Commodore MPS-803 Service Manual

CONTENTS

CHAPTER 1 SPECIFICATIONS................................................................ 1-1

I. Application.................................................................... 1—2

II. General feature 1—2
III. Structure 1—2

IV. Basic specifications........................................................ 1—3

V. General specifications

...................................................

1—4

VI. Functional specifications

..............................................

1—5

VII. Interface specifications................................................. 1—11

CHAPTER 2 OPERATION

.........................................................................

2-1

I. Precautions.................................................................... 2—2

II. Parts identification........................................................ 2—3

III. Operating functions ...................................................... 2—4

IV. Setting u p

..........

’. .......................................................... 2—6

CHAPTER 3 OPERATING PRINCIPLE.................................................... 3-1

I. Operating principle........................................................ 3—2

II. Operating of the electronic p arts

..................................

3—6

CHAPTER 4 MAINTENANCE..........................................................................4-1

I. Notes for the maintenance

............................................

4—2
II. Disassembly, replacement and

adjustment of parts........................................................ 4—3

III. Lubrication.................................................................... 4—17

CHAPTER 5 CIRCUIT DIAGRAMS ......................................................... 5-1

CHAPTER 6 PACKAGE DRAWINGS

..................................

6-1

CHAPTER 7 TROUBLESHOOTING

........................................................

7-1

1-1

CHAPTER 1

SPECIFICATIONS

1-2

I. Application

This Service Manual contains the service information of
Commodore personal computer printer model MPS-803.

II. General feature

This is a bi-directional printer of dot impact system

using 8 vertical dots, capable of printing 60 cps.

III. Structure

PRINTER CONTROL SECTION OPERATION PANEL SECTION

This printer is comprised of the printer control, printer
mechanical, operation panel and power supply sections.

1-3

IV. Basic specifications

1. Printing method.

2. Head

...........

3. Print characters

4. Kinds of marks

5. Character code

........

6. Standard character size

7. Dot size

..............

8. Print speed

...........

9. Printing directions....

Mark printing.....

10. Max number of columns..

11. Character pitch

.......

12. Line pitches

..........

13. Line feed speed

.......

14. Paper feed method

.....

15. Ink ribbon...

.........

16. Print paper

...........

Dot matrix impact system

8-pin type

Alphabets in capital and

small letters, Arabic
numerals, symbols and
graphic elements
Random combination in
vertical and horizontal
directions of vertical 7-dot
units.
COMMODORE 8-bit code
Vertical 7 dots (2.4mm)
Horizontal 5 dots (2.0mm)

0.3mm (wire diameter)
Horizontal pitch...1/60 inch
Vertical pitch

....

1/72 inch
60 cps
Bi-directional shortest
distance printing
Uni-directional shortest
distance printing

(rightwards)
80 columns
10 cpi
6 or 8 lpi (switch selectable)
72/7 lpi...mark printing
4 lps

....

character printing

(6 lpi)

5.6 lps...mark printing
Friction feed or Pin feed

(optional)

Cassette type fabric ribbon

width: 8mm

length: 10m
color: black
life: approx. 500,000
characters (ANK)

Cut paper

A4 210.8mm (8.3 inches)

letter 216.0mm (8.5 inches)
Paper quality: fine
Regular paper: 45-60 kg/ream

Transfer paper...

34kg/ream x 3

(chemical carbon paper)

Continuous paper (option)

101.6mm (4.0 inches)
254mm (10.0 inches)

Paper quality: fine
Regular paper...45-60kg/ream
Transfer paper..

34kg/ream x 3

(point- or line-pasted paper

only)

(chemical carbon paper)

1-4

17. Copying capability

...........

original copy + 2 pieces

18. Detection functions
a. Home Position and Paper Empty switches

HOME POSITION SW: .Left end detection

.Printing starts of 24th pulse(dot)

after this SW is turned OFF.

.Detecting this SW during printing

puts the printer in ERROR mode, and
printing stops.

(LINE RELEASE)

b. PAPER EMPTY SW: .Paper empty detection

Turns ON after 3 lines from
mechanical detection.

19. Operational switching
Paper feed: Except mark print mode, either of 1/6 or 1/8
inch feed shall be selected.

Listener address: Shall be switched to 4 or 5.

20. Operation section
(1) SWITCH PANEL
(l).l POWER LAMP (red)

a. POWER indication and PE indication.
b. Flickers for PE detection, (at data input)
c. Flickers when MOTOR ERROR.

(1).2 LF SW

a. Has the MANUAL LF function when data is not input.
b. Has the PE CANCEL function.
c. Has the TEST PRINT START function.

V. General specifications

1. Power

....

1.1 Input
AC 100V/117V +10% 50Hz.60Hz (+2%)
AC 220V/240V +10% 50Hz.60Hz (+2%)

1.2 Output
+5V +5% (AC input + 10%)
+24V +4V (AC input + 10% test print)

2. Temperature and humidity requirements in operation

.........

temperature 5°C - 40°C

humidity 10% - 80%
Wet-bulb:MAX 27°c No dew allowed.

3. Rush-in current

.........

20A or less at rated voltage and

frequency.

4. Leak current

............

1mA or less.

5. Power consumption

.......

25W or less at test printing at

rated voltage and frequency.

6. Insulation resistance.... across AC - FG 500V

50M£2 and over

7. Insulating strength

.....

across AC - FG

No abnormality shall occur after
applying 1000V AC for one minute.

8. External dimensions

.....

334 (W) x 206 (D) x 94 (H) mm

Refer to the Exterior Drawing

9. Weight

..................

3 kg (approx.)

10. Noise

...................

63dB or lower

(in rolling ASCII printing)
(when measured by A-SLOW at lm

away horizontally from the front

face.)

1

20,000,000 characters and over

(ANK printing)

MTBF 4,000 hours....excluding

head life

Conditions:

Duty for POWER ON time: 20%

Duty for characters: 25%
Line feed accuracy 4.23 + 1.0

(1/6 inch feed)

Accumulative line feed accuracy

42.33 + 1.5
(10 lines, 1/6 inch feed)

Column alignment accuracy 0.4 or

less

Accumulative column alignment

accuracy ( 10 lines) 1.0 or less

Line inclination 1.5 or less

letter paper

(when measured across the first
and last characters) 0.7 or less
fanfold paper

(inclination to the sprocket

holes)

VI. Functional specifications (ROM REVISION U32053A)

1. Principal functions
(a) Double-width character output possible by command

designation.

(b) Mark printing possible. (BIT IMAGE output)

(c) In mark printing, repetition possible by instruction.
(d) Print start position can be designated by character or

dot. (POSITIONING)

(e) Standard characters, double-width characters and marks can

be mix-printed in one line.

(f) Automatic printing when BUFFER FULL or OVER PRINT

possible.
(g) Print function self-checking program equipped.
(h) Reversal printing possible by command designation.
(i) From (") X' 22' to (") or CR code,

X' 00' - X' IF' and X' 80' - '9F' output
the reversal characters of X' 40' - X' 5F' and X' CO' - X'
DF' respectively.
Note that CR code always executes carriage return.

2. Print modes
(a) STANDARD CHR PRINT mode: bi-directional
(b) DOUBLE-WIDTH CHR PRINT mode: bi-directional
(c) MARK PRINT mode: uni-directional

Reversal print is uni-directional to avoid damaging the
print head.
For the character font, either of GRAPHIC (SA=0) or
BUSINESS (SA=7) mode can be designated by the secondary
address.

11. Head service life

12. Durability

......

13. Print quality....

1-6

3. Interface specifications
COMMODORE serial interface
CON LINE range: from LISTENER ADDRESS reception to UNL

reception)
Refer to the INTERFACE SPECIFICATIONS.

4. Function codes

(a) NL (X' OA')

Print command. Executes line feed after printing. Same
as LF if used singly. Does not cancel PRINT mode.

Cancels RVS ON.

(b) CR (X’ OD')

Print command. Executes line feed after printing. Same
as LF if used singly. Does not cancel PRINT mode.
Cancels RVS ON and X' 22' (") function.

(c) BS (X' 08')

Designation command for MARK PRINT mode. Executes MARK
PRINT mode after BS to SI or SO. POS and ESC-POS
designation right before BS input are invalid.
Valid status codes between BS and SI or SO are BS, POS,
ESC-POS, SUB, NL and CR.

MARK PRINT remains designated for the following line if NL

or CR is valid.
If 8th bit of the MARK data is "1” or "0", the data works
as function code.

(d) SO (X' OE')

Designation command for DOUBLE-WIDTH CHR PRINT mode.
This mode is valid after SO to SI or BS.

POS and ESC-POS designation right before SO input are
invalid.

Valid function codes between SO and SI or BS are SO, POS,
ESC-POS, GRAPH, BUSINESS, RVS ON, RVS OFF, NL and CR.

This mode remains designated for the following line if NL

or CR is valid.

(e) SI (X' OF')

Designation command for STANDARD CHR PRINT mode.
Use this print mode right after turning on the power.

This print mode is valid after SI to SO or BS.

POS and ESC-POS designation right before SI input are

invalid.
Valid function codes between SI and SO or BS are SI, POS,
ESC-POS, GRAPH, BUSINESS, RVS ON, RVS OFF, NL and CR.
This print mode remains designated for the following line

if NL or CR is valid.

1-7

(f) POS (X' 10') POS"ab" ab is a 2-digit numeric code.

Designation of print start position.

Absolute position designation by standard character size.

ab£80 is invalid.

If numeric code is not used,
position designation is not

guaranteed.

N
L

Print executed at 40th and 41st columns
counted from 0 with standard character size.

2 columns of double-width character

In the example above, if 79 replaces 40, this designation
results in overprint. Automatic line feed is done and
printing is done at 0 and 1st columns, and line feed is
done.
Basically, printing data exceeds the printing range, OVER
PRINT occurs due to this designation and automatic line

feed is performed. Characters exceed including the END
point are printed at the head of the following line.
If this designation is continued, only the last value is

valid.

(g) ESC (X’ IB') ESC-POS-HP-LP

Designation for print start position.
Absolute position designation by dot.

0 1 2

Example

S

0

79

P

0

S 40

0 1 2 3 4 7 9

HP * X X
LP = P 8 P 7

Position = 0 0

X X

P 6 P 5

i

0 0

X X
P 4 P 3

0 0

HP.LP£480 is invalid.

P9

P 2 PI

P 9

..................

PI

Printing of standard and double-width characters after
designating 479SHP.LPS475 is automatic and done at the

head of the following line including line feed.
Double-width characters after designating 479£HP.LP£469
are processed in the same way.
If this designation is continued, only the last value is

valid. Only POS can be combined with ESC, print output

except POS is not guaranteed.

1-8

(h) SUB (X* 1A') SUB.n.data(£128)

Repetitive designation command for MARK data.

This command is valid in the MARK PRINT mode, and SUB code

(1BYTE) is ignored in the STANDARD CHR and DOUBLE-WIDTH

CHR PRINT mode.

255in£0 If 0 is set, it is considered as 256.

exp.

S N

I A L

40 CHRS

0 239

ABC

B

S

S

U

B

D
A
T

As described in the position designation, standard and

double-width characters after designating

(479-239)£n2(475-239) are printed at the head of the

following line including automatic printing and line feed.

Double-width characters after designating

(479-239)2n£(469-239) are processed in the same way.

If data value of this command is smaller than 128, the
whole designation is ignored.
When data of this command exceeds the printing range,
printing proceeds and starts from the head of the

following line including line feed.

(i) GRAPH (X' 91')

GRAPHIC mode designation command

(j) BUSINESS (X* 11')

BUSINESS mode designation command
The above two commands are used to change the character

font.
This command is cancelled by the print command (CR, LF).

(k) RVS ON (X’ 12')

REVERSE designation command

(l) RVS OFF (X' 92’)

REVERSE cancel command
The above two functions are valid in the STANDARD and
DOUBLE-WIDTH CHR PRINT modes.
The designation command is cancelled by the print command

(CR, LF).

The above (i) (j) (k) (1) are not cancelled by automatic

line feed.

°- Undefined codes are ignored.
Those codes except POS, ESC-POS, SUB, NL and CR in the
MARK PRINT mode are ignored.

1-9

5. Reversal printing by ASCII (") X' 22'
X' 22' -X' 22' in STANDARD and DOUBLEO-WIDTH CHR PRINT

inodes or X' 00' - X' IF' and X' 80' - X' 9F' between CR

codes do not have their function and output the reverse
character of X' 40' - X' 5F' and X' CO - X' DF'
respectively.

CR code always performs carriage return.
Therefore, reverse of M is not possible by this function.
Ordinary character codes follow RVS ON/OFF.

RVS X’ 22’ or
OFF

RVS
ON

X’ 22 X' 01’ X* 02’ A B X’ 03’ X* 04’ X’ OD’

RVS NON-RVS RVS CANCEL

RVS, (") function is solely cancelled.

X’ 22 X’ or X* 02’ A B

I

___________________

I u

RVS RVS

X’ 03’ X* 04’

RVS

X* 22’

(or X* OD’)

A

(") function and RVS ON are cancelled together. Not

cancelled by AUTO PRINT LINE FEED.

6. Secondary address
Secondary address is designated by n3 among OPEN, nl, n2
and n3.
Sent to the printer right after the listener address.
Secondary address is often omitted.

(a) Secondary address = 0 GRAPHIC mode
(b) " = 7 BUSINESS mode
(c) when omitted GRAPHIC mode

(d) when other than 0 or 7 •* Invalid

This function is valid in one ON LINE range, and is

switchable by X' 91', X ! 11'. If switched by X' 91', X'
11°, it is cancelled by PRINT COMMAND (CR, LF).

The data sent to the printer is secondary address + X'

60' .

7. Listener address
Listener address is selected to 4 or 5 by the switch on
the logic card.
The data sent to the printer is listener address + X' 20'.

8 . Paper feed function

Paper feed is executed by LF, CR and line feed after
printing.
Length of feed differs with the mode before.

STANDARD, DOUBLE-WIDTH CHR PRINT mode 1/6 inch*
MARK PRINT mode -*»7/72 inch

* Can select 1/6 or 1/8 by the switch on the logic card.

Feed by MANUAL switch is valid in OFF LINE mode.

Feed length follows the print mode right before UNL.

1-10

9. Function codes are valid within the ON LINE range and the
function setting, set value and data are held even in the
OFF LINE mode.

Note that GRAPH/BUSINESS mode follows the secondary

address at OPEN. If the same secondary address is
received when previously set by X' 91', X' 11' and when a
print command (CR, LF) is not received, mode setting by X'
91', X' 11' is held. If different secondary address is
received, the mode follows the secondary address.

10. Paper empty detection
® OFF LINE: Data is taken in. BUSY status turns on at the

start of mechanical operation. At this time, PE detection

works and the POWER LAMP flickers. (at data input)

CLOCK

DATA

FLICKER

® ON LINE: Detection occurs at data input. POWER LAMP

flickers. BUSY at the LAST data is valid.
* PE detection occurs at 3 lines after mechanical
detection.

11. COMMODORE Serial Interface
. See Timing and Flow charts.
. See the Specifications for connectors and layout.

12. Automatic printing function

Two types are available.

(1) Print by data buffer full

At the end of printing, the dot position holds the

last dot point.
This is due to the control means, and there is no
difference between the input data and print output.
In this case, printing is uni-directional in any

mode.

1-11

(2) When the data exceeds the print range.

When the data exceeds the print range, printing is
executed to the last column followed by a line feed.
Excess data is printed from the head of the following

line.

(Printing not started at the input of 480 columns.)

If data exceeds the margin point, auto line feed is

executed and the excess data is printed on the

following line.

Reference: buffer size 152 BYTE

Number of bytes contained
POS: 4 SUB: 4
SI . SO . BS . NL . CR . RVS . GRAPH/BUSINESS: 1

13. Switch panel
(1) LF SW

(a) During OFF LINE, paper feed is executed without
regard to the paper.
Continuous LF is executed by pressing it for over 0.5 sec.

(b) If once after the PE detection occurs, load the paper
and press this switch to cancel the PE detection.

(Paper feed is not done.)

(c) This switch is invalid during ON LINE.
Still it has the function to cancel PE until the first
print command and buffer full. Invalid after this until
UNL.

(d) Turn the power on while pressing this switch to start
automatic self printing.

(2) POWER LAMP

(a) Comes on when power is input.
(b) Flickers upon PE detection until it is cancelled.
(2.5 times/sec)
(c) Flickers upon the motor error. (10 times/sec)

14. Self diagnosis
(a) At POWER ON

If CPU operation is correct, the carriage moves to left

(HOME POSITION) and then to the center to stop.

(b) POWER ON while pressing LF SW

Self printing starts.

Performs function check excluding the interface. During

self printing, manual line feed is invalid. Turn power

off to cancel the self diagnosis function.

VII. Interface specifications

1. Input connector (TCS4460-01-1011: Hoshi Elec. K. K.)

P IN NO.

SIGNAL

1

SERIAL SRQ

/s J J

1(2 ¡q 2

2

GND

3

SERIAL ATN

J /

4

SERIAL CLK

5

SERIAL DATA

6

RESET

1-12

2. Electrical requirements
Other requirements: refer to the circuit diagram.

LOW level 0.4 (V) or lower

Other requirements: refer to the circuit diagram.

3. INTERFACE CIRCUIT DIAGRAM

ATN

DATA

OV(GND)

CLOCK

RES

F.B .: FERRITE BEADS
CPU : yPD7811 (NEC)

1-13

4. Interface functions
a. Listener function directly connected by cable to CBM

serial bus.(SRQ, CLK and ATN signals are not controlled
by this device.)

b. Listener address can be set to 4 or 5 by switch.

Listener address 4: reception data 24 (hexadecimal)
Listener address 5: reception data 25 (hexadecimal)

c. Secondary address (SA) can be set to 0 or 7.

SA = 0 (reception data 60): GRAPHIC mode
SA =* 7 (reception data 67) : BUSINESS mode

d. Data input to this device does not finish until the

BUSY status inside this device goes off.

e. If this device turns into the ERROR status due to a

disorder within this device.
Response to the bus is not executed at all.

4.1 CBM serial interface

a. Data structure

LISTENER ADDRESS (SA)

DATA LAST DATA

UNL

ATN

E0I-HANDSHAKE

SYSTEM

LINE-RELEASE

(1) Data is processed by synchronous transfer with CLOCK.
(2) The first bit is the LSB. All the bits are of 8-bit

construction.
(3) Listener address data is X' 24 or X' 25. (4 or 5)
(4) SA is X' 60' or X' 67'. X' 60' is used when SA is

omitted. (SA is 0, 7)

(5) If address is not identified.

SYSTEM LINE-RELEASE is executed.

DATA I

60 ■

80 us

TPR

1

---

SYSTEM LINE-RELEASE

REFERENCE

CLOCK

Data sampling at rising

1-14

5. Program general flow
(This flowchart is not precise. Shows the conception of

data flow.)

INITIALIZE ROUTINE DATA RECEPTION & MAIN ROUTINE

DATA RECEPTION ROUTINE

1-15

LF SW INTERRUPT

DATA PROCESSING ROUTINE

TO THE PRINT ROUTINE

PRINT ROUTINE

1—16

c

PRINT INTERRUPT

)

YES

MOTOR ERROR

4 LF

___

1 LINE

FLAG

CLEAR

PRINT DATA

READ IN

MSB CLEAR

HEAD DATA OUTPUT

HEAD

i ON

PULSE WIDTH TIMER

SETTING

'HEAD OFF

HEAD DATA CLEAR

RETURN

TO THE MAIN ROUTINE

0

1

2

•*>

j

4

5

6

7

8

9

A

B

C

D

E

F

1-17

5INESS MODE

o

1

2

3

4

5

6

7

8

9

A

B

C

1-18

272

S

2-1

CHAPTER 2
OPERATION

2-2

I. Precautions

1. Wait at least two seconds to turn on the power after
it is turned off, otherwise the Printer will not be
initialized properly.

2. Never place the Printer where it is exposed to direct
sunlight.

3. Never apply power while you are plugging in or

unplugging an input connector.

4. Never turn off the power while the Printer is in

motion.

5. Never try to move the print head manually, whether

the power is on or off.

6. Do not stop the print head motion while it is

printing.

7. Do not print without paper and/or ribbon because the

print head might be damaged.

8. Turn off the power quickly and remove a foreign

object, if you drop it into the printer.

9. Do not subject the Printer to temperatures below 5°C

or above 40°C during operations, or to a sudden
change in temperature.

10. Regarding printing duty:

In graphic mode, using patterns with too much dot
density will wear out the print head faster. We
recommend that you use patterns whose dot density is
equal to that of ordinary alphanumerics. The
continuous printing of high dot density patterns may
adversely affect the longevity of the print head.

11. Unplug the power cord before trying to take off the

outer casing.

12. Do not turn ON/OFF your printer while the system is

in operation.

2-3

II. Parts identification

Shown below are the names of parts of the printer.

Platen Knob

Power Cord

Back View

rd *

2-4

III. Operating functions

1. Power Switch Turns printer ON and OFF

2. Paper Release Lever Releases paper in order to
adjust paper in right

position.

3. Platen Knob Once you have properly
threaded the paper, you can
use the Paper Feed Knob to

move the paper (both forward

and backward directions).

4. Switch Panel

Power
Indicator

a. Paper Advance Switch

b . Power Indicator

5. I/O connectors

Use this switch to move
paper ahead, 1 line at a
time, in the forward
direction only.
And self-printing starts
when power is turned on with
this switch depressed.
Lights up when printer is
turned on.
These jacks are used to
connect your Printer to the
computer. Use the Serial

Interface cable supplied

with Printer. Refer to
Section 10 for complete
connection instructions.

a-1 The Connector

Pin No.

1

2

3
4

5
6

Signal
SERIAL SRQ
GND
SERIAL ATN
SERIAL CLK
SERIAL DATA
RESET

2 The Interface

Plug the serial interface cable with your Printer
into the Serial Bus cpnnector for the connection.
Refer to Section 10 for details on how to connect
your Printer to your computer.

When the printer is printing, no data will be

transferred from the computer (the data line is said
to be low). When the printer is at rest, data can be
transferred from the computer (the data line is said
high).

When a printer error occurs, all control circuits

inside the Printer will stop.

2-5

6. Line Feed Select Switch

Use this switch to select
the line feed

8 : 1/8”

6 : 1/6"

LPI

m y

6 8

7. Device Selector Switch Select the device number 4.

DEVICE

I mp I

4 5“

8.

Power Cord Use the power cord supplied

with your Printer.

9.

Name Plate

This plate describes Model
Name required power source

voltage, and acquired

standards.

10. Connecting the Printer to Your Computer
To connect your printer to your Commodore computer
C64, please follow the figures below.

Your printer has two interface connectors. Please use

either of them.

Printer Rear Panel

2-6

IV. Setting up

Follow the procedures below to set up the printer.

1. Installing the ribbon cassette.
a. Take out the ribbon cassette from the box.

Turn the ribbon advance knob into the direction of

arrow to stretch the ribbon.

Ribbon

Claw

Ribbon Guide

Ribbon Advance Knob

b. Remove the top cover.

Lift both side ends and pull into the direction of
arrow.

c. Slip the ribbon in between the carriage and print

head. Install the cassette to the printer.

(Note) Make sure the ribbon is not twisted.

Ribbon

Ribbon

Advance Knob

Ribbon

Stopper

Ribbon Guide

Ribbon Cassette

2-7

d. Hook the ribbon on the ribbon stopper and pull right

the ribbon guide slowly and horizontally and fix it
to the printer body.

Ribbon Guide

e. Turn the knob into the direction of arrow to stretch

the ribbon.

(Note) Make sure the top end of the ribbon is

engaged in the ribbon stopper.

f. Attach the top cover.

2-8

2. Loading the paper

(1) Cut sheet loading

a. Push the paper release lever to OPEN.

b. Insert the paper into the direction of arrow.

c. Pull the paper release lever into the direction of

arrow.

d. Turn the platen knob as shown until the paper comes

out from the window cover.

2-9

e. Push the paper release lever to OPEN.

Hold the paper and make the edges parallel.
Then set paper release lever to the closed position.

f. Turn backward the platen knob and set the paper to

the print start position.

2-10

(2) Tractor unit (optional)

a. Remove the top cover. Remove the cover caps by

pulling them frontward.

b. Insert the front hooks of the tractor unit into the

holes located at the upper end of the top cover and
securely fix the unit onto the platen shaft. Engage
the rear hooks with the holes on the back of the

printer.

Tractor Unit

Rear Hook Hole

2-11

c. Insert the fanfold paper into the paper loading slit.

Turn the platen knob and feed the paper.

d. Adjust the sprocket position to fit the paper width.

If the sprocket pins do not engage with the sprocket
holes, move the paper holder to fit. Put down the
paper holder cover and push the paper release lever
to OPEN.

e. Turn the platen knob and set the paper to the print

start position.

Note 1) After the paper setting, press the paper advance

key and feed the paper for one line.

(This is to avoid irregular spacing between the 1st and

2nd lines.)
Note 2) Always set the paper release lever to OPEN.
Set the lever to CLOSE when the tractor unit is not
provided.

2-12

3. Performing the Printer Power On Test
You are now ready to proceed with the power-on part of the
checkout.

(1) Turn on the AC power to your computer and verify that

is working correctly.

(2) To turn on the power to the printer, press the rocker

switch at the side of the printer so that the white
dot is visible. In response to the application of AC
power, POWER light in the PAPER ADVANCE switch should
be lit and the printer's microprocessor should move
the print head all the way to the right, then to the
home position at the far left. If this does not

happen (and that'â highly unlikely), turn off both
machines, check all connections and try again. If
you still get no response, contact your Commodore
dealer.

4. Diagnostic Print Test
Now you can perform the diagnostic print test of the print

head and the ribbon cassette as well after you have

inserted the paper. Never allow any printing to occur
when there is no paper in the printer. If paper empty
occurs, the power/error indicator flashes. Please install
paper and then press the paper advance switch to cancel
paper empty status.
To perform the diagnostic print test, simply turn off the
printer and then turn on again while pressing the Paper

Advance Switch.

3-1

CHAPTER 3

OPERATING PRINCIPLE

3-2

Operating principle

1. Printing mechanism
The impact wire dot system is employed

Print head contains 8 solenoids circularly positioned on
the core frame, armature print wires operated by the
solenoids and wire guides. The 8 print wires are

precision located by the guides on top.

Printing is executed when the carriage travels at the
printing speed, the character generator sends the print
command pulses to the driver to operate the solenoids
which push the print wire through the armature onto the

ink ribbon finally onto the printing paper. Print timing

is controlled by the drive pulse of the pulse motor which
drives the carriage. A standard character is made with 7
x 5 dot matrix. The 8 solenoids are selectively
activated in each column according to the print data in
ROMs. The print wires return to the original position by
spring force after the solenoid operation. Printing is

bi-directional.

3-3

2. Carriage drive mechanism
Revolution of the CR motor is transmitted to the C drive
pulley through the motor gear.
The C drive pulley and the carriage idle pulley are
connected with the T-belt MM310-3.2 which is fixed to the
carriage with a holding plate.
As the CR motor runs forward and reverse, the C drive
pulley turns to move the T-belt and carriage right and
left along the guide bar and frame plate.

Print Head C Drive Pulley

Carriage Idle Pulley

A leaf switch is mounted on the left end of the frame.

When this switch is pushed by the projection provided to

the carriage, the carriage 0 position is detected.

3-4

3. Paper feed and release mechanism
(a) Paper feed mechanism
Revolution of the LF motor is transmitted to the platen
knob gear through the LF idle gear.
Platen is coupled with the platen knob so that it turns as
the LF motor does.

PF roller assy is built right under the platen. Three
roller retaining springs are used to hold three roller
assys on the platen. Paper is caught between the platen
and the roller and fed as the platen turns.

Retaining Spring

(PAPER FEED CONDITION) (PAPER RELEASE CONDITION)

By pressing once the LF key in the OFF LINE status (when

the ON LINE lamp is off), the paper is fed for one line,

keeping on pressing it, the paper is continuously fed.

3-5

(b) Paper release mechanism

By setting the release lever to OPEN, the paper release

shaft turns through the gear. The roller retaining spring
is released and the platen detaches from the PF roller
assy. (PAPER RELEASE CONDITION) In this condition, paper

position can be corrected.

(c) PE switch

PE switch detects the presence of the printing paper.

When the paper is being set, the PE switch actuator is

pushed down for printer operation.

When the paper has run out, the PE switch actuator moves

away upward to detect the PE condition. Then the ERROR

status turns on and the printer stops.

(Paper Empty) (Paper is set)

4. Ribbon feed mechanism
Revolution of the CR motor is transmitted to the carriage
idle pulley through the motor gear, C drive pulley and

T-belt MM310-3.2. And then, to the ribbon drive gear

through the idle pulley shaft secured to the idle pulley
and the ribbon idle gear. A spring clutch is mounted on
the idle pulley shaft and the ribbon drive gear shaft so
that the revolution is performed into FORWARD direction

(when the carriage moves from left to right)

Carriage

When the ribbon cassette assy is mounted to the mounting

part of the body cover, the ribbon advance gear A of the
ribbon cassette assy engages with the ribbon drive gear.

As the ribbon advance gear A turns, the ribbon advance

gear B turns and the ribbon advances.
Ribbon tension is built in the ribbon cassette assy to

provide proper tension to the ribbon.

3-6

H. Operation of the electrnonic parts

1. Structure

° P3, J8, etc. are the connector Nos. on the logic card.

3-7

2 CPU

yPD7811(NEC) is used for the CPU, Contains a 4K byte ROM
and a 256 byte RAM. Pin connections are shown below.

PA7-0 : Port A
PB7-0 : Port B
PC7-0 : Port C
PD7-0 : Port D
PF7-0 : Port F
F7RI : Non Maskable Interrupt
INTI : Interrupt Request
MODEO : Modeo, 1
XI, X2 : Crystal
ANT—0 : Analog Input
KI5 : Road Strobe
WR : Write Strobe
ALE : Address Latch Enable
RESET : Reset
VAREF: Reference Voltage

The control program and the CG ROM are masked in the

4K byte ROM in the CPU. MODE 1 and MODE 0 terminals are
fixed to 'HIGH' and 'LOW' respectively.
The analog input terminal functions to convert the analog
input of OV - + 5V into 8-bit digital data.
* See Section 7 for the addition of PROMs.

3. Interface circuit

+5V

3-8

Connectors J1 and J2 are the DIN connector for interface

and each connected in parallel.

DATA LINE is the serial 8-bit data and sampling is done by

the CLOCK LINE.

__

ATN LINE selects data for control (ATN = 'LOW') and for

ordinary data (ATN ='HIGH'). RES LINE is used for

resetting the printer. Resetting is done in the same way
as when power is first turned on.

The CPU operates with the synchronous serial input mode

made up with the DATA input port PCl/R x D and the CLOCK

input port PC2/3CK. PC3/INT2, INTI and PC5 are the input

port and PF5 is the output port.

INIT signal is a RESET input (RES LINE) from the interface

and connected to the RESET circuit.
Faston terminal is connected to the F.G.(Frame Ground) and

shields the interface cable.
Interface timing conforms to the CBM Serial Interface.

Data reception timing is described in the following:

ATN —f

CLOCK

DATA

3l3MS

max

TAT

,200MSma>'

[ i l i f

¡1:2!

T H

LISTENER

ADDRESS

ATN LOW edge
detected When 200us or over, moves

to EOI HAND-SHAKE

SECONDARY

ADDRESS when

ATN = 0

i _

DATA when ATN = 1

In this case,

SA = 0 is valid.

° After 3.3mm or over from ATN t edge, CLOCK = 1 is detected

and DATA is set to "HIGH", (at L.A.(LISTENER ADDRESS),
UNL reception)

1. ATN = 0 is referred to the LISTENER ADDRESS, SECONDARY
ADDRESS and UNLISTEN (UNL).

2. TH is equivalent to BUSY. If requesting NEXT DATA, wait

for CLOCK = 1 and set DATA to 1.
In the case of SYSTEM LINE-RELEASE, DATA is set to 60 -
8Ops "LOW" without regard to CLOCK.
SYSTEM LINE-RELEASE: LISTENER ADDRESS Not identified

3. TAT = 1ms max. TF * 20 - lOOOys

3-9

m —

r

i

i

When TH represents BUSY and the next DATA is requested,

DATA = 1 is executed after CLOCK = 1.

4. Switch panel

♦ 5V

CPU port PCO is an input port. By pressing the PAPER ADVANCE
switch, LFSW signal is set to 'LOW', which executes one line
feed. When 'LOW' status is maintained for about 0.5’ second,
the CONTINUOUS LINE FEED mode turns on. This is maintained
until LFSW signal changes to 'HIGH'.
CPU port PC4 is an output port and is normally set to 'HIGH'.

This port is used to flicker the POWER LED.

Flickering frequency:

PE detection 2.5 times/sec

MOTOR ERROR 10 times/sec

3-10

5. Limit switch +sv

HPSW signal turns to 'LOW' at CARRIAGE LEFT END detection.
PESW signal is set to 'HIGH' at PE detection.

At POWER ON or RESET, the internal ROM. is checked. If normal,

the carriage is moved to the left end. If the time, takes longer
than specified to LEFT END detection, MOTOR ERROR occurs. If

LEFT END detection is correctly done, the carriage is moved to

the center. If LEFT END detection still continues, MOTOR ERROR
occurs.
Actual PE processing is executed at 3 lines after the PESW

signal has turned to 'HIGH' status. PE detection is executed
right before the line feed and print start operations.

6. Function select switches

CPU

Switches SW1 and SW2 can be operated from outside together with

the interface connector. SW1 is used to select the LISTENER

ADDRESS (4 or 5). SW2 is used to select the amount pf paper

feed (l"/6 or l"/8). SW1 is set to 4 and SW2, to 6, normally.

3-11

7. External ROM circuit
CPU is operating by the internal ROM of 4K byte. If necessary,
an external ROM 14K byte can be used for the control. The
following paragraphs explain the installation of external ROM.

CPU

When the internal ROM is used, Mode 0 terminal is set to
and MODE 1 to 'HIGH'. If the external ROM is to be used

1 terminal shall be set to 'LOW'.

LOW'
MODE

¡) 74LS373

-*■

V 7811G

74 LS373 added

---

2732 added

JW1

Jump wire added

\o oi

JW2

Above three additions enables the external ROM control.

3-12

8

Paper feed driver circuit

+SV

LF MOTOR

— rrrrr-

— nrm^-

— npnrr-

—nrrrr-

The LF motor is a step motor of PM type. It is stopped by the
detent torque.
Operated by 2-2 phase excitation. 1/216 per 1 step with the
operating speed at 200 pps. 36 steps is necessary for l"/6
feed.

Paper feed is executed by the
excitation sequence shown on the left.

For driver IC M54567, second source TD 62308AP is sometimes
used.

PIN CONNECTIONS

HEAT SINK

COM 04 14 S£NP 13 03 COM

— 1

H

6 -1 5 4 l4 UT

ffp

ariT U io U Tt!

U^x>-Ld»--

1 M 2 N 3 M <i H *

5 ti 6 n 7 n s H

Vcc 01 II HEATSINK 12 02 Vte2

iGND

BASIC CIRCUIT

3-13

9. Carriage Driver Circuit

CPU

CR motor is a step motor of PM type. When stopped, CRPLS is
set to 'HIGH' and is powered by +9V source for holding.
Operated by 2-2 phase excitation. l"/60 per 1 step with the
operating speed at 360pps. The carriage reverses when the
excitation sequence for the LF motor mentioned before is
applied.

Basically performs 8-pulse SLEW UP/DOWN.
While running CRPLiJ is set to 'LOW' and the motor is supplied
with +24V power.
Driver IC is same as that for paper feeding.
Pica size takes 1"/10 and is comprised of 6 steps.

10. Head Driver Circuit
CPU

3-14

By setting data by negative logic to CPU ports PBO - PB7 and by

setting HPLS signal to 'LOW' for a required period, the head
solenoid is driven. At the same time, Vcc terminal of the

driver IC is also controlled. Therefore, the head solenoid

transistors on the power source side and the ground side are
always controlled together at the same time. Transistor Q10 on
the power source side is provided with a thermo-sensitive

resistance (PTH) which has a positive temperature coefficient.
At about 60 °C, AN1 signal reaches 2.5(V). While AN1 signal
maintains 2.5V, BUSY is added after printing for about 0.5

second. This is to prevent overheat of the head.

3-15

Since the +24V power source is not a stable power source, as
described later, the head driving time should be properly
controlled to stabilize print quality.

ANO signal is used for this purpose, and is the voltage

obtained by dividing +24V by resistance.

<u
E

•fi

S
o

a

(0
c
O'

•H

CO
CO

»4

Û4
s

+24V Power Source Voltage

Adequate Pulse Width for +24V Power Source Voltage

Head Driving Timing Chart

Approx. 2,8 ms

Motor Phase Excitation

Motor Phase Excitation

HPLS Signal

TYP. •
500 MS

ITU- LT

3-16

11. Reset Circuit
4 24 V

In the above 3 periods, RËSËT signal stays 'LOW' and the CPU is
initialized. RESET signal width at POWER ON is about 60ms.

Transistors Q6 and Q7 form Schmit property.

12. Power Supply Circuit

AC input

+24V power source is un-regulated. Voltage at rated input

without load is 27 (V) and that, at self-printing is 24 (V)

approximately.
5V power source is stabilized by the 3-terminal regulator 7805.
Its output is 5+5% (V) at normal condition. +9V power is taken
at the regulator input. It has 10 (V) at rated input.
The POWER switch has the breaker function. It indicates ON
though the breaker is operating. The AC input is turned off at
this time. If the breaker has tripped, turn off the switch and
then turn it on again to reset. The power transformer is
equipped with a tap. Wires not used shall be pushed into the

pocket of the transformer.

4-1

CHAPTER 4

MAINTENANCE

4-2

I. Notes for the maintenance

The following notes shall be observed during the
maintenance operation to prevent disorder which may be
caused by improper handling and operation.

1. Maintenance operation shall be done by the personnel
qualified through a regular High-speed Printer Technical
Service Course or who has an equivalent technical
qualification.

2. Do not perform printing without loading paper.

3. Do not put things on the printer cover during
maintenance and operation.

4. Always turn off the power when replacing the parts
and units. Especially, when replacing the power supply
parts, remove the power cable from the outlet and surely
turn off the power.

5. Do not lose screws and washers removed for parts
replacement.

6. When using the tools which generate heat such as
soldering iron, use care not to damage the resin parts
such as cords and printer cover.

7. When replacing the printed circuit boards, the static

electricity may ruin the electronic parts on the board.
To avoid this, operators are required to touch the metal
part of the machine body by hand to discharge the static

electricity before handling the boards.

8. Printed circuit boards shall be wrapped in a

conductive sheet made of aluminum film when they are
carried.

After repair, check the repaired and the connectors for

correct fit and then conduct operational.

9.

4-3

H. Disassembly, replacement and adjustment of parts

1. Detachment & attachment of the cover and ribbon cassette.
i_.( Detachment 3

(1) Lift up part (a ) . (2 positions right & left) of the TOP

COVER and disengage the lock. Detach it by pulling it
forward.

(2) Return the HEAD to the HOME POSITION (left end).

(4)

Turn the RIBBON ADVANCE KNOB in the direction of arrow

until the RIBBON GUIDE stops. Wind up the ribbon
completely into the cassette.

Ribbon Advance Knob

I

\

R i b b o n G u id e

\

R ib b o n C a s s e t t e A s s y

(5 ) H o ld t h e c a s s e t t e a t t h e c e n t e r a n d l i f t i t u p t o d e t a c h

fro m t h e b o d y .

R ib b o n C a s s e t t e A s s y

(6) Remove two BODY COVER SCREWS (+ pan set screw 3 x 12 DB)

—¿B o d y C o v e r S c r e w s — -

( + PAN SET 3 x 12 DB, 2PCS)

4-5

(7) Lift up the BODY COVER on the front a little, pull out the

SWITCH CARD HARNESS CONNECTOR and remove the lead wire

from the WIRE HOOK B on the BASE COVER. Then the BODY

COVER can be detached from the printer body.

Note) Hold the connector when pulling it off. Do not pull

the lead wire.

Wire Hook B |

Switch Card Harness Connector

4—6

(Attachment)

(1) Attach the cover following the reverse procedures of

detachment.

(2) For attaching the ribbon cassette, refer to Section 4 of

CHAPTER 2.

2. Detachment & attachment of the head
(Detachment)

(1) Detach the top cover.
(2) Move the head to the right end as shown below.

(3) Pull out the bent tab using a ball-point pen.

(4) Hold the tab with hand and pull the cable upward.

4-

(5) Slide the HOLDING PLATE fixed on the carriage to the right

and pull it upward.

(6) Push the HEAD HOLDING SPRING onto the PLATEN and pull

upward the PRINT HEAD strongly to remove the HEAD.

4-8

I(Attachment)

Cl) Insert the PRINT HEAD lightly into the CARRIAGE.

( 2 )

Install the CABLE into the CARRIAGE and CABLE BRACKET as
shown.

(3) Install the HOLDING PLATE and slide it to the left.
(4) Push down the HEAD strongly to fix it into place.
(5) Bend the TAB and insert it to the connector.
(6) Make sure the cable is installed in the FRAME GUIDE.

(7) Check if the carriage moves smoothly right and left by

hand. Then turn on the power and perform SELF-TEST to

check if printing is correctly done.

(Turn on the power while pressing the PAPER ADVANCE

switch.)

4-9

(Adjustment of the head to platen clearance)

If the clearance is not properly provided, such troubles as
uneven darkness of print characters and ribbon blotting may
occur. To avoid this, adjust the clearance properly.

(1) Use the CLEARANCE ADJUSTING LEVERS provided to the FRAME

on both sides to adjust the clearance to 0.4 - 0.45mm.
Perform adjustment on the both sides of the PLATEN.

4-1 0

3. Detachment & attachment of the frame unit

I[Detachment)

(1) Detach the cover as described before.
(2) Remove two FRAME TIGHTENING SCREWS (+ pan set 3 x 8 DB).
(3) Pull off the PE/EP HARNESS ASSY and connectors of the CR

motor and LF motor.
Then the FRAME UNIT can be separated from the BOTTOM
COVER.

Note) Pull off the connectors by holding the connector

body. Do not hold the lead wires.

(Attachment)

(1) Perform attachment by following the reverse of the

detachment procedures.

Note) Use care not to catch the lead wires during

attachment.

4-11

4. Detachment & attachment of the T-belt

(Detachment)
(1) Detach the FRAME UNIT following the cover and head

detachment procedures described before.

(2) Remove the tightening screw A on the FRAME PLATE. Move

the PLATE in the direction of arrow and remove.

Tightening Screw A

(3) Turn the PARALLELISM ADJUSTING CAM once, located on the

right side of the FRAME. Pull it out where the holes

coincide, together with the guide bar.
(4) Remove the carriage and T-belt. Attach a new T-belt.
(Attachment)

(1) Perform attachment following the reverse of the detachment

procedures.

(T-belt adjustment)

If tension of the T-belt is not proper, the belt may skip on
the gears or the load in carriage travel often abnormally
increases.

Adjust T-belt tension when the belt and CR motor are replaced.

(1) Move the carriage to the left end of the FRAME.
(2) Proper tension is that the T-belt deflects for 8 - 10mm

when applied with a vertical load of lOOg at the center of

span using a tension gauge. Adjust by loosening the

tightening screw of the CR motor and rotate the CR motor
until proper tension is found. Tighten the mounting

screws of the CR motor.

4-12

5. Replacement of the CR motor
:(Detachment)

(1) Detach the frame unit following the procedures for

detaching the cover and head described before.

(2) Remove two CR MOTOR MOUNTING SCREWS (A) and detach the

motor assy from the FRAME PLATE.

CR Motor
Mounting Screw (A)

/ Carriage Drive Pulley

'Sv'*© / Carriage I Pulley Flange

I / Flat Washer Small 4

I Pulley Unit Assy Retaining Ring E3

(3) Remove RETAINING RING E3 (B) from the CR MOTOR UNIT.
(4) Remove FLAT WASHER SMALL 4 (C), CARRIAGE I PULLEY FLANGE

(D) and C DRIVE PULLEY (E) from the shaft.

(5) Attach the parts removed in 4 above to a new CR motor and

secure them with RETAINING RING E3 (B).
(Attachment)
(1) Perform attachment following the reverse if the detachment

procedures.

(Adjustment required by replacement of the CR motor)

(1) Adjust the tension of the T-belt.

Refer to the adjustment procedures described before.

6. Detachment & attachment of the I pulley unit assy
(Detachment)

(1) Detach the assy following the detachment procedures for

the cover, and remove a + PAN SEMS 3 x 8 DB (A) on the
frame front.

4-13

i(Attachment]

(1) Attach a new I PULLEY UNIT following reversely the

detachment procedures.

7. Detachment & attachment for the LF motor
(Detachment]

(1) Detach the FRAME UNIT following the reverse of the

detachment procedures for the cover and head described

before.

(2) Detach the PLATEN ASSY, PLATEN SHAFT BRACKET and RELEASE

LEVER upward.
Pull outward and disengage the' latches of the platen shaft
bracket to detach the bracket.

9

(3) After detaching LF IDLE GEAR (B), remove LF MOTOR

TIGHTENING SCREW (C) and detach LF MOTOR (D) from the

frame.

4-14

i(Attachment 3

(1) Mount a new LF motor to the frame. Then, attach the LF

idle gear, platen assy, release lever and platen shaft

bracket to the frame.

Note) a. Attach the platen assy, release lever and platen

shaft bracket so that the release lever engages

with P release gear on the CLOSE side. See the

illustrations below.

b. Make sure the latches (A) of the platen shaft

bracket (2 each) surely engage with the frame.

1(Adjustment of LF motor mounting position)

(1) Loosen the LF Motor tightening screw and adjust so that

the backlash between LF motor gear and LF idle gear is

maintained within 0.05 to 0.2mm.

8. Detachment and attachment of PE/HP harness assy
!(Detachment)

(1) Detach the frame unit following the detachment procedures

for the cover and head as described before.

(2) Turn the frame unit upside down and detach the PE SWITCH

HOLDER by opening the LATCHES (A) into the direction of

arrow.

(3) Remove the HP SWITCH MOUNTING SCREW (B) and detach the HP

SWITCH upward.

<2

_____

-HP Switch Mounting Screw (B)

4-15

(4) Detach the PE switch assy by opening the latches engaged

with the PE switch holder.

(5) Attach a new PE switch assy to the PE switch holder.

Note) Make sure the latches securely engage with the PE

switch assy.

(Attachment)

(1) Attach PE switch holder and HP switch following reversely

the detachment procedures.

9. Detachment & attachment of the logic card
(Detachment)

(1) Detach the logic card following the detachment procedures

of the cover and frame unit as described before.

(2) Pull out the CONNECTOR (A) of the TRANSFORMER ASSY.

Note) Hold the connector to pull it out. Do not hold the

lead wires.

(3) Pull out the INT FG WIRE (B).

(4) Lift up the LOGIC CARD and open the holding parts (C), (D)

and (E) into the direction of arrow.

Disengage and pull the card forward to remove it.

(Attachment)

(1) Attach the card following the reverse of the detachment

procedures.

Transformer Assy

4-16

10. Detachment & attachment of the transformer

■(Detachment)
(1) Detach the transformer by following the detachment

procedures for the cover and frame unit first.

(2) Disconnect two Faston terminals connected to the noise

filter.

(3) Remove two TRANSFORMER MOUNTING SCREWS (A) and slide

the transformer backward to detach it.

I(Attachment)

(1) Attach the TRANSFORMER by inserting it into the hole of

the POWER SUPPLY HOLDER and tighten with two screws.

(2) Connect two Faston terminals to the noise filter.

11. Detachment & attachment of the noise filter
'(Detachment)

(1) Detach the noise filter by following the detachment

procedures of the cover and frame unit.

(2) Disconnect the Faston terminals (3 left, 2 right)

connected to the noise filter.

(3) Remove a mounting screw (B) on top, slide the filter

upward to detach.

12. Detachment & attachment of the power switch

(Detachment)
(1) Detach the cover and frame unit as described before.
(2) Pull the POWER SWITCH upward by opening the latches..,

(Attachment)

(1) Attach the switch following the reverse of the detachment

procedure. After attachment, put the POWER CORD between
the rib and switch. (to eliminate looseness of the switch
attachment)

4-17

13. Detachment & attachment of the power cord
'[Detachment}

(1) Detach the cover and frame unit as described before.
(2) Disconnect two Faston terminals on top from the noise

filter, and remove the tightening screw of the GROUND
terminal.

Remove two CORD RETAINING SCREWS and pull out the cord

through the hole on the back of the BOTTOM COVER.

i(Attachment}

(1) Attach the cord following the reverse of the detachment

procedure.

HE. Lubrication

Supply oil to the parts mentioned below at replacement.

(1) GUIDE BAR all around
(2) Sliding part between FRAME PLATE and CARRIAGE
(3) Shaft with which LF IDLE GEAR engages
(4) Engagement between PLATEN SHAFT BRACKET and PLATEN SHAFT
(5) PE ROLLER SHAFT GUIDE of the FRAME and contacting part

between PF ROLLER SHAFT and ROLLER RETAINING SPRING.

Lubricate (both sides)

(1) - (4) Silicon oil KF961 (lOOcs)

(Shinetsu Silicon)

(5) Grease B

Note) Apply lubricant thinly and evenly. May drip if

excessively applied.

5-1

CHAPTER 5

CIRCUIT DIAGRAMS

" , . .r.29^

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« g ~ 1 .

K - W in

« R3i~_ ƒ -

fsiîîfîi^tsîltsM J-fr

0IIG I ‘

> »»pggjc^bl

*— CTrI r

R5I

' C 2 8

CAUTION MOS 1C MADE IN JAPAN

5- 2

B48W 006

5-3

\?\?

liï

a

a

■
<•
a

S

c

•

— Ti.' ’’

1 1

PIN 5

2

2

ñN 7

3 3

PiN3

4

4

■ —

S

5

HORV

6

6

HORV
7 7 PiN 8
8 8

PiN 1
9 9

PiN 6

10 10

PiN 4

11 11

ñN 2

P4.

LFA

6

6

LFB

5 5

LFA

4 4

LFB

3 3

LF O RV

2 2

LF DRV

1 1

P7

OV

3 3

PESW

2 2

HPSW

1 1

J1. J2

RES

6

6

OATA

S

S

CLOCK

4

4

ATN

3 3

OV *

2 2

— 1 1

'O-

P3

CRA 6 6
CRA 5 S
CR B

4 4

CR B

3 3

CRORV

2 2

CR ORV 1 1

•eu«jQ

5—4

RESET CD7)

6-1

CHAPTER 6

PACKAGE DRAWINGS

1.

Parts Code Q'ty

Name

1

U23049001

1

TOP COVER ASSY

2

U23082001

2 COVER LID

3 U23047001

1 BODY COVER

4

U23048001

1

FRONT COVER

5

U32143001

1

CIRCUIT BOARD 48W006 ASSY

6

571969000

1 CORD HOLDER 2

.7

U23057001

2

PAN CUP B 3.0 x 20

8

U23056000

1 POWER SUPPLY HOLDER

9

U23044001

1 BOTTOM COVER ASSY

10

533655001

2

+ PAN SET 3 x 12DB

6-3

2. Parts Code
1 U23036001

2 U23042001

NOTE: Service order

U23095001 RC Box A12 ASSY

Q 'ty Name

1 RIBBON CASSETTE ASSY

1 RIBBON GUIDE

U2 309 700 1

RC Box A3 00 A SS Y

6-4

2

3
4
5

6

7
8
9

U23001001
U23004000
U23003001

U22077001

U23005001

U22078001

5335270.01
U23165001

1

1

1

3

2

3

2

1

FRAME
P RELEASE GEAR
P RELEASE SHAFT

PF ROLLER ASSY

ROLLER HOLDING SPRING
PF ROLLER SHAFT
+ PAN SEMS 3 x 8 DB

ROLLER HOLDING SPRING A

NOTE: Parts cocle of ASSY of 1-7 above,

U23000001 FRAME ASSY

s

4.

Parts Code

Q'ty

Name

1

Z20276001 1

MOTOR ASSY BP483518

2

U20545001

2

+ PAN SEMS 2.6 x 8DB

3

U23028000

1 LF IDLE GEAR 216

4

U23032001 1 PLATEN KNOB

5

048060345

2

RETAINING RING E6

6

U23154000 2

PLATEN SHAFT BRACKET

7

U23030001

1

PLATEN

8 U23033001 2

PLATEN SHAFT

9

U23034001

1

RELEASE LEVER

NOTE:

Parts code of ASSY of 4-9
U23029001 PLATEN ASSY

above,

6-6

5.

Parts Code Q'ty

Name

1

U23007000 1

HOLDER PLATE

2

U23300001 1

HEAD ASSY P8

3

U23017001 1

T BELT MM310-3.2

4

U23006000 1 CARRIAGE

. 5

U23159000

1

HEAD CABLE SHEAT A

6

U23008000

1

HEAD HOLDING SPRING

6-7

1 U23010000
2 U23009001
3 533527001
4 U23016001
5 048040345
6 U23022001
7 U23023001
8 U23019001
9 U23026000
10 U23024000
11 533527001

12 U23027001

2

1

1

1

2

1

1

1

1
1
1
1

PARALLELISM ADJUSTING CAM

GUIDE BAR

+ PAN SEMS 3 x 8DB
FRAME PLATE
E4 RETAINING RING
CARRIAGE IDLE PULLEY
CARRIAGE I PULLEY
I PULLEY HOLDER ASSY

RIBBON IDLE GEAR
PF CLUTCH GEAR
+ PAN SEMS 3 x 8DB
RIBBON DRIVING GEAR

6-8

13

U04130000

2 CARRIAGE I PULLEY FLANGE

14

025040133

1

FLAT WASHER SMALL 4

15

048030345 1

RETAINING RING E3

16 U23015000 1 C DRIVING PULLEY
17

Z20251001

1 42CR MOTOR ASSY

18 533527001

2

+ PAN SEMS 3 x 8DB

19 U23025001

2

SPRING CLUTCH 5

20 510061001 2

WASHER

21

025050135 1

FLAT WASHER SMALL 5

NOTE(1) Parts code of ASSY of 13-17 above, U23014001 CR MOTOR

UNIT ASSY

(2) Parts code of ASSY of 5-10 and 12-13 above, U23018001

I PULLEY UNIT ASSY

6-9

1 U32148001 1

U32149001 1
2 519475002 2
3 U32150001 1

U32151001 1
4 U03292001 1
5 U32159001 1

U32160001 1
6 U32153001 1

U32042001 1

U32052001 1
U32164001 1
U32231001 1

U32251001 1

TRANSFORMER 100/117 ASSY
TRANSFORMER 220/240 ASSY

COLLAR SCREW 3.5 x 6
NOISE FILTER MR2021
NOISE FILTER MR2021V
+- PAN SEMS 3 x 7DA

PROTECTOR SW0.5A
PROTECTOR SW0.4A

565 AC CORD ASSY #1
565 AC CORD ASSY #2
565 AC CORD ASSY #3
565 AC CORD ASSY #4
565 AC CORD ASSY #5
565 AC CORD ASSY #6

6-10

7 U32242001

1

8

037281213 1

9

U23175000 1

10

U32161001

1

11 519475002

1

12

550719002

1

13 U32152001

1

PE/HP HARNESS WHOLE-ASSY

PAN TAP 2 TYPES 26 x 12
ELECTROSTATIC WIRE
FG WIRE ASSY
COLLAR SCREW 3.5 x 6

RING 4
SW-NF WIRE ASSY

6-11

Parts Code

Q'ty

Name

1

U32027001 1

CIRCUIT BOARD 8W005 ASSY

2

U23058000

1

INSULATOR

3 U32158001

1

INT FG WIRE ASSY

4

519475002

1

COLLAR SCREW 3.5 x 6

5

550719002

1

RING 4

6-12

Parts Code

Q'ty

Name

1 U23066001 1

W DRIVING GEAR

2

048050346

3

RETAINING RING E5

3

U23076001 1

PAPER WHEEL

4

U23068001

2

BEARING

5 U23067001

1

W DRIVE SHAFT

6

U23081001

1 PIN FEED COVER L

7 037260812 2

PAN TAPPING V SHOE 2.6

8

U23064001

1 W IDLE GEAR

9

U23063001 1

W IDLE GEAR SHAFT

10 U23062001

1 PIN FEED FRAME

11

U23080001 1

PIN FEED COVER R

12

U23070001

1 WHEEL FRAME L

13

U23071001'

1

WHEEL DOOR L

14

U23074001

1

WHEEL FRAME R

15

U23075001

1

WHEEL DOOR R

16

U23072001

1 PIN WHEEL

NOTE: Parts code of ASSY of 1-16 above,U23061001 TRACTOR UNIT

7-1

CHAPTER 7

TROUBLESHOOTING

7-2

TROUBLESHOOTING

Trouble mode

Check

Probable causes

(1) Does not

operate by POWER

ON. (POWER LED

off)

° Connectors for power

supply
0 Fuse
0 Power supply voltage

8 Incomplete connection

from the power cord to
transformer connector.
8 Fuse failure or
regulator 805 trouble on
the logic card.

(2) Does not

operate by POWER

ON. (POWER LED

on)

8 POWER LED is
flickering.
8 +24V power supply

voltage is normal.

8 When flickering, MOTOR

ERROR is suspected.
CARRIAGE DRIVER CIRCUIT
or CR MOTOR trouble.

8 MOTOR ERROR occurs when

+24V is not supplied.
Fuse or rectifier bridge
on the logic card
trouble. Power
transformer trouble.

8 When not flickering,
ROM CHECK ERROR is
suspected. CPU trouble
or RfiSET signal circuit
trouble.

(3) Head does not

move to center at

POWER ON.

8 Same as above.

HP switch trouble.

(4) Incorrect

printing

8 Interface cable is

appropriate.

8 May print incorrectly

if the cable is too long.
8 CPU on the logic card
trouble.

(5) Carriage

moves but does

not print.

8 Head cable is correctly

connected.

8 Head cable is not

inserted to the
connector.
8 Trouble around
transistor Q10.

(6) Specific pins

are not impacted.

«

8 Replace head.

8 Head trouble.

8 CPU and head driver IC
trouble
Correct head resistance

approx. 33£2
Connector pins No.5 and
No.6 are common.

7-3

(7) LF Motor

becomes

— disordered.

° Mechanically
heavy-loaded.
° Gears cause racing.

° If mechanical factors
are not suspected, the LF
driver IC on the logic
card and CPU trouble.
LF motor resistance:

approx. 1600
GREEN COMMON

(8) CR motor

becomes

disordered.

° Mechanically
heavy-loaded such as
ribbon load.

° Gears cause racing.

' i

° If mechanical factors
are not suspected, the
carriage driver IC on the
logic card and CPU

trouble. Trouble around
transistor 08.
CR motor resistance:

approx. 1060
RED COMMON

(9) At POWER ON,
POWER LED does
not come on
though carriage
correctly
operates.

° Connector P5 is
correctly connected.

° LED on switch panel

trouble.

° Transistors Q1 & Q2 on
logic card trouble.

(10) DEVICE NOT

PRESENT ERROR

__

occurs.

° LISTENER ADDRESS

setting.

° If setting is correct,
SW1 trouble. CPU port
trouble.

(11) Amount of
line feed is
incorrect.

° Line feed setting. ° If setting is correct,

SW2 trouble. CPU port
trouble.

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