Schiller AT-102 Service Handbook

AT-102 ECG Recorder Service Handbook

Contents

AT-102

12-Channel ECG Recorder

Service Handbook

Article Number 2. 540 028

SCHILLER AG 2002

SCHILLER AG

Altgasse 68

6341 Baar, Switzerland

Phone: + 41 41 766 42 42

Fax: + 41 41 761 08 80

www.schiller.ch

i

SCHILLER

AT-102 ECG Recorder Service Handbook

AT-102 Service handbook

Article Number 2. 540 028

Release a

November 2002

Associated Documents

 Physicians Guide to the SCHILLER Interpretation and Measurement Program

 AT-102 User Guide

The SCHILLER sales and service centre network is worldwide. For the address of your local

distributor, contact your nearest SCHILLER subsidiary. In case of difficulty a complete list of all

distributors and subsidiaries is provided on our internet site:

http://www.schiller.ch

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AT-102 ECG Recorder Service Handbook

The AT-102 is a 12-channel ECG device used for the recording, analysis and

evaluation of ECG Recordings. Recordings made with the AT-102 can be used as a

diagnostic aid for heart function and heart conditions. The AT-102 is designed for

indoor use and can be used for all patients of both sexes, all races, and all ages.

Physician`s Responsibility

Contents

Intended Use

The AT-102 ECG Unit is provided for the exclusive use of qualified physicians or

personnel under their direct supervision. The numerical and graphical results and

any interpretation derived from a recording must be examined with respect to the

patient`s overall clinical condition. Patient preparation and the general recorded data

quality, which could affect the report data accuracy, must also be taken into

account.

It is the responsibility of the physician to make the diagnosis or to obtain expert

opinion on the results, and to institute correct treatment if indicated.

FEDERAL LAW IN THE USA RESTRICTS THIS DEVICE TO SALE BY OR

ON THE ORDER OF A PHYSICIAN

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AT-102 ECG Recorder Service Handbook

AT-102

Service Handbook

Contents

Intended Use...................................................................................iii

Physician`s Responsibility...............................................................iii

Terms of Warranty ......................................................................................... x

Disposal Instructions and Battery Care ..................................................... xi

Safety Notices ................................................................................xii

Operational Precautions ............................................................................. xii

Precautions for Operation with other Devices ......................................... xiii

Maintenance Precautions ..........................................................................xiv

Symbols and Conventions Used in this Service handbook ........... xv

What's in this book ........................................................................ xvi

Section 1 Operating Elements ............................ 1.1

Introduction .................................................................................. 1.2

Features .......................................................................................................1.2

Operating Philosophy Overview ...............................................................1.3

Initiating Functions or Tasks ..................................................................... 1.3

Main Components of the AT-102................................................................1.4

Back Panel ..................................................................................................1.5

Power Supply ..............................................................................................1.6

Switching On and Off .................................................................................1.6

Changing a Mains Fuse .............................................................................1.7

Potential Equalisation ................................................................................1.7

Keypad.........................................................................................................1.8

LCD Screen .............................................................................................. 1.10

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AT-102 ECG Recorder Service Handbook

ECG Settings .............................................................................1.12

Auto Format 1 and 2 ................................................................................ 1.13

ECG Printout ............................................................................................ 1.13

Average Cycles ........................................................................................ 1.14

Rhythm Leads .......................................................................................... 1.14

Measurements, Markings and Interpretation ........................................ 1.14

Filters ........................................................................................................ 1.15

Baseline filter ............................................................................................ 1.15

Myogram filter .......................................................................................... 1.16

Mains filter ................................................................................................ 1.16

Baseline Stabiliser (SCHILLER SBS) ..................................................... 1.16

Smoothing Filter (SCHILLER SSF)......................................................... 1.16

Interpretation ............................................................................................ 1.17

Leads ........................................................................................................ 1.18

Defining Lead Sequence & Printout ...................................................... 1.18

Stress Settings ........................................................................... 1.20

General Settings ...................................................................................... 1.21

Selecting the ERGO Device .................................................................... 1.21

Blood Pressure Entry .............................................................................. 1.21

Selecting the Default Test Protocol ........................................................ 1.22

Defining the Stage Printout Format ....................................................... 1.22

ST Amplitude Lead................................................................................... 1.22

Defining / Editing Exercise Protocols .................................................... 1.23

Factory programmed Treadmill Protocols............................................. 1.24

Bruce ........................................................................................................ 1.24

Factory programmed Bicycle Protocols ............................................... 1.24

Contents

System Settings ......................................................................... 1.25

Unit ............................................................................................................ 1.26

User Identification (User ID) .................................................................... 1.26

Date and Time .......................................................................................... 1.26

Language ................................................................................................. 1.27

Startup Screen ......................................................................................... 1.27

Paper Mode .............................................................................................. 1.27

Communication........................................................................................ 1.28

Test and Information................................................................................ 1.29

Obtaining a printout of all current settings ............................................ 1.30

Communications Test ............................................................................. 1.32

Upgrade/ Update Software ..................................................................... 1.32

Default Settings........................................................................................ 1.33

Unit Defaults Table................................................................................... 1.34

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AT-102 ECG Recorder Service Handbook

Section 2 Functional Overview........................... 2.1

Introduction .................................................................................. 2.2

MK 18 - 1 Main Board ................................................................... 2.4

Power Supply ..............................................................................................2.4

Program and ECG Memory ........................................................................2.4

Thermal Print Head Controller ...................................................................2.4

Printer Timing ..............................................................................................2.5

Paper Mark ..................................................................................................2.5

Power On Reset ..........................................................................................2.5

Stepper Motor Controller ...........................................................................2.5

ECG Isolated Power Supplies ...................................................................2.5

ECG Signal ..................................................................................................2.6

Noise Damping ...........................................................................................2.6

RS-232 Interface ..........................................................................................2.6

External Modem ..........................................................................................2.6

Top Assembly .............................................................................. 2.7

LCD Screen ................................................................................................. 2.7

Alphanumerical Keyboard .........................................................................2.7

Section 3 Fault Finding ....................................... 3.1

Introduction .................................................................................. 3.2

General Check Procedures........................................................................3.2

Fault Finding Chart ....................................................................... 3.3

AT-102 Initial Fault Diagnosis Chart (Sheet 1) ..........................................3.3

AT-102 Initial Fault Diagnosis Chart (Sheet 2) ..........................................3.4

AT-102 Fault Diagnosis Chart (Sheet A - Power Problems) .....................3.5

AT-102 Fault Diagnosis Chart (Sheet B - Power Problems) ....................3.6

AT-102 Fault Diagnosis Chart (Sheet C - General Problems)..................3.7

AT-102 Fault Diagnosis Chart (Sheet D - Printer Problems).................... 3.8

AT-102 Fault Diagnosis Chart (Sheet F - Exercise Mode Problems) ......3.9

AT-102 Fault Diagnosis Chart (Sheet G - Spirometry Problems) ......... 3.10

AT-102 Fault Diagnosis Chart (Sheet H - Communication

(RS) Problems) ..........................................................................................3.11

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AT-102 ECG Recorder Service Handbook

Functional Check ........................................................................ 3.12

Thermal Printer Check................................................................3.13

Print Head Alignment and Print Head Tension...................................... 3.14

Thermal Printer Fault Diagnosis............................................................. 3.14

RS-232 Interface (and Spiro Check) .......................................... 3.15

Section 4 Module Removal and Replacement .. 4.1

Introduction .................................................................................. 4.3

Safety Notices .............................................................................. 4.4

Physical Overview ........................................................................ 4.5

Exploded View Lower Casing ...................................................... 4.6

Contents

Exploded View Upper Casing ...................................................... 4.7

Prerequisites, Test Equipment, Tools, and Accessories.............. 4.8

General Prerequisites ................................................................................. 4.8

Part Numbers ..............................................................................................4.8

Opening and Closing the Case ....................................................4.9

Top Assembly Removal ..............................................................................4.9

Top Assembly Replacement .................................................................... 4.11

Main Board MK 18 - 1................................................................. 4.12

Parts .......................................................................................................... 4.12

Board Removal ........................................................................................ 4.12

Board Replacement ................................................................................. 4.14

Printer Tray and Thermal printer ................................................. 4.15

Thermal Printer Removal ........................................................................ 4.15

Thermal Printer Replacement. ................................................................ 4.15

Battery Pack ............................................................................... 4.16

Battery Pack Removal ............................................................................. 4.16

Checks and Tests After Battery Replacement ...................................... 4.16

Keyboard....................................................................................4.17

LCD screen board......................................................................4.18

LCD board Removal ................................................................................ 4.18

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AT-102 ECG Recorder Service Handbook

Section 5 Adjustments, System Upgrades and

Software Updates .................................................5.1

Introduction .................................................................................. 5.3

Safety Notices and Conditions ..................................................... 5.4

Conditions ...................................................................................................5.4

Test Equipment ............................................................................ 5.5

Proprietary Test Equipment/Tools ............................................................5.5

Main Board MK 14-10 Adjustment Locations ............................... 5.6

Component Location MK18-1 (Component Side)....................................5.6

Battery Charge Voltage ................................................................ 5.7

Precautions and Requirements.................................................................5.7

Tools and Equipment .................................................................................5.7

Procedure ....................................................................................................5.7

Paper Mark Detector Check ......................................................... 5.8

Tools, Equipment and Material ..................................................................5.8

Procedure ....................................................................................................5.8

ECG Amplifier +2V, -2V and PWM Ramp Time Adjustment ...... 5.10

Tools, Equipment and Material ............................................................... 5.10

Procedure ................................................................................................. 5.10

Service Screen...........................................................................5.12

Upgrading the Unit / Updating the Software................................5.14

Installing New Software Options (Upgrade) .......................................... 5.14

Updating the System Software ............................................................... 5.16

Section 6 Spare Parts .......................................... 6.1

Ordering Information .................................................................... 6.2

Spare Parts .................................................................................. 6.3

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AT-102 ECG Recorder Service Handbook

Section 7 Technical Data ..................................... 7.1

Technical Data .............................................................................. 7.3

System:........................................................................................................7.3

Safety Standards: .......................................................................................7.4

Technical Data for ECG: .............................................................................7.4

Technical Data for Spirometry (Option): ...................................................7.5

Standard ......................................................................................................7.7

Configurations ............................................................................................7.7

Annex A Glossary................................................ A.1

Introduction ................................................................................. A.2

Acronyms .................................................................................... A.3

Contents

Annex B AT-102 Circuit Diagrams and

Engineering Drawings ........................................ B.1

Index

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SCHILLER

The CardioLaptop AT-102 is warranted against defects in material and manufacture for the

duration of one year (as from date of purchase). Excluded from this guarantee is damage

caused by an accident or as a result of improper handling. The warranty entitles free

replacement of the defective part. Any liability for subsequent damage is excluded. The

warranty is void if unauthorized or unqualified persons attempt to make repairs.

In case of a defect, send the apparatus to your dealer or directly to the manufacturer. The

manufacturer can only be held responsible for the safety, reliability, and performance of the

apparatus if:

 assembly operations, extensions, readjustments, modifications, or repairs are

carried out by persons authorized by him, and

AT-102 ECG Recorder Service Handbook

Terms of Warranty

 the SCHILLER AT-102 and approved attached equipment is used in accordance with

the manufacturers instructions.

THERE ARE NO EXPRESS OR IMPLIED WARRANTIES WHICH EXTEND BEYOND THE

WARRANTIES HEREINABOVE SET FORTH. SCHILLER MAKES NO WARRANTY OF

MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE WITH RESPECT TO

THE PRODUCT OR PARTS THEREOF.

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

device, pursuant to both Part 15 of the FCC (Federal Communications Commission) Rules

and the radio interference regulations of the Canadian Department of Communications.

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 this instruction manual, may cause harmful interference to radio communications.

Operation of this equipment in a residential area is likely to cause harmful interference in

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

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AT-102 ECG Recorder Service Handbook

Disposal Instructions and Battery Care

Do not dispose of battery, boards, or components by fire or incinerator - Danger of
Explosion

Do not open the battery casing - Danger of acid burn

Contents

Only dispose of the battery, boards, or components in official recycling centres or

municipally approved areas. Alternatively, used batteries and components can be

returned to SCHILLER AG for disposal.

Units no longer required can be returned to SCHILLER AG for disposal. Alternatively

dispose of the unit in municipally approved recycling centres.

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SCHILLER

Before using the unit, ensure that an introduction regarding the unit functions and the



safety precautions has been provided by a product representative.

 The guidelines for patient electrode placement are provided as an overview only. They are

not a substitute for medical expertise.

 IEC 601-1-1 states that the patient must remain at least 1.5 metres clear of the AT-102.

When this is not possible an isolation transformer must be installed.

 It must be ensured that neither the patient nor the electrodes (including the neutral

electrode) come into contact with other persons or conducting objects (even if these are
earthed).

AT-102 ECG Recorder Service Handbook

Safety Notices

Operational Precautions

 This unit is CF classified and defibrillation protected when the original



 Do not touch the unit casing during defibrillation.

 If the patient cable should become defective after defibrillation, lead-off is displayed and

an acoustic alarm given.

 Do not operate the unit if the earth connection is suspect or if the mains lead is dam-

aged or suspected of being damaged.

 This product is not designed for sterile use.

 This product is not designed for outdoor use.

 Do not use this unit in areas where there is any danger of explosion or in the presence

of flammable gases such as anaesthetic agents.

 Do not operate the unit if the earth connection is suspect or if the mains lead is dam-

aged or suspected of being damaged.

 There is no danger when using the ECG unit for a patient with a pacemaker fitted.

 The LCD screen assembly is heavy and can cause injury if closed unintentionally.

Ensure fingers are kept clear.

 Surface temperature of applied parts must not exceed 41

 If the display is damaged, a leakage of fluid may occur. do not inhale the vapour from

this fluid and avoid contact with mouth and skin. if contact is made, clean contaminated
area immediately with fresh water.

patient cable is used. However, as a safety precaution when possible,
remove electrodes before defibrillation.

o

.

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AT-102 ECG Recorder Service Handbook

Precautions for Operation with other Devices

Use only accessories and other parts recommended or supplied by SCHILLER AG. Use



of other than recommended or supplied parts may result in injury, inaccurate information
and/or damage to the unit.

 Externally connected units must use the same common earth.

 Externally connected units must use an original SCHILLER interface cable.

 If several units are coupled, there is a danger of summation of leakage currents. When

two or more units are coupled together, an isolation transformer must be used in the
mains supply.

 The AT-102 complies with EMC regulations for medical products which affords protection

against emissions and electrical interference. However, special care must be exercised
when the unit is used with high frequency equipment.

 There is no danger when using the ECG unit simultaneously with electrical stimulation

equipment. However, the stimulation units should only be used at a sufficient distance
from the electrodes. In case of doubt, the patient should be disconnected from the
recorder.

Contents

Safety Notices

 To avoid possible interference from the Ergometer when carrying out an exercise test, it

is recommended that both the AT-102 and the Ergometer are connected to the same
common ground.

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SCHILLER



BEFORE CARRYING OUTANY MAINTENANCE PROCEDURES, SWITCH THE UNIT
OFF AND DISCONNECT FROM THE MAINS BY REMOVING THE MAINS PLUG.

 The unit is protected by double pole / neutral fusing for continued protection against the

risk of fire. Replace only with the same fuse type and rating.

 Do not use high temperature sterilisation processes (such as autoclaving). Do not use e-

beam or gamma radiation sterilisation.

 Do not use solvent or abrasive cleaners on either the unit or cable assemblies.

 Do not, under any circumstances, immerse the unit or cable assemblies in liquid.

AT-102 ECG Recorder Service Handbook

Safety Notices

Maintenance Precautions

xiv

AT-102 ECG Recorder Service Handbook

Symbols and Conventions Used in this

Service handbook

The following words and symbols mark special messages throughout this guide.

General Warning. Text set off in this manner indicates that failure to follow directions could
result in bodily harm or loss of life or failure to follow directions could result in damage to
equipment or loss of information.

WARNING:

Specific Warning. Text set off in this manner indicates that failure to follow
directions could result in bodily harm or loss of life.

Contents

CAUTION:

Text set off in this manner indicates that failure to follow directions could result
in damage to equipment or loss of information.

NOTE:

Text set off in this manner presents clarifying information, specific instructions,
commentary, sidelights, or interesting points of information.

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SCHILLER

AT-102 ECG Recorder Service Handbook

What's in this book

The service philosophy for the AT-102 is fault finding to module level. The purpose of this book is to

provide all the information necessary to enable the service engineer to efficiently locate and

replace a faulty module. This book assumes no detailed knowledge of the AT-102 but does require

that the service engineer is familiar with standard workshop practices, and to have attended an AT-

102 service course. The book is divided into the following chapters:

Chapter 1 - Operating Elements

The purpose of this chapter is to provide an easy reference for all the main operator functions and

to give a basic introduction to the AT-102 . This chapter gives details of the operator controls with

the operation and function of each key briefly explained. The information in this chapter provides a

background to the operating functions only. Complete operating information is provided in the

SCHILLER AT-102 User Guide.

Chapter 2 - Functional Overview

This chapter provides a functional overview of the AT-102 . The description is supported by

functional block diagrams.

Chapter 3 - Fault Diagnosis

This chapter provides a guide to locate a fault to module level. The diagnostics are presented in a

logical sequence of fault finding algorithms and procedures. Illustrations are provided to support

the text where needed.

Chapter 4 - Module Removal and Replacement

This chapter gives an overview of the physical construction of the AT-102 with the main physical

attributes of the unit briefly described. The physical description is supported by illustrations

showing the internal location of all modules. Removal and replacement instructions for all

removable modules are also provided in this chapter. Each procedure is autonomous with details

of tools, jumper settings, adjustments and settings or special requirements that are required

before and after replacement. Functional checks that must be carried out after replacing a module

are also provided.

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AT-102 ECG Recorder Service Handbook

This chapter provides all adjustments and settings. Also detailed in this chapter are basic

functional test procedures that can be performed to check the functioning of the unit.

This chapter provides the part numbers and reordering information for all replaceable modules.

Also included in this chapter are details of any special test equipment or special tools required for

adjustment or fault finding procedures.

The full technical specification of the AT-102 is given in this chapter.

Contents

Chapter 5 - Adjustments

Chapter 6 - Spare Parts

Chapter 7 - Technical Data

Annex A - Glossary

This chapter explains all the acronyms and signal titles used in this book and in the AT-102 circuit

diagrams.

Annex B - Circuit Diagrams & Board layouts

The circuit diagrams and component layouts are provided for all boards. These details are provided

for information only.

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AT-102 ECG Recorder Service Handbook

xviii

AT-102 ECG Service Handbook

Operating Elements

Section 1

Operating Elements

Section 1

This section contains an introduction to the AT-102 and an

overview of all external connections. It also gives an overview of

the operating philosophy of the AT-102 and an introduction to the

basic functions of the unit. An overview of the system settings are

given in this section - for full operating details and system setup

see the AT-102 User Guide.

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1.1

AT-102 Service Handbook

Introduction

The SCHILLER AT-102 is a 12-channel ECG unit designed to record, display, and analyse

resting ECGs (exercise ECGs can also be recorded). The unit has been extensively

researched to give an ergonomic, clear interface that`s easy to use without compromising

functionality. The AT-102 has the following features:

Features

 Alphanumeric keypad and dedicated soft key interface for easy, user friendly

operation.

 Storage and transmission facilities for recordings.

 Excercise ECG with interface for control of digital ergometers and treadmills. (Option)

 Integral full size thermal quality printer with various user defined print format options.

External laser or deskjet printer (Option).

 ECG Interpretation including measurements and average cycles with automatic and

manual printout of the recording. (Option)

 Spirometry (Option)

1.2

AT-102 ECG Service Handbook

Introduction

Operating Philosophy Overview

There are broadly four types of data display as follows

Data Acquisition and In this screen the real-time ECG is displayed. From this

ECG Recording Screen screen a continuous printout can be initiated and/or an

auto recording can be made. In auto mode 10 seconds of

ECG data is analysed and averaged and the results given

on a printout. The format and data of an auto mode printout

is independent of the screen display.

An auto mode recording can also be stored in the memory

for later print or transmission.

Memory Screen In this screen stored recordings can be accessed.

Section 1

Operating Elements

Patient Data Screen Patient data entry via the keypad.

Data Entry and Setup In these screens all system settings, resting and exercise

ECG settings, and spiro settings are made.

Initiating Functions or Tasks

Most functions and tasks are initiated by the 5

softkeys situated immediately below the LCD.

The function of the softkeys varies according to

the screen displayed and is displayed on the

LCD immediately above the key itself.

During data acquisition, further dedicated

function keys are provided to make an auto

mode recording (START) and to stop a manual

printout (STOP). The top line of the

alphanumeric keypad, additionally enables

direct settings of lead group, trace speed and

sensitivity, filter on/off and other functions, for

both the real-time display and (manual)

printout.

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1.3

Introduction

Main Components of the AT-102

AT-102 Service Handbook

1.4

4

1

1. Keypad and dedicated function keys

2. Patient cable connector

3. RS-232 for any of the following:

° connection of an ergo device

° connection of a spiro sensor

° connection of a modem or a PC for export of stored recordings

4. Softkey control

5. LCD Display.

2

3

5

AT-102 ECG Service Handbook

Introduction

Back Panel

Section 1

Operating Elements

1 2

1. LPT connector for the connection of an external printer

2. Master Reset

3. Potential equalisation stud

4. Mains connector (with fuse below)

CAUTION:

All externally connected hardware must be approved by SCHILLER.
Connection of any hardware not approved by SCHILLER is at the owner`s
risk. The unit guarantee may also be invalid.

3 4

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1.5

AT-102 Service Handbook

Introduction

Power Supply

The mains connection is on the rear of the unit.

The power supply voltage is set by the factory for 100-115V (nom. 110V) or 220-240V

(nom. 230V) working. The setting is indicated by the indented metal strip on the

fuse panel. Contact your dealer if the voltage needs to be changed.

Switching On and Off

The AT-102 is switched on with the

green ON key and off with the red OFF

key. These keys are situated on the

top right of the keypad.

The mains indicator lamp on the

keypad is always lit when the unit is

connected to the mains supply.

The unit can either be operated from

the mains supply or from the built-in

rechargeable battery. The power

source is indicated on the top line of

the LCD. When mains is connected a mains symbol is displayed. When the unit is running

on battery power a battery symbol is displayed

Power Indicator symbol

The internal battery provides power for up to 3

hours. The Battery indicator blinks when the

battery capacity is limited.

To recharge the battery, connect the

apparatus to the mains supply by means of

the supplied power cable. A totally discharged

battery requires less than 15 hours to be fully

recharged (60% in less than 3 hours, 90% in

less than 7 hours). The unit can remain

connected to the mains supply without

damage to either the battery or the unit.

1.6

NOTE

When working from battery power, the unit is automatically switched off after
5 minutes (30 seconds if battery capacity is limited) if no key is pressed.

AT-102 ECG Service Handbook

Introduction

Changing a Mains Fuse

CAUTION

If it is necessary to change a fuse, always replace with the correct rating
i.e. 2x200mAT for 230V, or 2x315mAT for 110V .

To change a fuse press the retaining lug in the middle of the fuse panel (situated below the

mains connector on the back panel). Remove the fuse panel and replace the fuse(s). Click

the fuse panel back in position.

Potential Equalisation

Section 1

Operating Elements

The potential equalisation stud at the rear of the unit can be used to equalise the ground

potential of the AT-102 to that of all mains powered equipment in the vicinity. Use the

hospital or building common ground.

CAUTION:

To avoid possible interference from the Ergometer when carrying out an
exercise test, it is recommended that both the AT-102 and the Ergometer
are connected to the same common ground.

To prevent the possibility of leakage current when an external printer is
connected, always ensure that the mains lead, or the potential equalisation
(next to the mains connector), is attached to the AT-102

A yellow/green ground cable is supplied as an option (Article number 2. 310 005).

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1.7

Introduction

Keypad

1

AT-102 Service Handbook

2

4 7 8

5

6

10 11 12 13

9

3

14

15

1.8

17

16

AT-102 ECG Service Handbook

Introduction

1. Softkeys - the function of these keys changes depending on the screen displayed.

The function of these keys is shown on the screen above the keys. If nothing is

written above a softkey, it has no function for the current screen.

2. Auto Mode recording (in Auto mode 1).

Press the Function key (17) followed by the AUTO key (2) for auto mode 2.

3. STOP printout / confirm (new) setting

4. Open / Close paper tray (to replace thermal printing paper)

5. The top figures on the number keys `1` and `2 ` (designated < and >), change the

lead group displayed on the screen, forward and backward resp.

6. Auto sensitivity key - automatically sets the ECG printout sensitivity ( in AUTO mode

only) to the best setting for the signal strength (5mm/mV or 10mm/mV)

7. The top figures on the number keys designated 5, 10, and 20 set the sensitivity of

the ECG both on the screen and on the (manual) printout. The sensitivity is 5, 10 or

20 mm / mV.

8. The top figures on the number keys designated 5/10, 25, and 50 set the speed of the

ECG both on the screen and on the (manual) printout. The speed on the screen can

only be set to 25 or 50 mm/s. The speed of the manual printout can be 5, 10, 25 or

50 mm/s. The 5 and 10 mm/s settings are both on the same key which toggles the

two speeds.

9. Inserts a 1mV reference marker on the screen and printout. Recentres the trace.

10. Toggles the QRS beeper ON/ OFF

11. Myogram filter ON / OFF. The cutoff frequency can be user defined in `Setup`.

12. Delete last typed character.

13. Patient data key. Press this key to enter a new patient or modify the data for the

current one.

Section 1

Operating Elements

NOTE:

The patient data screen, or the ECG screen is the first screen displayed on
inital switch on. This is set for user preference in the system settings (See
following).

14. ON / OFF Keys

15. Mains Indicator - lit when mains connected.

16. Press the function key (17) and the UP/DOWN arrows to adjust screen contrast.

When entering patient data use the LEFT/RIGHT arrow keys to move the cursor in

the data field. Use the UP/DOWN arrow keys to go up/down to the next data entry

17. Function Key (Fn). When pressed before another key, initiates the second function of

that key.

For example, second letters on the keypad (è, é, ç, ø @ etc.), are entered by holding

the function key before pressing the letter key.

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1.9

AT-102 Service Handbook

Introduction

LCD Screen

The display will vary according to the current task being carried out. In all screens however,

the top and bottom lines always display the same information: the top line displays system

information (time, patient, power source etc.,), and the bottom line always gives the softkey

options.

The following is an example of a typical resting ECG screen.

3

1

2

Items 1, 2 and 3 are in the same position for all screens.

1. Top line - time, date, patient name, and current power source - mains (

battery ( ). When battery capacity is limited the battery symbol flashes.

2. Softkey designation. Pressing the key below the text carries out the function

indicated. The options available will change according to the screen

displayed.

3. Data acquisition area or data entry area.

4

5
6

7
8

9

10

), or

1.10

AT-102 ECG Service Handbook

Introduction

Items 4 to 10 are specific for ECG acquisition only:

4. Current Heart Rate (averaged over 4 beats and refreshed every 2 seconds). The HR is

also given on a manual printout. Note that with an auto mode printout the HR is

averaged over the full 10 seconds of the recording.

5. Electrode connections - when a lead flashes it indicates that the electrode resistance

is too high. The electrode(s) must be reapplied.

6. Sensitivity - 5, 10 or 20 mm/mV. Change the sensitivity with the keys 3 (auto), 4, 5

and 6. An `A` in this box indicates that automatic sensitivity is selected (auto mode

printout only).

7. Speed - 25 or 50 mm/s. Change the speed with the keys 8 and 9.

8. Lead indication (leads currently displayed on the screen). Change the lead group with

the < and > keys on the keypad.

9. Myogram Filter indication - 'Filter ON' or 'Filter OFF'. The filter is applied with the filter

key.

Note: the frequency of the filter cutoff is defined in Section 4 Setup.

10. Area for system messages or instructions.

Section 1

Operating Elements

Article Number 2. 540 028

SCHILLER AG 2002

1.11

AT-102 Service Handbook

ECG Settings

The AT-102 ECG and system settings are entered by selecting 'setup' from the initial

screen:

1.12

The following pages detail the programmable ECG parameters.

NOTE:

In units where the interpretation option is not installed, interpretation state­ments, cannot be displayed.

AT-102 ECG Service Handbook

ECG Settings

Section 1

Operating Elements

 Use the select softkey to select the different settings

 Use the Up/Down softkeys to highlight the various options.

Auto Format 1 and 2

Two separate Auto formats can be defined for the AT-102. Use the NEXT softkey to confirm

setting and to move onto the next screen (Format 2).

ECG Printout

Press the `SELECT` softkey to choose from the following options:

No Printout No printout of the ECG given at the end of an auto mode recording (the

recording can be stored in the memory and printed at a later time if

required).

4*3 + 1 Rhythm Leads are printed in a 4 * 3 format at 25mm/s, with the selected rhythm

lead at the bottom of the page at 25mm/s.

1*12 at 25mm/s Leads are printed in a 1 * 12 format at 25mm/s - no rhythm lead printed.

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1.13

AT-102 Service Handbook

ECG Settings

8*5s + 4*10s The first 8 leads printed for 5 seconds and the last 4 leads printed for

10 seconds.

Short at 25mm/s Leads are printed in short form (1 sheet) at 25mm/s.

Long at 25mm/s Leads are printed in long form (2 sheets) at 25mm/s.

Long at 50mm/s Leads are printed in long form (2 sheets) at 50mm/s.

Average Cycles

No Printout No printout of average cycles

4*3, 25mm/s + 2 Rhythm Leads are averaged over the entire 10 second recording and printed

in 4 groups of 3 leads at 25mm/s, with the two selected rhythm

leads at the bottom of the page at 25mm/s.

4*3, 50mm/s + 2 Rhythm Leads are averaged over the entire 10 second recording and printed

in 4 groups of 3 at 50mm/s, with the two selected rhythm leads at

the bottom of the page at 25mm/s.

2*6, 50mm/s + 2 Rhythm Leads are averaged over the entire 10 second recording and printed

in two groups of six at 50mm/s, with the two selected rhythm leads

at the bottom of the page at 25mm/s.

Rhythm Leads

Select the rhythm lead 1 and rhythm lead 2 as described above.

Rhythm Lead 1 Select any lead (I, II, III, aVR, aVl, aVF, V1 to V6)

Rhythm Lead 2 Select any lead (I, II, III, aVR, aVl, aVF, V1 to V6)

Measurements, Markings and Interpretation

Measurements Select yes or no to print a detailed table of measurement results

Markings Select yes or no to print reference markings on the ECG average

cycle print. A vertical marker shows the beginning and end of P wave

and QRS, and the end of the T wave

Interpretation Select yes or no to print interpretation statement

Full details of the interpretation option are given in the SCHILLER ECG Measurement and

Interpretation booklet (art. No. 2.510 179).

1.14

AT-102 ECG Service Handbook

ECG Settings

Filters

Section 1

Operating Elements

There are five different filters which can be set individually as follows:

Baseline filter

The cutoff frequency of the filter is set on the top line. The cutoff can be 0.05Hz, 0.15Hz or

0.3Hz.

Note:

The set value is the lower limit of the frequency range and is normally set to

0.05 Hz. The settings 0.15 and 0.30 Hz should only be used when absolutely
necessary, as the possibility exists that they could affect the original ECG
signal, especially the ST segments.

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1.15

AT-102 Service Handbook

ECG Settings

Myogram filter

The Myogram filter suppresses disturbances caused by strong muscle tremor. The filter is

applied by pressing the FILTER key (or programmed on as default when the unit is

switched on).

When the Myogram filter is on, `FILTER ON` is displayed in the

information box.

The cutoff frequency is user defined at 25Hz or 35Hz. When `off at

power up` is selected, the Myogram filter is off when the unit is first

switched on.

Note: An ECG recorded in auto mode is stored unfiltered. It is therefore possible to print

the stored ECG either with or without passing the myogram filter. Filter ON is

indicated on the LCD.

Mains filter

The mains filter is an adaptive digital interference filter designed to suppress ac interference

without attenuating or distorting the ECG.

Set the mains filter in accordance with the frequency of your local mains supply.

Baseline Stabiliser (SCHILLER SBS)

The baseline stabiliser greatly reduces the baseline fluctuations without affecting the ECG

signal. The purpose of the stabiliser is to keep the ECG signals on the baseline of the

printout. This filter is only effective in auto mode printout.The Baseline Stabiliser is applied

to a recording (on), or not applied to a recording (off).

Smoothing Filter (SCHILLER SSF)

The smoothing filter (SSF: SCHILLER smoothing filter) is a low pass filter to suppress high

frequency artefacts between the QRS complexes. When this filter is switched on, `SSF` is

shown on the bottom line of the automatic printout.

1.16

AT-102 ECG Service Handbook

ECG Settings

Interpretation

The interpretation settings enable the user to determine whether or not certain comments

will be added to the interpretation statements on the ECG printout. Furthermore, the

patient’s age can be assumed (<

sensitivity. Low sensitivity will suppress certain non-specific ECG diagnoses; this may be

advisable when carrying out ECGs for screening.

Section 1

Operating Elements

30 or >30). Low or high can also be set for interpretation

Sensitivity High or low sensitivity

Age Assumed to be Greater than 30 years, or 30 years and under.

NOTE:

The `Patient age assumed to be..` setting is only applicable when
patient data has not been entered. When a patient`s date of birth has
been entered, this setting is ignored.

Abnormal ECG `Normal` / `Abnormal` is printed or not printed

Unconfirmed Report `Unconfirmed Report` is printed or not printed

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1.17

ECG Settings

Leads

AT-102 Service Handbook

Defining Lead Sequence & Printout

The required settings can be selected as follows:

Lead Sequence Select between:

Standard lead sequence or

Cabrera lead sequence

Signals Select between:

Simultaneous - all ECG leads are printed in the same time segment

(in automatic mode only), or

Sequential - each group is a contiguous time segment of

approximately 2.5 or 5 seconds (in automatic mode only).

Auto-Centering Select between:

On - all ECG traces are centred dynamically for optimal use of paper

width, or

Off - ECG traces are set to a fixed baseline position and may

possibly overlap.

1.18

AT-102 ECG Service Handbook

ECG Settings

The lead group settings allow extra leads to be displayed on the screen when set to `on`.

The following lead groups can be displayed:

Rhythm Lead Group II, avF, III / V2, V4, V5

Left Posterior (V4-V9) V4, V5, V6 / V7, V8, V9

Right Precordials (V5r) V1, V2, V3 / V3r, V4r, V5r

Right Precordials (V6r) V1, V2, V3r / V4r, V5r, V6r

Nehb (D, A, J) D, A, J (only three leads)

The above leads can also be printed when displayed (only in manual mode)

The lead groups are changed both on the screen and on the manual printout with the lead

next/previous keys:

Section 1

Operating Elements

Article Number 2. 540 028

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1.19

AT-102 Service Handbook

Stress Settings

The AT-102 Stress ECG settings are entered by selecting 'Setup' and 'Stress Settings' from

the initial screen:

1.20

The following pages detail the stress settings for the AT-102.

AT-102 ECG Service Handbook

Stress Settings

General Settings

Section 1

Operating Elements

Selecting the ERGO Device

Ergo devices available for use with the AT-102 are as follows:

Bikes:

 The Ergoline digitally controlled exercise bicycle 900 / 911
 SECA CT100 mod.545

Treadmills:

 The Ergoline digitally controlled treadmill TM435/TM4000ES
 RAM 770CE
 MTM-1500

Blood Pressure Entry

Select between Off, Auto and Manual. When Manual is selected the BP screen (for entry of

blood pressure), is displayed 55 seconds before the end the stage. When the stages are

less than one minute long, or a stage is held, then the BP screen is displayed every 2

minutes.

The AUTO function is not available at the time of print.

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1.21

AT-102 Service Handbook

Stress Settings

Selecting the Default Test Protocol

Two protocols for a bike and two for a treadmill are available for selection when starting a

stress test - the two protocols displayed when starting a stress test are defined here.

The user defined protocols (one for a treadmill and one for a bike) are defined by the user

(see following page).

Defining the Stage Printout Format

A stage printout is given at the end of every stage. When the stages are less than 2

minutes long, or a stage is held, then a prinout is given every 2 minutes.

The waveforms are averaged to give 4 x 3 plus 1 rhythm lead, or 6 x 2. The rhythm lead

printed is the ST lead defined below.

ST Amplitude Lead

Define the lead that is used for ST measurement. This lead is also printed as the rhythm

lead if set in the stage printout.

1.22

AT-102 ECG Service Handbook

Stress Settings

Defining / Editing Exercise Protocols

Section 1

Operating Elements

For a bicycle the following can be defined:

 Protocol Name - The name defined here appears in the general stress settings (when

selecting the two default bike protocol (see previous page)

 Base Load - The load in Watts, applied during the warm-up period

 Step load - The load increase at every step

 Recovery Load - The load applied during the recovery phase

 Step Interval - The duration of each step

For a treadmill Protocol, the following can be set:

 Protocol Name - As above

 Step Interval - The duration of each step

 Speed - The individual treadmill speed of each step

 Elevation - The individual treadmill elevation of each step

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1.23

Stress Settings

Factory programmed Treadmill Protocols

One factory programmed Treadmill protocols is availbale as follows:

Bruce

Stage Duration Speed Elevation

1 3 min 2.7km/h (1.7mph) 10%

2 3 min 4.0km/h (2.5mph) 12%

3 3 min 5.4km/h (3.4mph) 14%

4 3 min 6.7km/h (4.2mph) 16%

5 3 min 8.0km/h (5.0mph) 18%

6 3 min 8.8km/h (5.5mph) 20%

7 3 min 9.6km/h (6.0mph) 22%

AT-102 Service Handbook

Factory programmed Bicycle Protocols

One factory programmed Bicycle protocols is available 252525. This gives a base load

(warmup) of 25W (50W), with a step load for both protocols of 25W and a recovery load of

25W.

1.24

AT-102 ECG Service Handbook

System Settings

The AT-102 system settings are entered by selecting 'setup' and 'system settings' from the

initial screen:

Section 1

Operating Elements

The following pages detail system settings for the AT-102.

Article Number 2. 540 028

SCHILLER AG 2002

1.25

System Settings

Unit

AT-102 Service Handbook

User Identification (User ID)

The user identification is printed on all recordings. The user ID can be the department,

doctor or hospital etc. Select User ID and a blinking cursor is present - enter up to 30

characters via the keypad.

Note: If the unit is reset to the default settings (see following), the user identification must

be re-entered.

Date and Time

Enter the date in the format day.month.year. Enter the time using

the standard 24 hr notation. When set, the ENTER key must be

pressed to confirm.

1.26

AT-102 ECG Service Handbook

System Settings

Language

Several languages are already programmed into the unit. Select the language for the screen

display and for the printout. The language will also set the units used by the system.

The difference between American and English is as follows:

American Standard English

measurements in inches measurements in centimetres

temperature in Fahrenheit temperature in degrees centigrade.

Mains filter setting - 60Hz mains filter setting - 50Hz

date order mm-dd-yy date order dd-mm-yy

Section 1

Operating Elements

Additionally, when American is set, further race settings are given and Spiro diagnosis is

based on ITS recommendations - see Spirometry handbook.

The default language is (Standard (International)) English.

Startup Screen

Here you can specify the first screen to be displayed when the unit is switched on. Select

between patient data screen (for entry of new patient) or data acquisition screen (ECG).

Paper Mode

The internal printer can print on A4 or letter size paper. Set according to the paper used.

Article Number 2. 540 028

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1.27

System Settings

Communication

AT-102 Service Handbook

Baudrate Select a Baud rate between 115200 and 9600 Baud, according to the

modem/computer used. Most computers can connect at 115200 Baud

and the standard modem speed is 57600 Baud. If problems are

experienced during transmission reduce the Baud rate.

Mode Select between line (computer connected directly to the RS-232

interface), or modem (for transmission over the phone network)

Phone No. Enter the telephone number preceded by `T` or `P` (tone or pulse).

A comma `,` gives a one second pause in dialling - this may be

necessary for example, if an outside line is required.

Modem Init. Enter the modem initialisation codes. Full details will be found in the

user guide for your modem. However, the modem initialisation must

contain at the minimum, the following commands with the prefix `AT`.

`Q0`- modem sends response

`V0`- numerical response codes

`E0`- no command echo

The standard modem initialisation code is: ATB0L1V0Q0E0S0=0

If in doubt about any of these settings, please contact your phone company and/or modem

supplier.

1.28

AT-102 ECG Service Handbook

System Settings

Test and Information

Section 1

Operating Elements

A code of the options installed is given after the software version. These are as follows:

 C = Interpretation

 S = Stress

 M = Memory (Standard)

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1.29

AT-102 Service Handbook

System Settings

Obtaining a printout of all current settings

To obtain a printout press the `PRINT SETUP` softkey

A printout of the defined settings will be produced and gives the following information,

depending on the installed software:

Unit designation Software version, Software options installed (C = Interpretation, M

= Memory (standard), S = Stress) and Serial number of the unit

ECG Format (1 and 2) Speed Default speed setting

Auto printout Long (ooo), Short (o) or Suppressed (-)

MECG Average cycles as defined in auto ECG

recording setup (e.g. 4 * 3 (25 mm/s) + 2)

Rhythm leads Leads selected for R1, R2 resp.

Measurements Print - Enabled (+) or Suppressed (-)

Marks Print - Enabled (+) or Suppressed (-)

Interpretation Print - Enabled (+) or Suppressed (-)

Leads Sequence Standard (S) or Cabrera (C)

Signals Printout of signals - Sequential or

Simultaneous

Auto Centering Enabled (+) or Suppressed (-)

Lead Group Rhythm, V9, V4r, V6r, DAJ, ON (+) or OFF (-)

for each lead group

1.30

AT-102 ECG Service Handbook

System Settings

Filter Baseline Filter 0.05, 0.15 or 0.30 Hz

Mains Filter 50, 60 Hz or OFF (-)

Myogram Filter 25 or 35 Hz, ON (+) or OFF (-)

SSB Filter Smoothing Filter Enabled (+) or Suppressed

(-)

SSF Filter Baseline Stabiliser Enabled (+) or

Suppressed (-)

Interpretation Sensitivity Low (-) or high (+) sensitivity

A30 Patient age is assumed to be <

or >30 (+)

U ‘Unconfirmed report’ is written (+) or

suppressed (-)

Abnormal Normal / Abnormal printed Enabled (+) or

Suppressed (-)

Section 1

Operating Elements

30 (-)

Comm Baud rate 115200, 57600, 38400, 28800, 14400 or 9600.

This is followed by parity setting (Y/N), bits

and number of stop bits.

Mode Line or Modem

Spiro F=f(v) Enabled (+) or Suppressed (-)

Flow =f(V) Enabled (+) or Suppressed (-)

Diagn. Enabled (+) or Suppressed (-)

PEFD (l/min) Enabled (+) or Suppressed (-)

Axis 5, 10 or 20 mm/s

Stress Bike 900 / 911 or SECA CT100 or none

Prot 252525 or user

TM ETM435/TM4000ES or RAM 770CE or MTM-

1500 or none

Prot Bruce or user

BP Manual, automatic of none

Stage Print leads and format

ST Lead Defined lead for ST Measurement

J- Point J plus 20ms, 40ms, 60ms, or 80ms

Date and Time System date and time, and user ID (if set)

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1.31

AT-102 Service Handbook

System Settings

Communications Test

When this is selected, test options are given for the RS-232 communication port. Use this

test if the RS-232 port is suspected of malfunction. A special test plug is used to carry out

the UART test. Full details if checking the RS-232 port is given in the AT-102 Service

Handbook.

Upgrade/ Update Software

Use the upgrade option to install any available software options (e.g. Exercise). An upgrade

code can be obtained from SCHILLER.

Use the Update option to update the current software.

NOTE:

Details of these procedures are given in Section 5 of this handbook.

1.32

AT-102 ECG Service Handbook

System Settings

Default Settings

Section 1

Operating Elements

To reset the unit to the base default settings, press the `BASE INIT` softkey. As the unit

resets to the default values a message is briefly displayed on the LCD. The base settings

(Defaults) are given on the following page.

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1.33

AT-102 Service Handbook

System Settings

Unit Defaults Table

Settings Standard With Interpretation

Language As set As set

Auto Format 1 ECG: 25mm/s, short (o) ECG : 25mm/s, short (o)

Rhythm Leads V1 Rhythm Leads V1, II

MECG: 2*6 (50mm/s + 1)

Measurements: Suppressed (-)

Interpretation: Enabled (+)

Marks: Enabled (+)

Auto Format 2 ECG: 25mm/s, Long (ooo) ECG : 25mm/s, long (ooo)

Rhythm Leads V1 Rhythm Leads V1, II

MECG: none

Measurements: Suppressed (-)

Interpretation: Suppressed (-)

Marks: Enabled (+)

Leads Sequence Standard (S) Sequence Standard (S)

Rhythm On (+) Rhythm On (+)

V9 On (+) V9 On (+)

V4r Off (-) V4r Off (-)

V5r Off (-) V5r Off (-)

DAJ Off (-) DAJ Off (-)

Autom. Centering Enabled (+) Autom. Centering Enabled (+)

Signals Sequential Signals Sequential

Filter Baseline 0.05Hz Baseline 0.05Hz

Mains Filter 50Hz (60Hz) Mains Filter 50Hz (60H

Myogram 35Hz, OFF Myogram 35Hz, OFF

Memory and Communication Baud rate 57600 bps Baud rate 57600 bps

Trans. mode: line Trans. mode: line

Interpretation Settings Suppressed (-)

U: Enabled (+)

A30: Age assummed to be < 30

1.34

AT-102 ECG Service Handbook

System Settings

Settings Standard With Interpretation

Spiro FVC=f(t) on(+) FVC=f(t) on(1)

F=f(v) on(+) F=f(v) on(+)

Diagn.on(+) Diagn.on(+)

PEF (l/min)on(+) PEF (l/min)on(+)

Axis 10 mm/s Axis 10 mm/s

Stress Bike 900 / 911 Bike 900 / 911

Prot 252525 Prot 252525

TM ETM435/TM4000ES TM ETM435/TM4000ES

Prot Bruce Prot Bruce

BP off BP off

Stage Print 4*3 + 1 Rhythm Stage Print 4*3 + 1 Rhythm

ST Lead V5 ST Lead V5

J- Point J + 60msec J- Point J + 60msec

Section 1

Operating Elements

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1.35

AT-102 Service Handbook

1.36

AT-102 Service Handbook

Functional Overview

Section 2

Functional Overview

Section 2

.

Article Number 2. 540 028

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2.1

AT-102 Service Handbook

Introduction

This chapter provides a functional overview of the AT-102 electronics. The aim of this

overview is to enable the service engineer to identify processing paths in order to help

identify possible faulty modules. A functional block diagram supports the text.

Most of the electronics are mounted on a single main board which is housed in the base of

the two part AT-102 casing.

The main functional areas of the AT-102 are as follows:

On the Main Board:

 CPU (68332)

 Opto isolated and shielded ECG multiplexer with isolated power supply and patient

interface

 Power Supply

 Flash EPROM (electrically erasable) 16 Megabytes

In the top assembly

 Keyboard

 TFT screen

In the base assembly:

 Thermal Printer

 Paper tray drive motor

 Battery

2.2

AT-102 Service Handbook

RS-

232

P14

Ext

Printer

P15

Section 2

Functional Overview

LCD screen

Keyboard

TOP ASSEMBLY

P17

P8

ler

interface

Voltage

regulator

+US

Keyboard

+5.2V

regulator

LCD control-

MAIN BOARD MK 18 - 1

LCD power

supply

+5V ref

Voltage

P10

+24V

Switching

voltage reg.

RS-232

Interface

Voltage sense

Ext. Printer

BLOW

& conversion

Interface

10.3V MON

Direct

Function

PRINTER

THERMAL

Keys

detector

Paper mark

P12

CPU

Thermal print

controller

Print head

head

P11

Printer motor

P7

motor

Stepper

controller

12 V

Battery

P2

P4 (part)

LED

Mains

AT-10 2

Article Number 2. 540 028

SCHILLER AG 2002

control

ON / OFF

SI2

+Batt

Voltage sense

+US

voltage regulator

Battery charger &

SI1

Rectification

Mains

connector

OFF from CPU

+U

Overvoltage

+5.2V

MON

Motor running

ON from keyboard

protection

+24V

protection

Undervoltage

+US

-5Vi

+5Vi

-10Vi

Power rail

stabilisation

PATIENT ISOLATION (4kVrms)

DC - DC

converter

+5.2Vi

2Vi
+

DC - DC

converter

reference

-5Vi

voltage

CTRL

MUX

Signal

(PWM)

multiplexer

Input ampli-

fier and filter

P1

Patient

connector

2.3

AT-102 Service Handbook

MK 18 - 1 Main Board

Power Supply

The mains supply is full wave rectified to produce an unregulated dc supply of

approximately 30 V (+U). This voltage is used by a switched voltage generator to produce

+UD (13.5V). +UD charges the battery when mains is connected. When mains is not

connected, +UD is the battery voltage.

An ON/OFF control logic switches +UD to three voltage regulators. The unit is switched on

directly from the keyboard and then held on from the CPU. Detection of overvoltage on

either the 5.2 V or 24 V supplies directly switches the unit off. Similarly when an

undervoltage is detected on +US (indicating overcurrent) the unit is directly switched off.

The mains LED is lit directly when mains is connected. The same circuit also monitors the

switched dc supply (+US) and activates signal +BATT when the unit is switched on and

mains is not connected (i.e. the unit is running on battery power).

A Battery low signal (BLOW) is set to logic 0 when battery voltage (+US) falls to 11.3 V. A

circuit compensates for voltage drop when the printer stepper motor is active and the BLOW

signal is active only at 10.3 V.

The battery voltage is also monitored directly by the CPU which switches the unit off when

the voltage falls below approximately 9.4 V.

Program and ECG Memory

A FLASH EPROM (electrically erasable) contains the unit software (512 kByte) and the

stored ECG data. The two memory blocks can be independently erased. It is possible to

update the software via the RS-232 serial interface.

The a serial EEPROM stores the unit base settings.

Thermal Print Head Controller

The Thermal Print Head is controlled by a print head controller and a CPU timer circuit. The

print head controller serialises the data for the print head and the timer circuit controls how

long current is applied to the head, and thus the intensity of the printout.

2.4

AT-102 Service Handbook

Functional Overview

MK 18 - 1 Main Board

Printer Timing

Strobe generation is controlled by the CPU when one complete pixel line of data is ready to

be written. Pulse length of STRB1 and STRB2 (each of which controls half of the pixel

array) depends from TPH temperature and so form the pulse width of the TPHT signal.

Paper Mark

The pulsed paper mark signal from the printer is fed to a comparator. A detected papermark

sets PMARK at the output of comparator (U44), to logic 0.

Power On Reset

Section 2

The Power on reset circuit controls the master reset of the CPU. This circuit has two

functions as follows:

 To provide a delay on initial switch-on to ensure that the power supply is fully

stabilized and give the 200ms reset time required by the 68332 processor.

 To disable the unit if the +5V rail drops below +4.75V.

Stepper Motor Controller

The printer stepper motor controller sets the speed of the printer motor with a clock

frequency dictated by the master CPU.

The purpose of the stepper motor controller circuit is to ensure that the motor speed

requested by the microprocessor is achieved and maintained.

ECG Isolated Power Supplies

DC/DC converter circuits produce all the isolated power voltages required by the ECG

Amplifier circuit.

The -2.0Vi and the 2Vi isolated reference voltages are generated from the -5Vi supply.

Note: When taking measurements always ensure that the isolated ground is used for

reference.

Article Number 2. 540 028

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2.5

AT-102 Service Handbook

MK 18-1 Main Board (cont.)

ECG Signal

The incoming ECG signals RA, LA, and C1 to C6 are low-pass filtered and applied to non-

inverting operational-amplifiers giving a gain of 11. The signals are further band pass filtered

(approximately 0.05 Hz to 470Hz) and amplified by 23 before being applied to the

multiplexer.

The multiplexer sampling rate is 1000Hz.

Noise Damping

The right leg electrode to the patient is the signal ground reference signal. To assist in

cancelling some patient noise and thus reducing incoming signal distortion, the incoming

signal from the patient left leg electrode is phase shifted 180

then used by the signal ground reference to cancel (or reduce) patient induced noise.

o

. This phase shifted signal is

RS-232 Interface

This is a standard RS-232 / V.24 interface connected to the MK 18-10 main board. The

communications controller contains a USART and interface circuit which performs the

parallel / serial and serial / parallel conversion for the transmission and reception of data

and provide signal level compatibility with RS-232 standard.

External Modem

An external modem can be connected to the RS-232 output from the AT-102 and be used

for transmitting memory contents over a telephone line.

2.6

AT-102 Service Handbook

Functional Overview

Top Assembly

LCD Screen

The LCD power supply produces the high voltage for the LCD backlight and the contrast

voltage. LCD data is stored in a video RAM and the LCD controller converts the data to the

proper form for the LCD screen.

Alphanumerical Keyboard

The keyboard is a matrix style circuit which is periodically scanned by the processor via the

keyboard interface circuit. It is an integral part of the top assembly and can not be

individually replaced.

Section 2

Article Number 2. 540 028

SCHILLER AG 2002

2.7

AT-102 Service Handbook

2.8

AT-102 Service Handbook

Section 3

Fault Finding

Section 3

Fault Finding

.

Article Number 2. 540 028

SCHILLER AG 2002

3.1

AT-102 Service Handbook

Introduction

The AT-102 is designed to be simple to use and simple to service: the service philosophy of

the AT-102 is module and board replacement (no details are given in this book for board

repair). The purpose of this chapter is to provide fault-finding procedures that will quickly

and efficiently identify a fault to a specific module. Fault-finding procedures are designed so

that test equipment is kept to a minimum.

The AT-102 contains the following modules:

 MK 18-1 Main Board including main and LCD power supplies

 LCD screen assembly

 Alphanumerical keyboard (integral part of the top assembly)

 Printer assembly

 Paper tray motor

An initial fault-finding table is provided detailing general fault indications. Use the

procedures on the following pages to indicate a faulty area or module. In most cases the

fault finding tables should indicate the most likely faulty area. When more than one module

is stated, the first module given is the one most likely to contain the fault. Other modules

given should be checked in the order given. When a module has been replaced specific test

parameters and setting-up of the module may be applicable. The removal and replacement

instructions for all replaceable modules, along with any setup or check procedures

required, are given in Chapters 4 and 5.

If the initial fault-finding table does not indicate the area where the fault exists, re-check all

the settings and parameters that have been entered. If these are correct, check the

software.

General Check Procedures

The procedure detailed here is a general confidence check of the unit after an internal

module or board has been replaced. It is not a full functional test (which can only be carried

out with dedicated equipment in the factory) but is intended to provide a general confidence

check in all the major AT-102 functional areas. The instructions given here are guides to the

basic functions. If more operating information is required (general settings, comprehensive

menu guides etc.) please refer to Chapter 1 in this publication or the AT-102 user guide.

3.2

AT-102 Service Handbook

Fault Finding Chart

CONNECT MAINS

TO THE UNIT

AND SWITCH ON

DISCONNECT THE MAINS

NO

IS THE GREEN MAINS

LED LIT?

YES

PRESS THE

<ON> KEY

SUPPLYAND CHECK THE

MAINS FUSES (IN THE

MAINS MODULE)

FUSE OK?

YES

GO TO FAULT DIAGNOSIS

(SHEET B - POWER PRO-

BLEMS)

ENSURE THAT THE

VOLTAGE SELECTOR IS

NO

CORRECTLY SET.

REPLACE THE MAINS

FUSE AND SWITCH THE

MAINS ON

FUSE OK?

INVESTIGATE THE REASON

FOR THE RUPTURED FUSE

YES

CHECK THE BATTERY, THE

NO

BATTERY LEADS A NDTHE

BATTERY CONNECTORS

FOR SHORT CIRCUITS.

REPLACE FUSE AND

SWITCH ON. IF THE FUSE

IS STILL RUPTURING

REPLACE THE MAINBOARD

GO TO FAULT DIAGNOSIS

(SHEET A - POWER PRO-

Section 3

Fault Finding

BLEMS)

DOES THE LCD LIGHT?

YES

A

SHEET

TWO

Article Number 2. 540 028

SCHILLER AG 2002

NO

GO TO FAULT DIAGNOSIS

(SHEET C - GENERAL PRO-

BLEMS)

NOTE:

The removal and replacement instructions and the location of all boards, cable
assemblies and connectors are given in Chapter 4.

AT-102 Initial Fault Diagnosis Chart (Sheet 1)

3.3

AT-102 Service Handbook

A

FROM

SHEET

ONE

IS THE

LCD)

READABLE ?

YES

ARE STRAIGHT

LINE ECG TRACES

DISPLAYED ON THE

LCD ?

YES

PRESS

<PRINT SCREEN>. DOES

THE PRINTER FUNCTION

ATALL?

YES

NO

CHECK THE LCD

CONTRAST CONTROL .

DISPLAYS DATA ?

YES

NO

CHECK CABLE ASSEMBLIES

NO

MONITOR

NO

REPLACE THE

MAIN BOARD

REPLACE THE

MAIN BOARD

CHECK CABLE ASSEMBLY

FROM MAIN BOARD TO

PRINTER. CHECK POWER

SUPPLYTO MOTOR

REPLACE:

1. MAIN BOARD

2. THERMAL PRINTER

ARE ECG TRACES

DISPLAYED ON

THE LCD?

YES

PRESS THE <AUTO START>

KEY AND WAIT FOR THE

PRINT-OUT

DOES THE PRINT-

OUT GIVE THE ECG

TRACES AND PATIENT

DATA?

YES

DOES THE EXERCISE

TEST FUNCTION?

YES

DOES THE SPIROMETRY

TEST FUNCTION?

NO

NO

NO

NO

PROBLEMS). IF THE PO-

1. CHECK SETTINGS

(SECTION 1) FOR FORMAT,

DATA, PRINTER, ETC.

3. CHANGE THE MAIN

GO TO FAULT DIAGNOSIS

EXERCISE MODE PRO-

GO TO FAULT DIAGNOSIS

SPIROMETRY PROBLEMS)

GO TO FAULT DIAGNOSIS

CHART (SHEET B - POWER

WER SUPPLY IS OK

REPLACE THE MAIN

BOARD

2. CHECK PRINTER
(SHEET D)

BOARD

CHART( SHEET F -

BLEMS)

CHART (SHEET G -

3.4

PRINTER MOTOR

FUNCTIONED?

YES

IS THE

PRINT QUALITY

GOOD? IS THE PRINTER

FUNCTIONING

CORRECTLY?

YES

CONNECT A PATIENT SIMU-

LATOR TO THE ECG

CONNECTOR AND SWITCH

ON

AT-102 Initial Fault Diagnosis Chart (Sheet 2)

GO TO FAULT DIAGNOSIS

NO

CHART (SHEET B - POWER

PROBLEMS). IF THE PO-

WER SUPPLY IS OK CHECK

THE PRINTER MOTOR.

NO

GO TO FAULT DIAGNOSIS

PRINTER PROBLEMS)

CHART (SHEET D -

YES

DO THE RS INTERFACES

FUNCTION?

YES

DOES THE PAPER

TRAY EJECTION WORK

CORRECTLY?

YES

CHECK ALL PARAMETER

SETTINGS. CHECK THE

TEST SCREEN AND

ENSURE THAT PARAME-

TERS ARE IN TOLERANCE.

CONTACT SCHILLER IF

FAULT CANNOT BE FOUND

NO

NO

GO TO FAULT DIAGNOSIS

COMMUNICATION PRO-

BATTERIESARE FULLY

CHARGED. REMOVE THE

PAPER TRAYAND ENSURE

THAT THE MECHANICAL

JAMMED. CHECK THE DC

1. THE PAPER TRAY MOTOR

2. THE INTERFACE BOARD

CHART (SHEET H -

BLEMS)

ENSURE THAT THE

WORMDRIVE IS NOT

MOTOR FOR OPEN
CIRCUIT. CHANGE:

AT-102 Service Handbook

MAINS FUSE RUPTURED

REMOVE THE TOPASSEMBLY .

VISUALLY INSPECTALL CABLE

ASSEMBLIES AND

CONNECTORS. ENSURE THAT

ALL CONNECTORS ARE SECURE.

LOOK IN THE AREA OF THE

TRANSFORMER AND MAINS

INPUT FOR SIGNS OF BURNING

OR SCORCHING.

Section 3

Fault Finding

ARE ALL THE CABLE

ASSEMBLIES AND

CONNECTORS OK?

YES

DISCONNECT THE FLYING

LEADS FROM THE MAINS

TRANSFORMER TO THE

POWER SUPPLY. REPLACE

THE MAINS FUSE AND

SWITCH ON.

IS THE MAINS FUSE

OK?

YES

NO

NO

RECTIFY THE CAUSE OF
THE PROBLEM. REPLACE
FAULTY COMPONENT(S).

DISCONNECT THE

INTERNAL CABLES TO THE

MAINS ASSEMBLY. REPLACE

THE MAINS FUSE AND

SWITCH ON.

IS THE MAINS FUSE

OK?

YES

NO

SHORT CIRCUIT IN THE

MAINS ASSEMBLY.

REPLACE THE MAINS

ASSEMBLY

SHORT CIRCUIT IN THE

POWER SUPPLY. REPLACE

THE MAIN BOARD

SHORT CIRCUIT IN THE
MAINS TRANSFORMER.

REPLACE THE MAINS

TRANSFORMER

AT-102 Fault Diagnosis Chart (Sheet A - Power Problems)

Article Number 2. 540 028

SCHILLER AG 2002

3.5

REMOVE THE TOP

ASSEMBLY. VISUALLY

INSPECT ALL CABLE

ASSEMBLIES AND
CONNECTORS. ENSURE
THATALL CONNECTORS

ARE SECURE. CHECK THE

CABLE ASSEMBLY FROM

THE POWER SUPPLYTO

THE TOPASSEMBLY.

AT-102 Service Handbook

ARE ALL THE CABLE

ASSEMBLIES AND

CONNECTORS OK?

YES

CONNECT A DVM

ACROSS THE MAINS

TRANSFORMER.

IS THEAC VOLTAGE

READING APPROX.

18 V?

YES

POSSIBLE FAULT IN THE

POWER SUPPLY. CHECK ALL

POWER RAILS.

NO

NO

RECTIFY THE CAUSE OF
THE PROBLEM. REPLACE
FAULTY COMPONENT(S).

REPLACE THE MAINS

TRANSFORMER

3.6

ARE ALL POWER

SUPPLIES OK?

YES

1. REPLACE THE CABLE

ASSEMBLY BETWEEN THE

MAIN BOARD AND THE LCD

(BASE ASSEMBLYTO TOP

ASSEMBLY).

2. REPLACE THE MAIN
BOARD

3. REPLACE THE LCD.

NO

REPLACE THE

MAIN BOARD

AT-102 Fault Diagnosis Chart (Sheet B - Power Problems)

AT-102 Service Handbook

REMOVE THE TOPASSEMBLY. VISUALLY

INSPECT ALL CABLE ASSEMBLIES AND

CONNECTORS. ENSURE THAT ALL

CONNECTORS ARE SECURE.

Section 3

Fault Finding

ARE ALL THE CABLE

ASSEMBLIES AND

CONNECTORS OK?

YES

CHECK ALL POWER

RAILS

ARE ALL POWER

SUPPLIES OK?

YES

CHECK THE LCD CONTRAST CONTROL.

CHECK THE CABLE ASSEMBLY BETWEEN

THE POWER SUPPLYAND THE LCD

(BOTTOM ASSEMBLY TO TOPASSEMBLY).

REPLACE REPLACE THE LCD. REPLACE THE

VIDEO/LCD CONVERTER (MAIN BOARD)

NO

NO

RECTIFY THE CAUSE OF
THE PROBLEM. REPLACE
FAULTY COMPONENT(S).

REPLACE THEMAIN BOARD

AT-102 Fault Diagnosis Chart (Sheet C - General Problems)

Article Number 2. 540 028

SCHILLER AG 2002

3.7

ENSURE THAT GOOD

QUALITY, FRESH PAPER IS

INSTALLED IN THE PAPER

TRAY. CHANGE IF

NECESSARY.

AT-102 Service Handbook

DOES THE

PAPER JAM OR NOT

STOP AT THE

CORRECT

POSITION ?

YES

CHECK AND ADJUST THE

PAPER MARK DETECTOR

AND CURRENT LIMITER

THRESHOLDS AS DETAILED

IN CHAPTER 5.

DOES THE PROBLEM

STILL EXIST?

YES

REPLACE:

1. MAIN BOARD

2. THERMAL PRINTER

CARRY OUT THE PRINTER

NO

CHECK DETAILED IN

CHAPTER 5. REPLACE THE

THERMAL PRINT HEAD IF

NECESSARY

AT-102 Fault Diagnosis Chart (Sheet D - Printer Problems)

3.8

AT-102 Service Handbook

CHECK THAT THE CABLE ASSEMBLYTO THE

STRESS TEST EQUIPMENT IS CORRECTLY

AND FIRMLY CONNECTED TO THE RS-232

NB ENSURE THAT THE

STRESS TEST PARAMETERSARE

CORRECTLY SET (SEE CHAPTER 1

OR AT-102 OPERATING HANDBOOK)

Section 3

Fault Finding

INTERFACE

NB ENSURE THAT THE

STRESS TEST EQUIPMENT IS

FUNCTIONING CORRECTLY

IS A DIGITAL, RS

CONTROLLED STRESS

TEST EQUIPMENT

USED?

YES

CHECK RS INTERFACE

SETTING DETAILED IN

CHAPTER 5

REPLACE: THE MAIN BOARD

NO

ONLY DIGITALLY

CONTROLLED

ERGOMETERS CAN BE

USED WITH THEAT-102

AT-102 Fault Diagnosis Chart (Sheet F - Exercise Mode

Problems)

Article Number 2. 540 028

SCHILLER AG 2002

3.9

REPLACE THE

MOUTHPIECE (SP250)

REPLACE FILTER (SP-260)

CHECK ALL SPIROMETRY

CABLING. ENSURE THATALL

CONNECTIONS ARE

SECURE.

AT-102 Service Handbook

CHECK SPIRO INTERFACE

SETTING DETAILED IN

CHAPTER 5. ENSURE

CORRECT SENSOR

SPECIFIED (SP-250 OR SP260)

ENTER THE SPIROMETRY
MENU (<SPIRO>. ENSURE
THAT THE CALIBRATION IS

CORRECT AND THAT ALL

SETTINGS ARE CORRECT.

SEE AT-102 USER GUIDE

CAN THE

CALIBRATION

PROCEDURE BE

CARRIED OUT?

YES

POSSIBLE OPERATOR

ERROR.

NO

CHANGE

1. MOUTHPICE

2. FLOW SENSOR.

3. MAIN BOARD

3.10

AT-102 Fault Diagnosis Chart (Sheet G - Spirometry

Problems)

AT-102 Service Handbook

LINE/MODEM, RECORD/BLOCK,

PARITY, STOP BITAND THE BAUD

RATE) ARE CORRECT FOR THE

ENTER SETTINSG MENU

CHECK THAT ALL SETTINGS(

APPLICATIONAND ARE THE

SAME IN BOTH DEVICES.

CONFIRM SETTINGS IN

THE RS CHECK

PROCEDURE DETAILED IN

CHAPTER 5.

Section 3

Fault Finding

SETTING CORRECT?

YES

POSSIBLE OPERATOR

ERROR.

CHECK ALL CABLE

ASSEMBLIES. REPLACE IF

NECESSARY

NO

1. CHECK THE +12V AND -12V

2. CHANGE THE MAIN BOARD

SUPPLY VOLTAGES

AT-102 Fault Diagnosis Chart (Sheet H - Communication (RS)

Problems)

Article Number 2. 540 028

SCHILLER AG 2002

3.11

Functional Check

AT-102 Service Handbook

Test Procedure Result

Connect unit to mains supply. Mains indicator (LED) is lit. Check mains fuse on the back panel

Switch the unit on by pressing
the ON key on the keyboard.

Connect an ECG simulator to
the ECG connector on the
side panel and switch ON.

Press the MAN Start key. Six leads are printed and are of

Press AUTO START and wait
approximately 10 seconds for
the printout to commence.

Switch the unit OFF and leave
connected to the mains supply
for 10 hours or more to
charge the battery.

Disconnect the mains and
switch the unit ON.

Run the unit on battery power
for approximately an hour.

Run the unit more than 4hours
on battery power .

If no ECG simulator is connected, a
short audible alarm is generated and
the lead indications in the display
are flashing..

LCD screen comes on and shows
three ECG traces and a number of
status indications.

ECG traces are barely visible

No traces visible on the LCD
screen.

Three ECG traces, heart rate,
sensitivity, time scale and status of
lead connections are shown on the
screen.

good quality.

A preprogrammed printout is
produced.

Battery symbol is shown on the LCD
screen.

Unit fully operational. No
degradation.

Battery symbol does not start
flashing before 4 hours .

Corrective action if result not

OK

and replace if necessary.
If problem remains, replace main board
MK 18-1

Ignore or connect ECG simulator

Check power board, ECG and main
board.

Open the unit and check that the two
wire connection from the power supply
to the LCD assembly is properly
connected (high-voltage backlight). If
problem remains, replace LCD
assembly.

Check that the signal cable from the
main board to the LCD assembly is
properly connected. If problem remains,
check LCD assembly, power, ECG and
main board.

If a lead alarm is flashing, check that
the lead is properly connected

If not, reset to default settings and try
again. Open the case and inspect all
cable assemblies and connectors.
Check printer alignment. Run printer
test (see next page).
Check / replace printer motor.
Replace main board MK 18-1.
Replace paper tray and complete
printer assembly.

If not as programmed, check all
settings. If problem remains, replace
main board MK 18-1.

If not, check battery and replace if
necessary.

If the unit does run for 4 hours on
battery power it indicates a weak
battery. Replace as necessary.

3.12

AT-102 Service Handbook

Thermal Printer Check

To check the printer and to ensure that every pixel is operational, a built-in printer test is

provided. Carry out the printer check from the ECG acquisition screen by pressing the FN

key followed by the MANUAL PRINT softkey:

+

A `wavy line` test printout is given. Other test patterns are available - toggle the test

patterns with the lead arrow keys.

Section 3

Fault Finding

Carefully examine the printout and ensure that all the lines are even and uninterrupted. Any

faulty print-head pixels will be seen as a horizontal white line. Examine the printout for

evenness of print

Faulty pixel shown as a

horizontal line on the test

printout. (exaggerated on

this example for clarity)

If a faulty pixel is detected the printer must be replaced. If the printout is uneven (for

example darker at the top than at the bottom), it indicates that the printer alignment is not

correct. If the printout is too faint or too dark, check the paper; old paper, paper that has

been exposed to light for a long period, or poor quality paper can all adversely effect the

print quality. A too light or too dark printout also indicates that the TPH temperature is

incorrect. Change the Printer.

NOTE:

The ' shelf life' of the printer paper is not indefinite. Old paper, paper that has
not been stored in a cool damp free environment, or paper that has been
exposed to excessive heat can adversely effect the quality of the print.

Article Number 2. 540 028

SCHILLER AG 2002

3.13

AT-102 Service Handbook

Thermal Printer Check

Print Head Alignment and Print Head Tension

The print head tension (the pressure that the print head exerts on the printer paper) is

achieved with two springs exerting pressure on the print head: the print head tension cannot

be adjusted. Similarly print head alignment is fixed and cannot be adjusted. If the print head

tension or print head alignment is not correct change the printer.

Thermal Printer Fault Diagnosis

Possible Printer Problem Corrective Action

Paper jams or does not stop at
correct position.

Printout uneven; Fading at top or
bottom.

Faulty pixel. Clean print head (pixel array) with alcohol.

Printout too faint or too dark;
General quality poor.

Clean paper mark detector with a 70%
alcohol solution. Allow to dry completely.
Ensure that good quality, fresh paper is
installed.
Change the PM detector / Change the
Printer Motor / changes the complete
printer

Check evenness of spring pressure of the
printer to roller.
Check roller for wear and symetry.
Clean print head (pixel array) with alcohol.
Ensure that good quality, fresh paper is
installed. Change the printer, change the
main board.

Replace printer.

Clean print head (pixel array) with alcohol.
Ensure that good quality fresh paper is
installed. Change printer , change main
board.

3.14

AT-102 Service Handbook

RS-232 Interface (and Spiro Check)

There are no specific tests that can be performed on the RS-232 interface. However the RS-

232 (UART) settings can be checked to ensure correct protocol and speed. If a spiro sensor

is connected to the RS-232 connector, the sensor type can be displayed to ensure that it is

the correct type. The Comm test screen is entered for the settings screen:

(MENU) >SETUP > SYSTEM SETTING > TEST and INFO > COMM TEST

Section 3

Fault Finding

You are then prompted to select UART TEST and (only if a spiro sensor is connected to the

RS-232 interface), SPIRO SENSOR.

When UART TEST is selected the current Baud rate, RTS and CTS settings are displayed.

When SPIRO SENSOR is selected the sensor type is displayed (SP-250 or SP-260), and

the software version of the spirometry software.

Article Number 2. 540 028

SCHILLER AG 2002

3.15

AT-102 Service Handbook

3.16

AT-102 Service Handbook

Section 4

Module Removal and Replacement

Section 4

Module Removal and

Replacement

Article Number 2. 540 028

SCHILLER AG 2002

4.1

Remove top

In Base assembly

access to :

AT-102 Service Handbook

assembly

Paper tray

assembly and

motor

Thermal printer

Mains transformer

and connector

In Top assembly

access to :

Main Board MK

18-1

ECG and battery

charge voltage
potentiometers

Remove top

assembly

Battery pack

connectors

4.2

Keyboard

LCD screen

assembly

AT-102 Service Handbook

Module Removal and Replacement

Introduction

This Chapter provides an overview of the procedures to remove and replace the modules that

are spared at service level. The instructions given in this chapter are autonomous, with each

module containing the following:

• The prerequisites that must be fulfilled before removing of the module

• Tools and equipment that are required to remove and replace the module and to carry

out the functional checks and adjustments

• Removal Procedures

• Replacement Procedures

• Checks and Tests that must be carried out after replacement.

Any adjustments, jumper settings, special checks or functional procedures that are

required during a procedure, are detailed in the relevant step.

Section 4

In-text diagrams support the text where required and provide location details of connectors,

test points and adjustment potentiometers.

Specific warnings and cautions are given where applicable. Warnings indicate potential

danger that could cause personal injury. Cautions indicate areas that could cause damage

to the equipment.

If a key operation or menu selection is required, the key sequence required is given in bold

letters. The character (or character string) given is the actual character that is printed on the

key. When a key sequence is provided it must be followed in the order given.

Article Number 2. 540 028

SCHILLER AG 2002

4.3

AT-102 Service Handbook

Safety Notices

WARNINGS

Before commencing any removal or replacement procedures ensure that the mains
power supply is switched off and that the mains cable is removed.

Certain checks and adjustments can only be carried out with the top assembly
removed and with mains connected. When carrying out these procedures beware
that potentially lethal voltages are present.

CAUTIONS

The AT-102 contains static sensitive CMOS components; observe antistatic precau­tions:

When carrying out any maintenance procedures always place the unit on an earthed
antistatic mat.

Personnel must be earthed when handling any boards or components

Always use an antistatic bag when transporting boards or components

The unit is susceptible to abrasion damage. To prevent scratching, always place the
unit on a soft, non-abrasive cloth when carrying out maintenance procedures.

Take care not to place any strain on the connecting ribbon cable when removing the
top assembly. Ensure that the cable assembly is not crimped or twisted and that
the top assembly is not placed on the cable assembly.

Care must be taken when removing and replacing connectors. Never use force.
Never strain the cable assemblies.

The procedural steps given for each module must be followed in the order given.

4.4

AT-102 Service Handbook

Module Removal and Replacement

Physical Overview

The AT-102 unit is enclosed in a two part, medical standard, moulded plastic case.

The top part contains the keyboard and the LCD screen with the base section containing

all the electronics of the unit, the RS-232 interface, the thermal printer, the paper tray, the

battery and mains transformer.

The electronics of the unit are contained on a single double sided printed circuit board,

the main board (MK 18-1 ). This board is secured on spacers moulded in the base

section.

The battery is secured in position in a moulded recess accessed from the bottom of the

units, and the mains transformer is secured on spacers above the printed circuit board.

The thermal printer is mounted on spacers moulded to the base and the paper tray motor

mounted in a similar way.

Section 4

Article Number 2. 540 028

SCHILLER AG 2002

4.5

Exploded View Lower Casing

EMC shield (ECG

Processing Part)

Main Board MK 18-1

DC Motor with

Cable (for

paper tray)

Mains

Transformer

AT-102 Service Handbook

IMPORTANT

Mains Isolation

Shield. This must

placed between

the mains

transformer and

board

EMC shield

Battery

Mains

Connector

Printer

Motor

Paper Tray Worm

Casing Securing

Screws (x6)

Drive

Thermal Print

Head

Paper Mark

Detector

Paper Tray

Printer

Roller

Toothed

Wheel

4.6

AT-102 Service Handbook

Exploded View Upper Casing

LCD

Section 4

Module Removal and Replacement

Article Number 2. 540 028

SCHILLER AG 2002

Recess for LCD

Keyboard Foil

4.7

AT-102 Service Handbook

Prerequisites, Test Equipment, Tools,
and Accessories

The following list gives the tools, test equipment and accessories required to carry out all

removal and replacement procedures, functional tests, calibration procedures and

adjustments that can be carried out on the AT-102. The test equipment given here is

general. If specific recommendation for test equipment is required, please contact the

SCHILLER service department.

 Digital Voltmeter

 Selection of cross-bladed, posi-drive and flat-bladed screwdrivers

 Cleaning agent such as Trichlorethylene

 Selection of spanners

 Flat ended pliers

 Double-sided tape

 ECG Patient Simulator, e.g. phantom 320.

 SCHILLER Patient Cable

 Low abrasion antistatic mat

General Prerequisites

 The unit must be placed on an antistatic mat and antistatic precautions observed

when any maintenance is carried out on the AT-102. The room temperature should be

between 18 and 28 degrees.

 The safety notices at the beginning of this section must be read and understood

before carrying out any of the removal and replacement procedures detailed here.

Part Numbers

The part numbers for all replaceable items are given in Chapter 6.

4.8

AT-102 Service Handbook

Module Removal and Replacement

Opening and Closing the Case

Top Assembly Removal

The Top Assembly is secured to the base assembly with seven recessed screws. Access

to the screws is gained from the underside of the unit. To remove the Top Assembly,

proceed as follows

WARNING

Ensure that the mains cable is removed.

1. Turn the unit up-side-down and rest on a soft antistatic cloth.

2. Unscrew and remove the six countersunk retaining screws and washers situated in

the extreme corners and edges of the unit.

4. Grasping the top and bottom of the unit to ensure that the two assemblies cannot

part, carefully return the unit to the standing position.

5. Gently lift the Top Assembly sufficiently to gain access to the interconnecting

cables. Disconnect the cable assembly between the main board MK 18-1 and the

keyboard and the ribbon and dual-wire cable assemblies between the power supply

and the LCD screen board.

6. Gently lift the Top Assembly away from the Base Assembly and place on a soft

cloth.

Section 4

Article Number 2. 540 028

SCHILLER AG 2002

4.9

Opening and Closing the Case

Support the top casing in an

`upright` position to prevent

straining the cable assemblies

and connectors.

AT-102 Service Handbook

4.10

AT-102 Service Handbook

Module Removal and Replacement

Opening and Closing the Case

Top Assembly Replacement

To replace the Top Assembly proceed as follows:

1. Check that all boards and components are firmly secured. Check for loose screws.

Ensure that no screws or foreign bodies are loose in the bottom of the case.

2. Inspect all the internal cable assemblies and ensure that they are in good condition

and that no visible damage can be seen. Ensure that no cable assemblies are

strained, crushed or caught.

3. Ensure that all connectors are firmly home.

4. Position the Top Assembly in front of the Base Assembly and without straining the

ribbon cable, plug in the interconnecting cable from the keyboard to the main board.

Connect the ribbon and the dual-wire cable assemblies from the LCD board to the

power supply part of the main board.

Note: It may be necessary to tilt the Top Assembly for the cable assemblies to

reach.

5. Carefully position the Top Assembly on the Base Assembly.

6. Grasping the two assemblies to ensure that they cannot part, carefully turn the unit

up-side-down and replace the seven securing screws and washers in the extreme

corners and edges of the unit. Return the unit to the upright position.

7. Carry out the functional check procedure detailed in Chapter 3.

Section 4

Article Number 2. 540 028

SCHILLER AG 2002

4.11

Main Board MK 18 - 1

Parts

Main board MK 18-1. Part number as detailed in Chapter 6.

Board Removal

WARNING:

The Warnings and Cautions at the beginning of the chapter must be
observed.

Ensure that the mains cable is removed before commencing

CAUTION:

The main board contains static sensitive components; observe antistatic
precautions.

AT-102 Service Handbook

1. Open the AT-102 casing as described previously, support the top assembly.

2. From the rear of the unit, unscrew the support securing screws.

4.12

AT-102 Service Handbook

Module Removal and Replacement

Main Board MK 18 - 1

3. Carefully hinge the top assembly so that the top assemblies are apart as shown

4. Disconnect all connectors on the board including the live and the neutral bayonet

connectors to the mains connector.

5. Unscrew the securing screws on the top of the board and remove the board.

Section 4

Article Number 2. 540 028

SCHILLER AG 2002

4.13

Main Board MK 18 - 1

Board Replacement

To replace the Main board MK 18-1 proceed as follows:

1. Position the board and secure at the 12 fixing points

2. Reconnect all connecters

AT-102 Service Handbook

P2 (under)

internal battery

P7

Thermal Printer (Motor)

P12

Paper Mark Detector

P11

Thermal Printer (Data)

P5 Blood

pressure Module

(not used)

P15 (under)

P8

LCD (Data)

Ext Printer

Keyboard

P10

P9 (under)

Video (VGA)

P16 (under)

Comm Module

(not used)

P13

Paper Tray

Motor

P14 (under)

RS-232

P1 (under)

Patient

4.14

AT-102 Service Handbook

Module Removal and Replacement

Printer Tray and Thermal printer

CAUTION:

The thermal printer contents is static sensitive; observe antistatic precau­tions.

The printer is tensioned with two springs under the retaining bar. Take great
care when removing the four screws not to lose the springs.

Thermal Printer Removal

1. Remove the main board MK 18-1 as described previously.

2. Unscrew the four retaining screws securing the printer in position.

3. Gently remove the printer taking care to retain the two tensioning springs.

Thermal Printer Replacement.

Section 4

To replace the thermal printer proceed as follows:

1. Position the printer in the paper tray/print assembly so that the printer mounting

plate lips slot into the dedicated cutouts in the assembly;

2. Insert the two tensioning springs so that the springs are positioned over the outer

two moulded spring supports and in the indent (hole) in the printer mounting plate

3. Position the printer retaining bar and secure the printer and printer retaining bar with

the four retaining screws. Ensure that the cable assemblies from the printer to the

PCB are not caught and are not strained.

Article Number 2. 540 028

SCHILLER AG 2002

4.15

AT-102 Service Handbook

Battery Pack

Battery Pack Removal

WARNING:

The Warnings and Cautions at the beginning of the chapter must be
observed.

Ensure that the mains cable is removed before commencing

To remove the Battery Pack proceed as follows:

1. Remove the top assembly as detailed previously.

2. Disconnect the two bayonet connectors for the Main board (P2).

3. Gently return the top assembly in position, and firmly holding both parts, turn the unit

up-side-down.

4. Unscrew the battery compartment cover plate retaining screws and remove the

battery.

Checks and Tests After Battery Replacement

Program all static settings which will have been lost when the battery was disconnected

including date and time.

4.16

AT-102 Service Handbook

Module Removal and Replacement

Keyboard

The keyboard comes as a complete assembly with the top casing. The part number of the

keyboard is given in Chapter 6.

Section 4

Article Number 2. 540 028

SCHILLER AG 2002

4.17

AT-102 Service Handbook

LCD screen board

WARNING:

The Warnings and Cautions at the beginning of the chapter must be
observed.

Ensure that the mains cable is removed before commencing

CAUTION:

The main board contains static sensitive components; observe antistatic
precautions.

LCD board Removal

1. Disassemble the top and bottom sections as described previously.

2. Disconnect the data connector and the LCD backlight power connector for the Main

board

3. Unscrew the four retaining screws securing the LCD board in position and remove the

board.

4.18

AT-102 ECG Service Handbook

Section 5

Adjustments

Section 5

Adjustments, System

Upgrades and

Software Updates

Article Number 2. 540 028

SCHILLER AG 2002

5.1

AT-102 Service Handbook

5.2

AT-102 ECG Service Handbook

Introduction

This Chapter provides the procedures necessary to check and adjust all service settings.

Every procedure is self-contained and details the tools required to carry out adjustments,

and the test equipment necessary. Any adjustments, jumper settings, special checks or

functional tests that are required on the module, or on associated modules or software, are

also detailed.

In-text diagrams support the text where required and provide location details of connectors,

test points and adjustment potentiometers.

Specific warnings and cautions are given in the text where applicable.

The part numbers for all replaceable modules are given in Chapter 6.

The AT-102 has the following adjustments:

Section 5

Adjustments

• Battery Charge Voltage (VR3 on the main board MK 18-1)

• ECG Amplifier reference voltage and ramp slope (VR1 and VR2 on the main board

MK18-1)

We recommend that the reference voltages are checked every year.

Article Number 2. 540 028

SCHILLER AG 2002

5.3

Safety Notices and Conditions

WARNINGS

Mains power is potentially lethal - disconnect the mains before disas­sembling the unit and remove the mains cable.

Setting the battery charge voltage requires that mains is connected
during this procedure. Exercise extreme caution. Be aware at all times
hat mains voltage is present.

All other maintenance, calibration, checks, or adjustments must be
carried out with battery power only

CAUTIONS

The AT-102 contains static sensitive cmos components; observe antistatic
precautions. When carrying out any maintenance procedures always place
the unit on an earthed antistatic mat. Personnel must be earthed when
handling any boards or components. Always use an antistatic bag when
transporting boards or components

Care must be taken when removing and replacing connectors. Never use
force. Never strain the cable assemblies.

The procedural steps given for each module must be followed in the order
given.

The outer surfaces of the AT-102 are susceptible to abrasion damage. To
prevent scratching, always place on a soft, non-abrasive cloth.

AT-102 Service Handbook

Conditions

 The unit must be placed on an antistatic mat and antistatic precautions observed

 The room temperature should be between 18 and 28 degrees.

5.4

when any maintenance is carried out on the AT-102.