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Schiller CARDIOVIT AT-2, Service Handbook

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Page 3.4

SCHILLER AT-2 6-Channel ECG Unit

SERVICE HANDBOOK  Issue  2.1  November 1998

Chapter 3

Fault Diagnosis

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-2plus 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 relevant User Manual.

To carry out the general AT-2 functional check procedure, proceed as follows:
1. Connect mains power to the unit and ensure that the green mains LED lights.

2. Switch the unit on by pressing the 

 key on the keyboard. Ensure that the LED lights

flash for about a second.

3. Carry out the printer check detailed on the next page.

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

5. Press the 

 key and ensure that six leads are printed and are of good quality.

6. Press the 

 key and wait approximately 10 seconds for the printout to commence.

Ensure that the printout is accurate and of good quality.

7. Switch the unit off 

 and leave connected to the mains supply for 10 hours or more to

charge the battery.

8. Disconnect the mains and switch the unit on. Ensure that the Battery LED is lit. Run the

unit on battery power for approximately an hour. Ensure that the battery LED flashes when

the battery has limited capacity (not before 6 hours).

Summary of Contents for CARDIOVIT AT-2

Page 1: ... Issue 2 1 November 1998 AT 2 6 Channel ECG unit Service Handbook SCHILLER AG Altgasse 68 CH 6340 Baar Switzerland Phone 41 41 766 42 42 Fax 41 41 761 08 80 Home page http www schiller ag ch June 1998 Article Number 2 540 010 Operator Manual Cardio Menu ...

Page 2: ...nd software Issue 2 1 November 1998 minor corrections incorporated including new schematic Associated Documents Guide to the SCHILLER Interpretation and Measurement Program E D F Article No 2 510 179 SCHILLER AT 2 User Guide English German French Article No 2 510 100 SCHILLER AT 2 User Guide Italian Spanish Portuguese Article No 2 510 200 Copyright 1998 by SCHILLER AG Windows is a trademark of Mic...

Page 3: ...al device class IIa specified above conforms with the essential requirement listed in Annex 1 of EC Directive 93 42 EEC This declaration is supported by Certificate of approval No 11425 01 ISO 9001 Rev 1994 EN 46001 by SQS 45112 60 01 ISO 9001 08 94 EN 46001 12 93 by DEKRA and 45112 16 01 Annex II Section 3 of the Directive 93 42 EEC 4T Baar Switzerland Dated 20 05 1998 J J Schmid Markus Bütler Re...

Page 4: ...liers Sur Marne France Telephone 33 1 49 41 24 40 Fax 33 1 49 41 24 49 Germany SCHILLER Medizintechnik GmbH Rudolf Diesel Strasse 14 D 85521 Ottobrunn Germany EU Bevollmächtiger Telephone 49 89 629 981 0 Fax 49 89 609 509 0 Hotline 089 62 99 81 36 India Schiller Healthcare India Pvt Ltd Kalpatarn Chambers Nanik Motwane Lane Ground Floor Fort Mumbai 400 023 Telephone 91 22 263 4381 Fax 91 22 263 43...

Page 5: ...his publication without express written permission of SCHILLER AG Terms of Warranty The SCHILLER AT 2 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 ...

Page 6: ...GAMMA RADIATION STERILISATION DO NOT USE SOLVENT CLEANERS 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 THIS UNIT COMPLIES WITH EMC REGULATIONS FOR MEDICAL PRODUCTS WHICH AFFORDS PROTECTION AGAINST EMISSIONS AND ELECTRICAL INTERFERENCE HOWEVER SPECIAL ...

Page 7: ...ENTATIVE THE GUIDELINES FOR PATIENT ELECTRODE PLACEMENT ARE PROVIDED AS ON OVERVIEW ONLY THEY ARE NOT A SUBSTITUTE FOR MEDICAL EXPERTISE THIS 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 PATIENTS OVERALL CLINICAL COND...

Page 8: ...r 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 2 with the main physical attributes of the unit br...

Page 9: ... Index Circuit Diagrams Board layouts The circuit diagrams and component layouts are provided for all boards These details are provided for information only General Symbols We need your help The philosophy of SCHILLER is one of continuous improvement Our aim is to provide the user with the most up to date information and the latest technological developments Your suggestions and comments are welco...

Page 10: ...x SCHILLER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 ...

Page 11: ...er 1 Operating Elements Contents Introduction 1 2 Location Power 1 3 The Keyboard 1 4 AT 2 Short Form Operating Instructions 1 5 Modes of Operation 1 6 Automatic Mode 1 8 Manual Mode 1 9 Settings 1 10 Automatic Mode ECG Settings 1 18 Care Maintenance 1 22 Replacing the Recording Paper 1 23 Thermal Paper Handling 1 24 ...

Page 12: ...lead group and lead off indications In addition any detected disturbance i e loose electrode or end of paper gives an audible alarm and the corresponding indicator lamp flashes The AT 2 includes the following features Low weight and compact dimensions Large A4 size printout from integrated quality thermal printer Built in rechargeable battery for mains independent use 4hrs normal use or 300 printo...

Page 13: ...tor lamp When battery capacity is limited the battery symbol flashes on and off To recharge the battery connect the apparatus to the mains supply by means of the supplied power cable A totally discharged battery needs less than 15 hours to be fully recharged 60 in less than 3 hours 90 in less than 7 hours A fully charged battery gives approximately 6 hours of normal use The unit can remain connect...

Page 14: ...Page 1 4 SCHILLER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Chapter 1 Operating Elements The Keyboard ...

Page 15: ...Short Form Operating Instructions Manual ECG Recording Rhythm Strip Prepare skin hook up patient Switch unit on press ON Press MAN START Change lead group with Press STOP to stop the printout Electrode hook up check Press for print out of electrode dc offsets Best results are obtained when the electrode voltage readings right column are between 50mV Filter On Off Press to switch the Myogram filter...

Page 16: ...ng of all 12 leads with a choice of 2 different formats The following can be programmed freely for each of the 2 formats before recording Lead Format Chart Speed With the optional interpretation program installed it is also possible to select the measurement table average cycles with optional markings and interpretation statements for the printout For further information see paragraph Settings for...

Page 17: ...vember 1998 Modes of Operation cont Manual Mode Manual Mode provides a real time print out of 6 selected leads The following can be freely selected before or during recording Lead Group Chart Speed Sensitivity Myogram Filter For further information see paragraph ECG Recording in Manual Mode following ...

Page 18: ...aces To start the automatic ECG recording in Format 1 press the AUTO key To start the automatic recording in the second format press the ALT key followed by the AUTO key The printout gives the following ECG recording of all leads in either Standard or Cabrera format according to selection Sensitivity Heart Rate Speed Filter Settings Time and Date Interpretation statements Average Cycles Intervals ...

Page 19: ... filter settings if on At the top the heart rate as current average of 4 beats trace sensitivity The following can be freely chosen during or before the recording Lead Group by means of the LEAD FORWARD and LEAD BACKWARD key The following lead groups are selectable I II III aVR aVL aVF Cabrera aVL I aVR II aVF III V1 V2 V3 V4 V5 V6 II aVF III V2 V4 V5 V4 V5 V6 V7 V8 V9 Chart Speed Select speed 5 2...

Page 20: ...function is only active for 4 seconds If a programming key is not pressed within 4 seconds the unit reverts to standard mode The ALT key must again be pressed to activate the programming mode The setting is remembered and the keyboard released for other functions when the STOP key is pressed Once a setting has been confirmed it is stored in the memory even when the unit is switched off Example If ...

Page 21: ...t Leads Standard S or Cabrera C ECG Format Long ooo Short o or Suppressed MECG Average cycles as defined in auto ECG recording setup e g 4 3 25 mm s 2 Measurements Enabled or Suppressed Marks Enabled or Suppressed Interpretation Enabled or Suppressed Selected Rhythm leads Leads selected for R1 R2 resp Automatic Centering Enabled or Suppressed Printout of signals Sequential or Simultaneous Baseline...

Page 22: ... SCHILLER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Chapter 1 Operating Elements Settings cont Default Settings To reset the unit to the basic default settings proceed as follows ALT 0 6 6 ...

Page 23: ...nit SERVICE HANDBOOK Issue 2 1 November 1998 Settings cont Language The language is selected as follows Confirm the selection by pressing STOP Notes The difference between English and American is the mains filter setting English 50Hz American 60Hz and the physical units ...

Page 24: ...as follows Confirm the selection by pressing STOP 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 Mains Filter The Mains filter is an adaptive digital interference filter designed ...

Page 25: ... 35 Hz is displayed on the bottom line of the printout Confirm the selection by pressing the STOP key STOP The myogram filter is switched on and off manually with the FILTER KEY 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 in the bottom information line of the printou...

Page 26: ...electable printout forms are Simultaneous All ECG leads are printed in the same time segment in automatic mode only Sequential Each group is a contiguous time segment of approximately 2 5 or 5 seconds in automatic mode only Auto Centering ON All ECG traces are centred dynamically for optimal use of paper width Auto Centering OFF ECG traces are set to a fixed baseline position and may possibly over...

Page 27: ...an be switched on or off at any time by pressing the QRS BEEP key Time Date The required settings can be selected as follows Note If the battery has been disconnected more than half an hour the clock oscillator must be restarted before setting the time To do this the following ke sequence must be pressed ALT 9 9 9 2 1 0 This will start the oscillator and the time can be set ...

Page 28: ...ined for the AT 2 When defining auto format 1 the key sequence ALT 1 precedes the setting When defining auto format 2 the key sequence ALT 2 precedes the setting The automatic mode formats are detailed on the following pages The ECG format is set as follows Average Cycles The Average cycles are defined as follows Note Lead selection for the rhythm lead s are defined on page 21 ...

Page 29: ...erating Elements SCHILLER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Automatic Mode ECG Settings cont Measurements and Markings C version only To define the measurements and markings proceed as follows ...

Page 30: ...tation option are given in the SCHILLER ECG Measurement and Interpretation booklet art No 2 510 179 Interpretation Settings C version only 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 defined 30 or 30 and if low or high sensitivity should be applied Lo...

Page 31: ...ssue 2 1 November 1998 Automatic Mode ECG Settings cont Selecting Rhythm Leads The rhythm leads are printed out as defined Two separate rhythm leads can be selected The following formats can be set The 2 rhythm leads are defined as follows Confirm the selection by pressing the STOP key STOP ...

Page 32: ...NT ANYONE STUMBLING OVER THEM OR ANY DAMAGE CAUSED BY THE WHEELS OF INSTRUMENT TROLLEYS The patient cable should not be exposed to excessive mechanical stress Whenever disconnecting the leads hold the plugs and not the cables Store the leads in such a way as to prevent anyone stumbling over them or any damage being caused by the wheels of instrument trolleys The cable can be wiped with soapy water...

Page 33: ..._fUb Q Ub WbYT cYTU e Q Ub dbQi bU UQcU RQb Q Ub b_ Ub Place fingers under the retaining bar and pull directly upwards The paper tray cover releases Withdraw the cover from the unit DO NOT FORCE THE PAPER TRAY COVER RUNS FREELY OVER THE DEDICATED RUNNERS Remove any remaining paper from the paper tray Place a new paper pack into the paper tray with the printed grid side facing upwards Place the beg...

Page 34: ...points are remembered the paper will give reliable results The following points apply to both storage and when archiving the results 1 Before use keep the paper in its original cardboard cover Do not remove the cardboard cover until the paper is to be used 2 Store in a cool dark and dry area 3 Do not store near chemicals e g sterilisation liquids 4 In particular do not store in a plastic cover 5 C...

Page 35: ...apter 2 Functional Overview Contents Introduction 2 2 Main Board MK 12 1 2 4 Power Supply 2 4 CPU and processing circuits 2 4 Memory 2 4 Thermal Print Head Controller 2 4 Printer Timing 2 4 Paper Mark 2 5 Power On Reset 2 5 Stepper Motor Controller 2 5 ECG Isolated Power Supplies 2 5 ECG Signal 2 5 Noise Damping 2 5 ...

Page 36: ...ter 2 Functional Overview Introduction This chapter provides a functional overview of the AT 2 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 ...

Page 37: ...filter DC AC converter 400 kHz 5Vi 2Vi 5Vi 5Vi 10Vi 5 2Vi 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 Patient connector PATIENT ISOLATION 4kVrms Voltage regulator Voltage regulator Switching voltage reg 5V ref 5 2V 24V Overvoltage protection Undervoltage protection Voltage sense conversion MON Motor running BLOW 10 3V MON US ON OFF control Battery charger voltage regulator Rectification Voltage sens...

Page 38: ...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 Note The battery voltage is also monitored directly by the CPU which switches the unit off when the voltage falls below approximately 9 4 V CPU and processing circuits Overall control and coordination of the AT 2 is by 68331 CPU working in conjunction with a custom speci...

Page 39: ...eed 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 ECG Signal The incoming ECG sig...

Page 40: ...Page 2 6 SCHILLER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Chapter 2 Functional Overview ...

Page 41: ...LER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Chapter 3 Fault Diagnosis Contents Introduction 3 2 Fault Diagnosis Chart 3 3 General Check Procedures 3 4 Printer Check 3 5 Print Head Alignment and Print Head Tension 3 5 ...

Page 42: ... 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...

Page 43: ...Page 3 3 Chapter 3 Fault Diagnosis SCHILLER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Fault Diagnosis Chart ...

Page 44: ...nctional check procedure proceed as follows 1 Connect mains power to the unit and ensure that the green mains LED lights 2 Switch the unit on by pressing the key on the keyboard Ensure that the LED lights flash for about a second 3 Carry out the printer check detailed on the next page 4 Connect an ECG simulator to the ECG connector on the side panel and switch on 5 Press the key and ensure that si...

Page 45: ...dicates that the printer alignment is not correct If the printout is too faint or too dark check the TPH temperature in the self test printout given in Chapter 5 Also 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 NOTE THE SHELF LIFE OF THE PRINTER PAPER IS NOT INDEFINITE OLD PAPER PAPER THAT HAS NOT...

Page 46: ...Page 3 6 SCHILLER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Chapter 3 Fault Diagnosis ...

Page 47: ...4 5 Exploded View Base Assembly and Printer 4 6 Exploded View Paper Feed 4 7 Opening the Case 4 8 Top Assembly Replacement 4 9 Printer Tray Assembly and Thermal Printer 4 10 Thermal Printer Removal 4 10 Thermal Printer Replacement 4 11 Main Board MK 12 1 4 12 Board Removal 4 12 Board Replacement 4 12 Battery Pack 4 13 Battery Pack Removal 4 13 Battery Pack Replacement 4 13 Checks and Tests After B...

Page 48: ...2 1 November 1998 Chapter 4 Module Removal and Replacement Remove top assembly Paper tray assembly and motor Board MK 12 1 Mains trans former and connector Battery pack Thermal printer Remove top assembly Keyboard In Base assembly access to In Top assembly access to ...

Page 49: ...s 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 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 War...

Page 50: ...89012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 1234567890123456...

Page 51: ...n a moulded recess and the mains transformer is secured on spacers above the printed circuit board The thermal printer is mounted on a paper tray thermal printer assembly which is secured in the base section complete Test Equipment Tools and Accessories The following list details the tools test equipment and accessories required to carry out all functional tests calibration procedures and adjustme...

Page 52: ...Page 4 6 SCHILLER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Chapter 4 Module Removal and Replacement Exploded View Base Assembly and Printer ...

Page 53: ...Page 4 7 Chapter 4 Module Removal and Replacement SCHILLER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Exploded View Paper Feed ...

Page 54: ...e Top Assembly is mounted on the Base Assembly and is secured to the Base Assembly with seven 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 upsidedown and rest on a soft antistatic cloth 2 Unscrew and remove the seven countersunk retaining screws and washers situated ...

Page 55: ...ble 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 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...

Page 56: ...the motor are given in Chapter 6 CAUTION THE THERMAL PRINTER CONTENTS IS STATIC SENSITIVE OBSERVE ANTISTATIC PRECAUTIONS Printer Paper tray Assembly Removal 1 Remove the following connectors from the Main board MK 12 1 data connector to the thermal printer paper mark connector printer motor connector earth connector 2 Unscrew the six retaining screws and remove the complete paper tray printer asse...

Page 57: ...ring 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 Printer Paper tray Assembly Replacement 1 Position and secure in the base the assembly with the six retaining screws 2 ...

Page 58: ...apter 6 Board Removal WARNING ENSURE THAT THE MAINS CABLE IS DISCONNECTED BEFORE COMMENCING 1 Disconnect the following connectors live and the neutral bayonet connectors to the mains connector battery connector 2 Unscrew the 12 spacer fixations four on the mains transformer and remove the board Board Replacement To replace the Main board MK 12 1 proceed as follows 1 Position the board and secure a...

Page 59: ... remove the Battery Pack proceed as follows 1 Ensure that the unit is switched off and that the mains is disconnected 2 Disconnect the two bayonet connectors and remove the Battery Pack by gently pulling away from the base Battery Pack Replacement 1 Position the Battery Pack with the connectors towards the outside of the unit 2 Connect bayonet connectors Checks and Tests After Battery Replacement ...

Page 60: ...6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Chapter 4 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 ...

Page 61: ...hapter 5 Adjustments Contents Introduction 5 2 Warnings Cautions and Conditions 5 3 Test Equipment 5 4 Main Board MK 12 1 Adjustment Locations 5 5 Battery Charge Voltage 5 6 Paper mark Detector Check 5 7 ECG Amplifier 2V 2V and PWM Ramp Time Adjustment 5 8 Service Printout 5 9 Software Options Updates 5 11 ...

Page 62: ...ated 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 2 has the following adjustments Battery Charge Voltage VR1 on the main board M...

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Page 64: ... on the AT 2 The list of proprietary equipment is not comprehensive Recommendations of suitable proprietary test equipment can be obtained from the SCHILLER Service Department Proprietary Test Equipment Tools ECG Emulator e g Phantom 320 Oscilloscope Digital Multimeter Standard tool kit with a selection of cross bladed flat bladed and posi drive screwdrivers pliers and general tools SCHILLER 10 le...

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Page 66: ...AN EARTHED ANTISTATIC MAT PERSONNEL MUST BE EARTHED WHEN HANDLING THE UNIT EXERCISE CARE WHEN REMOVING AND REPLACING CONNECTORS NEVER USE FORCE NEVER STRAIN THE CABLE ASSEMBLIES Disassemble the unit as detailed in Chapter 4 and remove Printer and printer tray assembly Remove the Main board MK 12 1 from the assembly and remove the microprocessor EMC shield from the board Replace the board in positi...

Page 67: ...tor with a 70 alcohol solution Allow to completely dry Disassemble the unit as detailed in Chapter 4 Reconnect the keyboard to the Control board and place the top assembly on its side in front of the Base assembly Switch the unit on and set the speed of the printer to the slowest setting of 5mm s 5mm s key Press the MAN START key to activate the printer The paper is now moving at low speed through...

Page 68: ...BE EARTHED WHEN HANDLING THE UNIT EXERCISE CARE WHEN REMOVING AND REPLACING CONNECTORS NEVER USE FORCE NEVER STRAIN THE CABLE ASSEMBLIES Disassemble the unit as detailed in Chapter 4 and remove the Printer tray assembly Remove the Main board MK12 1 from the assembly and remove the microprocessor EMC shield from the board Replace the board in position Reconnect the keyboard to the control board and...

Page 69: ...e following key sequence ALT 0 3 any number 0 6 ECG Reference Voltage This provides measurements and setting facilities for the reference voltage used for accurate measurement of ECG signals Uref This gives the value of the reference voltage used in the multiplexer circuit on the ECG Amplifier The value of the reference voltage is 2000 mV 20 mV Uref This is a negative reference voltage used on the...

Page 70: ...pen circuits The measured voltage value will depend on where the electrodes are connected The voltage readings that can be expected are as follows With patient connected 100mV With patient simulator connected 20 mV this will depend on the patient simulator used and must be taken as a flexible measurement With all electrodes shorted together 20 mV No patient cable connected 350 to 450mV TPH TEMP Th...

Page 71: ...ttings press the following key sequence ALT 0 1 any number 0 9 Details of all settings are given in Chapter 1 of this book or in the AT 2 User Guide Installing Software Options To upgrade the AT 2 from standard to C version type the following ALT 0 4 upgrade code obtainable from SCHILLER Acceptance of the code is indicated by a series of beeps CAUTION MORE THAN 10 ATTEMPTS TO ENTER THE INCORRECT C...

Page 72: ...Page 5 12 SCHILLER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Chapter 5 Adjustments ...

Page 73: ...Page 6 1 Chapter 6 Spare Parts SCHILLER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Chapter 6 Spare Parts Contents Spare Parts 6 3 ...

Page 74: ... SCHILLER products The address for advice is SCHILLER AG Sales Department Order Processing Altgasse 68 6340 Baar Switzerland Phone Number 41 41 766 42 42 Fax Number 41 41 761 08 80 When ordering state that the order is for an AT 2 unit and provide the following Part Description Part Number Your Address Service Department If you need help from our service engineers please contact the following numb...

Page 75: ...Page 6 3 Chapter 6 Spare Parts SCHILLER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Spare Parts ...

Page 76: ...Page 6 4 SCHILLER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Chapter 6 Spare Parts ...

Page 77: ...Page 7 1 Chapter 7 Technical Data SCHILLER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Chapter 7 Technical Data Contents Technical Data 7 2 Available Configurations 7 3 ...

Page 78: ...mal print head 8 dots per mm Recording Tracks 6 channels positioned at optimal width on 200 mm automatic baseline adjustment Automatic Lead Programs 6 channel representation of 12 simultaneously acquired standard leads Data Record Listing of ECG recording data Version C ECG measurement results intervals amplitudes electrical axes Sokolow Index average complexes with optional measurement reference ...

Page 79: ...omplying with the following RL 93 42 EEC EN 60601 1 1990 IEC 601 1 IEC 601 2 25 1993 pr EN 1441 1994 EMC CISPR 11 1985 EN 55011 1992 IEC 801 2 1991 IEC 801 3 1984 IEC 801 4 1988 IEC 801 5 Safety Class I according to IEC 601 1 with internal power supply IIa according to RL 93 42 EEC CE 0124 This device is not designed for outdoor use IP 20 Environmental Conditions Temperature Operating 10O to 40O C...

Page 80: ...Page 7 4 SCHILLER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Chapter 7 Technical Data ...

Page 81: ...SCHILLER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Page 8 1 Chapter 8 Glossary Chapter 8 Glossary Contents Introduction 8 2 Acronyms 8 3 ...

Page 82: ...n The following list provides a glossary of the important signals and acronyms used in the circuit diagrams for the SCHILLER instruments They will not all apply to the AT 2 Only abbreviations that are specific to SCHILLER equipment are included here General electrical and electronic abbreviations are not included ...

Page 83: ...ther equipment the limits are different CHAD ECG signal multiplexer control signals on the ECG amplifier CIF 0 16 Communication interface General control signals for the communications interface circuits CI 0 10 RS interface control lines input CO 0 10 RS interface control lines output CL1 19 kHz LCD latch pulse CL2 3 11 MHz LCD clock frequency CLK Clock signal The number following the CLK indicat...

Page 84: ...for frame synchronisation of the LCD FPIN Input for floating point co processor FWR Flag read write HREN Output enable signal for thermal print head data History enable HSYNC Horizontal synchronisation video VGA output IPL0 2 Interrupt priority level binary encoded IREG Control signal from the current detector and limiter circuit on the power supply to regulate supply ISYS Interrupt system 2 kHz K...

Page 85: ... enable signal NWTZ Mains supply NMI Non maskable interrupt interrupt for U47 Schiller gate array activated by the reset button OFF Off signal from the OFF key to switch off the power supply PDS Control signal derived from FLM unity waveform 1 2 FLM frequency PM Paper mark signal PMARK Paper mard detection signal PMPON Pacemaker detection pulse PMNEG Pacemaker negative indicates the trailing edge ...

Page 86: ...r TPDUR Thermal printer duration duration of the strobe pulse dependant on the ambient temperature of the print head and the resistance of the print head TPCSEL Thermal printer controller select control of thermal printer FIFO input memory buffer TPL Thermal printer latch print strobe control and data latch signal TPRES Thermal printer reset FIFO reset for thermal printer controller TPS 0 1 Therma...

Page 87: ...onnected or battery voltage when mains is not connected When mains is connected this supply charges the battery ULCD Contrast voltage to LCD US Input voltage for all PSUs on the power supply board from the rectified mains or from the battery VCC 5 V VMA Valid memory address VPA Valid peripheral address VSYNC Vertical synchronisation video VGA output WP0 and WP1 ECG in the serial multiplexed ECG se...

Page 88: ...SCHILLER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Page 8 8 Chapter 8 Glossary ...

Page 89: ...Page 1 Index SCHILLER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Index ...

Page 90: ...ponent Location ECG Amplifier 5 8 Configurations 7 3 Customer Services Sales Department 6 2 Service Department 6 2 D Default Settings 1 12 E ECG Amplifier Adjustments 5 8 ECG Amplifier Reference Voltage 5 8 ECG Isolated Power Supplies 2 5 ECG Signal 2 5 Electrode DC Offset 5 10 Exploded View Base 4 6 Exploded View Paper Feed 4 7 F Fault Diagnosis Chart 3 3 Filter 1 14 Functional Overview 2 2 G Gen...

Page 91: ...and Print Head Tension 3 5 Printer check 3 5 Printer Removal Replacement 4 10 Printer Timing 2 4 Program Memory 2 4 Proprietary Test Equipment tools 5 4 PWM Ramp Time Adjustment 5 8 R Reference 2V 2V Adjustment 5 8 Removal and replacement 4 11 S Serial EEPROM 2 4 Service and Sales iv Service Printout 5 9 5 10 Settings 1 10 Software Ugrades Options 5 11 Spare Parts 6 3 Stepper Motor Controller 2 5 ...

Page 92: ...Page 4 SCHILLER AT 2 6 Channel ECG Unit SERVICE HANDBOOK Issue 2 1 November 1998 Index ...

Page 93: ... PART C SHEET 10 SHEET 11 SHEET 12 SHEET 14 SHEET 13 SHEET 15 SHEET 9 SHEET 16 C2 C3 C4 C5 C6 LA RA RA F LA F C6 F C5 F C4 F C3 F C2 F C1 C1 F C1OS C2OS C3OS C4OS C5OS C6OS LAOS RAOS EBI0 EBI1 EBI2 EBI9 EBI3 EBI4 EBI16 EBI13 EBI15 EBI14 EBI11 EBI10 EBI8 EBI5 EBI6 EBI7 EBI12 PMPON RA1 RA1 LL RL N RA C4 C3 C2 LA LL C5 C1 C6 RL N EBI 0 16 CAVEi CAVEi CAVEi 14 6 13 5 12 4 11 3 10 2 9 1 7 15 8 16 17 P1...

Page 94: ...7 L1 22UH C1 47N C2 47N C3 10U 35V C4 47N C5 1U 16V C6 47N C7 47N C8 1U 16V C9 47N C10 47N C11 10N C12 47N C14 100N 13 12 1 U2F 74HC14 11 10 1 U2E 74HC14 C15 1U X7R Q5 RFD15P05SM TP4 TP5 TP6 TP7 D13 SGL41 4 5 U3B TSC426 2 7 6 3 U3A TSC426 C17 220U 35V C18 220U 35V C19 1000U 35V C20 220U 35V R2 100K R3 24K R4 1K R5 4K7 R6 24K R7 10K R8 100K R9 0R39 VR1 VR100K R10 1K R11 10R R12 47R R13 6K2 9 8 1 U2...

Page 95: ...48 MMBD914 D49 MMBD914 D50 MMBD914 TP54 D51 MMBD914 TP55 11 12 13 U33D 4093 10 8 9 U33C 4093 R206 10M 1206 3 2 1 8 4 U34A LM358 5 6 7 U34B LM358 Q36 BC847 C154 10N C155 10N C156 47N C157 47N C158 100N C159 10N C160 120P C161 10U 16V C162 10U 16V C163 47N C164 10N 4 5 6 U33B 4093 D53 MMBD914 TP56 TP57 TP58 TP59 TP60 TP61 Q37 BSP171 R207 10K R208 100K R209 100K R210 10K R211 10K R212 100K R213 100K ...

Page 96: ... BC847 D41 BZX84C15 C240 47N R328 1K8 R329 1K8 R330 1K8 R331 1K8 C140 1N5 5 2V 1A Last f 90kHz C146 2 x 10000U 25V 1 2 3 4 5 6 7 8 U18 SI9435DY D35 SGL41 GND 1 2 3 4 5 6 7 8 U24 SI9410DY D36 SGL41 C47 100N GND GND Q9 BC857 R86 47R R89 100R D27 MMBD914 5VREF R94 24K 1206 R91 1K R87 47R 2 7 6 3 U16A TSC426 4 5 U16B TSC426 GND R88 47R D28 MMBD914 R97 5K1 R98 5K1 Q10 BC857 TR 2 CV 5 Q 3 DIS 7 THR 6 R ...

Page 97: ...16V 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 P3 15 2D R256 NB 1206 C187 10N 3 4 1 U44B 74HC04 R258 10K R259 10K R260 10K R261 10K 1 2 14 7 1 U45A 74HC14 3 4 1 U45B 74HC14 5 6 1 U45C 74HC14 9 8 1 U45D 74HC14 11 10 1 U45E 74HC14 R267 100R R270 100R R271 100R C188 47N Q40 BC847 R277 100R R278 3R3 R110 100R R109 100R L8 4 7UH L9 4 7UH D56 MMBD914 R281 100R D57 M...

Page 98: ...3 TPUCH4 12 TPUCH5 11 TPUCH6 10 TPUCH8 6 TPUCH9 5 T2CLK 128 TPUCH10 4 TPUCH14 130 TPUCH15 129 EXTAL 62 XTAL 60 CLKOUT 66 XFC 64 VDDSYN 61 VSSI 59 GND 127 GND 117 GND 106 GND 101 GND 95 GND 83 GND 67 GND 51 GND 40 GND 34 GND 29 GND 17 GND 8 GND 2 TPUCH0 16 TPUCH7 9 TPUCH12 132 TPUCH13 131 TPUCH11 3 VSTBY 19 U46 68332FP VL 14 VS 11 GND 5 GND 6 GND 7 GND 8 GND 18 GND 17 GND 19 GND 20 I10 1 I11 2 PHAS...

Page 99: ... U62A 74VHC393 11 10 9 8 12 13 0 3 CTRDI V16 T C CT 0 U62B 74VHC393 11 10 9 8 12 13 0 3 CTRDI V16 T C CT 0 U63B 74VHC393 VCC VCC GND GND 1 11 2 3 4 5 6 7 8 9 12 13 14 15 16 17 18 19 20 10 E N 1 D C 1 U64 74VHC574 1 11 2 3 4 5 6 7 8 9 12 13 14 15 16 17 18 19 20 10 E N 1 D C 1 U65 74VHC574 VCC VCC GND GND D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 D 0 15 D 0 15 VCC GND 4 3 2 1 6 5 14 7 S ...

Page 100: ...2 A1 11 A2 10 A3 9 A4 8 A5 7 A6 6 A7 5 A8 27 A9 26 A10 23 A11 25 A12 4 A13 28 A14 3 A15 31 A16 2 CE 22 OE 24 CE2 30 R W 29 O0 13 O1 14 O2 15 O3 17 O4 18 O5 19 O6 20 O7 21 N C 1 VCC 32 GND 16 U37 628128 A0 21 A1 22 A2 23 A3 24 A4 25 A5 26 A6 27 A7 28 A8 29 A9 31 A10 32 A11 33 A12 34 A13 35 A14 36 A15 37 N C 38 CE 2 OE 20 VPP 1 PGM 39 O0 19 O1 18 O2 17 O3 16 O4 15 O5 14 O6 13 O7 12 O8 10 O9 9 O10 8 ...

Page 101: ...900 1 2 5 4 6 U9 PC900 1 2 5 4 6 U10 PC900 1 2 5 4 6 U11 PC900 1 2 5 4 6 U12 PC900 R50 15K R54 30K R55 22K R56 22K R57 22K Q7 BC857 R58 1K D18 MMBD914 D19 MMBD914 R59 24K D20 LM385 2 5V R60 1K R61 1K1 C50 680P C51 10U 16V R62 1K1 R63 1K1 C52 1N5 COG Q8 SST270 TP16 TP17 TP18 TP19 TP21 TP22 TP23 TP24 9 15 1 2 3 6 10 11 12 13 5 4 14 7 8 16 G 1 1 1 MUX U19 14551 C54 100N R64 15K TP25 R65 1K1 R66 1K1 3...

Page 102: ... 1 R39 39K 0 1 C33 100N 5 6 7 U5B TL062 3 2 1 8 4 U5A TL062 RV12 82V 5 6 7 U6B LPC662 3 2 1 8 4 U6A LPC662 C34 390P R283 220K C35 680P R41 3K9 0 1 C36 100N C37 1U 16V C38 1U 16V TP12 TPC TP13 TPC TP14 TPC TP15 TPC C39 680P COG D17 BAV99 R42 3M3 C40 1N5 R44 4K7 VR2 VR5K R45 24K R46 10K R47 10K R48 10K R49 10K TP76 TPC C202 1U X7R RV13 82V C41 3N9 R40 1K1 AGNDi R43 30K C46 1N R379 10R R380 100R C152...

Page 103: ... R146 39K 0 1 Q11 SST204 TP37 R148 10K R149 10K C92 390P C94 680P COG R152 1G D44 BAV99 C96 1U 16V AGNDi R154 1M 5VAi 5VAi 5VAi 5VAIF C2 S2 K C2 F C2OS CAVEi CAVEi AGNDi AGNDi AGNDi AGNDi AGNDi AGNDi AGNDi R127 30K R129 15K C88 150N 1206 R132 7M5 R133 7M5 R135 2K R137 160R C91 3N9 R139 47K R142 1K1 C89 150N 1206 RV4 82V R143 1K1 R145 3K9 0 1 R147 39K 0 1 Q12 SST204 TP36 R150 10K R151 10K C93 390P ...

Page 104: ...V7 82V R171 1K1 R174 3K9 0 1 R176 39K 0 1 Q13 SST204 TP39 R178 10K R179 10K C111 390P C113 680P COG R182 1G 5VAIF C4 S2 K C4 F C4OS CAVEi CAVEi AGNDi AGNDi AGNDi AGNDi AGNDi AGNDi AGNDi R156 30K R158 15K C107 150N 1206 R161 7M5 R162 7M5 R164 2K R166 160R C110 3N9 R168 47K R172 1K1 C108 150N 1206 RV8 82V R173 1K1 R175 3K9 0 1 R177 39K 0 1 Q14 SST204 TP38 R180 10K R181 10K C112 390P C114 680P COG R1...

Page 105: ...4 82V R301 1K1 R306 3K9 0 1 R312 39K 0 1 Q15 SST204 TP41 R319 10K R343 10K C121 390P C123 680P COG R346 1G 5VAIF C6 S2 K C6 F C6OS CAVEi CAVEi AGNDi AGNDi AGNDi AGNDi AGNDi AGNDi AGNDi R192 30K R195 15K C117 150N 1206 R199 7M5 R200 7M5 R202 2K R288 160R C120 3N9 R299 47K R302 1K1 C118 150N 1206 RV15 82V R303 1K1 R311 3K9 0 1 R318 39K 0 1 Q16 SST204 TP40 R344 10K R345 10K C122 390P C124 680P COG R3...

Page 106: ...82V R365 1K1 R368 3K9 0 1 R370 39K 0 1 Q17 SST204 TP43 R372 10K R373 10K C138 390P C142 680P COG R376 1G 5VAIF RA S2 K RA F RAOS CAVEi CAVEi AGNDi AGNDi AGNDi AGNDi AGNDi AGNDi AGNDi R349 30K R351 15K C127 150N 1206 R354 7M5 R355 7M5 R357 2K R359 160R C135 3N9 R363 47K R366 1K1 C133 150N 1206 RV19 82V R367 1K1 R369 3K9 0 1 R371 39K 0 1 Q18 SST204 TP42 R374 10K R375 10K C139 390P C144 680P COG R377...

Page 107: ...i 5VAi AGNDi AGNDi AGNDi AGNDi AGNDi AGNDi 5VAi AGNDi AGNDi AGNDi C26 10N R22 10K R23 10K R24 100K C27 100N R25 10K R26 10K TP10 TPC TP11 TPC R27 1M R28 10K C28 100N R29 10K D14 BAV99 R30 10K R31 470R D15 MMBD914 10 9 8 U4C TL084 5 6 7 U4B TL084 12 13 14 U4D TL084 3 2 1 4 11 U4A TL084 R32 1K C29 680P R33 220K C30 22P C31 22P R34 150K C32 4N7 C247 4N7 AGNDi ...

Page 108: ...V 5VDi 5VDi 5VAi 5VD 5VAi 10Vi TP26 C58 47N C59 47N C60 47N C62 47N TP27 TP28 C63 33U 16V C64 33U 16V D22 SGL41 C65 100N C66 47N C67 47N C68 47N C69 10U 16V C70 47N D23 SGL41 D24 SGL41 C71 47N C72 47N TP29 TP30 TP31 R76 3R3 R77 3R3 R78 10R R79 47R R80 10R R81 47R TP32 TP33 TP34 TP35 C73 10U 16V FS 3 SD 4 D1 1 D2 8 VCC 6 GND1 2 GND2 7 U23 MAX253 C74 47N D25 SGL41 C75 10U 16V C76 10U 16V D26 BAV99 C...

Page 109: ... GND CAVE GND GND GND GND GND GND GND 1 2 3 P2 3 1 TP65 R236 1K 13 12 1 U44F 74HC04 C189 390P C190 390P R237 NB R0805 R238 100R C231 4N7 D60 BAV99 R272 270R R273 1K C232 120P R275 10K C191 4N7 R274 1M Q41 BC847 1 2 14 7 1 U44A 74HC04 R338 1M Q44 BC857 R337 10K C243 10U 16V 1 2 P8 NB DUBOX 2 GND R342 1R C246 1U 16V MINH 11 10 1 U44E 74HC04 GND 3 2 1 8 4 U43A LMC6762 GND TP85 TP86 TP66 ...

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