43
I 3
1. Adjustment & Replacement of the printer head
1-1 Disassemble and assemble
1) Remove two M3 Head Screws
2) Take out the Flexible cable from connector
3) In case of assembling, Do reverse way of 2), 1)
1-2 Adjustment of the Head (after assembling)
1) Loose two M3 Head Screws
2) Insert the H.35mm thickness gauge between Ribbon
Guide and Head Nose.
With keeping this gap, fix two M3 Head Screws.
-38-
Page 44
3) Check the gap between Ribbon Guide and Head Nose
again, by inserting above thickness gauge.
The gauge should be inserted smoothly. If not,
back to 2.
2. Adjustment & Replacement of Ribbon Gear Ass'y
2-1 Disassemble and assemble
1) Remove three screws which fix the Ribbon Gear
Assy on the chassis as M2.5 x 6
2) Take out the synchronous belt from Ribbon Gear
Ass'y
3) In Case of Assembling, Do revese way of 2), 1)
But, Don't fix three screw completely, keep a
little bit loose for adjustment of tension of
synchronous Belt
2-2 Adjustment and Lubrication
2-2-1 Lubrication
•Lubrication for Ribbon Gear Ass'y shuld be done
before assembling on the chassis.
•Lubricate the grease (Beacon 325) to the
meshing part of the gears.
•After lubricate, check the gears rotate smoothly
and no eccentricaly.
2-2-2 Adjustment of Tension of Synchronous Belt
• Move the Printer Head to the right end
print Head
-39-
Page 45
• Check the three screws which fix Ribbon Gear
Ass'y on the chassis are slightly loosed.
• Push the middle of Synchronous Belt by Tension
gauge until slightly touching to other side of
Synchronous Belt, and check the tensions within
250g ~ 300g.
If not within the specified value, adjust the
location of Ribbon Gear Ass'y.
• Then, fix the three screws firmly.
3. Replacement and Adjustment of Carriage Motor Ass'y
3-1 Disassemble and Assemble
1) Remove the Connector CON 6, 8 (Connected from
Carriage Motor) from Main P.C.B Assembly.
2) Take out the three M3x6 screws which fix the
Carriage Motor Aassembly.
-40-
Page 46
3) In case of assembling, Do reverse way of 2), 1)
3-2 Adjustment of Carriage Motor Assembly
1) Check the backrash of the mesh part between
pinion gear of the carriage motor and right
pulley by jogging horizontally the Printer Head,
and adjust the carriage motor so sightly that
backrash way not make even with minor force.
2) Fix four M3x6 screws firmly.
3) After above process, check once again the
backrash is minor enough and Printer Head can
move smoothly.
3-3 Lubrication for Carriage Motor Ass'y.
Specified grease (Beacon 325) is required to
the mesh part of pinion gear of Carriage Motor
and the Upper gear of Right Pulley.
-41-
Page 47
4. Adjustment and Replacement of Home position Switch Ass'y
4-1 Disassemble and Assemble
1) Remove the M2.5x6 screw which fix the Home
position Switch Ass'y to the chassis.
2) Resold the lead wires from Home position Switch
terminals.
3) In case of assembling, do reverse way of 2), 1).
4-2 Adjustment of the Home position Switch
1) Lose slightly the M2.5x6 screw which fix the Home
position Switch Ass'y to the chassis as possible
to move by finger.
2) Insert the 10 inches width paper and print out.
Check the left end of the printed charactor must
be located at 25.6 ±0.5mm from left end of paper.
3) If not with in the specified area, adjust the
location of Home position Switch Ass'y and fix
the M2.5x6 screws
-42-
Page 48
4) After fix the M2.5x6 screw firmly, check once
more the location of left end of printed
character which is within the specification.
5. Replacement and Adjustment of paper End Sensor
5-1 Disassemble and assemble
1) Take out the Leaf Switch Ass'y and M2.3x5 screw
by loosing the screw as shown below.
2) P-G Lever also is removed accordingly with the
Leaf Switch Ass'y.
3) Resolder the lead wires from Leaf Switch
terminal.
4) In case of assembling, do reverse way of 3), 2),
1).
5-2 Adjustment of Paper End Sensor
1) With holding the P-G Lever against the Platain,
check the gap between P-G Lever and the tip of
Leaf Switch which is within 0.05~0.15mm by
inserting Thickness Gauge.
And if not, adjust the Leaf Switch Ass'y, then
fix the M2.3x6 screw firmly.
-43-
Page 49
2) Insert the paper to print out and check the gap
of the contact points of the Leaf Switch shall be
more than 0.5mm (measured with thickness gauge).
6. Replacement of F.P.C Ass'y
1) Remove the Flexible Cable of the Printer Head from
F.P.C cable Ass'y on Printer Head Holder.
2) Remove two M2.5x6 screws, and take out the F.P.C Cable
Ass'y from the Printer Head Holder.
3) Resolder the F.P.C Cable from the Connection P.C.B
F.P.C Cable
4) In case assembling, Do reverse of 3), 2), 1)
-44-
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