Olivetti CMS-140B Service Manual

Cash Register

CMS 140 B

SERVICE MANUAL

PUBLICATION ISSUED BY:

Olivetti Lexikon, S.p.A.
Documentazione
77, Via Jervis - 10015 Ivrea (Italy)

Copyright © 1998, by Olivetti
All rights reserved

PREFACE

This manual is addressed to the field engineers who will install and service the CMS 140B cash register.
It provides all the information needed for a correct product maintenance.

SUMMARY

This manual is divided into seven 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, 6 and 7 describe the electronic

circuitry, schematics and diagram and assembly construction.

PREREQUISITES

The topics described in this manual require knowledge of similar products.

REFERENCE DOCUMENTA TION

Instruction Manual - (provided with the product)
Spare Parts Catalogue

DISTRIBUTION: General

FIRST EDITION: December 1998

686770R Service Manual iii

CONTENTS

1.OVERVIEW.................................. 1-1

1.1 TECHNICAL SPECIFICATIONS..... 1-2

2.SPECIFICATIONS AND

OPERATING PRINCIPLES......... 2-1

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/Select Mechanism 2-3

2.2.2 Sensor Mechanism................... 2-7

2.2.3 Printing Mechanism.................. 2-8

2.2.4 Inking Mechanism..................... 2-9

2.2.5 Paper Feeding Mechanism....... 2-10

2.2.6 Print Cycle Initialization............. 2-12

3.HANDLING, MAINTENANCE....... 3-1

3.1 HANDLING THE PRINTER........... 3-1

3.1.1 Precautions on Printer Handling 3-1

3.1.2 Paper Installation...................... 3-2

3.1.3 Ink Roller Installation................ 3-3

3.2 MAINTENANCE............................. 3-4

3.2.1 Cleaning.................................. 3-4

3.2.2 Inspection................................. 3-4

3.3 LUBRICATION............................... 3-4

3.3.1 Lubricant Types....................... 3-4

3.3.2 Lubrication Points.................... 3-4

3.3.3 List of lubricants....................... 3-4

3.4 PROBLEM RESOLUTION.............. 3-5

3.5 PRINTER PIN ASSIGNMENTS...... 3-7

3.6 TIMING CHART.............................. 3-9

4.DISASSEMBLY PROCEDURE/HOW
TO LOCATE THE ASSEMBLIES 4-1

4.1 HOW TO LOCATE THE POWER

ASSEMBLY.................................... 4-1

4.2 THE REMOTE BATTERIES/

LOCATION OF ON/OFF SWITCH. 4-2

4.3 MACHINE DISASSEMBLY -

REASSEMBLY............................... 4-3

4.3.1 Machine Case........................... 4-3

4.3.2 Printer Unit............................... 4-3

4.3.3 Main Board and Display.......... 4-4

4.3.4 Paper Feed Motor.................... 4-4

4.3.5 Battery Compartment............... 4-5

4.3.6 Keypad..................................... 4-5

5.BLOCK STRUCTURE CHART... 5-1

5.1 CIRCUITRY.................................... 5-1

6.SCHEMATICS AND DIAGRAMS 6-1

6.1 SYSTEM BLOCK DIAGRAM.......... 6-1

6.2 POWER SUPPLY CIRCUIT............ 6-2

6.3 RESET CIRCUIT............................ 6-3

6.4 POWER FAIL CIRCUIT.................. 6-3

6.5 DISPLAY CIRCUIT......................... 6-4

6.6 KEYBOARD CIRCUIT.................... 6-5

6.7 BUZZER CIRCUIT.......................... 6-6

6.8 BATTERY CIRCUIT....................... 6-6

6.9 PRINTER CIRCUIT........................ 6-7

6-10 SCHEMATIC DIAGRAM................. 6-9

7.ASSEMBLY CONSTRUCTION... 7-1

686770R Service Manual v.

1. O VERVIEW

Fig. 1-1 Overall View of the Cash Register

686770R Service Manual 1-1

1.1 TECHNICAL SPECIFICATIONS

Type: Electronic cash register with 8 departments
Display: Bright double display with 16x6 mm numbers, error symbol, change, subtotal, minus,

total and quantity

Display capacity: 9 digits
Printer: ECR exclusive serial printer
Paper supply: 57 mm wide wood-free single ply tape
Memory protection: Approx. 3 months after power interruption with 4 1.5 V Mignon batteries
Technology: CMOS RAM
Power supply: AC Adapter

Internal Battery

Line voltage: 220 V

Power consumption: Stand-by 2.2 W; operating 4 W
Operating temperature: 0° to 40° C
Dimensions: Depth 425 mm, Width 325 mm, Height 210 mm
Weight: Approx. 6 Kg

1-2 Service Manual 686770R

2. SPECIFICA TIONS AND
OPERATING PRINCIPLES

2.1 SPECIFICATIONS

2.1.1 FEATURES

Paper (supplied by the user)

Type: Regular paper roll
Size: Width 57.5 mm ± 0.5 mm
Roll diameter: 80 mm or less
Thickness: 0.06 ~ 0.085 mm
Average weight: 47 g/m2 ~ 64 g/m2 (40 ~ 55 kg/

1000 sheets/1091 x 788 mm)

The Micro Printer is designed for use with calculators.
It offers the following features:

• Ultra-compact and lightweight design.

• Movable type for sharp printing quality.

• High printing speed using a mechanism that can

return the carriage from any column position.

• Silent printing.

• Quick feeding and paper free functions.

• Can run on size AAA manganese batteries (low-

power drive).

• Uses ordinary paper.

• Requires no motor speed control.

2.1.2 SPECIFICATIONS

The main printer specifications are listed below.

Print method

Serial printing with movable type

Carriage width

Maximum of 13 printable columns (including 2 symbol
columns)

Character position

On symbol column side: 12 positions + 2 empty

positions

On numeric column side: 14 positions

Character size

1.6 (W) x 2.8 (H) mm

Intercharacter intervals

Between numerics: 2.1 mm
Between a numeric and a symbol: 2.6 mm

Paper feeding

Typically 4.3 Ips. Fast paper feeding is also possible,
and a paper release mechanism is provided.

Inking

Ink roller method
Ink roller life: 700,000 characters
Standard: IR-30 (IR-40 is also applicable)

Motor

Terminal voltage: 6.0 VDC
Average current: Approximately 0.14 A

(during 13-column, 7-character
shift printing at 6.0 VDC,
25°C/77°F)

Sensor

Mechanical point of contact
Reset signal R, Timing signal T, and Sub-timing

signal t

Trigger coil (electromagnet)

Terminal voltage: 6.0 VDC

D.C. resistance: 16.7 Ω (at 25°C/77°F)
Connection method

Jumper wire on printer side

Guaranteed operating temperature

0° - 40°C / 32° - 104°F
(guaranteed printing temperature:
5° - 40°C/41° - 104°F)

Reliability

MCBF: 300,000 columns

Line spacing

4.6 mm

Print speed

Average printing speed at 6.0 VDC, 13-column printing:

Typically 0.7 I/s

6-column printing: Typically 1.4 I/s

686770R Service Manual 2-1

External dimensions

86 (W) x 58.4 (D) x 19 (H) mm
(3.39 (W) x 2.30 (D) x 0.75 (H) inch)

Weight

Approximately 80 g (0.21Ib)

2.1.3 MECHANISMS

This printer consist of two print wheels, a hammer, and
a carriage equipped with an ink roll. It is a serial printer
with movable type, and it prints by sequentially moving
the carriage 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 charged by a signal (corresponding
a character) output from the sensor, a character is
selected, the print wheel stops, the print gear is rotated
by the action of the planet gear, and a character is
printed.

The carriage then shifts to the next column (column­shift operation). When charge to the trigger coil is
extended during character selection at the end of a line,
printing is performed and the carriage is returned to the
initial column. The paper is then fed forward to complete
the printing of one line.

This printer consist of five mechanism: the transmission
and select, defection, print, inking, and paper feeding.

Fig. 2-1 shows an external view of the Micro serial
Printer. For details on the operating principles and
handling of each mechanism, see Subsection

2.2

Operating Principles

and Maintenance

.

, and Chapter 3

Handling

Fig. 2-1 Exterior View

2-2 Service Manual 686770R

2.2 OPERATING PRINCIPLES

2.2.1 TRANSMISSION/SELECT MECHANISM

As shown in Fig. 2-2, this mechanism consists of the reduction gear train, and paper feed gear train.

Fig. 2-2 Transmission/Select Mechanism

686770R Service Manual 2-3

Reduction gear series

(See Fig. 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
rotational force is sequentially reduced from the motor
gear (3) on the same shaft through the gear train to the
selective gear assembly (7).

The rotation of the print changeover cam is locked 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 the detection
wheel also rotate at the same time.

Fig. 2-3 Reduction Gear Series

2-4 Service Manual 686770R

Select mechanism

(See Fig. 2-2 and 2-4)
As shown in Fig. 1-4, the select mechanism consists

of the selective gear assembly, trigger coil, trigger
plate, trigger lever, and selective pawl. The select
mechanism operates 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 sensor, the trigger plate is drawn (10) to the
yoke fixed on the selective gear assembly so that the
trigger plate (11), trigger lever (12), and selective pawl
(13) rotate together with the selective gear assembly.
At the same time as the print changeover cam is
unlocked, the selective pawl locks (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
also is stopped, and the character selected.

Print gear series

(See Fig. 2-2 and 2-4)
The print gear series consists of the print changeover

cam and the print gear. When the selective 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
totalling reduction gear series. The print gear thus
rotates (17) and transmits its movement to the printing
mechanism.

Fig. 2-4 Select Mechanism and Print Gear Series

686770R Service Manual 2-5

Paper feeding gear series

(See Fig. 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
ratchet, paper feed drive gear assembly, paper feed
transmission gear, and paper feed gear.

During column selection or consecutive paper feeding,
the select mechanism and printing gear series operate
by extending the trigger coil drive signal at the first
column during space selection. However, the return
lever and trigger lever are unlocked (18) to maintain the
operation of the trigger plate and trigger lever. When the
print changeover cam rotates, the cam controlling the
return lever reaches a notched section. The return
lever is thereby released and beings operating (19) due
to spring force, and its interlocking with the paper feed
ratchet is cancelled (20).

The paper feed ratchet on the paper feed drive gear
assembly operates (21) due to spring force and
meshes with the teeth of the paper feed ratchet wheel
on the same shaft as the selective gear.

When 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 drive gear assembly (22), paper feed
transmission gear (23), and paper feed gear (24) all
rotate together with the paper feed ratchet wheel. This
movement is then transmitted to the paper feeding
mechanism.

Fig. 2-5 Paper Feeding Gear Series

2-6 Service Manual 686770R

2.2.2 SENSOR MECHANISM

(See Fig. 2-6)
The sensor mechanism consists of the sensor as-

sembly and the sensor gear. The sensor employs a
mechanical contact-point system and generates a
timing signal T and a sub-timing signal t in corre­spondence to each character position on the print
wheel.

The sensor also generates a reset signal at each
rotation of the print wheel. Waveform rectification of
these signals should be performed by the user, as
timing or reset pulses.

Fig. 2-6 Sensor Mechanism

686770R Service Manual 2-7

2.2.3 PRINT ING MECHANISM

The printing mechanism performs two operations:
printing and carriage movement.

Printing operation

(See Fig. 2-7)
When the print gear series (see Subsection 2.2.1,

Transmission/Select Mechanism)

shaft and print cam to rotate in the direction of a
arrows (1) and (2), the hammer rotates in the direction
of ➡ arrow (3).

causes the print

Thus, the print wheel is pressed in the direction of ➡
arrow (4) by the hammer, and printing is performed.

The print wheel, similar to the print changeover cam,
rotates once with each printing operation, and printing
is performed during the first half of the print shaft
rotation.

Fig. 2-7 Printing Operation

Carrying operation

(See Fig. 2-8)
Carrying is performed after printing, during the sec-

ond half of the print shaft rotation. As soon as the
positioning plate begins rotating the print gear, the
cam section of the print gear unlock its meshing the
return lever, and the print gear meshes with the print
cam.

When the print shaft rotates in the direction of ➡ arrow
(1), the meshing between the teeth of the print cam
and the teeth of the positioning plate causes the print
shaft to slide in the direction of ➡ arrow (2) while
rotating in the direction of ➡ arrow (3). The simulta­neously with this carriage unit is carried sliding action
(➡ arrow (4))

Fig. 2-8 Carrying Operation

2-8 Service Manual 686770R

2.2.4 INKING MECHANISM

(See Fig. 2-9)
The ink roller is held lightly against the other periphery

of the print wheel by the force of the ink roller spring.
When the print wheel rotates, the ink roller also

rotates and supplies ink to the wheel.

Fig. 2-9 Inking Mechanism

686770R Service Manual 2-9