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SCHILLER AT-2plus 6-Channel ECG Unit

SERVICE HANDBOOK Issue d May 2002

Chapter 2
Functional Overview

Introduction

This chapter provides a functional overview of the AT-2plus 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.

The AT-2

plus Memory

has the following new features compared to the standard version :

•

New CPU, 68332

•

FLASH EPROM (electrically erasable) 4 Megabytes

•

Interface connection

- RS-232 serial interface

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Summary of Contents for AT-2plus

Page 1: ...i SCHILLER AT 2plus 6 Channel ECG Unit AT 2plus 6 Channel ECG unit SCHILLER AG Altgasse 68 CH 6341 Baar Switzerland Phone 41 41 766 42 42 Fax 41 41 761 08 80 Homepage http www schiller ch ...

Page 2: ...ms 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 2plus Memory with the main physical attri...

Page 3: ...ification of the AT 2plus Memory is given in this chapter Chapter 8 Glossary This chapter explains all the acronyms and signal titles used in this book and in the AT 2plus Memory circuit diagrams Circuit Diagrams Board layouts The circuit diagrams and component layouts are provided for all boards These details are provided for information only ...

Page 4: ...reen 1 6 AT 2plus Short Form Operating Instructions 1 7 Modes of Operation 1 8 Automatic Mode 1 9 Manual Mode 1 10 Settings 1 12 Automatic Mode ECG Settings 1 20 Memory and Data Transmission Option 1 24 Erasing Memory Files 1 25 Transmitting Stored Files 1 25 Transmission Settings 1 25 Modem Transmission 1 26 Line Transmission 1 27 Software Updating via RS 232 1 28 Care Maintenance 1 29 Replacing ...

Page 5: ...s 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 printouts on one battery charge Large clear LCD for ECG preview prior to printing Simple one key operation for main functions Automatic or manual recording modes Selectable printing formats ...

Page 6: ...ns symbol is displayed as shown above When the unit is running on battery power a battery symbol is displayed 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 ...

Page 7: ...Page 1 4 SCHILLER AT 2plus 6 Channel ECG Unit SERVICE HANDBOOK Issue d May 2002 Chapter 1 Operating Elements The Keyboard ...

Page 8: ...t The sensitivity is 5 10 or 20 mm mV 7 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 8 The top character QRS toggles...

Page 9: ...mited the battery symbol flashes Bottom line ALT in this box indicates that the ALT key has been pressed 4 Electrode connections when a lead flashes it indicates that the electrode resistance is too high The electrode must be reapplied 5 Lead indication leads currently displayed on the screen Change the lead group with the keys 1 and 2 6 Myogram Filter indication Filter filter ON no indication fil...

Page 10: ...int Press COPY for additional copies AT 2plus 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 1 and 2 Press STOP to stop the printout Electrode hook up check Press ALT 0 1mV 3 AUTO 3 AUTO for electrode check Best results are obtained when the electrode voltage readings right column are b...

Page 11: ...ing 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 Automatic Mode Manual Mode Manual Mode provides a real time printout of 6 leads that are selected and indicated on the screen The following can be freely sel...

Page 12: ...t Auto sensitivity is set 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 ALT 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 ...

Page 13: ... LEAD BACKWARD key 1 2 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 Note The LCD only displays three leads at one time When the lead forward or lead backward key is pressed the following preceding three lead group is displayed Leads For software versions higher than 4 10 it is also possible to cho...

Page 14: ...ey is pressed the same speed is set on both the screen and the manual printout When 5 or 10 mm s is selected this affects the manual printout speed only Sensitivity Select 5 10 or 20 mm mV by means of the SENSITIVITY keys 4 5 5 10 6 20 Myogram Filter Switch the filter ON or OFF with the FILTER key FILTER is displayed on the bottom line of the LCD when the filter is switched on Recentering To re ce...

Page 15: ...evious page Note The Alternative ALT 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...

Page 16: ...stalled C Interpretation and interpretation version Serial number Serial number of the unit 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 Automat...

Page 17: ... AS SET AS SET LEADS STANDARD S STANDARD S AUTO FORMAT 1 ECG 25MM S SHORT O ECG 25MM S SHORT O MECG 2 6 50MM S 1 MEASUREMENTS SUPRESSED INTERPRETATION ENABLED MARKS ENABLED AUTO FORMAT 2 ECG 25MM S LONG OOO ECG 25MM S LONG OOO MECG NONE MEASUREMENTS SUPRESSED INTERPRETATION DISABLED MARKS ENABLED RHYTHM LEADS V1 V1 II AUTOM CENTERING ENABLED ENABLED PRINTOUT OF SIGNALS SEQUENTIAL SEQUENTIAL BASELI...

Page 18: ...th the SWUP program User Identification The user identification is printed on all recordings The user ID can be the department doctor or hospital etc Enter the user ID as follows Press the ALT key followed by key 9 3 3 ALT 9 3 3 The user entry field is displayed on the LCD Enter up to 30 characters via the keyboard Confirm the new user ID by pressing the ENTER key ...

Page 19: ...onfirm 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 to suppress ...

Page 20: ...ey 3 Myogram Filter 35 Hz 1 Myogram Filter active when the unit is first switched on marked on printout with 8 Myogram Filter off when the unit is first switched on marked on printout with 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...

Page 21: ... 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 overlap The Standard and Cabrera lead groups ...

Page 22: ...RS beep can be switched on or off at any time by pressing the QRS key QRS Time Date The required settings can be selected as follows Setting the Time and Date Key Sequence Enter Data Confirmation Time ALT 9 1 1 HHMMSS beep Date ALT 9 2 2 DDMMYY beep Seasonal Time Variation Key Sequence Wintertime to Summertime 1Hr ALT 9 4 4 Summertime to Wintertime 1Hr ALT 9 5 5 ...

Page 23: ...nce Setup Format ALT 1 Commence Setup for Auto format 1 2 Commence Setup for Auto format 2 The automatic mode formats are detailed on the following pages The ECG format is set as follows ECG Format Entry Key Sequence Printout Confirm ALT 1 or 2 1 1 1page x 12 leads at 25mm s Press STOP key 2 One page with the first 8 leads printed for 5s and the last 4 leads printed for 10s 5 No leads printed 6 Le...

Page 24: ...hm leads 25mm s The average complexes are printed in 4 groups of three leads at a chart speed of 50mm s 8 2 x 6 50 mm s 2 rhythm leads 25mm s The average complexes are printed in 2 groups of six leads at a chart speed of 50mm s Measurements and Markings C version only To define the measurements and markings proceed as follows Measurements Interpretation Option Only Entry Key Sequence Printout Conf...

Page 25: ...ttings 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 Low sensitivity will suppress certain nonspecific ECG diagnosis this may be advisable when carrying out ECGs for screen...

Page 26: ...lowing formats can be set Rhythm Leads interpretation option only Entry Key Sequence Setup Format ALT 3 Define Rhythm lead one 4 Define Rhythm lead two The 2 rhythm leads are defined as follows Extremity Leads Entry Key Sequence Lead Confirm ALT 3 or 4 8 1 I Press STOP key 2 II 3 III 4 aVR 5 aVL 6 aVF Precordial Leads Entry Key Sequence Lead Confirm ALT 3 or 4 9 1 V1 Press STOP key 2 V2 3 V3 4 V4 ...

Page 27: ...ransmitted before further recordings can be stored A number of memory settings can be made as follows Note At the time of print it is not possible to read or to delete individual stored recordings Auto Storage and Auto Erase Memory Setup Entry Key Sequence Save Mode ALT 0 5 0 Auto save off 1 Auto save on 2 Auto erase off 3 Auto erase on With auto save on all auto mode recordings will be automatica...

Page 28: ...ectly using the RS 232 connector of the computer or over the telephone system Sending directly is termed LINE transmission sending over the telephone system requires a modem and this form of sending is termed MODEM Transmission Settings The speed settings options for the AT 2plus are as follows Serial Communication Interface Entry Key Sequence Transmission Speed ALT 0 9 1 0 115200 1 57600 2 38400 ...

Page 29: ...0 modem sends response V0 numerical response codes E0 no command echo The standard modem initialisation code is ATB0L1V0Q0E0S0 0 Press the patient key to store settings Connect the modem cable assembly supplied with modem between the RS 232 connector on the AT 2plus and the modem Ensure that the SEMA communication program SEMACOMM is active on the computer see SEMA handbook Enter the memory menue ...

Page 30: ...mmunication program SEMACOMM is active on the computer see SEMA handbook Enter the Memory menue by pressing the ALT key followed by the key M ALT M Press and hold the ALT key and then press T ALT T The message TRANSMITTING appears while the unit is sending in the message box under the date and time box If a transmission error occurs the message Tx ERROR is displayed Check all settings in the SEMAC...

Page 31: ...ree COM port on your PC 2 Switch the PC ON and go to Win 95 3 Install the SWUP programme by using Install exe on diskette No 1 4 Follow the instructions given by the programme 5 Access the programme through the icon SWUP Schiller Menu 6 Go to the configuration menu and chose the applicable COM port 1 or 2 7 Set the Baudrate to Auto 8 Make sure that the AT 2plus is switched ON 9 Chose Start 0 Start...

Page 32: ... The unit should undergo a technical safety check every 12 months This safety check should include the following Visual inspection of the unit and cables Electrical safety tests according to IEC 601 1 and IEC 601 2 25 Functional tests according to the Service Handbook The test results must be documented Cleaning the Casing CAUTION SWITCH THE UNIT OFF BEFORE CLEANING AND DISCONNECT THE MAINS DO NOT...

Page 33: ...t trolleys The cable can be wiped with soapy water Sterilization if required should be done with gas only and not with steam To disinfect wipe the cable with hospital standard disinfectant Cleaning the Thermal Print Head If the printer is used a lot a residue of printers ink from the grid on the paper can build up on the print head This can cause the print quality to deteriorate We recommend there...

Page 34: ...s follows Use both hands and place fingers under the retaining bar 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 beginning of the paper over the b...

Page 35: ...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 36: ...0 Main Board 2 4 Power Supply 2 4 Program and ECG Memory 2 4 Serial EEPROM 2 4 Thermal Print Head Controller 2 4 Printer Timing 2 4 Paper Mark 2 4 Power On Reset 2 5 Stepper Motor Controller 2 5 ECG Isolated Power Supplies 2 5 ECG Signal 2 5 Noise Damping 2 5 MK 14 11 RS 232 Interface Board 2 6 External Modem 2 6 Top Assembly 2 7 LCD Screen 2 7 Alphanumerical Keyboard 2 7 ...

Page 37: ... 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 The AT 2plus Memory has the following new features compared to the standard version New CPU 68332 FLASH EPROM electrically erasable 4 Megabytes Interface connection RS 232 serial interface ...

Page 38: ...al multi plexer PWM AC DC converter Input amplifier and filter DC AC converter 400 kHz 5Vi 2Vi 5Vi 5Vi 10Vi 5 2Vi 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 Rectificatio...

Page 39: ... 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 Program and ECG Memory A FLASH EPROM electrically erasable with a capacity of 4 MByte 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 s...

Page 40: ...ies 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 signals RA LA and C1 to C6 are low pass filtered approximately 10kHz and applied to non in...

Page 41: ...4 10 main board The communications controller contains a USART and interface circuit which performs the parallell serial and serial parallell 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 2plus and be used for transmitting memory contents over a tel...

Page 42: ...he LCD backlight and the contrast voltage The ECG signals are 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 ...

Page 43: ...Page 2 8 SCHILLER AT 2plus 6 Channel ECG Unit SERVICE HANDBOOK Issue d May 2002 Chapter 2 Functional Overview ...

Page 44: ...el ECG Unit SERVICE HANDBOOK Issue d May 2002 Chapter 3 Fault Diagnosis Contents Introduction 3 2 General Check Procedures 3 3 Printer Check 3 4 Print Head Alignment and Print Head Tension 3 4 RS 232 Test with Test Plug 3 5 Memory and Data Transmission Check 3 6 ...

Page 45: ...gral part of the top assembly Printer assembly 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 modu...

Page 46: ...oard 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 Connect an ECG simulator to the ECG connector on the side pane...

Page 47: ...R 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 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 spring exerting pressure on the print head the print head tension cannot be adjusted Simila...

Page 48: ...d from a standard 9 pin D type connector female Shortcircuit the following pins pins 2 and 3 receive transmit pins 7 and 8 RTS CTS pins 6 and 4 DSR DTR ready 1 Connect the RS 232 test plug part number to be assigned to the RS 232 port on the side of the unit 2 Switch the unit ON 3 Select communication test by entering ALT 0 3 7 4 Press the key R receive No output on the screen 5 Press the key T A ...

Page 49: ...ct YES and press ENTER ERASING flashing Set Auto save ON ALT 0 5 1 Set Auto erase ON ALT 0 5 3 Enter patient data Press data ECG button Patient data Start AUTO mode ECG Press AUTO button ECG Check Memory files ALT M New file in memory Connect RS 232 cable between AT 2plus and PC Check settings SEMA Config Baud n 2 100 ms Set baud rate AT 2plus ALT 0 9 x see Page 1 25 Confirm baud rate setting Pres...

Page 50: ...ase 4 8 Printer Tray Assembly and Thermal printer 4 10 Printer Paper tray Assembly Removal 4 10 Thermal Printer Removal 4 10 Thermal Printer Replacement 4 11 Printer Paper tray Assembly Replacement 4 11 Main Board MK 14 10 4 12 Board Removal 4 12 Board Replacement 4 12 Battery Pack 4 13 Battery Pack Removal 4 13 Battery Pack Replacement 4 13 Keyboard 4 14 LCD screen board 4 15 LCD board Removal 4 ...

Page 51: ...apter 4 Module Removal and Replacement Remove top assembly Paper tray assembly and motor Board MK 14 10 Mains trans former and connector Battery pack Thermal printer RS 232 Interface Remove top assembly Keyboard LCD screen assembly In Base assembly access to In Top assembly access to ...

Page 52: ...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 Warni...

Page 53: ...N 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 ...

Page 54: ...ers in the base assembly The battery is secured in position in 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...

Page 55: ...Page 4 6 SCHILLER AT 2plus 6 Channel ECG Unit SERVICE HANDBOOK Issue d May 2002 Chapter 4 Module Removal and Replacement Exploded View Base Assembly and Printer ...

Page 56: ...Page 4 7 Chapter 4 Module Removal and Replacement SCHILLER AT 2plus 6 Channel ECG Unit SERVICE HANDBOOK Issue d May 2002 Exploded View Paper Feed ...

Page 57: ...mbly 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 in the extreme corners and edges of the un...

Page 58: ... 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 assembl...

Page 59: ...e 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 14 10 data connector to the thermal printer paper mark connector printer motor connecter earth connector 2 Unscrew the six retaining screws and remove the complete paper tray printer assem...

Page 60: ...ng 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 Re...

Page 61: ...IS DISCONNECTED BEFORE COMMENCING 1 Disconnect the following connectors live and the neutral bayonet connectors to the mains connector battery connector connecting cable to RS 232 board MK 14 11 or Modem board 2 Unscrew the 12 spacer fixations four on the mains transformer and remove the board Board Replacement To replace the Main board MK 14 10 proceed as follows 1 Position the board and secure a...

Page 62: ...ceed 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 Program all static settings ...

Page 63: ...2plus 6 Channel ECG Unit SERVICE HANDBOOK Issue d May 2002 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 64: ...er Part Number The part number for the LCD screen board is given in Chapter 6 CAUTION THE LCD BOARD CONTENT IS STATIC SENSITIVE OBSERVE ANTISTATIC PRECAUTIONS LCD board Removal 1 Unscrew the four retaining screws securing the LCD board in position 2 Remove the board LCD board Replacement To replace the LCD board proceed as follows 1 Position the board and secure at the 4 fixing points 2 Connect th...

Page 65: ...nected Tools Cross bladed screwdriver Part Number The part number for the RS 232 board is given in Chapter 6 CAUTION THE RS 232 BOARD CONTENT IS STATIC SENSITIVE OBSERVE ANTISTATIC PRECAUTIONS RS 232 board Removal 1 Disconnect the 10 pole connector to the main board 2 Unscrew the four retaining screws securing the board in position 3 Remove the board RS 232 board Replacement To replace the RS 232 ...

Page 66: ...ard MK 14 10 Adjustment locations 5 5 Battery Charge Voltage 5 6 Precautions and Requirements 5 6 Tools and Equipment 5 6 Procedure 5 6 Paper mark Detector Check 5 7 Tools Equipment and Material 5 7 Procedure 5 7 ECG Amplifier 2V 2V and PWM Ramp Time Adjustment 5 8 Tools Equipment and Material 5 8 Procedure 5 8 ECG Amplifier reference voltage 5 9 Service Screen 5 10 Software Options Updates 5 12 I...

Page 67: ...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 2plus has the following adjustments Bat...

Page 68: ...N 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 2PLUS ARE SUSCEPTIBLE TO ABRASION DAMAGE TO PREVENT SCRATCHING ALWAYS PLACE ON A SOFT NON ABRASIVE CLOTH Conditions The unit mus...

Page 69: ...the AT 2plus 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 Simulator 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 l...

Page 70: ...r Printer data connector MK 14 10 Main board Power supply ECG assembly isolated Battery Microprocessor assembly RS 232 Serial Interface Keyboard connector Printer motor connector Patient connector RS 232 connector LCD backlight HV Not used VR2 VR3 VR1 LCD signals and power MK 14 11 Main Board MK 14 10 Adjustment locations Batt connectors ...

Page 71: ...UNIT ON 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 14 10 from the assembly and remove the EMC shield from the board Replace the board in position Rem...

Page 72: ...otor 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 throug...

Page 73: ...E SAME TIME Tools Equipment and Material Digital voltmeter Small flat bladed screwdriver Procedure DISCONNECT THE MAINS SUPPLY CAUTIONS THE AT 2PLUS CONTAINS STATIC SENSITIVE CMOS COMPONENTS OBSERVE ANTISTATIC PRECAUTIONS PLACE THE UNIT ON 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...

Page 74: ...s 1 and 7 of operational amplifier U5 Adjust trimmer VR2 to achieve a voltage difference of 4000 mV 2mV Obtain a printout of the test screen by pressing ALT 0 3 any number 0 6 P Ensure that the Uref and the Uref measurements are both 2000mV 20mV Ensure that the Udiff reading is 4000mV Adjust VR3 to achieve a Udif reading of 4000mV 20mV Reassemble the unit as detailed in Chapter 4 Re check the volt...

Page 75: ...ess the following key sequence ALT 0 3 any number 0 6 To obtain a printout press P 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 neg...

Page 76: ...lator 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 This is the measured ambient temperature that the processor uses to correct print quality This reading should be ambient temperature 5o EPROM This is the checksum for the EPROM Its value varies f...

Page 77: ... upgrade the AT 2 from standard to C version type the following ALT 0 4 update code obtainable from SCHILLER Acceptance of the code is indicated by a series of beeps CAUTION MORE THAN 10 ATTEMPTS TO ENTER THE INCORRECT CODE BLOCKS THE UNIT Installing Software Updates To update the operating software in the AT 2plus see instructions in Chapter 1 of this book ...

Page 78: ...Page 6 1 Chapter 6 Spare Parts SCHILLER AT 2plus 6 Channel ECG Unit SERVICE HANDBOOK Issue d May 2002 Chapter 6 Spare Parts Contents Ordering Information 6 2 Service Department 6 2 Spare Parts 6 3 ...

Page 79: ...HILLER 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 2plus 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 num...

Page 80: ...11 005 Paper tray complete with yoke and wheels 3 911 016 Paper tray with yoke but without wheels 3 911 011 Main EMC shield 4 416 041 ECG EMC shield 4 416 025 RS 232 interface EMC shield 4 416 055 Mains socket complete 4 270 009 Mains fuse holder 4 210 049 Mains fuse 200 mA T 4 210 010 Mains fuse 315 mA T 4 210 032 Mains transformer 4 320 066 12 V lead acid battery 4 350 005 023 Printer motor comp...

Page 81: ...Page 6 4 SCHILLER AT 2plus 6 Channel ECG Unit SERVICE HANDBOOK Issue d May 2002 Chapter 6 Spare Parts ...

Page 82: ...Page 7 1 Chapter 7 Technical Data SCHILLER AT 2plus 6 Channel ECG Unit SERVICE HANDBOOK Issue d May 2002 Chapter 7 Technical Data Contents Technical Data 7 2 Available Configurations 7 3 ...

Page 83: ... 40 dots per mm 1000 dots per inch time axis 25mm s Recording Tracks 6 channels positioned at optimal width on 200 mm automatic baseline adjustment Automatic Lead Programs Printout of all 12 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 markings and interpret...

Page 84: ...01 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 0123 This device is not designed for outdoor use IP 20 EnvironmentalConditions Temperature Operating 10O to 40O C Temperature Storage 10O to 50O C Relative humidity 25 to 95 no...

Page 85: ...Page 7 4 SCHILLER AT 2plus 6 Channel ECG Unit SERVICE HANDBOOK Issue d May 2002 Chapter 7 Technical Data ...

Page 86: ...SCHILLER AT 2plus 6 Channel ECG Unit SERVICE HANDBOOK Issue d May 2002 Page 8 1 Chapter 8 Glossary Chapter 8 Glossary Contents Introduction 8 2 Acronyms 8 3 ...

Page 87: ...ollowing 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 2plus Memory Only abbreviations that are specific to SCHILLER equipment are included here General electrical and electronic abbreviations are not included ...

Page 88: ...er 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 indicates...

Page 89: ...or 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 KB...

Page 90: ...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 o...

Page 91: ... 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 Thermal...

Page 92: ...nnected 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 ser...

Page 93: ...SCHILLER AT 2plus 6 Channel ECG Unit SERVICE HANDBOOK Issue d May 2002 Page 8 8 Chapter 8 Glossary ...

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