NCR 7194 Bedienungsanleitung
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
Copyright © 1999
By NCR Corporation
Dayton, Ohio U.S.A.
All Rights Reserved
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 édictépar 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 fromPower 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 fromPower 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
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