NCR 7194 User manual

Brand: NCR

Model: 7194

Type: User manual

NCR 7194 Thermal Receipt

Printer

Release 1.0

Service Guide

B005-0000-1098

Issue D

The product described in this book is a licensed product of NCR Corporation.

NCR is a registered trademark of NCR Corporation.

It is the policy of NCR Corporation (NCR) to improve products as new technology, components, software,

and firmware become available. NCR, therefore, reserves the right to change specifications without prior

notice.

All features, functions, and operations described herein may not be marketed by NCR in all parts of the

world. In some instances, photographs are of equipment prototypes. Therefore, before using this document,

consult with your NCR representative or NCR office for information that is applicable and current.

To maintain the quality of our publications, we need your comments on the accuracy, clarity, organization,

and value of this book.

Address correspondence to:

Manager, Information Products

NCR Corporation

2651 Satellite Blvd.

Duluth, GA 30096

By NCR Corporation

Dayton, Ohio U.S.A.

Service Guide i

Preface

Important Information to the User

In order to ensure compliance with the Product Safety, FCC and CE

marking requirements, you must use the power supply, power cord,

and interface cable, which were shipped with this product or which

meet the following parameters:

Power Supply

UL Listed (QQGQ), Class 2 power supply with SELV (Secondary Extra

Low Voltage), non-energy hazard output, limited energy source, input

rated 100-240 Vac, 1.5/0.8 A, 50/60 Hz, output rated 24 Vdc, 2.3 A.

Use of this product with a power supply other than the NCR power

supply will require you to test this power supply and NCR printer for

FCC and CE mark certification.

Interface Cable

A shielded (360 degree) interface cable must be used with this product.

The shield must be connected to the frame or earth ground connection

or earth ground reference at EACH end of the cable.

Use of a cable other than described here will require that you test this

cable with the NCR printer and your system for FCC and CE mark

certification.

Power Cord

A UL listed, detachable power cord must be used for this product. For

applications where the power supply module may be mounted on the

floor, a power cord with Type SJT marking must be used. For

applications outside the US, power cords, which meet the particular

country’s certification and application requirements, should be used.

Use of a power cord other than described here may result in a violation

of safety certifications, which are in force in the country of use.

ii Service Guide

How to Use This Book

Use this book as a training guide for teaching users how to operate the

printer or as a reference for programming the host computer to

communicate with the printer. In addition, information is also

provided about the character sets and graphics that are available. The

book is divided into chapters that relate to each of these areas.

See the Contents, or Index for detailed listings.

Who Should Use This Book?

This book is intended as a general guide for operators and supervisors

who need to know how to use the printer. It is also intended as a

technical guide for programmers and system integrators who need to

know the technical information about the printer's communication and

the programming commands used by the host computer to control the

functions of the printer.

How to Obtain More Information

For more information about the 7194 printer and to order the following

documentation, please contact your NCR supplier:

•

7194 Thermal Receipt Printer: Owner’s Guide

(B005-0000-1097)

Service and disassembly procedures (you must be a trained service

representative to service the printer)

Service Guide iii

Table of Contents

Chapter 1:

Technical Specifications

Reliability ...............................................................................................1-1

Power Requirements.............................................................................1-2

Environmental Conditions ..................................................................1-3

Dimensions and Weight.......................................................................1-4

Printing Specifications..........................................................................1-5

Density of Receipt Print Lines.............................................................1-6

Duty Cycle Restrictions (Printing Solid Blocks) ...............................1-7

Allowable Duty Cycle (measured over one minute of

continuous printing) ......................................................................1-8

Chapter 2:

Diagnostics and Configuration

Startup Diagnostics...............................................................................2-2

Runtime Diagnostics.............................................................................2-3

Remote Diagnostics ..............................................................................2-4

Indicators................................................................................................2-7

Printer Configuration ...........................................................................2-9

Configuring the Printer................................................................2-11

Communication Interface............................................................2-14

RS-232C Serial Interface Settings................................................2-14

Printer Emulations........................................................................2-16

Printer Settings and Functions....................................................2-16

Enable or Disable Data Scope Mode..........................................2-19

Printhead Resistance....................................................................2-21

Chapter 3:

Troubleshooting

Service Level Troubleshooting............................................................3-1

Printer Tone and Green LED ........................................................3-1

iv Service Guide

Printing Problems...........................................................................3-2

Printer Does Not Function ............................................................3-5

Chapter 4:

Servicing the Printer

Tools Required.......................................................................................4-1

Service Procedure Map.........................................................................4-2

1, 2: Removing or Accessing the PC Control Board.........................4-3

Procedure.........................................................................................4-4

Re-installing the Control PC Board..............................................4-7

3, 4: Removing the Options PC Board................................................4-9

Procedure.........................................................................................4-9

Re-installing the Options PC Board...........................................4-10

5, 6: Removing the Rear Cover and Platen......................................4-11

Procedure.......................................................................................4-11

Re-installing the Rear Cover and Platen ...................................4-12

7: Removing the Platen/Fixed Knife Carrier Assembly................4-13

Procedure.......................................................................................4-14

Fixed Knife Blade/Platen-Carrier Assembly Removal.......4-15

Re-installing the Knife .................................................................4-15

8, 9, 10, 11: Removing the Top Cover Assembly, Paper Feed

Rod/Light Pipe, Reset Rod, and Paper Feed Button .....................4-16

Procedure (See illustration next page.)......................................4-16

R ......................................................................................................4-18

12: Removing the Paper Low Sensor/Mount .................................4-19

Procedure (See illustration next page.)......................................4-19

Re-installing the Paper Low Sensor/Mount.............................4-21

13: Removing the Thermal Mechanism ...........................................4-22

Procedure.......................................................................................4-22

Re-installing the Thermal Mechanism.......................................4-25

14, 15, 16: Removing the Paper Out Switch, Knife Home

Switch, and Cover Open Switch .......................................................4-26

Procedure.......................................................................................4-26

Service Guide v

Re-installing the Paper Out Switch, Knife Home Switch,

and Cover Open Switch...............................................................4-27

17: Removing the Rotating Knife Blade...........................................4-28

Procedure.......................................................................................4-28

Re-installing the Rotating Knife Blade ......................................4-29

Cleaning the Printer............................................................................4-30

Cleaning the Printhead................................................................4-30

Revision Record

Issue Date Remarks

A Nov 98 First issue

B Mar 99 Updated

C June 99 Minor updates

D June 00 Updates

vi Service Guide

Radio Frequency Interference Statements

Federal Communications Commission (FCC)

Information to User

This equipment has been tested and found to comply with the limits for a Class A

digital device, pursuant to Part 15 of FCC Rules. These limits are designed to provide

reasonable protection against harmful interference when the equipment is operated in

a commercial environment. This equipment generates, uses, and can radiate radio

frequency energy and, if not installed and used in accordance with the instruction

manual, may cause harmful interference to radio communications. Operation of this

equipment in a residential area is likely to cause interference in which case the user

will be required to correct the interference at his own expense.

NCR is not responsible for any radio or television interference caused by unauthorized

modification of this equipment or the substitution or attachment of connecting cables

and equipment other than those specified by NCR. The correction of interference

caused by such unauthorized modification, substitution or attachment will be the

responsibility of the user. The user is cautioned that changes or modifications not

expressly approved by NCR may void the user’s authority to operate the equipment.

Canadian Department of Communications

This digital apparatus does not exceed the Class A limits for radio noise emissions

from digital apparatus set out in the Radio Interference Regulations of the Canadian

Department of Communications.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les

limites applicables aux appareils numériques de la classe A prescrites dans le

Règlement sur le brouillage radioélectriques édicté par le ministrère des

Communications du Canada.

Voluntary Control Council For Interference (VCCI)

Chapter 1:

Technical Specifications

Reliability

Thermal mechanism

45 Million Lines

Knife

1.5 Million Cuts

1-2 Chapter 1: Technical Specifications

Power Requirements

The printer receives power either from the host system (integrated) or

from a separate in-line power supply (remote) which can be purchased

separately

Power from Host (Integrated)

Voltage 24 Vdc ± 10%

+5 Volts for Logic Circuits

Amps 2 Amps Maximum Current Draw

Power from Power Supply (Remote) 55 Watts

Voltage 24 Vdc ± 10%

+5 Volt Supply for the Logic Circuits

Amps

Short Term (under 1ms)

25% Dot Coverage

9.0A Peak

2.3A Average

Power from Power Supply (Remote) 75 Watts

Voltage 24 Vdc ± 10%

+5 Volt Supply for the Logic Circuits

Amps

Short Term (under 1ms)

50% Dot Coverage

12.0A Peak

3.1A Average

Chapter 1: Technical Specifications 1-3

Environmental Conditions

Without Knife

Operating Temperature

Operating Humidity

5°C to 35°C (41°F to 95°F)

5% to 90%

35°C to 50°C (95°F to

122°F)

5% to 40%

With Knife

Operating Temperature

Operating Humidity

5°C to 28°C (41°F to 82°F)

10% to 90%

28°C to 45°C (82°F to

113°F)

10% to 35%

Storage Temperature

Storage Humidity

-10°C to 50°C (14°F to 122°F)

5% to 90%

Transit Temperature

Transit Humidity

-40°C to 60°C (-40°F to 140°F)

5% to 95%

Condensation

Condensation may occur when the printer is moved

from cold to warm areas after shipment. The printer's

design permits operation after drying out and

stabilizing at room temperature.

1-4 Chapter 1: Technical Specifications

Dimensions and Weight

Height

135 mm (5.34 inches)

Height with cover open

216 mm (8.53 inches)

Width

144 mm (5.66 inches)

Depth

184 mm (7.24 inches)

Weight

1.3 kg (2.9 pounds)

Chapter 1: Technical Specifications 1-5

Printing Specifications

Speed

38.4 Lines per Second (Standard Spacing)

Printhead

Direct Thermal, Fixed Head, 640 Dots

(576 Addressable – 80.0 mm) (640 Addressable –

82.5 mm)

Paper Feed

130 mm per Second (Maximum)

1-6 Chapter 1: Technical Specifications

Density of Receipt Print Lines

This function makes it possible to adjust the energy level of the

printhead to darken the printout. An adjustment should only be made

when necessary. The factory setting is 100%.

Caution:

Choose an energy level no higher than necessary to achieve

a dark printout. Failure to observe this rule may result in a printer

service call or voiding of the printer warranty. Consult your NCR

technical support specialist if you have any questions.

When the printer prints high density print lines (text or graphics), it

automatically slows down.

To change the Print Density:

Enter the Configuration Menu.

Select “Set Hardware Options” from Main Menu.

“Hardware Options Menu” is printed on the receipt and the

question “Set Print Density?” asked.

Answer YES (Long click).

A warning is printed, followed by:

Print Density

100% 1 Click

110% (+) 2 Clicks

120% (++) 3 Clicks

Enter code, then hold Button DOWN at least 1 second to validate.

Chapter 1: Technical Specifications 1-7

Duty Cycle Restrictions (Printing Solid Blocks)

There are restrictions on the duty cycle because of the heat generated

by the thermal printhead when printing solid blocks (regardless of the

length of the block in relation

to the print line). The restrictions are ambient temperature, the

percentage of time (measured against one minute) of continuous solid

printing, and the amount of coverage.

Caution:

When the duty cycle approaches the limits shown in the

table, the receipt printhead will heat up and shut down. This may

damage the printhead.

To avoid this problem, do one or a combination of the following:

Reduce the amount of coverage.

Reduce the time of continuous solid printing.

Reduce the ambient temperature.

1-8 Chapter 1: Technical Specifications

Allowable Duty Cycle (measured over one minute of

continuous printing)

Amount of Solid Coverage Ambient Temperature

25°C35° C50° C

20% 100% 50% 20%

40% 50% 25% 10%

100% 20% 10% 4%

For reference:

•

A typical receipt with text (contains some blank spaces) is

approximately 12% dot coverage.

•

A full line of text characters (every cell on the line has a character in

it) is approximately 25% dot coverage.

•

Graphics are approximately 40% dot coverage.

•

Barcodes are approximately 50% dot coverage.

•

A solid black line is 100% dot coverage.

Chapter 2:

Diagnostics and Configuration

The following diagnostic tests are available. See the sections that follow

for more information.

•

Startup Diagnostics

Performed during the startup cycle.

•

Runtime Diagnostics

Performed during normal printer operation.

•

Remote Diagnostics

Maintained during normal operation and printed in the print test.

The printer can be configured with the following settings and functions

through the Configuration Menu that is printed on the receipt. See

“Printer Configuration” in this document for more information.

•

Communication Interfaces

•

RS-232C Settings

•

Printer Emulations

•

Printhead Resistance

•

Datascope Mode

2-2 Chapter 2: Diagnostics and Configuration

Startup Diagnostics

When the printer receives power or performs a hardware reset, it

automatically performs the Startup Diagnostics (also known as Level 0

Diagnostics) during the startup cycle. The following diagnostics are

performed:

•

Turn off motors

•

Perform boot CRC check of the firmware ROM, test external

SRAM, test EEPROM, and test main program CRC

Failure causes Startup Diagnostics to stop; the printer beeps and

the LED flashes a set number of times, indicating the nature of the

failure. See the table in the “Indicators” section later in this

document for the tone and LED sequences.

•

Check if paper is present

•

Return the knife to the home position

Failure causes a fault condition. See the table in the “Indicators”

section later in this document for the tone and LED sequences.

•

Check if receipt cover is closed

Failure does not interrupt the startup cycle.

When the Startup Diagnostics are complete, a two-tone beep (low then

high frequency) is heard, the Paper Feed Button is enabled and the

printer is ready for normal operation.

If the printer has not been turned on before, or a new EEPROM has

been installed, the default values for the printer functions will be

loaded into the EEPROM during Startup Diagnostics.

Chapter 2: Diagnostics and Configuration 2-3

Runtime Diagnostics

Runtime Diagnostics (sometimes called Level 2 Diagnostics) run

during normal printer operation. When the following conditions occur,

the printer automatically turns off the appropriate motors and disables

printing to prevent damage:

•

Paper out

•

Cover open

•

Knife unable to home

•

Printhead too hot

•

Voltages out of range

The LED on the operator panel will signal when these conditions occur

as well as indicate what state or mode the printer is in.

For more information about See this section

Operator panel LED

NCR 7194 Troubleshooting

2-4 Chapter 2: Diagnostics and Configuration

Remote Diagnostics

Remote diagnostics (sometimes called Level 3 Diagnostics) keeps track

of the following tallies and prints them on the receipt during the print

test. See the sample test printout on the next page. These tallies can be

used to determine the printer’s state of health.

•

Model number

•

Serial number

•

CRC number

•

Number of lines printed

•

Number of knife cuts

•

Number of hours the printer has been on

•

Number of Flash cycles

•

Number of cutter jams

•

Number of times the cover is open

•

Maximum temperature reached

(See tallies note on the following page.)

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NCR 7194 User manual

NCR 7194 User manual

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