Olivetti CMS 240, CMS 140 Service Manual
Cash Register
CMS 140 euro / CMS 240 euro
SERVICE MANUAL
Code 686711S-00
PREFACE
This manual is addressed to the field engineers who will install and service the CMS 140/240 cash register.
It provides all the information needed for a correct product maintenance.
SUMMARY
This manual is divided into six chapters.
The first three chapters describe the operating, functional checks, and maintenance and repair procedures.
Chapter 4 describes the disassembly and adjustment procedures. Chapters 5 and 6 describe the electronic
circuitry and provide the schematics.
The appendix holds the SPARE PARTS CATALOGUE.
PREREQUISITES
The topics described in this manual require knowledge of similar products.
REFERENCE DOCUMENTA TION
Instruction Manual - (provided with the product)
DISTRIBUTION: General
FIRST EDITION: November 1998
NEWSLETTER: September 1999
686710D Service Manual iii
686711S
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CONTENTS
1. OVERVIEW
1.1 TECHNICAL SPECIFICATIONS ... 1-1
2. SPECIFICATIONS AND OPERATING
PRINCIPLES
2.1 SPECIFICATIONS......................... 2-1
2.1.1 Features ................................... 2-1
2.1.2 Specifications........................... 2-1
2.1.3 Mechanisms............................. 2-2
2.2 OPERATING PRINCIPLES........... 2-3
2.2.1 Transmission/SelectMechanism 2-3
2.2.2 Detector Mechanism ................ 2-6
2.2.3 Printing Mechanism ................. 2-7
2.2.4. Inking Mechanism .................... 2-9
2.2.5 Paper Feeding Mechanism ..... 2 -9
2.2.6 Printer Operation During One Print
Cycle Initialization .................... 2-10
3. HANDLING, MAINTENANCE, AND
REPAIR
3.1 HANDLING THE PRINTER .......... 3-1
3.1.1 Precautions on Printer
Handling ................................... 3-1
3.1.2 Paper Setting ........................... 3-1
3.1.3 Installating the Ink Roll Assembly 3-2
3.2 MAINTENANCE ............................. 3-2
3.2.1 Cleaning ................................... 3-2
3.2.2 Inspection................................. 3-2
3.3 APPLICATION OF LUBRICANTS. 3-4
3.3.1 Lubricant Types ....................... 3- 4
3.3.2 Lubricating Requirements ....... 3 -4
3.3.3 Lubrication Points .................... 3-4
3.4 TOOLS AND LUBRICANTS .......... 3-5
3.4.1 List of Tools.............................. 3-5
3.4.2 List of Lubricants ..................... 3-5
3.5 REPAIR.......................................... 3-5
3.5.1 Repair Levels ........................... 3 -5
3.5.2 Repair Procedures................... 3- 5
3.5.3 Repair Guidelines .................... 3-6
4. ASSEMBLY AND DISASSEMBLY
4.1 GENERAL...................................... 4-1
4.2 MACHINE DISASSEMBLY -
REASSEMBLY ............................... 4-2
4.2.1 Machine Case .......................... 4- 2
4.2.2 Printer Unit ............................... 4- 2
4.2.3 Main Board and Display .......... 4 -3
4.2.4 Paper Feed Motor.................... 4-3
4.2.5 Power Supply ........................... 4-4
4.2.6 Keypad ..................................... 4-4
4.3 PRINTER DISASSEMBLY -
REASSEMBLY ............................... 4-5
4.3.1 Ink Roller .................................. 4- 5
4.3.2 Electrical Connections ............. 4-6
4.3.3 Return Spring........................... 4-7
4.3.4 Snap Ring ............................... 4 -7
4.3.5 Gear ......................................... 4 -8
4.3.6 Motor ........................................ 4-10
4.3.7 Detection Wheel ...................... 4-11
4.3.8 Platen Assembly Removal ....... 4-12
4.3.9 Printer Carriage ....................... 4-1 3
4.3.10 Printer Carriage ....................... 4-14
4.3.11 Machine Case .......................... 4-1 6
5. CIRCUITRY
5.1 GENERAL ...................................... 5-1
5.1.1 Block Diagram.......................... 5-1
5.2 POWER SUPPLY CIRCUIT .......... 5-2
5.3 TRANSFORMER WIRING DIAGRAM 5-3
5.4 POWER SUPPLY SPECIFICATIONS 5-3
5.5 RESET CIRCUIT ........................... 5-4
5.6 POWER FAIL CIRCUIT................. 5-4
5.7 DISPLAY CIRCUIT........................ 5-5
5.8 DISPLAY TUBE INFORMATION .. 5-6
5.9 KEYBOARD CIRCUIT .................. 5-7
5.10 PRINTER CIRCUIT ....................... 5-8
5.11 DRAWER CIRCUIT ....................... 5-9
5.12 BATTERY CIRCUIT ...................... 5-9
5.13 BUZZER CIRCUIT ......................... 5-9
6. SCHEMATIC AND DIAGRAM...... 6-1
SPARE PARTS CATALOGUE ......... A-1
686710D Service Manual v
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1. OVERVIEW
1.1 TECHNICAL SPECIFICATIONS
Type:
Display:
Capacity:
Printer:
Paper supply:
Memory battery protection:
Technology:
Voltage:
Power consumption:
Fig. 1-1
Electronic cash register with printer and eight
departments
Fluorescent display , symbols f or error , change,
minus, total and program mode
Input 7 digits and readout
Serial printer with ink roller
57-mm single ply register tape
Approx. 3 months after power interruption via
4 AA batteries
CMOS RAM
220-240V 50/60 Hz ~ 115V 50/60 Hz
0.07A; operating 0.22A
Operating temperature:
Dimensions:
Weight:
686710D Service Manual 1-1
686711S
0° to 40°C
Depth 425 mm, width 324 mm, height 220 mm
Approx. 6 kg
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2. SPECIFICATIONS AND
OPERATING PRINCIPLES
2.1 SPECIFICA TIONS
2.1.1 Features
The Micro Printer was designed and developed as a
printer for use with calculators. It offers the following
features:
• Ultra-compact and lightweight design.
• Use of movable type for sharp printing quality.
• High printing speed due to a carriage return
mechanism that can return the carriage from any
column position.
• Silent operation and printing.
• Provided with quick feeding and paper free
functions.
• Use of ordinary calculator paper.
• Requires no control of the motor speed.
2.1.2 Specifications
The main specifications are listed as follows.
Print method
Type-printing serial printing
Carriage width
Max. 19 printable columns (including one column of
symbols)
Character position
On symbol column side: 13 positions +1 empty
positions
On numeric column side: 14 positions
Character size
1.6 (W) x 2.5 (H) mm
Intercharacter intervals
Between numerics: 2.1 mm
Between a numeric and symbol: 2.6 mm
Line spacing: 4.6 mm
Paper (Supplied by the user)
Type: Regular paper
Size: Width 57.5 mm +/- 0.5 mm
Roll diam.: 80 mm or less
Thickness: 0.06 - 0.085 mm
Aver age weight: 47 g/m2 - 64 g/m
(40 - 55 kg/1000 sheets/1091 x
788 mm)
Paper feed
TYP 8 lps. Fast paper feeding is also possible and a
paper release mechanism is provided.
Inking
Ink roll method
Colors : Purple or black
Ink roll life: Purple 1,000,000 characters
Black 350,000 characters
Standard: IR-40
Motor
Terminal voltage: 6.0 +0.5 -2.0 VDC
Average current: Approx. 0.25 A (during 19
columns 7 character shift
printing at 6.0 VDC, 25°C)
Detector
Mechanical point of contact
Reset signal "R", Timing signal "T", and a Sub-Timing
signal "t"
D .C. resistance: Approx. 20 Ohm +/- 2 ohm (at 25°C)
Connection method
Jumper Wire on printer side
Guaranteed operating temperature
0°C - 50°
External dimensions
86 (W) x 58.4 (D) x 19 (H) mm
Weight
Approx. 90 g.
2
Print speed
Average printing speed at 6.0 VDC
19-column printing: TYP 0.9 l/s
7-column printing: TYP 2.2 l/s
686710D Service Manual 2-1
2.1.3 Mechanisms
This printer consists of two print wheels, a hammer,
and a carriage equipped with an ink roll. It is a serial
printer with movable type, and performs printing by
sequentially moving across from the lowest-order
column.
When the motor is activated, the gear trains rotate
and cause the print wheels and detection wheel to
rotate. When the trigger coil is charged according to a
signal (which corresponds to a character) output from
the detector, character selection is perf ormed, the print
wheel stops, the print gear is rotated by the action of
the planet gear, a character is printed then the carriage
shifts to the next column (column-shift operation).
When the charge to the trigger coil is lengthened
during character selection performed at the end of
line, printing is performed then the carriage is returned
to the initial column and the paper is fed forward,
thereby completing the printing of one line.
This printer consists of five mechanisms: the
transmission and selective mechanism, detection
mechanism, print mechanism, inking mechanism, and
paper feeding mechanism.
Fig. 2-1 shows an external view of the Micro Serial
Printer. For details on the operating principles and
handling of each mechanism, see section 2.2,
“OPERATING PRINCIPLES”, and Chapter 3,
“HANDLING, MAINTENANCE, AND REPAIR”.
Fig. 2-1 Exterior View
2-2 Service Manual 686710D
2.2 OPERATING PRINCIPLES
2.2.1 Transmission/Select Mechanism
As shown in Fig. 2-2, this mechanism consists of the
reduction gear train, selective mechanism, print gear
train, and paper feed gear train.
➈
Fig. 2-2 Transmission/Select Mechanism
686710D Service Manual 2-3
Reduction gear series (See Figs. 2-2 and 2-3.)
The reduction gear train consists of the motor gear,
reduction gear, planet gear, selective drive gear,
selective gear assembly, selective pawl, and print
changeover cam. When the motor rotates 2, the
rotation force is sequentially reduced from the motor
gear 3 on the same shaft through the gear tr ain to the
selective gear assembly 7.
The rotation of the print changeover cam is lock ed by
the action of the selective pawl, so the paper feed
ratchet wheel 8 on the same shaft as the selective
gear assembly, the print wheel, and detection wheel
also rotate at the same time.
Fig. 2-3 Reduction Gear Series
2-4 Service Manual 686710D
Select mechanism (See Figs. 2-2 and 2-4.)
As shown in Fig. 1-4, the select mechanism consists
of the selective gear assembly, trigger coil, trigger
plate, and selective pawl. During rotation of the
reduction gear series, when a Drive signal is input 9
to the trigger coil in conformance with the Timing signal
output from the detector, the trigger plate is drawn 10
to the yoke fixed onto the selective gear assembly so
that the trigger plate 11, trigger lever 12, and selectiv e
pawl 13 rotate together with the rotation of the selective
gear assembly. At the same time as the print
changeover cam is unlocked, the selectiv e pawl loc ks
15 the tooth section corresponding to the character
of the selective gear assembly. When the selective
gear assembly is stopped, the print wheel mounted
on the same shaft is stopped also, and character
selection is performed.
Print gear series (See Figs. 2-2 and 2-4.)
The print gear series consists of the print changeover
cam and print gear. When the selectiv e gear assembly
is stopped by the select mechanism, the interlocked
selective drive gear is also stopped. At the same time,
the unlocked 14 print changeover cam is coupled and
is rotated 16 by the planet gear of the rotating reduction
gear series. The print gear thus rotates 17 which is
transmitted to the printing mechanism.
Fig. 2-4 Select Mechanism and Print Gear Series
686710D Service Manual 2-5
Paper feeding gear series (See Figs. 2-2 and 2-5.)
As shown in Fig. 2-5, the paper feeding gear series
consists of the paper feed ratchet wheel, paper feed
drive gear assembly, paper feed transmission gear,
and paper feed gear.
During column selection or consecutive paper feeding,
although the select mechanism and printing gear
series will operate through lengthening the Trigger Coil
Drive signal at the first column during space selection,
the return lever and trigger lever are in the unlocked
status 18 in order to maintain a long operating status
of trigger plate and trigger lever.
When the print changeover cam rotates, because the
cam controlling the return lever reaches a notched
section, the return lever is released and begins
operating 19 due to spring force, and its interlocking
with the paper feed ratchet in the paper feed drive
gear assembly is cancelled 20.
Selective gear assembly
The paper feed ratchet operates 21 due to spring force,
and meshes with the teeth of the paper feed ratchet
wheel which is on the same shaft as the selective gear .
When the printing operation is completed, the print
changeover cam causes the selective pawl to return
to its pre-selection status, and the print changeover
cam is stopped. When the selection gear begins
rotation, the paper feed driver gear assembly 22, paper
feed transmission gear 23 and paper feed gear 24 all
rotate together with the paper feed ratchet wheel, which
is transmitted to the paper feeding mechanism.
Fig. 2-5 Paper Feeding Gear Series
2.2.2 Detector Mechanism
(See Fig. 2-6.)
The detector mechanism consists of the detector
assembly and the detector gear. The detector employs
a mechanical contact-point system and generates a
Timing signal "T" and Sub-Timing signal "t" in
correspondence to each character position on the print
wheel.
The detector also generates a signal Reset signal at
each rotation of the print wheel. W av eform rectification
of these signals is to be performed by the user to use
as Timing pulses or Reset pulses.
Fig. 2-6 Detector Mechanism
2-6 Service Manual 686710D
2.2.3 Printing Mechanism
The printing mechanism performs two functions: the
printing operation and carrying operation.
Printing operation (See Fig. 2-7.)
When the print gear series (see subsection 2.2.1,
Transmission/Select Mechanism) causes the print
shaft and print cam to rotate in the ➡ arrow 1 and 2
directions, the hammer transmission lever assembly
and hammer rotates in the ➡ arrow 3 and 4 directions;
therefore, the print wheel is pressed in the ➡ arrow 5
direction by the hammer, and printing is performed.
The hammer return spring moderates the pressure of
printing and also functions to restore the hammer and
hammer transmission lever assembly to standby
status at the completion of printing. The print wheel,
similar to the print changeover cam, makes one
rotation with each printing operation, and the printing
operation is performed during the first half of the
rotation.
Fig. 2-7 Printing Operation
686710D Service Manual 2-7
Carrying operation (See Fig. 2-8.)
The carrying operation is performed after the printing
operation during the last half of the print shaft rotation.
As soon as the positioning plate causes the print gear
to begin rotating, the cam section of the print gear
causes its meshing with the return lever to be
unlocked, and the print gear meshes with the print
cam.
When the print shaft rotates in the ➡ arrow 1 direction,
the meshing between the teeth of the print cam and
positioning plate causes the print shaft to slide to the
➡ arrow 2 direction while rotating in the ➡ direction
while in the ➡ arrow 3 direction. Sim ultaneously with
this sliding action, the carrying operation of the
carriage unit is performed (➡ arrow 4).
Print wheel assembly
Fig. 2-8 Carrying Operation
2-8 Service Manual 686710D
2.2.4 Inking Mechanism
(See Fig. 2-9.)
The ink roll assembly is constantly pressed lightly
against the outer periphery of the pr int wheel due to
the operation of the ink roll spring.
When the print wheel rotates, the ink roll also rotates
and the ink is supplied.
2.2.5 Paper Feeding Mechanism
The paper feeding mechanism performs two functions:
the carriage return operation and the paper feeding
operation.
Carriage return operation (See Fig. 2-10.)
The paper feeding gear series (see subsection 2.2.1,
“Transmission/Select Mechanism”) causes the return
lever to drop into the cam section of the print changeover cam so that it meshes with the positioning plate
(➡ arrows 1 and 2). The rotation of the print
changeover cam restores the return lev er to its original
position (➡ arrow 3) and rotates the positioning plate
with which it is meshed (➡ arrow 4). As a result, the
teeth of the positioning plate and print cam become
disengaged (5), and the spring force of the print wheel
spring and carriage spring causes the carriage to be
returned (➡ arrow 6).
Fig. 2-9 Inking Mechanism
Fig. 2-10 Carriage Return Operation
686710D Service Manual 2-9
Paper feeding operation (See Fig. 2-11.)
Paper feeding is executed while the paper feed drive
gear assembly performs one rotation. When the paper
feeding gear series (see subsection 2.2.1,
"Transmission/Select Mechanism") causes the paper
feed gear to rotate in the ➡ arrow 1 direction, the paper
feed rubber within the platen also rotates in the ➡
arrow 2 direction, and the paper is f ed by friction from
Fig. 2-11 Paper Feeding Operation
the paper hold roller, which is in contact with the paper
feed rubber.
When the paper feed ratchet within the paper feed
drive gear assembly strikes the return lever, it
becomes disengaged with the paper feed ratchet
wheel, the rotation of the paper feed drive gear
assembly is stopped, and paper feeding is terminated.
2.2.6 Printer Operation During One Print
Cycle Initialization
To confir m that the carriage is in standby status (at
the first column), initialization must be performed prior
to printing and paper feeding. Initialization is completed
performing line feed.
Printing of the first line
1
The Timing pulses
Motor Drive signal is applied and the motor is
activated. The Reset pulse "RP" appearing 8 Timing
pulses shall be regarded as "RPo" and the first
Timing pulse "TP" after the rising of "RPo" shall be
regarded as "TPo".
2
Character selection (First column)
The Trigger Coil drive pulse is applied to the trigger
coil during the interval from Timing pulse "TPn" to
"TPn+1” which correspond to the desired character.
At such time, the Timing pulse interval ("TPn" to
"TPn+1”) is measured to obtain "TW1”. Following
character selection, the print wheel stops (the
timing pulse retains the "TPn+1” status), then print
and carrying are automatically executed.
3
Character selection (second column)
The print wheel starts rotating again and the first
Timing pulse is TP12. Character selection can be
performed from the next Timing pulse TP13. The
rest of this character selection operation is identical
to that described in Step (2) above.
"TP" are counted after the
4
Carriage return and paper feeding
During character selection for the highest-order
column of a line of print, printing, carriage return,
and paper feed are performed by adding: [the
width of the drive pulse to the trigger coil] + [the
timing pulse interval TW2 (TPn to TPn+1) at the
time] + [(the TP interval TW1 measured during
selection of the 1st column) x 6].
5
Motor OFF
After completing the printing of the highest-order
printing is one line of printing, the print wheel
begins rotation and the Timing pulse "TP" is
generated. Counting from this initial rising pulse,
the Motor Drive signal is cut off at the rising of the
fourteenth Timing pulse "TP".
NOTES:
• During a one-line print cycle, confirm the Reset
pulse "RP" between Timing pulses "TP13" and
"TPo" or "TPo" and "TP1”.
• The first Timing pulse that is generated after the
print column-shift process (TPn"2) cannot be used
for character selection.
2-10 Service Manual 686710D
Consecutive printing
Fast paper feeding
1 The process for the initial line is similar to that for
"Printing of the first line".
2 Printing of the second and later lines begins as
follows: After completing the printing of the highestorder column for printing of the first line, with the
motor remaining driven, count the following Timing
pulses "TP". From the rising of the 29th Timing
pulse, pinting of the first column of the second line
becomes possible. Next, follow Steps 2 to 4 of
"Printing of the first line".
3 Consecutive printing is performed by repeating
Step 2 above.
4 Motor OFF
Perform Step 5 of "Printing of the first line".
Paper feeding of the first line
1 The Timing pulses "TP" are counted after the
Motor Drive signal is applied and the motor is
activated. The Reset pulse "RP" appearing 8
Timing pulses shall be regarded as "RPo" and the
first Timing pulse "TP" after the rising of "RPo"
shall be regarded as "TPo".
1 The process for feeding the initial line is similar to
that for "Paper feeding of the first line".
2 Paper feeding of the second and later lines begins
as follows: After completing the paper feeding of
the first line, with the motor remaining driven,
count the following Timing pulses "TP". From the
rising of the 21st Timing pulse, selection of the
empty character "TP10" becomes possible. Next,
follow Step 2 of "Paper feeding of the first line".
3 Fast paper feeding is performed by repeating Step
2 above.
4 Motor OFF
Perform step 3 of "Paper feeding of the first line".
2 Paper feeding
Select the empty character "TP10". At such time,
measure the Timing pulse interval "TP10" to "TP11”
to obtain TW1. When the width of the Trigger Coil
Drive pulse equals the measured "TW1” plus six
times "TW1”, the empty character on the print
wheel is selected and paper feeding is performed.
3 Motor OFF
After completing the paper feeding of one line, the
print wheel begins rotation. Counting from the
initial rising Timing pulse, the Motor Drive signal is
cut off at the rising of the fourteenth Timing pulse
"TP".
NOTE:
• During a one-line print cycle, confirm the Reset
pulse "RP" between Timing pulse "TP13" and
"TPo" or "TPo" and "TP1”.
686710D Service Manual 2-11
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3. HANDLING, MAINTENANCE, AND
REP AIR
3.1 HANDLING THE PRINTER
3.1.2 Paper Setting
Loading the Paper
When loading the paper into the printer, note the
following points.
3.1.1 Precautions on Printer Handling
Precautions on transport (See Fig. 3-1.)
(1)When transporting this printer, never carry it by
grasping only the jumper lead.
(2)Never expose the printer to impact by dropping or
striking it, placing two printers into contact or
similar means.
Paper Setting Procedures (See Fig. 3-2.)
Fig. 3-2 Paper Setting Procedures
The Leading Edge of Rolled Paper (See Fig. 3-3.)
Fig. 3-3 The Leading Edge or Rolled Paper
Fig. 3-1 Proper Handling of Printer
Precautions on storage
• Avoid storage in locations exposed to excessive
dirt or dust, direct sunlight or excessive moisture.
• In the case of long-term storage (over 1 month),
place the printer a polyethylene bag after wrapping
it in anti-rust (VPI) paper, then store it in a dry
location.
Precautions on use
• Since this printer employs a permanent magnet
(motor section), avoid using it in locations exposed
to excessive iron filings, dirt, dust or other foreign
particles.
• Never perform a printing operation without the
paper and ink roller installed.
• Make sur you use only the paper and ink roll
assembly that are stipulated in the specifications.
• The ink roll assembly is a disposable part; do not
attempt to refil its ink supply.
Precautions on paper insertion
• Insert the paper straight into the paper entrance
section. Never insert paper having an uneven
leading edge at a slant.
• If the paper is pushed in the direction of feeding,
paper insertion will be simplified.
Removing the Paper
Remove the paper by following on the two methods
below.
• Perform paper feed using an electrical operation
(switch the printer power to ON, then press the
Paper Feed button), then remove the paper.
• Although the paper release mechanism in standby
status allows the paper to be freely removed by
pulling it out towards the front or back, make sure
to pull it straight out of the printer. Pulling the
leading edge out at a slant causes paper
jamming.
686710D Service Manual 3-1
3.1.3 Installating the Ink Roll Assembly
3.2 MAINTENANCE
Fiting the Ink Roll Assembly (See Fig. 3-4.)
• Set the ink roll assembly in the cutout sections of
the carriage, then press it down gently until it clicks
into place.
Fig. 3-4 Installation of Ink Roll Assembly
Replacement of ink roller assembly
(See Fig. 3-5.)
• Press the knob of the ink roll assembly in the ➡
arrow direction, then lift the ink roll assembly up
and out of the carriage.
To ensure this printer retains its initial performance
level throughout a long product life, and to prevent
potential troubles, be sure to perform maintenance
and management according to the points described
in the following subsections.
3.2.1 Cleaning
Eliminating dirt or stains
Wipe off the soiled sections using alcohol or benzene.
Eliminating dust, scraps, and other foreign
particles
Use a vacuum cleaner to carefully draw out all f oreign
particles from every par t of the printer.
NOTES:
Never use thinner , tricholyene nor k etone solvents as
they may deteriorate or damage the plastic parts.
Check the remaining lubricant of each cleaned section
and perform lubrication as required. (See subsection
3.3.3, “Lubrication Points”.)
3.2.2 Inspection
Fig. 3-5 Replacement of Ink Roller Assembly
The maintenance and check-up procedures for this
printer are grouped into two types:
1) Daily checks that can be easily performed by the
operator of the printer during the course of daily
work, and
2) Periodic checks that can be performed only by
persons having a thorough understanding of the
printer mechanisms. These maintenance and
check procedures should be implemented
according to the technical level of the person
conducting them.
3-2 Service Manual 686710D
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