Sharp DP-750 Manuale utente

Serial Dot Matrix

Printer

MODEL DP-750

CHAPTER 1. Printer Handling and Maintenance.............................................1

CHAPTER 2. Specifications and Operation Principles.....................................2

CHAPTER 3. Disassembly and Assembly .....................................................10

CHAPTER 4. Troubleshooting........................................................................29

PARTS GUIDE (PRINTER ASSEMBLY : KI-OB2014RC01)

APPLICATION MODEL : UP-600 ("U" & "A" version)

CONTENTS

Parts marked with " " are important for maintaining the safety of the set. Be sure to replace these parts with specified

ones for maintaining the safety and performance of the set.

SHARP CORPORATION This document has been published to be used

for after sales service only.

The contents are subject to change without notice.

SERVICE MANUAL

INTRODUCTION

This manual explains the operation principles and servicing procedures for the Citizen dot matrix printer DP750 series. It is written for personnel

servicing these printers in the field.

FEATURES

The DP750 series printer are a station printers providing 45 mm x 2 line print capability. Developed for POS/ECR applications, the printers offer the

following features.

•The High-performance 9-pin print head with a print speed of approx 3.0 lines per second ensures high-quality printouts.

•Clamshell design (opening and closing mechanism for the paper feed section) makes paper loading easy and facilitates easier maintenance.

•Pull-type paper transport reduces risk of paper jams.

•Versatile array of options:

Take-up device, paper feed device, validation sensor, receipt/journal near-end sensor.

CONTENTS

>>>>> USE FONT <<<<<

Helvetica/ Helvetica-Condensed/ Century-Schoolbook/ Symbol & OriginalFonts: (RingWorld2/RingFont2/Pa

Symbol/PartsCod)

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CHAPTER 1. Printer Handling and Maintenance ..........1

CHAPTER 2. Specifications and Operation Principles ....2

2-1 General Specifications .............................................2

2-2 Mechanism Outline ...................................................4

2-3 Mechanism and Operation Principles .....................4

2-3-1 Drive Force Transmission Assembly ...................4

2-3-2 Sensor Assembly .................................................4

2-3-3 Print Head Assembly ...........................................5

2-3-4 Paper Feed Assembly .........................................6

2-3-5 Ribbon Cassette Assembly .................................6

2-3-6 Paper Take-up Assembly ....................................7

2-4 Connectors ................................................................8

2-4-1 Terminal Layout ...................................................8

2-4-2 Terminal Functions ..............................................8

2-4-3 Terminal Circuit Diagram .....................................9

CHAPTER 3. Disassembly and Assembly ...................10

3-1 Required Tools .......................................................10

3-2 Disassembly Procedure .........................................10

3-3 Assembly Procedure ..............................................10

3-4 Adjustment ..............................................................23

3-4-1 Print Speed Adjustment .....................................23

3-4-2 Platen/Head Gap Adjustment ............................24

3-4-3 Bi-directional Printing Shift Adjustment .............24

3-4-4 RP/HP Waveform Check ...................................25

3-5 Head Assembly Replacement ...............................26

3-5-1 Disassembly Procedure ....................................26

3-5-2 Assembly Procedure .........................................27

CHAPTER 4. Troubleshooting ........................................29

4-1 Repair Procedure ...................................................29

4-2 Repair Steps ...........................................................29

CHAPTER 1. Printer Handling and Maintenance

(1) If printer paper other than the recommended

paper is used, print quality and service life

cannot be guaranteed.

(2) Protect the head surface from mechanical

shocks and from foreign objects.

(3) Remove any contamination from the print

head surface by lightly wiping with a cotton

swab moistened with ethanol or similar product.

(4) During transport and during extended

periods of non-use, remove the ribbon

cartridge.

(5) If the print head is powered while

condensation is present, the head may be

destroyed.

Make sure that any condensation has been

fully dried before starting to print.

(6) Loading paper

Cut the tip of the paper in a straight line and

make sure that the paper is not frayed, folded,

or creased.

When the paper emerges from above the

print head, grasp it and pull it out slightly, to

verify that it is set straight.

(7) Removing paper

Remove the paper only after printer operation

has ceased.

Pull the paper straight out in the same direction

which it emerges from the printer.

Make sure that the paper width and quality

are within specifications.

o: correct

u : incorrect

Printing method

Printing direction

Printing speed

Serial impact dot matrix printer

Bi-directional printing

Approx. 3.0 lines/second m10%

Receipt side: 108 dots/216 positions

Journal side: 108 dots/216 positions

Validation: 248 dots/495 positions

7 x 7 or 7 x 9 (half-dot)

Receipt: 24

Journal: 24

Validation: 55 (1line)

1.36 (W) x 2.4 (H) mm (7 x 7 dots)

1.36 (W) x 3.1 (H) mm (7 x 9 dots)

1.59 mm

Friction feed, separate for receipt and journal

4.23 mm m10% (1/6 inch)

Approx. 30.0 lines/second

Dedicated ribbon cartridge (monochrome: purple)

Ø 0.3 mm

H: 0.176 mm, V: 0.353 mm

Photo interruptor

Micro switch

24.0 V DC m10%

34 ohms m10% (at 25

˚C

)

24.0 V DC m10%

8.25 ohms m10% (at 25

˚C

)

DC brush motor

24.0 V DC m10%

Approx. 1.6 A

Approx. 250 mA

CHAPTER 2 . Specifications and Operation Principles

2-1 General Specifications

Rating RemarksItem

24.0 V DC, 25

C, continuous printing

Character spacing: 2 positions

Option

At startup with 24.0 V DC, 25

During continuous

printing with 24.0 V DC,

25˚C

Total number of dots

Basic character configuration

Basic number of columns

Character dimensions

Column spacing

Paper feed principle

Paper feed pitch

Fast-forward speed

Number of wires

Wire diameter

Wire pitch

Dot pulse

Reset pulse

Home position

Validation

Near end

Drive voltage

Resistance

Drive voltage

Resistance

Type

Drive voltage

Peak current

Average current

Print format

Paper feed

Print head

Detection

functions

Paper feed

solenoid

Print solenoid

Motor

Inking

Printer paper Width: 44.5 0.5 mm, outer diameter: max. Ø 83 mm

135 - 210 mm (W) x min. 70 mm (H) Single-line validation

Rating RemarksItem

Roll paper

Validation paper

Service life

Ambient

conditions

Built-in

Pin connector

MCBF 4 million lines, maximum 8 million lines

100 million characters (2 million dots/pin)

Temperature: 0 to 50˚C

Humidity: 10-90% RH, above 39˚C equivalent to 40˚C 85% RH

Temperature: -25 to +70˚C

Humidity: 40˚C 90% RH, 96 hours

150 (W) x 230.3 (D) x 150.7 (H) mm (Type A)

150 (W) x 234.6 (D) x 123.7 (H) mm (Type B)

Approx. 1180 g

No condensation

To be stored with ribbon

cartridge removed

Including take-up

device

Mechanism

Head

Operation

environment

Storage

environment

Take-up device

Connection principle

Dimensions

Weight

Motor assembly

Dot pulse sensor

(

)

Home position sensor (HP)

Main PCB assembly

Carria

Head assembly

Reset pulse sensor (RP)

Main PCB assembly

2-2 Mechanism Outline

The mechanism of this printer can be divided

into 9 blocks.

• Drive force transmission assembly

• Sensor assembly

• Print head assembly

• Paper feed assembly

• Ribbon cassette assembly

• Paper take-up assembly

Motor assembly

Motor gear

Reduction gear 1

Reduction

gear 2 Reduction

ear 3

Reduction

gear 4

PF gear Winder

pulley

Idling gear 2

Idling gear 1

Bevel gear 2

Bevel gear 1

Worm wheel

• Frame

• Motor assembly

For information on peripheral circuitry

connected to this printer, please refer to the

respective documentation.

2-3 Mechanism and Operation

Principles

This section explains the construction and

operation of 8 out of the 10 blocks listed above

(excluding the frame and motor assembly).

2-3-1 Drive Force Transmission Assembly

The drive force of the motor assembly is

transmitted to the various parts as follows. Print

head via bevel gear, Paper feed, via PF gear,

Ribbon cassette via worm wheel, Paper take-up

assembly via winder pulley.

2-3-2 Sensor Assembly

The sensor assembly is comprised of 3 sensors;

the dot pulse sensor (DP), home position sensor

(HP) and reset pulse sensor (RP).

(1) Dot pulse sensor/home position sensor

(2) Reset pulse sensor

Carriage drive pulley

Head assembly Carriage

Timing belt assembly

Carriage drive gear

Bevel

ear 1 Bevel gear 2

Carriage drive pulley

2-3-3 Print Head Assembly

(1) Print control

Printing is carried out by the print head

comprising of 9 solenoids and moving from left

to right. The print timing is controlled by the

home position sensor (HP), dot pulse sensor

(DP), and reset pulse sensor (RP).

Powered

DP Dot pulse sensor

RP Reset pulse sensor

Powered

HP Home position sensor

Print head Print solenoid #1

Print solenoid #2

Print solenoid #3

Print solenoid #4

Print solenoid #5

Print solenoid #6

Print solenoid #7

Print solenoid #8

Print solenoid #9

(2) Head drive assembly

(3) Print head drive assembly

Print wire

Wire spring

Armature stopper

Solenoid assembly

Armature springNose assembly Armature

PF solenoid

assembly

PF armature

PF roller

assembly

PF gear

Idlin

ear 2

PF latches

Pressure rollers

2-3-4 Paper Feed Assembly

(1) Paper feed mechanism

Ribbon cassette

Ribbon drive shaft Worm wheel

Reduction

ear 1

Ribbon drive gear

2-3-5 Ribbon Cassette Assembly

(1) Ribbon cassette feed mechanism

Winder pulleys

Winder timing belt

Idle gear 2

Spool gear

Spool holder assembly

Spool

2-3-6 Paper Take-up Assembly

(1) Paper take-up mechanism

(2) Near-end detection mechanism

(3) Take-up mechanism types

Type which is the same height as the main unit

Type which is lower than the height of the main unit

Microswitch

Roll paper

End switch leverSwitch holder

Roll paper core

hole center

(when diameter is large)

Roll paper core

hole center

(when diameter is small)

2-4-2 Terminal Functions

no. Terminal name Function

Print solenoid #3

Motor (-) VM COM.

Print solenoid #7

Motor on/off signal

Print solenoid COM.

Home position sensor output

Print solenoid COM.

Dot pulse sensor output

Print solenoid #5

Motor (+)

Print solenoid #2

—

Print solenoid #1

—

Print solenoid #9

Print solenoid COM.

—

Print solenoid #8

Paper feed solenoid (J)

Print solenoid #4

Paper feed solenoid (R)

Print solenoid COM.

GND

Print solenoid #6

Reset pulse sensor output

—

+5 V

VM COM.

+VM (+24 V)

Multi-line validation

SOL. (option)

2-4 Connectors

2-4-1 Terminal Layout

Connector type

Printer side: Molex 5342-30T2

Host side: Molex 5320-30AT2

Pin arrangement diagram

Indice

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