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- Frank`s Hospital Workshop

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2. Power Supply 1 Connect mains to the unit and switch on Ensure that the mains LED lights and the Battery LED lights Ensure that when the battery is fully charged maximum 15 hours the battery light is extinguished when mains is still connected 2 Switch the unit on and ensure that the LCD lights and that straight line traces are displayed for the selected leads 3 Press the PRINT SCREEN key and ensure that the print out is accurate and of good quality Note If the print out quality is poor and the printer has not been changed the stored printer resistance data may have been lost from memory To check the stored resistance setting see Paragraph 5 Self Test Screens and Offset Adjustments If problems are experienced with paper mark detection or setting the printer speed it may be necessary to adjust the factory pre sets on the Interface board 4 Press any key and ensure that the buzzer beeps 5 Check the 12V supplies and communications interface by carrying out the RS test procedure detailed in Paragraph 4 4 6 Disconnect the mains supply and ensure that the mains LED is extinguished and that the yellow battery LED lights If all these checks are satisfactory it indicates that the Power Supply board is functioning If any of the checks fail the individual power supplies must be checked Power Rail Adjustment Procedure The power supply voltages can be checked in isolation it is not a requirement tha
3. Thermal Printer Replacement The resistance value of the printer is used as an off set by the printer drive circuit and must be entered via the AT 10 menu structure prior to operation Before replacing the printer make a note of the printer resistance The resistance value is found written on a label on the printer To replace the Thermal Printer proceed as follows 1 Position the Printer and secure with the four corner retaining screws Ensure that the cable assemblies from the printer to the Interface PCB are not caught and are not strained 2 Reconnect the connectors to the Interface board Checks Tests and Adjustments after Printer Replacement Carry out the printer check as follows 1 Check that the correct resistance of the printer is entered in the AT 10 memory as follows Note The printer resistance will be found on a label attached to the printer Enter the following key sequence lt ECG gt 6 electrode test lt gt ENTER R TPH is the resistance of the printer To enter a new resistance value press lt gt The first figure of the resistance value is highlighted and the correct resistance value can be entered Note that the AT 10 will only accept a resistance range of between 1000 and 1800 Ohms 2 check the printer and to ensure that every pixel is operational enter the test screen and press P Enter the following key sequence lt ECG gt 6 electrode test lt P gt A pr
4. 1 sauva diov av31 we uoi1vino3u wowo anis gar WILNALOd lt INAYHNO 4340 e gt m uoilvinoau HOLOV Ir HO LIMS SNIHOLIMS YAMOd 3915499 SNVHL HOLOATAS 440 NO8 Lj H g NN Y EKTE Hol1v1no3u NOILYIOSI FOVLIOA pene pe ONIHOLIMS L 3Nn pron aa ve sNIVW SNIHOHINOW EE ES ES o uu NOM iNatsno Ast AGE ADVLION 9 8 quvog AlddNS 1 d R Y NO 1H Vd 0L 1V 50 a D um m m Glo SCHILLER AT 10 ECG and Spirometry Unit Chapter 2 SERVICE HANDBOOK Issue c April 2002 Functional Overview Power Supply Mains is applied to the line filter via the on off switch and two 200 mA slow blow fuses The line filter incorporates a temperature variable resistor to ensure that the current is limi
5. 1 Ssdudav Y SUUS 553015 1 5O1VNV viva HATIONLNOO DNUS js ovd ndo H31H3ANOO SNOILVOINDnINWOO SNOLLVOINQIWIWOO Gm oue WYH9OHd HalsviN av 1 quvog HOSS32OHdOHOIN o c cM ECKE TER ee YOLINOW 1 OL uya 39uvH9 I AllOvdvO AYALLVE l ant i ave A8L Az i u3iNHOJSNVH L HOLIMS SOVLIOA bp se 39OVLION ad NOILY 1OSI ONY uar S3riaans SNIVIN LINN gt 33O NO 9 8 MIN ATddNS L 993 Y 001 dS 2NIOd SNIVIN Page 2 6 SCHILLER AT 10 ECG and Spirometry Unit Chapter 2 SERVICE HANDBOOK Issue c April 2002 Functional Overview Overall Functional Description Power Supply Mains is applied to the power supply via a mains filter on off switch and a voltage selection switch The voltage selection switch connects the supply to the relevant winding of the mains isolation transformer The ac voltage is then rectified to produce a resultant dc voltage of approximately 27V This voltage is applied to regulator circuits which generate all of the dc power supplies required by the AT 10 electronics The power on off control circuit switches the supply voltage to the regulators The power on off is controlled by the following conditions Onsignal from th
6. 2 Select second function STORAGE Main menu for data archive and data recall from storage e Switches the unit on START Start automatic recording MS MAN Start manual recordin wy Switches the unit off START 9 OFF oon Stop printout move REPLACE Extend paper tray 7 Paper to start position PAPER Retract paper tray Note Slight functional differences may exist in different modes Page 1 6 SCHILLER AT 10 ECG and Spirometry Unit Chapter 1 SERVICE HANDBOOK Issue c April 2002 Operating Elements The Keyboard cont Function Keys The function keys are arranged in a group in the middle of the keyboard The left part of the group comprises keys for the resting ECG recording functions The middle part comprises keys for the Exercise ECG functions On the right hand side is the SPIRO key for the optional pulmonary function testing program The following is a summary of the keys and their functions Resting ECG Function Keys MONITOR MONITOR MONITOR lt mm s mm mV CHANNEL A PRINTER 1mV FILTER CHANNEL ECG Select resting ECG menu MONITOR Channel selection for CHANNEL display 3 6 or 8 LEAD D Lead selection forwards lt Signal centering LEAD Channel selection for 4 Lead selection backwards nee printout 3 4 5 or 6 or J user programmed MONITOR Selection of di
7. Keyboard Leads Automatic lead programs 320 x 264 x 74 mm approx 4 7 kg 110 130 220 240Vac 50 60Hz 13 to 30VA lead acid 2 x 12V high resolution thermal printhead 8 dots per mm amplitude axis 40 dots per mm time axis 9 25mm s 2 5 5 10 12 5 25 50 100 mm s 2 5 5 10 20mm mV 3 4 5 6 or 7 channels positioned at optimal width on 200 mm automatic baseline adjustment thermoreactive Z folded perforation for A5 format Backlighted liquid crystal display for ECG monitoring and alphanumeric information Resolution 480 x 640 dots viewing angle adjustable 0 Hz 150 Hz IEC 0 Hz 150 Hz AHA for testing of electrode cables for interruptions and short circuit control light indication fully floating and isolated defibrillation protected less than 5 pA CF according to IEC I according to IEC temperature operating 10 to 40 C temperature storage 0 to 50 C relative humidity 15 to 85 non condensing splashproof keys Standard Cabrera Frank X Y Z Nebb V7 V8 V9 further combinations can be programmed by the user 3 4 5 6 or 7 channel representation on one or two pages A4 25 50 100 mm s Versions M and C average complexes of the 12 standard leads 25 or 50 mm s and 10s rhythm strip 1 or 3 leads Vector loops from the standard leads SCHILLER AT 10 ECG and Spirometry Unit SERVICE HA
8. Offset Settings Test Screen This provides measurements and setting facilities for the analog offsets used for accurate control of exercise bikes and analog controlled treadmills This screen also contains the thermal print head resistance setting option Electrode Test Screen Use this screen to display the dc voltage between the left leg electrode and all other electrodes The measurements obtained will indicate any cable short circuits or open circuits To enter the electrode test screen proceed as follows 1 Press lt ECG gt to display the main menu options 2 Select option Electrode Test to enter the electrode test screen The following display will be shown EI lt mV gt RA 0 LA 3 C V1 0 C V2 0 C V3 3 C V4 3 C V5 0 C V6 0 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 30 mV this will depend on the patient simulator used and must be taken as a flexible measurement With all electrodes shorted together 20 mV Patient lead not connected ie open circuit 50 mV Note The readings obtained with this screen are necessarily arbitrary Generally when the readings for all electrodes are the same or vary by only a small percentage it can be assumed that the patient cable and electrodes are within tolerances Page 5 16 SCHILLER AT
9. 3 Fully charge the battery by leaving the unit connected to the mains for 15 hours Run the unit on battery power until the battery is fully discharged and the unit switches off Repeat this process two times The value of the battery capacity calculated and stored by the processor can be seen by pressing lt ECG gt 6 electrode test ENTER ENTER The B CAPACITY indication displays the calculated battery capacity See Chapter 5 for further details Program all static settings SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement Program Pack and Software Modules Pre requisites Tools e Cross Bladed screwdriver e Special chip removal tool type AMP Parts Program Pack with the correct software installed or the software EEPROM or DSP modules Part numbers as detailed in Chapter 6 CHIP ALIGNMENT NOTCH DSP UPPER UE LOWER LE CHIP EEPROM EEPROM Note The EEPROM software is available in various languages indicated by the label on the EEPROM The second letter in brackets indicates the language as follows E English D German S Swedish I Italian F French P Spanish Page 4 29 Chapter 4 SCHILLER AT 10 ECG and Spirometry Unit Physical Overview amp Module Replacement SERVICE HANDBOOK Issue c April 2002 Program Pack and Software Modules cont Program Pack and program EEPRO
10. Secured in the Main Housing is the LCD Keyboard Buffer MK8 4 and the Keyboard MK 8 3 Both of these boards are secured with double sided tape Electrical connection between the modules is achieved with ribbon cable assemblies or with flying leads Page 4 9 Chapter 4 SCHILLER AT 10 ECG and Spirometry Unit Physical Overview amp Module Replacement SERVICE HANDBOOK Issue c April 2002 IN BASE ASSEMBLY ACCESS TO IN TOP ASSEMBLY ACCESS TO Note Access to the Program Pack is gained via the left hand Side Panel under the paper tray Access to the mains fuse and the voltage selector is from the back panel Mains Module Page 4 10 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement Removal and Replacement Introduction This Chapter provides the procedures required to carry out the removal and replacement of all modules that are spared at service level The instructions given in this chapter are autonomous with each module containing the following The pre requisites that must be fulfilled before removal 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 e Replacement Procedures Checks and Tests that must be carried out after replacement Any adjustments jumper settings special checks
11. 1 Operating Elements SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 User programmable Lead Group The user programmable group comprises 12 leads which can be individually programmed To program these leads press the lt ECG gt key select the ECG Settings menu option and then select Programmable Leads 5 The following table is then displayed PROGRAMMABLE LEADS Lead 1 1 Il Lead 2 2 aVF Lead 3 3 III Lead 4 4 V2 Lead 5 5 V5 Lead 6 6 V6 C Save settings Lead 7 7 Lead 8 8 Lead 9 9 Lead 10 0 Lead 11 A Lead 12 B aVR aVL aVF V2 V4 V6 The display shows the leads currently programmed The numbers 1 to 12 symbolise the order of the leads and the actual lead identifications show which lead is in which position in the group To program your own lead group simply enter the code number of the lead you require and press it several times to select the lead that you want As an example to select lead V1 as the first lead press key 1 several times until lead V1 is displayed All leads can be programmed in this way Page 1 20 SCHILLER AT 10 ECG and Spirometry Unit Chapter 1 SERVICE HANDBOOK Issue c April 2002 Operating Elements Programmable channels for Printout The number of channels for the printout can be set to either 3 4 5 7 6 or a user defined number To set this user defined number press the lt ECG gt key selec
12. 10 ECG and Spirometry Unit Chapter 5 SERVICE HANDBOOK Issue c April 2002 Functional Checks amp Adjustments Self Test Screen To enter the self test screen proceed as follows 1 When in the Electrode test screen press ENTER The following display will be shown Selftest Uref 0 Uref 0 Udif 0 Calib 0 CMSIG 0 T TPH 23 SYNC 0 SUBSYN 15 SKIP 8 This screen gives the following data Uref This is the value of the reference voltage used in the multiplexer circuit on the ECG Amplifier The value of the reference voltage is 2727 mV However because the ECG amplifier has a floating ground this figure is arbitrary and the measured voltage can give a great variance to the true value Uref This is a negative reference voltage used on the ECG Amplifier board Because the ECG amplifier has a floating ground this figure is arbitrary Udif This is the difference of the two reference values above Uref and Uref Calib This is the value of a signal generated by the CPU for calibration of the ECG signals CMSIG This measurement gives an indication of the common mode noise A high reading indicates high common mode noise and thus the quality of the ECG reading may not be as good as with a lower noise level The measurement indicates the amplitude of the output signal of the right leg driver circuit Page 5 17 Chapter 5 SCHILLER AT 10 ECG and Spirometry Unit Functional Checks amp Adjus
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14. 9 Locate the end of the inner tube into the end of the outer tube and push it gently but firmly until the shoulder of the inner tube makes contact on the outside edge of the outer tube The two red location marks must be in line 10 Fit the rubber adapter by placing its wider end over the end of the inner tube with the red location mark 11 Insert a new mouthpiece max 1 5cm into the end of the rubber adapter Page 5 24 SCHILLER AT 10 ECG and Spirometry Unit Chapter 6 SERVICE HANDBOOK Issue c April 2002 Spare Parts Chapter 6 Spare Parts Contents Introduction 6 2 Module Identification 6 3 AT 10 Spare Modules 6 5 Disposables 6 6 Accessories 6 7 Dedicated Test Equipment and special Tools 6 8 Page 6 1 Chapter 6 SCHILLER AT 10 ECG and Spirometry Unit Spare Parts SERVICE HANDBOOK Issue c April 2002 Introduction This Chapter gives the part numbers for modules that can be replaced by the service engineer The part numbers for disposables accessories and dedicated test equipment are also included When ordering state that the module required is for an AT 10 unit and provide the following Part Title Part Number Software Version Serial number of the unit Your company address and a contact name The software version and the serial number of the unit are found on the software screen details in Chapter 4 The serial number is especially necessary when ordering mechanical parts to ensure that
15. FET is controlled by an operational amp and transistor circuit so that it acts as a variable resistor to stabilise and produce 5 supply Servicing 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 C9 are 41kHz low pass filtered and applied to non inverting operational amps giving a gain of 11 The signals are further low pass filtered 1 6kHz and amplified by 3 before being applied to the multiplexer The multiplexer enable signal is 4kHz with the output duration of each sampled lead approximately 20 microseconds 4 kHz ALL LEADS SAMPLED EACH APPROX 20 MICROSECONDS The multiplexed ECG signal is base line compensated The base line compensation is set by the ECG processor and converted to an analog signal by a DAC U20 The maximum compensation is 300 mV A gain control is also incorporated for the multiplexed ECG signal and set by the processor This gain is selectable to 2 5 5 or 10 The signal is then passed to a summing circuit where the last sample value from the D A converter U21 is subtracted from the present sample value The resultant is the difference of the actual sample and the previous sample The resulting voltage is analog to digital converted by the ECG processor and output to the CPU via a multiplexer and GAL circuit U23 U26 and opto isolators Page 2 20 SCHILLER AT 10 ECG and Spirometry Unit Chapter
16. MK 8 3 ITALIAN 3 2235FA ECG BOARD MK 7 2 3 2181 MICROPROCESSOR BOARD MK 8 1D 3 2230DB MICROPROCESSOR BOARD MK 8 1 WITH LAN 3 2228 PROGRAM PACK MK 8 11C 3 2242CA CONNECTORS RS 232 422 MK 8 7C 3 2239CB POWER SUPPLY BOARD MK 8 6E 3 2238EF INTERFACE BOARD MK 8 5E 3 2237EA LCD KEYBOARD BUFFER MK 8 4C 3 2236CB PAPER TRAY DC MOTOR COMPLETE 3 910 610 THERMAL PRINT HEAD 4 140 113 THERMAL PRINTER MOTOR 3 910 609 LCD 640 X 480 4 600 051 LEAD ACID BATTERY 4 350 020 MAINS MODULE COMPLETE 4 270 004 MAINS TRANSFORMER 4 320 085 Page 6 5 Chapter 6 Spare Parts SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 Disposables Page 6 6 DESCRIPTION M IM PRINTER PAPER 2 157 012 DISPOSABLE CARDBOARD MOUTHPIECES 2 100 024 FOR PNEUMOTACHO SENSOR SP 100 ELECTRODE GEL 100 mL 2 158 005 SCHILLER AT 10 ECG and Spirometry Unit Chapter 6 SERVICE HANDBOOK Issue c April 2002 Spare Parts Accessories PART DESCRIPTION NUMBER GROUND CABLE 2 310005 POWER CABLE 2 300005 ELECTRODE SET COMPRISING FOUR EXTREMITY STAINLESS STEEL ELECTRODES WITH RUBBER STRAPS SIX PRECORDIAL 20090A SUCTION ELECTRODES AND ELECTRODE GEL PATIENT CABLE CLIP 2 400048 PNEUMOTACHO SENSOR SP 110 2 200510 NOSE CLIP 2 100025 FILTERS FOR SP 100 2 100026 Page 6 7 SCHILLER AT 10 ECG and Spirometry Unit Chapter 6 SERVICE HANDBOOK Is
17. To set the resistance of the thermal print head press lt gt The first figure of the resistance value is now highlighted and the new resistance value can be entered The entered value must be more than 1000 Ohms and less than 1800 Ohms If a resistance value outside of these limits is entered the user is prompted to enter the value again When the resistance is set press lt ENTER gt DACOFFS This is an indication of the offset value of the digital to analog converter used for load or speed conversion for bicycle ergometers and analog treadmills respectively To set this value proceed as follows 1 From monitor mode enter the exercise menu and select the bicycle option as follows EXERCISE 3 Exercise Settings 4 Treadmill Bicycle setup 1 1 Bicycle 1V 100W Press gt ENTER gt and exit the exercise menu 2 Commence an exercise test by pressing BEGIN Press the PROTOCOL key select 1 edit Protocol 1 and manually set the base load to 100 W 3 Wait 30 seconds and press NEXT STAGE 4 Measure the voltage at pin 5 of the Stress connector Using the YES and NO keys set the DACOFFS value to obtain a reading of 1 00V 5mV INAOFFS and AIN4 This offset ensures that the correct load input value is interpreted from a bicycle The INAOFFS gives the value 32 to 31 ofthe offset and the AIN4 gives the actual value To set this offset proceed as follows 1 Connect a power supply with an
18. U31 and U32 form a latch circuit for the pixel memory and allow picture freeze when required The video signal to the Video LCD Converter is gated with signal SCINV which inverts the screen image changes the LCD to white on black image when set Certain control and enable signals from the video controller are further decoded by GAL U38 Video LCD Converter The video LCD converter chip U74 generates all the timing and strobe signals required by the LCD and converts the serial video signal into the correct format for display Four upper and four lower control and data signals are output to the LCD along with two clock signals A working memory for the converter chip is provided U75 Power On Reset The Power on reset circuit is formed by U54 and associated components The circuit controls the master reset of the CPU This circuit has three functions as follows e Provides a delay on initial switch on to ensure that the power supply is fully stabilized and to give the 200ms reset time required by the 68000 processor Ensures that the system is inoperative and in reset mode when the SYSEN indicates that the Program Pack is not present e Disables the unit if the 5V rail drops below 4 75V Page 2 18 Chapter 2 Functional Overview SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 TOHLNOD o 994 59 fido OL vivd 994 WIYAS 1993 ddAg 7 ddAg
19. accuracy of at least 0 1 to pin 4 of the stress connector Set the power supply to 1 0V Page 5 19 Chapter 5 SCHILLER AT 10 ECG and Spirometry Unit Functional Checks amp Adjustments SERVICE HANDBOOK Issue c April 2002 Offset Screen cont 2 Adjust INAOFFS using the left and right cursor until a reading of 1000 mV 5 is obtained at AIN4 INSOFES and AINS This offset ensures the correct reading for analog input of RPM bicycle or elevation analog treadmill The procedure to adjust this offset is the same as for INAOFFS but the PSU must be connected to pin 1 of the stress connector and the UP and DOWN keys are used for adjusting the value B TEMP and AIN6 This displays the battery temperature and the battery temperature in volts received from the transducer BV and AINO BV indicates the voltage level of US that is the battery voltage or the primary dc voltage generated by the power factor controller from the mains and used for battery charging The actual voltage level of US is calculated from the BATTV signal sheet 5 of the power supply circuit diagram and shown on this screen as AINO The value of BV is approximately 26 8V nom 27V when working from the mains and between 24V and 21V when using battery power The AINO indication signal BATTV is 4000mV 100 when working from the battery and 4400mV 100 when working from the mains BCHARGE AINI and B CAPACITY AINI gives a voltage value in
20. disconnected The batteries must be removed Tools e Narrow blunt instrument for unlatching the assembly catches Small flat bladed screwdriver Parts Mains Assembly Part number as detailed in Chapter 6 WARNING ENSURE THAT THE MAINS CABLE IS DISCONNECTED BEFORE COMMENCING Mains Assembly Removal To remove the assembly proceed as follows 1 Disconnect the crimped flying lead connectors on the back of the assembly 2 Using a narrow blunt instrument unlatch the two bottom retaining catches Unlatch the top catch and remove the assembly from the Mains Assembly securing bracket on the Base Assembly Note The Mains Assembly is retained in position with three tensioned catches Access to the two bottom catches is gained from the bottom of the Base Assembly via two access holes GROUND Page 4 33 Chapter 4 SCHILLER AT 10 ECG and Spirometry Unit Physical Overview amp Module Replacement SERVICE HANDBOOK Issue c April 2002 Mains Assembly cont Mains Assembly Replacement 1 Ensure that the mains voltage selector is set to the correct voltage for the application as indicated by an arrow in the selector and fuse sub assembly If the voltage is not set for the required voltage proceed as follows Using small flat bladed screwdriver gently prise the selector and fuse sub assembly away from the main assembly Lift the retaining clip securing the voltage plate and remove the plate
21. e Flat Bladed screwdriver Parts Mains Transformer Part number as detailed in Chapter 6 WARNING ENSURE THAT THE MAINS CABLE IS DISCONNECTED BEFORE COMMENCING Mains Transformer Removal To remove the Mains Transformer proceed as follows 1 Disconnect the two power supply bayonet connectors on the Power Supply board 2 Disconnect the flying lead connectors to the Mains Assembly 3 Unscrew the centre screw of the Mains Transformer and remove from the Base Assembly Mains Transformer Replacement To replace the mains transformer proceed as follow 1 Position the Transformer and secure to the Base Assembly with the centre screw 2 Connect the flying leads to the Power Supply and to the Mains Assembly See the Power Supply paragraph and Mains Assembly paragraph respectively for the connector colours Checks and Tests after Replacement After assembly connect mains to the unit and ensure that the green power LED lights Page 4 35 Chapter 4 SCHILLER AT 10 ECG and Spirometry Unit Physical Overview amp Module Replacement SERVICE HANDBOOK Issue c April 2002 LCD Keyboard Buffer MK 8 4 The LCD Keyboard Buffer board is situated in the Top Assembly adjacent to the Keyboard It is secured in position with three retaining screws The DC AC Converter board part of the LCD assembly is soldered to the LCD Keyboard Buffer board Pre requisites The Warnings and Cautions at the beginning of the Chapter m
22. gt a a bd Eu EN a E xxu 5 5 26 EA 8 z amp 4 Eu gt o 2 M um mE x GEM a 0 xs o om a Eid 3 Q lt S9 a zi 5 E98 3 e jr EYES DK gt x 85 8o n LLI T eS men l wt av 2222 E a eu dv 2 x 4 Zu z o oa 5 SEES e e BAD f SEED s 2 a zs S2 aes e The top line of the keyboard is dual purpose and when the unit is in the ECG mode these keys double as control for the direct setting of speed and sensitivity for manual printout Otherwise the alphanumeric keyboard serves as a normal keyboard for data input Page 1 5 SCHILLER AT 10 ECG and Spirometry Unit Chapter 1 SERVICE HANDBOOK Issue c April 2002 Operating Elements The Keyboard cont Control Keys The Control keys are situated at the top of the keyboard and contain the function keys which are common to all function modules The control keys are as follows PATIENT _ DATA Entry of patient data CHANGE Switch displayed information Initiate data transmission SEND nee SCREEN _ DATA gt PRINT Print screen contents STORE SCREEN DATA d Initiate data storage COPY Initiate copy RECEIVE bd Initiate receive mode DATA
23. interface from the ECG Amplifier Pixel information Shift clock for XDn Frame synchronisation LCD off Baseline reset on the ECG amplifier from the processor Page 8 7 Chapter 8 SCHILLER AT 10 ECG and Spirometry Unit Glossary SERVICE HANDBOOK Issue c April 2002 Page 8 8
24. load is sent and received Serial Ports The communications controller contains USARTS which generate serial signals for the transmis sion and reception of data The communications driver circuit contains interface circuits to ensure signal level compatibility with RS 232 The RS 422 connector is used when high data rates are required or when longer cable lengths are used Page 2 9 SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 Functional Overview Chapter 2 8 Mog peuonoung A ddng Imod i quvog HOSS300ud 8957 8 AN H344NE quvogA2y 021 MEE YALNNOO iue uossdooud igo NOISH3ANOO Ens 1 OL O1LLV8 AONShO3HUJ 1 LNAYYNO 1 L l 1 Ave 1 Ee E ant lt 9 1901 HS x
25. mains fuse When the LAN option is installed the LAN connector is mounted on the back panel Page 1 3 Chapter 1 Operating Elements SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 The Keyboard Alpha Numeric Keypad The functions of the dual purpose keys on the alphanumeric keyboard are as follows DUAL PURPOSE KEYS KEY FUNCTION to Printout Speed Selection 2 5 5 10 12 5 25 50 or 100 T mm s 8 to Printout Sensitivity Selection 2 5 5 10 or 20 mm mV General Purpose Keys The general purpose keys to the right of the alpha numeric keypad are as follows FNCT ESC NO EN YES 4 JL JL Call up main menu return E to Monitor mode ESC Return to previous menu NO Change setting disable command YES Change setting enable command The direction keys are used to move the cursor in order to make menu selections Page 1 4 SCHILLER AT 10 ECG and Spirometry Unit Chapter 1 SERVICE HANDBOOK Issue c April 2002 Operating Elements The Keyboard cont Z E P 9 8 om 2 5 5 Ok J o lt i RED a NUS t m EX e M ASA S ca x z E edes T A 240 v r iss a o zi m m 3 E ale
26. number identifies the type of module or module group for example electrical PCB mechanical component etc Module Number The individual module number Issue Letter This is always an upper case letter and gives the issue state of the module Modification Index This lower case letter gives the modification or build state of the module It is applicable only for the specific Issue The documentation associated with a module is identified by a letter in place of the module build group number For example the processor board for the AT 60 ECG unit without the Spirometry option has the article number 3 2180Ga The Circuit Diagram is S 2180Ga The Block Diagram is B 2180Ga Page 6 3 Chapter 6 Spare Parts SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 Page 6 4 The Component Layout is D 2180Ga The categories are as follows DOCUMENT CIRCUIT DIAGRAM 5 BLOCK DIAGRAM B COMPONENT LAYOUT D TEST DOCUMENTATION P ASSEMBLY DOCUMENTATION F Note that the Test Documentation and Assembly Documentation is usually available for internal use only SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 Chapter 6 Spare Parts AT 10 Spare Modules DESCRIPTION NUMBER KEYBOARD MK 8 3 ENGLISH 3 2233FA KEYBOARD MK 8 3 GERMAN 3 2232FA KEYBOARD MK 8 3 FRENCH 3 2234FA KEYBOARD
27. 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 Warnings indicate potential danger 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 parenthesis lt gt The character or character string given in parenthesis is the actual character that is printed on the key When a key sequence is provided it must be followed in the order given For example the key sequence to display the macro screen is as follows lt FNCT gt 2 ENTER This requires that the function key on the keypad is pressed followed by the 2 key followed by the return key Enter Page 4 11 Chapter 4 SCHILLER AT 10 ECG and Spirometry Unit Physical Overview amp Module Replacement SERVICE HANDBOOK Issue c April 2002 Safety Notes 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
28. press the 2nd key and then the programmed number key on the alphanumeric keyboard The sequence will remain stored until a new sequence overwrites the existing macro programmed for that key Page 1 14 SCHILLER AT 10 ECG and Spirometry Unit Chapter 1 SERVICE HANDBOOK Issue c April 2002 Operating Elements System Setup cont Save Settings Programmable parameters can be stored as base settings These stored settings are not erased when the unit is switched off To call up this function select the last item in the System Setup menu and the Save Settings menu is displayed as follows GLOBAL SAVE Push ENTER to save the screen settings and the entire actual device configuration To set your device to the SCHILLER factory settings push key BE See the AT 10 Operating Manual for full explanation By pressing ENTER the actual configuration will be permanently stored and confirmation is given with the message Settings memorized By pressing key X the factory default settings are activated Press lt ENTER gt and these settings are stored and confirmed through the message Settings memorized Page 1 15 Chapter 1 SCHILLER AT 10 ECG and Spirometry Unit Operating Elements SERVICE HANDBOOK Issue c April 2002 ECG Menu Page 1 16 To call up the menu for any of the main functions simply press the respective function key eg ECG for resting ECG EXERC
29. processor circuit under the control of the master CPU The graphics processor outputs a VGA standard serial video signal The video signal is converted to an LCD signal by the Video LCD circuit Miscellaneous Inputs Outputs Spirometry The serial input signal from the spirometer is connected to the interface circuit The serial data is clocked into a shift register in the interface circuit and when enabled the data is presented in parallel on the data bus for interpretation by the master CPU DC Inputs The dc input connectors allow analog signals for example from an ultra sound device or a phono pulse recording unit to be input to the AT 10 The analog inputs are converted to a digital level and presented on the data bus The maximum input voltage is 2 5 V p p Video Connector The video connector outputs the serial video signal generated by the graphics processor The video connector reflects the same data as that displayed on the LCD Page 2 6 SCHILLER AT 10 ECG and Spirometry Unit Chapter 2 SERVICE HANDBOOK Issue c April 2002 Functional Overview Overall Functional Description cont ERGO The analog stress I O circuit contains a digital to analog converter that converts load or speed control data to an analog voltage The elevation and speed of the treadmill is returned as an analog value and converted to digital data for interpretation by the main CPU When a bicycle is connected an analog signal representing the
30. serial interfaces and Data I O ports Data between the Communications Controller and the CPU is via a dual port RAM U13 which acts as a data buffer It is selected by the CSCC signal The inputs to the A D converter of the communications controller processor are as follows e Speed load LOADIN Elevation RPM RPMIN Temperature signal from the thermal print head Communication over the RS ports is via two dual communication interface controllers Each of the controllers monitor two RS ports as follows M PORT 1 BLOOD PORT3 DATA PRESSURE TRANSMISSION Ut7 K PORT 2 RS lt CONTROLLED PORT 4 TREADMILLS AND RS 422 BRGOMETERS The enable signals for the communication controllers are generated by U14 via a binary to octal converter U15 014 also outputs the TREADMILL UP and TREADMILL DOWN signals TMUP TMDN to control treadmill elevation via the Data I O port SCHILLER AT 10 ECG and Spirometry Unit Chapter 2 SERVICE HANDBOOK Issue c April 2002 Functional Overview Processor Board cont Stress Analog Input Output The analog input output circuit comprises a digital analog converter circuit and buffer circuits that carry out the following functions e Converts the control commands for an exercise equipment ergometer or treadmill to the required analog command signal a 12 bit DAC U40 produces the LOAD OUT signal ERGO 0 The output is 1V per 100 W e Buffers an
31. supply proceed as follows 1 Connect mains power to the unit and switch on by pressing the lt ON gt key on the keyboard 2 Measure the voltage at P25 pin 1 Adjust to achieve a voltage of 27V 200mV Power Rail Measurement No adjustment is possible for any of the power rails To check the power rail voltages go on the relevant test point component layout given at the end of this book and measure with a DVM If any of the values are out of tolerance first ensure that UB voltage is correct If this is correct the power supply must be changed Page 4 19 Chapter 4 SCHILLER AT 10 ECG and Spirometry Unit Physical Overview amp Module Replacement SERVICE HANDBOOK Issue c April 2002 Lead acid Batteries Two batteries are installed in the AT 10 They are self contained with integral leads and connectors Pre requisites The Warnings and Cautions at the beginning of the Chapter must be observed The Top Assembly must be removed as detailed in Paragraph 2 and all external cable assemblies disconnected Parts The part numbers of all replaceable items are given in Chapter 6 BATTERY 2 BATTERY 1 Battery Removal WARNING THE MAINS SUPPLY MUST BE DISCONNECTED DURING THIS PROCEDURE To remove the battery proceed as follows Ensure that the unit is switched off and that the mains is disconnected Remove all cable assemblies connected to the front and rear panels 2 Disconnect the battery connec
32. the two inner screws also secure the end connector and remove the board ECG Amplifier Board Replacement Secure the ECG Amplifier board in position with the four retaining screws Connect the cable to the Processor board and replace Paper Tray Assembly Power Supply board Top Assembly Page 4 31 Chapter 4 SCHILLER AT 10 ECG and Spirometry Unit Physical Overview amp Module Replacement SERVICE HANDBOOK Issue c April 2002 ECG Amplifier Board cont Checks and Tests after Replacement To prove the integrity of the replaced board carry out the following functional check procedure 1 Switch on the unit and connect a Schiller patient cable to the ECG connector Carry out a cable test by inserting each lead in turn into the lead test point Ensure that the green test LED lights when a patient lead is inserted O TEST LED O 2 Connect a suitable patient simulator to the ECG connector and carry out a resting ECG Ensure that all the leads can be displayed on the LCD Note The procedure to carry out an ECG test is given in the AT 10 operating manual Page 4 32 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement Mains Assembly Pre requisites The Warnings and Cautions at the beginning of the Chapter must be observed The Top Assembly must be removed as detailed in Paragraph 2 and all external cable assemblies
33. the voltage selector on the back panel is set for the required voltage and connect mains to the unit Switch on the mains and ensure that the green mains LED on the hinged LCD Assembly lights Switch the unit on by pressing the lt ON gt key on the Keyboard Ensure that the LCD lights and that for a few seconds the test screen is displayed at the bottom of the screen When the test screen disappears check that straight line traces are displayed for the selected leads and that the information box in the top right hand corner of the display is present Press lt FNCT gt lt 2 gt lt 2 gt and enter the time and date details Press lt ESC gt when complete Ensure that the correct date and time is displayed on the screen Connect the ECG phantom to the ECG connector on the side panel and switch the phantom on Ensure that a good ECG trace is displayed on the screen Press the PRINT SCREEN gt key and ensure that the print out is accurate and of good quality Press MAN START and ensure that the print out is accurate and of good quality Press the lt AUTO START key and wait approximately 10 seconds for the print out to commence Ensure that the print out is accurate and of good quality Connect the RS test cable to RS 232 ports 1 2 and 3 on the back panel and carry out the RS transmission test as detailed in Chapter 5 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module
34. 002 Functional Checks amp Adjustments Printer cont Printer Head Alignment Printer alignment is achieved with the three print head alignment tensioning screws Adjust the screws so that they are slightly indented below the frame Adjust to achieve the best quality print out THERMAL PRINT PRINTER HEAD HEXAGONAL ALIGNMENT P22 TO TP RETAINING SCREW ADJUSTMENT X2 MOTOR P32 P29 PRINT HEAD GUARD DATA CABLE INTERFACE wf MK 8 5 a 4 9 Fs d PRINT HEAD VRI P4 P23 PRINT HEAD P24 TO PRINT HEAD TENSIONING TESTPOINT1 DATA CABLE PHOTO RETAINING SCREWS X3 SENSOR ROD Page 5 7 Chapter 5 SCHILLER AT 10 ECG and Spirometry Unit Functional Checks amp Adjustments SERVICE HANDBOOK Issue c April 2002 RS Interface Testing RS Interface Error messages The following error messages are associated with the RS Interface If any of these error messages are displayed carry out the checks suggested SERIAL LINK TIME OUT This indication appears if no signal is received from the remote unit after approximately 30 seconds e Check that the remote unit is switched on and set to the correct parameters e Check the correct set up in both units XSSTORAGE key e Check that the connecting cable is correctly plugged in Check the integrity of the cable assemblies at both units e fusing a modem ensure that it is communicating with the r
35. 2 SERVICE HANDBOOK Issue c April 2002 Functional Overview ECG Amplifier cont Pacemaker Trigger The RA lead is fed before it is filtered to the pacemaker detection circuit The RAPACE signal from the patient is differentiated and fed to the ECG processor The negative pulses PMNEG and the positive pulses PMPOS indicate the start and end slope of the pacemaker pulse From the signals the CPU can calculate the timing of the pacemaker pulse for display software option Pacemaker pulse on RAPACE Differentiated Signal PMPOS PMNEG d Page 2 21 Chapter 2 SCHILLER AT 10 ECG and Spirometry Unit Functional Overview SERVICE HANDBOOK Issue c April 2002 ECG Amplifier cont Cable Tester ECG AMPLIFIER RS TEST POINT AND INTEGRAL LED Spe i RECTIFICATION e AND COMPARISON ELECTRODE F3 2 INPUT FILTER AMPLIFIER PATIENT CABLE My CONNECTOR i The cable tester circuit checks the resistance of an individual lead in the patient cable The resistance of the lead must be between 10KOhms and 1MOhms The cable tester comprises a 3 3kHz oscillator and comparator circuit The oscillator is connected to the test point and when a lead is connected to the test point the potential on the lead from the input filter and amplifier circuit alters the waveform The waveform is rectified and via a comparator U1B lights the LED The co
36. 9 TXD Page 7 6 SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 Chapter 7 Technical Data Pulmonary Function SP 110 Method of Measurement Measurement Ranges Volume Measurement Accuracy Flow Impedance Measured Values Prediction Equation Adults Children pneumotachometer Flow 0 to 14 I s 0 to 11 litres 2 less than 0 5 mbar s l at 10 l s VC ERV IRV TV FVC FEV FEV VC FEV VC FEV VC FEF MS FEF PEF MEF MV MVV FIVC FIV FIVC FIV FVC PIF MIF 1 0 FEV o FEV litres 0 2 1 2 1 0 Comparison pre post medication possible ECCS Berglund Finnish Indian Morris Crapo Knudson Quanjer amp Tammeling Indian Knudson Accessories for Pulmonary Function Testing Standard Accessories Optional Accessories Pneumotacho sensor SP 110 SP 20 SP 150 Disposable cardboard mouthpieces Nose clips Filter Calibration pump Page 7 7 Chapter 7 SCHILLER AT 10 ECG and Spirometry Unit Technical Data SERVICE HANDBOOK Issue c April 2002 Page 7 6 Chapter 8 SCHILLER AT 10 ECG and Spirometry Unit Glossary SERVICE HANDBOOK Issue c April 2002 Chapter 8 Glossary Contents Introduction 8 2 Acronyms 8 3 Page 6 1 Chapter 8 SCHILLER AT 10 ECG and Spirometry Unit Glossary S
37. Amplifier to recenter the ECG image on the LCD FIFOR First in first out read FLM Control signal 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 IPLO 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 Keyboard data in KBBEEP Keyboard beep to audio amplifier KBCLR Keyboard clear Keyboard clock KBCL2 Keyboard clock KBIN Keyboard data in serial data from the keyboard to the CPU KBS Keyboard Strobe KONV Convert this signal initiates the conversion of the incoming signal from the ECG Amplifier LA Left Arm LCA Liquid crystal address enable LCDAS LCD Address Strobe Page 8 4 SCHILLER AT 10 ECG and Spirometry Unit Chapter 8 SERVICE HANDBOOK Issue c April 2002 Glossary Acronyms LCDKONT LCD contrast sets the 18 V voltage level from which the LCD backlight power is generated and thus the contrast of the screen LCDW LCD Write LD1 2 3 4 Lower LCD data LDS Lower data strobe LED 0 3 Operate signals to the LED indicators on the keyboard LEDB Battery LED LEDMAINS Signal indicating mains connected to operate LED indicator on the keyboard L
38. DBOOK Issue c April 2002 LCD cont LCD Removal To remove the LCD proceed as follows WARNING HIGH VOLTAGES ARE GENERATED IN THE LCD ENSURE THAT THE MAINS IS DISCONNECTED BEFORE REMOVING THE LCD HOUSING COVER 1 Using a flat bladed knife or a small screwdriver remove the three LCD stops on the top of the LCD to gain access to the screws securing the LCD housing cover 2 Unscrew the three screws and gently ease the cover away from the LCD hinges at the bottom CAUTION THE RIBBON CABLE TO THE LCD DOES NOT HAVE A CONVENTIONAL PLUG AND IS INSERTED DIRECTLY INTO THE SIDE OF THE CONNECTOR ON THELCD TAKE CARE NOT TO DAMAGE THE RIBBON CABLE CONTACTS WHEN REMOVING THE RIBBON CABLE TAKE SPECIAL CARE WHEN REPLACING THE CABLE ASSEMBLY 3 Lift the retaining tape from the LCD connector on the back of the LCD and remove the ribbon cable to the LCD Buffer Board 4 Very gently and evenly prise the LCD away from the case until it is free Take care not to strain the ribbon cable 5 On LCD keyboard buffer board remove the power connector and the connector to the contrast control Remove the LCD 6 Remove the two retaining screws securing the contrast control to the Top Assembly LCD Replacement To replace the LCD proceed as follows 1 Ensure that the LCD recess is clean and free from grease dirt and any traces of adhesive Use a clean cloth and alcohol based cleaning agent to wipe the recess to ensu
39. E 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 SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 Safety Notices TO PREVENT ELECTRIC SHOCK DO NOT DISASSEMBLE THE UNIT NO SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED PERSONNEL ONLY DO NOT USE THIS UNIT IN AREAS WHERE THERE IS ANY DANGER OF EXPLOSION OR THE PRESENCE OF FLAMMABLE GASES SUCH AS ANAESTHETIC AGENTS 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 THIS PRODUCT IS NOT DESIGNED FOR STERILE USE SWITCH THE UNIT OFF BEFORE CLEANING AND DISCONNECT FROM THE MAINS DONOT UNDER ANY CIRCUMSTANCES IMMERSE THE UNIT OR CABLE ASSEMBLIES IN LIQUID DO NOT OPERATE THE UNIT IF THE EARTH CONNECTION IS SUSPECT OR IF THE MAINS LEAD IS DAMAGED OR SUSPECTED OF BEING DAMAGED DO NOT USE HIGH TEMPERATURE STERILISATION PROCESSES SUCH AS AUTOCLAVING DO NOT USE E BEAM OR 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 R
40. ERVICE HANDBOOK Issue c April 2002 Introduction 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 10 Only abbreviations that are specific to SCHILLER equipment are included here General electrical and electronic abbreviations are not included Page 8 2 SCHILLER AT 10 ECG and Spirometry Unit Chapter 8 SERVICE HANDBOOK Issue c April 2002 Glossary Acronyms OS Offset signal on the ECG amplifier 1 CPU Address Bus ALBEEP Alarm beeper signal to the audio amplifier The frequency of this signal is about 1000 Hz ANAI ANA2 Analog input from the experimental inputs DC1 and DC2 AS Address strobe BATT Signal to CPU indicating battery operation BATTLC Analog signal to the processor giving the charge condition of the battery BATTV Battery voltage analog signal from the power supply used by the processor to assess battery or mains operation BLOW Battery less than 11 3V LCD flashes when this signal is active When the battery voltage drops to below approximately 9 4V the unit is switched off These values apply to equipment with 12 V battery For other 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 communication interface circuits CI 0 10 RS interface contro
41. ESULT IN INJURY INACCURATE INFORMATION AND OR DAMAGE TO THE UNIT THE AT 10 COMPLIES WITH EMC REGULATIONS FOR MEDICAL PRODUCTS WHICH AFFORDS PROTECTION AGAINST EMISSIONS AND ELECTRICAL INTERFERENCE HOWEVER SPECIAL CARE MUST BE EXERCISED WHEN THE AT 4 IS USED WITH HIGH FREQUENCY EQUIPMENT 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 THEREIS NO DANGER WHEN USING THE ECG UNIT FOR A PACEMAKER PATIENT OR WITH SIMULTANEOUS USE OF OTHER 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 SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 Safety Notices THIS UNIT IS CF CLASSIFIED ACCORDING IEC 601 1 THIS MEANS THAT THE PATIENT CONNECTION IS FULLY ISOLATED AND DEFIBRILLATION PROTECTED SCHILLER CAN ONLY GUARANTEE PROTECTION AGAINST DEFIBRILLATION VOLTAGE HOWEVER WHEN THE ORIGINAL SCHILLER PATIENT CABLE IS USED WHEN NON MEDICAL DEVICES ARECONNECTED TO THERS 232 INTERFACEENSURE THAT BOTH UNITS ARE SECURELY CONNECTED TO THE SAME EARTH POTENTIAL WHEN OPERATING THE UNIT ON BATTERY AND SIMULTANEOUSLY USING NON MEDICAL DEVICES THE RS 232 INTERFACE MUST BE FULLY ISOLATED BEFORE USIN
42. G THE UNIT ENSURE THAT AN INTRODUCTION REGARDING THE UNIT FUNCTIONS AND THE SAFETY PRECAUTIONS HAS BEEN PROVIDED BY A SCHILLER REPRESENTATIVE THE GUIDELINES FOR PATIENT ELECTRODE PLACEMENT ARE PROVIDED AS ON OVERVIEW ONLY THEY ARE NOT A SUBSTITUTE FOR MEDICAL EXPERTISE THE AT 10 ECG UNIT IS PROVIDED FOR THE EXCLUSIVE USE OF QUALIFIED PHYSICIANS ORPERSONNEL UNDER THEIR DIRECT SUPERVISION THENUMERICAL AND GRAPHICAL RESULTS AND ANY INTERPRETATION DERIVED FROM A RECORDING MUST BE EXAMINED WITH RESPECT TO THE PATIENTS OVERALL CLINICAL CONDITION THE RECORDING PREPARATION QUALITY AND THE GENERAL RECORDED DATA QUALITY WHICH COULD EFFECT THE REPORT DATA ACCURACY MUST ALSO BE TAKEN INTO ACCOUNT ITIS THE PHYSICIANS RESPONSIBILITY TO MAKE THE DIAGNOSIS OR TO OBTAIN EXPERT OPINION ON THE RESULTS AND TO INSTITUTE CORRECT TREATMENT IF INDICATED vi SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 What s in this Book THE SERVICE PHILOSOPHY FOR ALL SCHILLER UNITS IS FAULT FINDING TO MODULE LEVEL THE PURPOSE OF THIS BOOK IS TO PROVIDE ALL THE INFORMA TION NECESSARY TO ENABLE THE SERVICE ENGINEER TO EFFICIENTLY LOCATE AND REPLACE A FAULTY MODULE THIS BOOK ASSUMES NO DETAILED KNOWL EDGE OF THE AT 10 BUT DOES REQUIRE THAT THE SERVICE ENGINEER IS FAMIL IAR WITH STANDARD WORKSHOP PRACTICES The book is divided into the following chapters Chapter 1 Operating Elements The purpose of t
43. H Communication Problems 3 14 Page 3 1 Chapter 3 SCHILLER AT 10 ECG and Spirometry Unit Fault Diagnosis SERVICE HANDBOOK Issue c April 2002 Introduction The purpose of this chapter is to provide fault finding procedures that will quickly and efficiently identify a fault on an AT 10 to a specific module The fault finding procedures are designed so that test equipment is kept to a minimum An initial fault diagnosis chart is provided detailing all the general fault indications that may occur When this is followed it will indicate the module where the fault lies or specify a further fault finding procedure When more than one module is stated the first module given is the one most likely to contain the fault If the fault is not found on the first module the other modules should be checked in the order given If the initial fault finding chart does not indicate the area where the fault exists re check all the settings and parameters that have been entered for the particular task that fails If these are correct check the software If this is correct suspect external connections If a key operation or menu selection is required when carrying out the functional checks after replacement the key sequence required is given in parenthesis lt gt The character s given in parenthesis is the actual character s printed on the key When a key sequence is provided it must be followed in the order given For example the key seq
44. ISE for exercise ECG etc To return from any menu directly to the Monitor mode press the lt FNCT gt key To return from any menu to the previous menu press the ESC key To call up the main restingECG menu press the ECG key 1 ECG Functions 2 QRS Beeper ON OFF 3 Freeze Release screen 4 Edit Interpretation 5 ECG Settings 6 Electrode Test SCHILLER AT 10 ECG and Spirometry Unit Chapter 1 SERVICE HANDBOOK Issue c April 2002 Operating Elements Filters There are five filters which can be set before starting the recording of an ECG To call up the menu for these filters press the lt ECG gt key then select option ECG Settings followed by Filters The following menu is displayed BASELINE FILTER Resting ECG 1 0 05 Hz Exercise ECG 2 0 05 Hz lt IEC 0 05 Hz gt Myogram Filter 3 35Hz Smooth Filter 4 NO Baseline Stabiliz 5 YES Mains Filter 6 50Hz PM Detection 7 YES 8 Settings Baseline Filter A digital baseline filter has been designed in order to suppress excessive baseline drifts By pressing key 1 for resting ECGs or key 2 for exercise ECGs the setting can be altered to one of the following values 0 50 0 25 0 12 or 0 05 Hz The value set is the lower limit of the frequency range and is normally set to 0 05Hz IEC recommendation i e a frequency range of 0 05 to 150Hz The settings 0 12 0 25 and 0 50Hz should only be used when a
45. M and DSP Removal The Program Pack is mounted in slides secured on the Processor board Access to the Program Pack is gained from the side panel under the Paper Tray CAUTION THE PROGRAM PACK CONTAINS STATIC SENSITIVE CMOS COMPONENTS OBSERVE ANTI STATIC PRECAUTIONS Use the attached handle to gently ease the Program Pack away from the connector To remove an EEPROM or DSP chip from the board use the special chip removal tool to gently and evenly ease the chip away from the socket Program Pack and program EEPROM and DSP Replacement Note The software version of a program EEPROM or DSP chip is written on the label attached to the chip Before replacing a program chip ensure that it is the correct software version for the application To replace an EEPROM or DSP chip position it above the socket so that the chip alignment notch is matched with the socket alignment notch Gently and firmly push home until retained by the connector To replace the Program Pack slide the pack in the board guides and gently and firmly push home Checks and Tests After Program Replacement 1 Switch the unit on by pressing the lt ON gt key on the Keyboard for approximately a second Ensure that the LCD lights and that for a few seconds the test screen is displayed at the bottom of the screen When the test screen disappears check that straight line traces are displayed for the selected leads and that the information box in the top right hand
46. MK 8 1 Part number as detailed in Chapter 6 VIDEO P1 TO Dc CONNECTOR POWER SUPPLY CONNECTORS P4 A TO ERGO P4 B TO DATA P2 TORS CONNECTOR CONNECTOR BOARD 2 E KA O yf ur e N s SPACERS FOR 7 POWER SUPPLY lt MOUNTING e KA Se e s PAPER TRAY P11 TO SECURING BEEPER POINT PROGRAM PACK P6 TO SP 110 ECG AMP CONNECTOR Page 4 26 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement Microprocessor Board cont Microprocessor Board Removal The Microprocessor board is secured to the Base Assembly with screws To remove the Microproc essor Board proceed as follows CAUTION THE MICROPROCESSOR BOARD CONTAINS CMOS COMPONENTS ANTI STATIC PRECAUTIONS MUST BE OBSERVED AT ALL TIMES 1 2 Note Remove the Top Assembly as detailed above Remove the Power Supply board Remove the Paper Tray Assembly as detailed above Remove the Program Pack Disconnect the following connectors from the Microprocessor board P4 A and B to the ERGO and DATA I O connectors on the back panel P6 to the ECG Amplifier P2 to the RS connectors on the Back Panel P11 to the Beeper Connector GND Unscrew and remove the six Microprocessor board securing screws one under the program pack and the four spacers for the Power Sup
47. NDBOOK Issue c April 2002 Chapter 7 Technical Data General Technical Data cont Data record Long term rhythm recordings Exercise ECGs with final report ECG storage Myogram filter muscle tremor filter Line frequency filter ECG amplifier Listing of ECG recording data date and time of recording patient data etc Versions M and C ECG measurement results intervals amplitudes electrical axes average complexes with optional measurement reference markings Version C ECG interpretation statements 1 lead 10 min page 1 lead 5 min page 1 lead 90 sec page automatic control of bicycle ergometer and treadmill user programmable Final report showing trendplots of heart rate load and blood pressure physical working capacity PWC 150 PWC 170 PWC max Versions M and C QRS and ST measurements Output memory for 10s 12 ECG leads Circular input memory for 10s 12 ECG leads The last 10s ECG can be copied from input memory to output memory by pressing one key An ECG can be copied from the output memory any number of times adjustable at 25 or 35 Hz only effective for printed ECG distortion free suppression of superimposed 50 or 60 Hz sinusoidal interferences by means of adaptive digital filtering simultaneous synchronous recording of all 10 active electrode signals 12 leads sampling frequency 4kHz digital re
48. NTENANCE PROCEDURES PERSONNEL MUST BE EARTHED WHEN HANDLING ANY BOARDS OR COMPONENTS ALWAYS USE AN ANTI STATIC BAG WHEN TRANSPORTING BOARDS OR COMPONENTS CARE MUST BE TAKEN WHEN REMOVING AND REPLACING CONNECTORS NEVER USE FORCE NEVER STRAIN THE CABLE ASSEMBLIES SCHILLER AT 10 ECG and Spirometry Unit Chapter 3 SERVICE HANDBOOK Issue c April 2002 Fault Diagnosis IS THE GREEN MAINS LED LIT Note The removal and replacement instructions and the location of all boards cable assemblies and connectors are given in Chapter 4 DOES THE LCD LIGHT TWO AT 10 Initial Fault Diagnosis Chart Sheet 1 Page 3 5 Chapter 3 Fault Diagnosis SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 IS THE DATA BOX DISPLAYED IN THE TOP RIGHT HAND ARE STRAIGHT LINE ECG TRACES DISPLAYED ON THE LCD PRINT SCREEN DOES HE PRINTER FUNCTIO PRINTER MOTOR FUNCTIONED IS THE PRINT QUALITY GOOD IS THE PRINTER FUNCTIONING MONITOR DISPLAYS DATA Page 3 6 ARE ECG TRACES DISPLAYED ON THE LCD DOES THE PRINT OUT GIVE THE ECG RACES AND PATIEN DOES THE EXERCISE TEST FUNCTION DOES THE SPIROMETRY TEST FUNCTION DO THE RS INTERFACES FUNCTION DOES THE PAPER TRAY EJECTION WORK CORRECTLY AT 10 Initial Fault Diagnosis Chart Sheet 2 SCHILLER AT 10 ECG and Spirometry Unit Chapter 3 SERVICE HANDBOOK Issu
49. Note The plate has contacts which are pushed into tensioned connectors a small screwdriver may be required to prise the plate away from the connectors Replace the voltage plate by pushing fully home Ensure that the correct voltage is displayed in the front and top voltage windows Click the sub assembly back in place in the Mains Assembly Note The fuse sub assembly containing the mains fuses is positioned under the voltage plate and is removed and replaced in the same way as above CAUTION IT IS POSSIBLE TO INSERT THE MAINS ASSEMBLY UPSIDE DOWN WHEN REPLACING THE ASSEMBLY ENSURE THAT THE MAINS ON OFF SWITCH IS UPPERMOST WITH THE MAINS CONNECTOR UNDER THE ON OFF SWITCH 2 Push the Mains Assembly into the Base Assembly until the catches engage with the bracket Ensure that the assembly is firmly in position 3 Reconnect the crimped cables Checks and Tests after Replacement After assembly connect mains to the unit and ensure that the green power LED lights Page 4 34 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement Mains Transformer Pre requisites The Warnings and Cautions at the beginning of the Chapter must be observed The Top Assembly must be removed as detailed in Paragraph 2 and all external cable assemblies disconnected Battery 1 and the EMC shield covering the transformer must be removed Tools
50. OCESSOR P17 GND BAYONET P12 TO LCD KEYBOARD BUFFER CONNECTOR IN TOP ASSEMBLY NOT USED i a rd ae oN Pad P27 FROM MAINS TRANSFORMER INTERFACE BATTERY CONNECTORS VRI UB VOLTAGE ADJUSTMENT Power Supply Board MK 8 6 Page 4 16 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement Power Supply Board MK 8 6 The Power Supply board is positioned on four spacers above the Processor board Pre requisites The Warnings and Cautions at the beginning of the Chapter must be observed The Top Assembly must be removed as detailed in Paragraph 2 and all external cable assemblies disconnected Tools and Equipment e Cross Bladed screwdriver Small flat bladed screwdriver Digital Voltmeter In addition if the Power Supply board is checked in isolation a Power Supply capable of supplying up to 30V is required Parts e Power Supply MK 8 6 Part number as detailed in Chapter 6 Power Supply Board Removal WARNING ENSURE THAT THE MAINS CABLE IS DISCONNECTED BEFORE COMMENCING To remove the Power Supply board proceed as follows 1 Disconnect the flying leads to the mains transformer and to the batteries Disconnect P20 to the Interface board P1 to the Microprocessor and the GND guard P17 P12 to the LCD Keyboard Buffer MK 8 4 will alre
51. OE Lower output enable control signal for static Ram LP Line synchronisation LSRAM Lower output enable control signal for static RAM LWE Lower Write Enable control signal for Static Ram M LCD control signal derived from FLM MCLK Motor Clock speed control for the printer motor MOD Control signal from the battery charging circuit MOFF Motor off MON Motor On Printer motor 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 mark detection signal PMPON Pacemaker detection pulse PMNEG Pacemaker negative indicates the trailing edge of a pacemaker pulse PMPOS Pacemaker positive indicates the leading edge of a pacemaker pulse PWM Pulse Width Modulation QTRRG QRS trigger output signal RA Right Arm RAS Row address strobe RES Reset Page 8 5 Chapter 8 SCHILLER AT 10 ECG and Spirometry Unit Glossary SERVICE HANDBOOK Issue c April 2002 Acronyms RESLCD Resets darkens the LCD RES P Error reset signal to inactivate the LCD RTS Ready to send ougoing serial data handshake with CTS RXD Receive data incoming serial data R W Read Write SC 0 8 System control bus CPU control signals SCINV Screen inversion SI Serial in SO Serial
52. OF THE CHAPTER MUST BE OBSERVED Tools Posi drive screwdriver Test Equipment The following test equipment is required to carry out the functional test after unit assembly Schiller Patient Cable Patient Simulator eg phantom 320 RS Test Cable supplied by Schiller Top Assembly Removal The Top Assembly is mounted on the Base Assembly and is secured to the Base Assembly with four screws and washers access to the screws is gained from the underside of the unit To remove the Top Assembly proceed as follows 1 a Remove all cable assemblies connected to the side and rear panels Ensure that the mains cable is removed Taking care to secure the hinged LCD module so that it cannot swing open turn the unit up side down and rest on a soft cloth Unscrew the six retaining screws and washers situated in the extreme corners and edges of the unit indicated by an arrow Grasping the top and bottom of the unit to ensure that the two assemblies cannot part carefully return the unit to the standing position Gently lift the Top Assembly sufficiently to gain access to the interconnecting cable and disconnect the connector from the Power Supply Board Gently lift the Top Assembly away from the Base Assembly and place on a soft cloth Page 4 13 Chapter 4 SCHILLER AT 10 ECG and Spirometry Unit Physical Overview amp Module Replacement SERVICE HANDBOOK Issue c April 2002 Opening the Case cont Top Assemb
53. ONNECTORS 2 310 042 STANDARD TOOL AVAILABLE ON THE MARKET DESCRIPTION 2MM HEXAGONAL KEY FOR THE REMOVAL REPLACEMENT OF THE PROGRAM PACK SCHILLER NUMBER 4 950074 HEXAGONAL CROSS BLADED SCREWDRIVER USED FOR MANUFACTURED THE REMOVAL AND REPLACEMENT OF THE PRINT HEAD BY WERA NUMBER WERA 367 TX 210180 Page 3 3 Chapter 3 Fault Diagnosis SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 Fault Diagnosis Page 3 4 Use the fault finding charts and procedures on the following pages to indicate a faulty area or module In most cases the fault finding charts should indicate the most likely faulty area Whena possible faulty module is indicated by the fault finding charts the module must be replaced 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 set up or check procedures required are given in Chapter 4 WARNINGS MAINS POWER IS PRESENT WHEN THE UNIT COVER IS REMOVED CERTAIN CHECKS AND ADJUSTMENTS CAN ONLY BE CARRIED OUT WITH THE TOP ASSEMBLY REMOVED AND MAINS CONNECTED WHEN CARRYING OUT THESE PROCEDURES BEWARE THAT POTENTIALLY LETHAL VOLTAGES ARE PRESENT CAUTIONS THE AT 10 CONTAINS STATIC SENSITIVE CMOS COMPONENTS OBSERVE ANTI STATIC PRECAUTIONS ALWAYS PLACE THE UNIT ON AN EARTHED ANTI STATIC MAT WHEN CARRYING OUT ANY MAI
54. PRESENT CAUTIONS THE AT 10 CONTAINS STATIC SENSITIVE CMOS COMPONENTS OBSERVE ANTI STATIC PRECAUTIONS WHENCARRYING OUT ANY MAINTENANCE PROCEDURES ALWAYS PLACE THE UNIT ON AN EARTHED ANTI STATIC MAT PERSONAL MUST BE EARTHED WHEN HANDLING ANY BOARDS OR COMPONENTS ALWAYS USE AN ANTI STATIC 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 Page 4 12 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement Opening the Case Pre requisites The unit must be placed on an anti static mat and anti static precautions observed when any maintenance is carried out on the AT 10 The room temperature should be between 18 and 28 degrees Mains supply is required to carry out the unit functional test after assembly THE WARNINGS AND CAUTIONS AT THE BEGINNING
55. PROM CS signal Memory Dynamic RAM The Dynamic RAM comprises four 1 Mbyte RAM modules The RAM control signals are generated by the gate array U47 The RAM data is transparently refreshed via CAS before RAS control protocol at approximately IKHz The dynamic RAM stores the following data Printer pixel pattern Printer text data Stress test ECG data Rhythm ECG data Static RAM and EEPROM The two 128k RAM chips U25 amp U26 are addressed via address lines AO to A19 they are enabled by the CSSRAM signal The static RAMs use the back up power supply so that the stored data is not lost when the unit is switched off Page 2 15 Chapter 2 SCHILLER AT 10 ECG and Spirometry Unit Functional Overview SERVICE HANDBOOK Issue c April 2002 Processor Board cont The static RAM stores the following Last 10 seconds of ECG data Patient data The AT 10 EEPROM memory stores some user defined parameter settings and comprises a single 64k EEPROM chip U27 It shares an enable signal CSRTCC with the real time clock U30 Communications Controller Page 2 16 The Communications Controller carries out the following functions Controls the serial ports e Converts the incoming analog values from the ERGO connector to digital and vice versa e Provides synchronization of the peripheral devices with the CPU The communications controller comprises a single chip processor U14 with built in RAM and ROM to control the
56. Physical Overview amp Module Replacement SERVICE HANDBOOK Issue c April 2002 Program Pack and Software Modules 4 29 Program Pack and program EPROM and DSP Removal 4 30 Program Pack and program EPROM and DSP Replacement 4 30 Checks and Tests After Program Replacement 4 30 ECG Amplifier Board 4 31 ECG Amplifier Board Removal 4 31 ECG Amplifier Board Replacement 4 31 Checks and Tests after Replacement 4 32 Mains Assembly 4 33 Mains Assembly Removal 4 33 Mains Assembly Replacement 4 34 Checks and Tests after Replacement 4 34 Mains Transformer 4 35 Mains Transformer Removal 4 35 Mains Transformer Replacement 4 35 Checks and Tests after Replacement 4 35 LCD Keyboard Buffer MK 8 4 4 36 LCD Keyboard Buffer Removal 4 38 LCD Keyboard Buffer Replacement 4 38 Checks after Replacement 4 38 LCD 4 39 LCD Removal 4 40 LCD Replacement 4 40 Checks after LCD Replacement 441 Thermal Printer and Print Head 4 42 Thermal Printer Removal 4 42 Print Head Removal 4 42 Print Head Replacement 4 42 Thermal Printer Replacement 4 44 Checks Tests and Adjustments after Printer Replacement 4 44 Keyboard 4 45 Keyboard Removal 4 45 Keyboard Replacement 4 46 Checks after Replacement 4 46 Page 4 2 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement Introduction The AT 10 comprises two main assemblies as follows The Base Assembly The Top Assembly The Base Assemb
57. Replacement Opening the Case cont 8 Press the PATIENT DATA key and systematically press the keys lt QWERTZUIOP gt ENTER 1234567890 Ensure that the entered data is presented on the screen as entered Press lt ESC gt to exit from the patient data display 9 Press the BEGIN key and ensure that the AT 10 indicates that an exercise test has commenced Press the STOP key and ensure that a print out is given 10 Enter the required static parameter values Store the entered parameter values by pressing lt FNCT 2 5 Note Details of all parameters and parameter values are provided in the AT 10 Operating Manual 11 If a module has been replaced carry out the checks and tests detailed in the relative Paragraph if not already carried out Switch the unit off and leave connected to the mains supply for 15 hours to fully charge the battery Ensure that the Battery LED is extinguished when the battery is fully charged 12 Disconnect the mains power supply and leave the unit for 24 hours Switch the unit on and check that the battery LED lights Ensure that all static parameters have been remembered Leave the unit switched on for 45 minutes without using the printer and check that the battery LED does not start to flash in that time Page 4 15 Chapter 4 Physical Overview amp Module Replacement SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 P1 TO MICROPR
58. SBCIOR CONNECTOR OUNTED ON AND SWITCH P1 TO POWER ig ASSEMBLY SUPPLY WORM DRIVE P4 TO ERGO FOR PAPER or CONNECTOR CARRIAGE MOTOR GROUND BOARD Dci PAPER TRAY PAPER TO MICRO FRAMEWORK PROCESSOR CARRIAGE SP 110 BOARD MOTOR CONNECTOR SUPPORT P6 TO ECG AMPLIFIER BRACKET Base Assembly Paper Carriage extended and Power Supply Board Interface Board and Battery Removed Page 4 6 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement Base Assembly cont The metal paper tray framework allows the paper tray to be withdrawn The dual rotation paper carriage motor turns a worm drive to slide the paper tray in or out Page 4 7 Chapter 4 SCHILLER AT 10 ECG and Spirometry Unit Physical Overview amp Module Replacement SERVICE HANDBOOK Issue c April 2002 DC AC CONVERTER P13 TOLCD KEYBOARD BOARD BUFFER WITH LCD APERTURE FOR RIBBON CABLE TOLCD P13 TO P12 TO TO LCD CONTRAST KEYBOARD POWER POWER CONTROL SUPPLY TO CONTRAST LCD CONTROL TO LCD Keyboard Assembly Page 4 8 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement Top Assembly The Top Assembly is manufactured from moulded plastic and comprises a Main Housing with a hinged LCD Assembly
59. SCHILLER AT 10 ECG and Spirometry Unit Functional Overview SERVICE HANDBOOK Issue c April 2002 Page 2 2 SCHILLER AT 10 ECG and Spirometry Unit Chapter 2 SERVICE HANDBOOK Issue c April 2002 Functional Overview Block Diagram DC 1 DC2 SP 110 R RS 232 x 3 AND ONE RS 422 DATA ERGO VIDEO ECG AT 10 Basic Block and Interconnection Diagram Page 2 3 Chapter 2 SCHILLER AT 10 ECG and Spirometry Unit Functional Overview SERVICE HANDBOOK Issue c April 2002 Brief Description The AT 10 comprises the following boards and major functional areas Power Supply The power supply rectifies the mains input and generates all the required voltages for the AT 10 electronics Two rechargeable 12V batteries connected in series provide the power for the printer and enable the AT 10 to operate for about one hour when mains is not present Processor Board The Processor Board is the master control for all peripherals and contains the main CPU system timing circuits and the unit RAM memory This board also contains the following Video signal generation circuits and the video LCD conversion circuit for the LCD Program Pack containing the unit software Print control keyboard timing and graphics control circuits The Processor Board communicates externally over the following connectors Serial RS 232 and RS 422 interfaces for connection of RS controlled treadmills and blo
60. SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 Cardiovit AT 10 ECG and Spirometry Unit Service Handbook SCHILLER AG Altgasse 68 CH 6341 Baar Switzerland Phone 41 41 766 42 42 Fax 41 41 761 08 80 Home page http www schiller ch April 2002 Article Number 2 540 005 SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 AT 10 Service Handbook Article Number 2 540005 Issue 1 January 1993 Issue 2 July 1998 Issue c April 2002 Associated Documents Guide to SCHILLER Interpretation and Measurement Program E D F Article No 2 510179 SCHILLER AT 10 USER GUIDE English Article No 2 510127 SCHILLER AT 10 USER GUIDE German Article No 2 510126 SCHILLER AT 10 USER GUIDE French Article No 2 510128 93 42 EEC Medical Devices CE 0123 0123 Notified Body P S Copyright 2002 by SCHILLER AG SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 Where to Obtain Service WELCH ALLYN SCHILLER Inc 7420 Carroll Road San Diego CA US 92121 2334 USA USA Canad anada Tel 1 858 635 6023 Fax 1 858 635 6611 Home Page www welchallyn com SCHILLER Asia Pacific 10 Jalan SS 3 33 Taman Universiti 47300 Petaling Jaya Selangor Asia Pacific Malaysia Tel 603 7877 5336 Fax 603 7877 5744 SCHILLER HmbH Kampmiillerweg
61. THE PAPER JAM OR NOT STOP AT THE CORRECT POSITION DOES THE PROBLEM STILL EXIST Note The removal and replacement instructions and the location of all boards cable assemblies and connectors are given in Chapter 4 AT 10 Fault Diagnosis Chart Sheet D Printer Problems Page 3 10 SCHILLER AT 10 ECG and Spirometry Unit Chapter 3 SERVICE HANDBOOK Issue c April 2002 Fault Diagnosis ARE THE PATIENT LEADS ALL WITHIN TOLERANCE NUMBER OF COPIES SET TO 0 AT 10 Fault Diagnosis Chart Sheet E Auto Mode Problems Page 3 11 Chapter 3 SCHILLER AT 10 ECG and Spirometry Unit Fault Diagnosis SERVICE HANDBOOK Issue c April 2002 NO IS A DIGITAL RS CONTROLLED STRESS TEST EQUIPMENT PROBLEMS WITH BLOOD PRESSURE MEASUREMENT DOES THE PROBLEM STILL EXIST AT 10 Fault Diagnosis Chart Sheet F Exercise Mode Problems Page 3 12 SCHILLER AT 10 ECG and Spirometry Unit Chapter 3 SERVICE HANDBOOK Issue c April 2002 Fault Diagnosis FLOW SENSOR AND CABLE OK E CAN THE CALIBRA TION PROCEDURE BE CARRIED OUT Note The removal and replacement instructions and the location of all boards cable assemblies and connectors are given in Chapter 4 AT 10 Fault Diagnosis Chart Sheet G Spirometry Problems Page 3 13 Chapter 3 SCHILLER AT 10 ECG and Spirometry Unit Fault Diagnosis SERVICE HANDBOOK Issue c April 2002 COMPATIBLE IN BOTH THE TRANSMI
62. TO PREVENT SCRATCHING PLACE THE TOP ASSEMBLY ON A NON ABRASIVE CLOTH WHEN UP SIDE DOWN 2 Remove the keyboard connector from the LCD Keyboard Buffer PCB CAUTION TO PREVENT DAMAGE TO THE TOP ASSEMBLY HOUSING DO NOT ATTEMPT TO PRISE THE KEYBOARD FROM THE FRONT OF THE UNIT 3 From the bottom of the assembly through the housing aperture apply pressure to the Keyboard with a blunt instrument until the keyboard lifts 4 When the keyboard has lifted return the Top Assembly to the upright position and remove the Keyboard from the recess 5 Using a clean cloth and a cleaning agent wipe the Keyboard recess to remove any traces of adhesive or dirt that may prevent good adhesion Page 4 45 Chapter 4 SCHILLER AT 10 ECG and Spirometry Unit Physical Overview amp Module Replacement SERVICE HANDBOOK Issue c April 2002 Keyboard cont Keyboard Replacement The Keyboard comes complete with double sided adhesive tape for fixing the board in position To replace a keyboard proceed as follows 1 Ensure that the Keyboard recess is clean and free from grease dirt and any traces of adhesive Use a clean cloth and a cleaning agent to wipe the keyboard recess to ensure a good adhesion surface Remove the protective backing from the adhesive tape precisely position the board and gently place in position When the Keyboard is correctly positioned use a clean cloth to firmly press down on the keyboard to ensure
63. TTING Note The removal and replacement instructions and the location of all boards cable assemblies and connectors are given in Chapter 4 AT 10 Fault Diagnosis Chart Sheet H Communication RS Problems Page 3 14 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement Chapter 4 Physical Overview amp Module Replacement Contents Introduction 4 3 Base Assembly 4 4 Top Assembly 4 9 Removal and Replacement 4 11 Opening the Case 4 13 Top Assembly Removal 4 13 Top Assembly Replacement 4 14 Functional Check After Assembling the AT 10 4 14 Power Supply Board MK 8 6 4 17 Power Supply Board Removal 4 17 Power Supply Board Replacement 4 17 Checks and Tests after Power Supply Board Replacement 4 17 Checking the Power Supplies 4 18 Lead acid Batteries 4 20 Battery Removal 4 20 Battery Replacement 4 21 Checks and Tests After Battery Replacement 4 21 Interface Board MK 8 5 4 22 Interface Board Removal 4 22 Interface Board Replacement 4 23 Checks and Tests After Interface Board Replacement 4 23 Paper Tray Assembly 4 24 Paper Tray Removal 4 24 Paper Tray Replacement 4 25 Checks and Tests after Paper Tray Assembly Replacement 4 25 Microprocessor Board 4 26 Microprocessor Board Removal 4 27 Microprocessor Board Replacement 4 27 Checks and Tests After Microprocessor Board Replacement 4 26 Page 4 1 Chapter 4 SCHILLER AT 10 ECG and Spirometry Unit
64. U28 and U29 which decode the timing instructions from the CPU encoded on the data bus The timers are accessed by the CSEE signal The timing signals produced are as follows MCLK The printer motor clock The faster the speed of the motor the faster the paper feed ISYS A general purpose timing clock of 2 kHz used as system interrupt determines sampling rate printing rate etc TPDUR The duration that the print head is heated This is calculated by the CPU from the resistance of the print head and the measured ambient temperature of the print head ALBEEP KBBEEP Audio signals for the alarm and keyboard beeper The timers are addressed by address lines A1 and A2 to select the required timing The frequency of the master clock input is 5 MHz Page 2 17 Chapter 2 SCHILLER AT 10 ECG and Spirometry Unit Functional Overview SERVICE HANDBOOK Issue c April 2002 Processor Board cont Graphics Controller A VGA standard signal 480 rows with 640 pixels row with a horizontal sync of approximately 31 8 KHz and a vertical sync of 60 Hz is generated by a graphics processor chip U39 and associated components The video controller also generates all the necessary protocol signals HSYNC VSYNC etc The parallel data output of the video controller is fed to two 8 bit shift registers U33 and U34 which together convert the 16 bit parallel output from the video controller to the required serial video output Two RAM chips
65. ad Replacement The Thermal Printer must be removed to replace the print head The print head comes complete with the data cable assemblies connected x2 To replace the print head in the printer assembly proceed as follows 1 Remove the three print head tensioning screws Assemble the three spring and brass spacers and insert the springs into the tensioning screws aperture so that the brass spacer adjoins the print head Loosely fasten the three print head tensioning screws Page 4 42 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement Thermal Printer and Print Head cont 2 Carefully insert the print head retaining rod and secure with the hexagonal print head retaining screw 3 Adjust the print head tensioning screws so that the head of the screws are indented and an even print head spring tension is achieved THERMAL PRINT PRINTER HEAD HEXAGONAL ALIGNMENT P22 TO TP RETAINING SCREW ADJUSTMENT X2 MOTOR P32 P29 PRINT HEAD GUARD DATA CABLE F3 a INTERFACE y MK 8 5 ra Pd ln PRINT HEAD VRI P4 P23 PRINT HEAD P24 TO PRINT HEAD TENSIONING TESTPOINT 1 DATA CABLE PHOTO RETAINING SCREWS X3 SENSOR ROD Page 4 43 Chapter 4 SCHILLER AT 10 ECG and Spirometry Unit Physical Overview amp Module Replacement SERVICE HANDBOOK Issue c April 2002 Thermal Printer and Print Head cont
66. ady be removed 2 Unscrew the four screws securing the board to the spacers and remove the board Power Supply Board Replacement To replace the Power Supply proceed as follows 1 Position the board on the spacers and secure with the four securing screws 2 Connect the Mains Transformer leads and the battery leads Connect P1 P20 and P17 GND Checks and Tests after Power Supply Board Replacement After assembly connect the mains supply to the unit and ensure that the green mains supply LED is lit Switch the unit on and ensure that the LCD is lit and that meaningful data is displayed Press the PRINT SCREEN key Ensure that the printer functions Page 4 17 Chapter 4 Physical Overview amp Module Replacement SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 Power Supply Board MK 8 6 cont Check that the battery charge monitor circuit is functioning as follows 1 Switch the unit off but leave the mains connected Leave the battery to charge for 10 hours Check that the battery light flashes when the battery is charging and extinguishes when the battery is fully charged after a maximum time of 15 hours 2 Disconnect the mains and run the unit on battery power for 60 minutes without using the printer Check that the battery LED lights when running on battery power the battery LED flashes when the battery capacity is low the unit switches off when the battery capacity f
67. al 31 3 kHz vertical 60 Hz Pin Connections Pin2 Video Pin 11 DISP Pin 5 Test Pin 13 H SYNC Pin 7 Video GND Pin 14 V SYNC Pin 9 D CLK Pin 10 Sync GND Experimental Input Connectors DC1 DC2 Jack plug positive and negative RS 232 V24 Serial Interface Interface numbers 1 2 and 3 Protocol Asynchronous Baud Rate 75 to 153600 Baud Byte Format 1 start bit 8 data bits 0 or 1 parity bit or programmable 1 1 5 2 stop bits programmable Transfer Control by means of DTR DSR CTS RTS Connection Socket 3 x D subminiature 9 pole female wired as DTE Data Terminal Equipment Page 7 5 Chapter 7 SCHILLER AT 10 ECG and Spirometry Unit Technical Data SERVICE HANDBOOK Issue c April 2002 Connectors cont Pin Connections Channel 1 2 3 Pin 3 TXD1 0 output data Pin 2 RXDII input data Pin 7 RTS1 0 request for output Pin 8 51 I ready for output Pin 6 DSRI1 I transfer unit ready Pin 4 DTRI 0 AT 10 ready Pin 5 GND RS 422 Serial Interface Protocol Asynchronous Baud Rate 75 to 153600 Baud Byte Format 1 start bit 8 data bits 0 or 1 parity bit or programmable 1 1 5 2 stop bits programmable Transfer Control None Connection Socket 1 x D sub 9 pole Pin connections 1 GND Pin 2 TXC Pin 3 TXC Pin 4 RXC Pin 5 RXC Pin 6 RXD Pin 7 RXD Pin 8 TXD Pin
68. alls below a preset value Note Control of the Battery LED is from the CPU which uses the counter signal to calculate the charge state of the battery If the Battery LED is not giving the expected indications the fault may lie on the Processor board or P1 connector The signal to control the battery LED is LEDB The nominal battery capacity at which the Battery Low is active LED flashing is 2596 The nominal voltage at which the Battery down signal is active and the unit switches off is 21V Checking the Power Supplies Page 4 18 The power supply voltages can be checked without the AT 10 being assembled However the Power Supply board is easily accessible and it is usually easier to check the power supplies with the unit assembled and the Top Assembly positioned by the side If the board is to be checked in isolation a latch circuit must be manually set to switch on the power supply equivalent to pressing the ON key Test points are provided on the Power Supply board for measurement of all power rails Individual adjustment is not possible for any of the voltage rails except UB from which all other supplies are generated and the batteries are charged Note that UB can only be adjusted with mains connected On Signal Simulation If the Power Supply board is checked in isolation the on line must be connected to GND to latch the power supply on To simulate the on signal proceed as follows Note The on si
69. ard data and contains the high voltage circuit for the LCD Page 2 5 SCHILLER AT 10 ECG and Spirometry Unit Chapter 2 SERVICE HANDBOOK Issue c April 2002 Functional Overview o943 eov Sd 255 54 xoorg 9T Lv Avidsid QHVOBA3M INIHd WO103130010Hd HOLOW Nee 4 ED 4 ae 1 5 939 aovid3u 1 HOLOW l TWWYSHL H3dVd HOLOW H3avd E 1 QHVOSASM O1 pope SS e i u3iNHOJSNVH L H31H3ANOO NOILYTOSI od od pipe eere H31H3ANOO HOLVIOSI 9T OldO H3TIOHINOO 305539059 I QV3H 2 2 IN Hala 993 H3TIOH1NOO x c c C e CR TOHINOO
70. as follows 1 Connect a digital voltmeter across the P4 connector test point 1 2 Switch the unit on and adjust VR1 to obtain a reading as follows NB gt 3 0 V when the black paper mark is under the paper mark detector 0 2 to 0 4 V when there is no paper mark under the detector ie white paper IF THE DETECTION DOES NOT RECOGNISE THE PAPER MARK AFTER ADJUSTMENT ENSURE THAT THE PAPER MARK WINDOW IS CLEAN Page 5 15 Chapter 5 SCHILLER AT 10 ECG and Spirometry Unit Functional Checks amp Adjustments SERVICE HANDBOOK Issue c April 2002 Self Test Screens Electrode Test Screen There are three test screens built into the AT 10 for use by the service engineer The first screen provides test information of the patient cable and electrode application The second screen gives the value of certain reference voltages and important internal synchronisation measurements and the third screen gives variable settings and measurements The first two screens are for information only and no adjustment can be made to these values Additional test equipment is required to carry out some of the settings on the third screen The three test screens are as follows Electrode Test Screen This screen indicates the electrode offset voltage and can indicate any faults in the patient cable or patient electrode Self Test Screen This screen displays ECG internal reference voltages and internal measurements of synchronisation and other parameters
71. ates the EJECT signal This produces a clock input to the flip flops and activates the GO IN signal to the motor controller In the same manner as when the paper tray is being extended the current sense circuit stops the motor when the paper tray has fully returned The flip flop control circuit monitors the printer motor via the MON signal and the paper tray motor via the Stop signal paper tray motor active This ensures that the circuit is disabled if the REPLACE PAPER key is pressed when either the printer motor or paper tray motors are active Page 2 25 Chapter 2 SCHILLER AT 10 ECG and Spirometry Unit Functional Overview SERVICE HANDBOOK Issue c April 2002 Page 2 26 SCHILLER AT 10 ECG and Spirometry Unit Chapter 3 SERVICE HANDBOOK Issue c April 2002 Fault Diagnosis Chapter 3 Fault Diagnosis Contents Introduction 3 2 Test Equipment 3 3 Fault Diagnosis 3 4 AT 10 Initial Fault Diagnosis Chart Sheet 1 3 5 AT 10 Initial Fault Diagnosis Chart Sheet 2 3 6 AT 10 Fault Diagnosis Chart Sheet A Power Problems 2 4 AT 10 Fault Diagnosis Chart Sheet B Power Problems 3 8 AT 10 Fault Diagnosis Chart Sheet C General Problems 3 9 AT 10 Fault Diagnosis Chart Sheet D Printer Problems 3 10 AT 10 Fault Diagnosis Chart Sheet E Auto Mode Problems 3 11 AT 10 Fault Diagnosis Chart Sheet F Exercise Mode Problems 3 12 AT 10 Fault Diagnosis Chart Sheet G Spirometry Problems 3 13 AT 10 Fault Diagnosis Chart Sheet
72. ation and archiving of recorded data Page 1 2 SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 Chapter 1 Operating Elements Introduction cont The main operating and connection modules of the Cardiovit AT 10 are as follows Keyboard LCD Screen Thermal Printer Right hand Side Panel Left hand Side Panel Rear Panel The keyboard is divided into three functional areas The top area comprises the unit ON OFF keys the paper tray key and other general function keys The central area contains dedicated control and function keys and the bottom area contains the alpha numeric keys and other general function keys The LCD screen displays the real time ECG traces and certain operating and status information Under operator control the display also gives menu options and displays operator entered data The display is folded down when not in use The printer provides hard copy of test results The side panel contains dc input connectors the ECG patient connector the Spirometry connector and RS serial connectors When the floppy disk storage optionis installed the disk drive is installed on this side panel This panel contains the paper tray and below the paper tray the program pack The rear panel contains the data input output connector the external video monitor and the ERGO connector The rear panel also contains the mains connector with on off switch voltage selector and
73. bsolutely necessary as the possibility exists that they could affect the original ECG signal especially the ST segments Pressing key 4 5 or 7 toggles the smooth filter the baseline stabilisation or the pacemaker detection circuit on or off The current baseline filter setting is indicated at the bottom of the screen Once the setting has been changed firstly press the FILTER key in order to reset this indication Myogram Filter The myogram filter suppresses disturbances caused by strong muscle tremor This filter can be switched on and off by pressing the FILTER key When set to off the displayed setting will be 150Hz When set to on the selected cut off frequency 25 or 35Hz will be indicated To alter the setting for the filter press key 3 and the cut off frequency can be set to either 25 or 35Hz The current Myogram filter setting is indicated at the bottom of the screen to the right of the baseline filter setting Once the setting has been changed press the FILTER key in order to reset this indication The stored ECG can be printed either with or without passing the myogram filter Note Using the myogram filter causes wave amplitudes on the printout to be reduced by as much as 20 Average cycles and measurement values however are not affected by this filter Mains Filter The mains filter is an adaptive 50Hz 60Hz digital interference filter designed to suppress ac interference without attenuatin
74. c input voltage to the UB switching regulator is cut by switching off Q5 A short circuit protection circuit formed by Q4 C3 and associated components monitors for undervoltage which indicates high current and a possible short circuit If an undervoltage is detected Q5 is switched off On Off Control and Low Battery Voltage Monitoring The supply for the 5 and 12V regulators is controlled by an on off control circuit The switch of the on off control circuit is Q11 It is initially switched on by the ON signal from the keyboard and then latched by the 45V supply When the OFF signal from the processor goes low Q11 is switched off the power to the switching regulators is cut and the unit is switched off The voltage of the battery is monitored by comparator U6C monitoring the US power rail If the voltage drops below 18 8V battery voltage low Q11 is switched off In the same manner if an overcurrent or overvoltage 12V is detected Q11 is switched off via U7B Page 2 11 Chapter 2 SCHILLER AT 10 ECG and Spirometry Unit Functional Overview SERVICE HANDBOOK Issue c April 2002 Power Supply cont 5V and 12V Switching Regulators The 5V and 12V step down switching regulators both function in the same manner The description given here is for the 12V regulator Power FETs Q9 and Q10 form a push pull circuit which switches the supply to loading coil T2 The power FET control circuit is formed by U6A which m
75. connected to GND To simulate the on signal proceed as follows 1 Connect mains to the unit and switch the mains on 2 Using a suitable lead connect GND to Plug P12 pin 25 and hold for 2 seconds The power supply will now be latched on and all generated power supplies can be checked for the correct voltage Note To switch the power supply off connect GND to P1 pin 50 UB Adjustment To check and adjust UB supply proceed as follows 1 Connect mains power to the unit and switch on Latch the power supply on as detailed above 2 Measure the voltage at connector P25 pin 1 Adjust VR1 to achieve a voltage of 27V z200mV Note The test point where measurement is taken is situated after the On Off switch If no voltage is present ensure that the on off switch Q11 is switched on To check the voltage before the On Off switch measure the voltage on fuse 12 Power Rail Measurement No adjustment is possible for any of the power rails To check the power rail voltages go on the relevant connector pin and measure with a DVM If any of the values are out of tolerance first ensure that UB voltage is correct If this is correct the power supply must be changed Page 5 5 Chapter 5 SCHILLER AT 10 ECG and Spirometry Unit Functional Checks amp Adjustments SERVICE HANDBOOK Issue c April 2002 Printer To check the printer and to ensure that every pixel is operational a built in printer test is provided To carry out the
76. corner of the display is present 2 Switch the unit on and check that the correct software version as stated on the label is installed To do this press the key sequence lt ECG gt lt 6 gt electrode test lt gt period The software version is displayed on the LCD See Chapter 5 for software details 3 Carry out the AT 10 functional check detailed on page 14 Page 4 30 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement ECG Amplifier Board The ECG Amplifier is mounted next to the Processor board and is secured to the Base Assembly with four screws Pre requisites The Warnings and Cautions at the beginning of the Chapter must be observed The Top Assembly must be removed as detailed in Paragraph 2 and all external cable assemblies disconnected The Power Supply board must be removed as detailed in Paragraph 3 The Paper Tray Assembly must be removed as detailed in Paragraph 6 Tools and Test Equipment e Cross Bladed screwdriver e Flat bladed screwdriver Parts ECG Amplifier board Part number as detailed in Chapter 6 ECG Amplifier Board Removal CAUTION THE ECG AMPLIFIER CONTAINS STATIC SENSITIVE CMOS COMPONENTS OBSERVE ANTI STATIC PRECAUTIONS To remove the ECG Amplifier proceed as follows 1 Disconnect the cable assembly to the Processor board P6 2 Unscrew the four corner securing screws
77. ction between the Power Supply board the Transformer the Batteries and the Mains Connector and Switch assembly is achieved by flying leads The Program Pack is inserted via a cut out in the side panel under the paper tray It is mounted in slides and connects directly with the Processor Board One captive screw secures the Program Pack in position Cut outs in the back and side panels are provided for external connectors The Video DC1 DC2 and the Spiro SP 110 connectors are all mounted directly on the Microprocessor board The Patient connector is mounted directly on the ECG Amplifier All other connectors are mounted on dedicated mounting plates Page 4 4 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement P32 P1 TO P2 RS INTERFACE TO GROUND BATTERY MICROPROCESSOR MICROPROCESSOR NOT USED P12 TO LCD PRINTER PONI GROUNDING KEYBOARD MOTOR DATA POINT BUFFER BATTERY THERMAL P24 TO 20 TO PAPER P25 P26 BAT PATIENT PRINTER PAGE CARRIAGE POWER TERY CONNEC CONNECTOR MARK MOTOR SUPPLY TORS SENSOR P23 TO P22 TO TP BUZZER P20 TO P27 FROM MAINS PRINTER MOTOR INTERFACE TRANSFORMER DATA BOARD Base Assembly Top Assembly Removed Page 4 5 Chapter 4 SCHILLER AT 10 ECG and Spirometry Unit Physical Overview amp Module Replacement SERVICE HANDBOOK Issue c April 2002 P3 VIDEO GOR
78. d scales the returned analog responses from the ergometer or treadmill The returned signals are LOAD IN ERGO 1 also used for the treadmill speed input The load signal is 100W z 1V RPM IN ERGO 2 also used for the treadmill elevation input The RPM signal scaling is 1V 100 RPM the elevation angle scaling is 1V 12 These signals are converted to a digital signal by the A D converter in the Communications Controller Thermal Print Head Controller The thermal print head controller circuit comprises programmable generic array logic GAL chips and latch buffers Data to be printed is presented on the data bus and strobed through first in first out FIFO memories U60 and U61 in two bytes lower DO to D7 upper D8 to D15 The 10 input 8 output GALs are programmed to serialise data from the FIFOs memories and send it in the required format for the printer To ensure a superior quality print the print head data is cycled so that each pulse is repeated eight times This is carried out by FIFO memory U59 TPD is the print head serial data signal TPSO and TPS1 are printer strobes and TP clock is the 4 MHz serial data clock The output to the printer is synchronized with the 1 9kHz clock The temperature control for the print head is set by the TPDUR signal thermal print duration from the programmable timer which is strobed by signal TGATE 6kHz Programmable Printer Timer and Beeper The timer circuit comprises
79. d the Power Supply Checks and Tests After Interface Board Replacement The paper mark detection offset must be checked To set the paper mark threshold proceed as follows 1 Connect a digital voltmeter across the P4 connector test point 1 2 Switch the unit on and adjust VR1 to obtain a reading as follows gt 3 5V when the black paper mark is under the paper mark detector 0 4 to 0 5V when there is no paper mark under the detector ie white paper NB IF THE DETECTION DOES NOT RECOGNISE THE PAPER MARK AFTER ADJUSTMENT ENSURE THAT THE PAPER MARK WINDOW IS CLEAN 3 Carry out the printer check to ensure that the board is functioning correctly Enter the following key sequence lt ECG gt 6 electrode test lt P gt A print out of a series of diagonal lines will be given Examine the print out and ensure that all the lines are even and uninterrupted Ensure that the complete paper is covered with close diagonal lines and that no blocks of plain paper are present Any faulty print head pixels will be seen as a horizontal white line Examine the print out for evenness of print Note Unevenness of print or faulty individual pixels indicates a problem with the printer or printer alignment If a complete block is left unprinted it additionally indicates that the Interface board could be faulty or the fault lies with the printer data control circuits on the Processor board Page 4 23 Chapter 4 Physical Overview amp Modu
80. dicating the loading control level of the battery from the PSU signal BATTLC The voltage range is OmV to 2500mV OV indicates that the battery is fully charged 2500mV indicates that the battery is fully discharged Because every battery varies the processor initially calculates the capacity of the battery so that it knows when to generate the battery low signal the B CAPACITY indication gives the calculated capacity of the installed battery When a new battery installed it must be fully charged and fully discharged a minimum of two times so that the processor can accurately assess the capacity of the new battery The BCHARGE indication shows the remaining battery capacity and is calculated from BATTLC signal AINI indication Note The battery capacity displayed on the LCD information box is the actual remaining capacity of the battery and is calculated from B CAPACITY and AINI The remaining capacity displayed in the information box will not necessarily be the same as that shown for BCHARGE K This character indicates the type of print head which is used Two types are available K Manufacturer Kyochera R Manufacturer Ricoh Page 5 20 SCHILLER AT 10 ECG and Spirometry Unit Chapter 5 SERVICE HANDBOOK Issue c April 2002 Functional Checks amp Adjustments Software and Options To check the software version of the unit and to display all the systems options that have been installed proceed as follows Display the
81. e c April 2002 Fault Diagnosis ARE ALL THE ASSEMBLIES AND CONNECTORS OK IS THE MAINS FUSE OK YES NO Note The removal and replacement instructions and the location of all boards cable assemblies and connectors are given in Chapter 4 AT 10 Fault Diagnosis Chart Sheet A Power Problems Page 3 7 Chapter 3 SCHILLER AT 10 ECG and Spirometry Unit Fault Diagnosis SERVICE HANDBOOK Issue c April 2002 ARE ALL THE ASSEMBLIES AND CONNECTORS OK IS THE AC VOLTAGE READING APPROXI MATELY 18 V IS THE AC MAINS SUPPLY GOOD ARE ALL POWER SUPPLIES OK Note The removal and replacement instructions and the location of all boards cable assemblies and connectors are given in Chapter 4 AT 10 Fault Diagnosis Chart Sheet B Power Problems Page 3 8 SCHILLER AT 10 ECG and Spirometry Unit Chapter 3 SERVICE HANDBOOK Issue c April 2002 Fault Diagnosis ARE ALL THE CAB ASSEMBLIES AND CONNECTORS OK ARE ALL POWER SUPPLIES OK MONITOR DISPLAYS DATA Note The removal and replacement instructions and the location of all boards cable assemblies and connectors are given in Chapter 4 AT 10 Fault Diagnosis Chart Sheet C General Problems Page 3 9 Chapter 3 SCHILLER AT 10 ECG and Spirometry Unit Fault Diagnosis SERVICE HANDBOOK Issue c April 2002 WAS THE PRINTER RESISTANCE CORRECT WERE THE READINGS CORRECT DOES
82. e keyboard Off signal from the Microprocessor Off key pressed on keyboard Reset pressed Batt Down 5V supply below 4 75V e Overcurrent condition on the 12V rail Two 12V batteries connected in series directly provide the power for the thermal printer and provide power for the switching regulators when mains is not connected The charge state of the battery is monitored by a battery charge monitor circuit Processor and Memory The AT 10 is controlled by a high speed CMOS 68000 processor with a 16 bit data bus and 23 bit address bus The clock speed is 16 7 MHz The processor works in conjunction with a dedicated gate array which is custom programmed to perform specific tasks The working RAM memory comprises 256 kByte of static RAM and 2MByte of dynamic RAM The dynamic RAM holds the ECG or spirometry data and other variables and an EEPROM holds the operator selectable parameters The unit software comprises 256kBytes of EPROM contained on the program pack A digital signal processing chip also situated on the program pack is used for real time processing of ECG data ECG The ECG signal from the patient is low pass filtered amplified and applied to the processor and multiplexer circuit The ECG Amplifier board carries out the following e Analog to digital conversion of the ECG signal at a sampling rate of 4KHz Reduction of the sampling rate to IKHz Detection of pacemaker signals and Determination of the pulse widt
83. eady to start the input and output tests Test Output e On the AT 10 press the lt STORAGE gt key and select Test mode Make sure that the settings are 19200 bps parity N stopbit 1 Set Channel No 3 e Press key 5 Test output on channel on AT 10 The AT 10 now sends a string of alphanumerical characters which are echoed in the Hyperterminal window on the PC AT 10 HyperTerminal GI x File Edit View Call Transfer Help is S13 olal i BCDEFGHLIKLMNOPORSTUVWEY2 _ abedefghijklmnopqrstuvwxyz ee 012 3BCDEFGHIJKLMNOPQRSTUVWIYZ X abedefghijklmnopqrstuvwxyz amp 01 23456789 8ABCDEFGHIJKLMNOPQRSTUVUUXYZ Stop the test by pressing key lt 7 gt End of test input output Page 5 13 Chapter 5 SCHILLER AT 10 ECG and Spirometry Unit Functional Checks amp Adjustments SERVICE HANDBOOK Issue c April 2002 RS 232 Transmission Reception Test cont Test Input In the RS 232 test window press the key 6 Test input on channel n The upper part of the RS 232 test window is erased to be able to display incoming messages Onthe PC type any characters and verify that they are echoed on the AT 10 AT 10 HyperTerminal OL File Edit Call Transfer BCDEFGHIJKLMNOPQRSTUVWXYZ X abecdefghijklmnopqrstuvwxyz f 9 amp 012 3BCDEFGHIJKLMNOPORSTUVWXYZ X abedefghijklmnopqrstuvwxy
84. ed Chapter 5 Functional Checks amp Adjustments 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 Chapter 6 Spare Parts 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 Chapter 7 Technical Data The full technical specification of the AT 10 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 10 circuit diagrams vii SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 What s in this Book Circuit Diagrams amp Board Layouts The circuit diagrams and component layouts are provided for all boards These details are provided for information only viii SCHILLER AT 10 ECG and Spirometry Unit Chapter 1 SERVICE HANDBOOK Issue c April 2002 Operating Elements Chapter 1 Operating Elements Contents Introduction 1 2 The Keyboard 1 4 Alpha Numeric Keypad 1 4 General Purpose Keys 1 4 Control Keys 1 6 Function Keys 1 7 Resting ECG Function Keys 1 7 1 7 Exercise Function Keys 1 8 Connector Panels 1 9 Side Panel 1 9 Back Panel 1 10 Mains Panel 1 11 Liquid Crystal Display 1 12 Calibrati
85. emote modem TRANSMISSION ERROR This is a general fault indication e Check that the remote unit is switched on and set to the correct parameters e Check that the connecting cable is correctly plugged in Check the integrity of the cable assemblies at both units e fusinga modem ensure that it is communicating with the remote modem NO ECG IN MEMORY An ECG transmission has been attempted but no ECG is stored in the units memory Store an ECG in the memory and attempt the transmission again If the same message appears change the Processor board Page 5 8 SCHILLER AT 10 ECG and Spirometry Unit Chapter 5 SERVICE HANDBOOK Issue c April 2002 Functional Checks amp Adjustments RS Interface Testing cont RS Self Test The RS interface self test ensures that the RS communication circuit on the Processor board is functioning To carry out the RS self test proceed as follows 1 Connect the RS test cable to RS ports 1 2 and 3 as indicated on the RS plugs 2 Switch the AT 10 on Press the STORAGE key and then select the Test Mode option and self test with test plug The self test starts and a pass or fail message appears on the LCD An audible indication is given that the test is complete Test Failure If this test fails ensure that the cable assembly is wired and connected correctly If the test cable assembly is correct a fault is indicated on the Processor Board or Power Supply Test Pass When t
86. ers Check the LCD and ensure that the correct characters are displayed as entered Page 4 41 Chapter 4 SCHILLER AT 10 ECG and Spirometry Unit Physical Overview amp Module Replacement SERVICE HANDBOOK Issue c April 2002 Thermal Printer and Print Head Pre requisites The Warnings and Cautions at the beginning of the Chapter must be observed The Top Assembly must be removed All external cable assemblies must be disconnected Tools e Cross Bladed Screwdriver e Hlat Bladed Screwdriver e Hexagonal screwdriver Torx TX10 Flat ended pliers Part Numbers The part number for the Thermal Printer and print head is given in Chapter 6 CAUTION THE THERMAL PRINTER CONTAINS IS STATIC SENSITIVE OBSERVE ANTI STATIC PRECAUTIONS Thermal Printer Removal To remove the Thermal Printer disconnect all connectors to the Interface board unscrew the four corner printer securing screws gently lift the printer and remove the complete assembly Print Head Removal To remove the Thermal Print Head after the printer assembly has been removed from the Top Assembly proceed as follows 1 Slacken the three print head tensioning screws and remove the three springs and brass spacers 2 Using the hexagonal screwdriver slacken the hexagonal print head retaining screw and carefully remove the print head retaining rod with a pair of pliers 3 Gently ease the thermal print head away from the printer assembly Print He
87. g or distorting the ECG By pressing key 6 the filter can be set according to country requirements to either 50Hz for most European countries or 60Hz for the USA or switched off Page 1 17 Chapter 1 SCHILLER AT 10 ECG and Spirometry Unit Operating Elements SERVICE HANDBOOK Issue c April 2002 Number of Printed Copies Page 1 18 The number of copies to be printed out can be pre selected To do this press the lt ECG gt key select the ECG Settings Further Settings menu option and then select Number of copies 1 Press key 1 several times to select the required number of copies either 1 2 3 4 or none The unit will now produce the specified number of ECG copies whenever the lt AUTO START or COPY key is pressed SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 Chapter 1 Operating Elements Lead Sequence The lead sequence can be set to either Standard or Cabrera The sequence required can be selected by pressing the lt ECG gt key selecting the ECG Settings Further Settings menu option and then selecting 12 Lead Sequence 2 Press key 2 to toggle between Standard and Cabrera leads Lead Groups Standard Cabrera I VI II V4 aVL VI II V4 II V2 aVF V5 I V2 aVF V5 V6 aVR V3 V6 aVR V4 V2 V7 II V4 V2 V7 aVL V5 V4 V8 aVF V5 V4 V8 aVF V6 V5 V9 V6 V5 V9 Page 1 19 Chapter
88. g the Flow Sensor Filter 5 23 Page 5 1 Chapter 5 SCHILLER AT 10 ECG and Spirometry Unit Functional Checks amp Adjustments SERVICE HANDBOOK Issue c April 2002 Check and Adjustment Procedures General Confidence Check The procedure detailed here is a general confidence check in the unit after an internal module or board has been replaced It is not a full functional test but is intended to identify any faults that may be present after the unit has been reassembled To carry out the general confidence check of the AT 10 proceed as follows 1 Ensure that the voltage selector on the back panel is set for the required voltage and connect mains to the unit Switch on the mains and ensure that the green mains LED lights 2 Switch the unit on by pressing the ON key on the keyboard Ensure that the LCD lights and that for a few seconds the test screen is displayed at the bottom of the screen When the test screen disappears check that straight line traces are displayed for the selected leads and that the information box in the top right hand corner of the display is present 3 Press lt FNCT gt 2 2 and enter the time and date details Press lt ESC gt when complete Ensure that the correct date and time is displayed on the screen 4 Connect the ECG phantom to the ECG connector on the side panel and switch the phantom on Ensure that a good ECG trace is displayed on the screen 5 Press the PRINT SCREEN key and e
89. good adhesion Turn the Top Assembly up side down and connect the keyboard connector to the LCD Keyboard Buffer board Checks after Replacement 1 After assembly connect mains to the unit and switch on Ensure that the mains LED lights 2 Switch the unit on and ensure that the LCD lights and that straight line traces are displayed Page 4 46 for the selected leads Ensure that the information box in the top right hand corner of the display is clearly defined and that all characters are correctly formed Enter the patient data screen by pressing lt PATIENT DATA gt and systematically press each of the keyboard characters Check the LCD and ensure that the correct characters are displayed as entered SCHILLER AT 10 ECG and Spirometry Unit Chapter 5 SERVICE HANDBOOK Issue c April 2002 Functional Checks amp Adjustments Chapter 5 Functional Checks amp Adjustments Contents Check and Adjustment Procedures 5 2 General Confidence Check 5 2 Power Supply 5 3 Printer 5 6 Printer Resistance 5 6 Printer Head Alignment 5 7 RS Interface Testing 5 8 RS Interface Error messages 5 8 RS Self Test 5 9 RS 232 Transmission Reception Test 5 11 Test Input Output 5 11 Test Output 5 13 Test Input 5 14 Error Codes 5 14 Interface Board Adjustments 5 15 Paper Mark Adjustment 5 15 Self Test Screens Electrode Test Screen 5 16 Electrode Test Screen 5 16 Self Test Screen 5 17 Offset Screen 5 19 Software and Options 5 21 Replacin
90. gs for example time and date which will have been lost when the battery was disconnected Page 4 21 Chapter 4 SCHILLER AT 10 ECG and Spirometry Unit Physical Overview amp Module Replacement SERVICE HANDBOOK Issue c April 2002 Interface Board MK 8 5 Pre requisites The Warnings and Cautions at the beginning of the Chapter must be observed The Top Assembly must be removed as detailed in Paragraph 2 and all external cable assemblies disconnected Tools e Cross bladed screwdriver Small flat bladed screwdriver Parts Interface Board MK 8 5 Part number as detailed in Chapter 6 P32 P29 PRINT HEAD p24 TO PHOTO GUARD DATA CABLE SENSOR INTERFACE BOARD MK 8 5 P22 TO TP P TOTAPER MOTOR TEST POINT 1 CARRIAGE MOTOR UNDER P23 PRINTHEAD POWER SUPPLY DATA CABLE UNDER Page 4 22 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement Interface Board MK 8 5 cont Interface Board Removal To remove the Interface Board disconnect all connectors unscrew the four screws securing the board to the Paper Tray Assembly and lift the board away from the Paper Tray Assembly Interface Board Replacement The replace the Bus Interface position the board on the Paper Tray Assembly and secure using the four captive screws Reconnect all connectors to the Thermal Printer an
91. h of a pacemaker signal Transmission of the processed ECG and PM measurements and status signals over the opto isolators Page 2 7 Chapter 2 SCHILLER AT 10 ECG and Spirometry Unit Functional Overview SERVICE HANDBOOK Issue c April 2002 Overall Functional Description cont The serial input output is transmitted to the master CPU at 2 5 MBaud and commands are received from the master CPU at 38 4 kBaud To ensure absolute patient safety an isolation transformer galvanically isolates the AT 10 power supply from the patient A cable tester circuit is also incorporated on this board which allows open circuit testing of the electrode leads It is automatically activated when a patient lead is connected to the test point Keyboard The keyboard is a matrix style circuit which is periodically scanned by the processor via the Keyboard Interface circuit When a key is pressed the key information is clocked to the Processor board for interpretation by the master CPU Printer Control The Thermal Print Head is controlled by the print head controller circuit and the timer circuit The print head controller serialises the parallel data written by the CPU into a 16 bit FIFO register The timer circuit controls how long current is applied to the head and thus the intensity of the print out The printer motor speed is controlled by the master CPU via the timer circuit Graphics Control The display data is generated in the graphics
92. head via the controller The paper mark detector is an opto sense circuit The output from the detector is fed to an operational amplifier U4 to set the PM signal when a paper mark is detected The input from the optocoupler is 0 4V to 0 6V for white paper and 3 5V to 4V for black paper ie paper mark The PM output signal is logic 0 when a paper mark is detected Page 2 23 Chapter 2 Functional Overview SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 ER Page 2 24 DIRECTION SENSE AND ENABLE FLIP FLOP CONTROL INTERFACE BOARD MK8 5 PART UB REPLACE PAPER A EJCT RUN ENABLE INIT INITIALISATION FROM MON CPU 5VOD 624V POWER REGULATOR GO IN MOTOR pae PAPER GOOUT CONTROLLER TRAY MOTOR CURRENT SENSE DELAY SCHILLER AT 10 ECG and Spirometry Unit Chapter 2 SERVICE HANDBOOK Issue c April 2002 Functional Overview Interface Board cont Paper Carriage Control The paper tray carriage motor control circuit works independently from the CPU and has its own power supply The power supply is enabled as follows e AT 10 switched on 5V latches transistor Q9 on which latches Q7 on to switch UB and generate Uop e AT 10 switched off pressing the REPLACE PAPER key sets signal EJCT to GND and switches transistor Q7 on to generate Uop f
93. his chapter is to provide an easy reference for all the main operator functions and to give a basic introduction to the AT 10 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 10 Operating Manual Chapter 2 Functional Overview This chapter provides a functional overview of the AT 10 The functional 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 Physical Overview amp Module Replacement This chapter gives an overview of the physical construction of the AT 10 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 replaceable 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 new module are also provid
94. his test passes it indicates that the fault lies in the remote equipment the transmission line or that the protocol of the two communicating devices are incompatible Check that all settings Parity Stop bit and the Baud rate are the same in both devices Reset all settings to ensure compatibility between the communicating devices Check that all settings Line or Modem Record or Block are correct for the application Are the settings compatible in both the transmitting and receiving devices Check the integrity of all cable connections Are all cables correctly connected to the programmed port Page 5 9 Chapter 5 SCHILLER AT 10 ECG and Spirometry Unit Functional Checks amp Adjustments SERVICE HANDBOOK Issue c April 2002 RS Interface Testing cont e e 5 493020 41 8 2 1 798 770 99939706 PORT 1 PORT2 RS Test Cable ART No 2 310 042 RS 232 Pin Connections PIN SIGNAL 3 Out Data Output 2 In Input Data 7 RTS1 Output Request to Send 8 CTS1 Input Clear to Send 6 DSRI Input Receive Unit Ready 4 DTRI Output AT 60 Ready 5 Ground Page 5 10 SCHILLER AT 10 ECG and Spirometry Unit Chapter 5 SERVICE HANDBOOK Issue c April 2002 Functional Checks amp Adjustments RS 232 Transmission Reception Test Test Input Out
95. ier board SKIP This counter gives the number of times re synchronisation is necessary by skipping one ECG sample On initial switch on this counter could read 5 to 10 Synchronisation is periodically required and over a 24 hour period the counter could be up to 100 NOTE For units using the ECG board MK 7 2 SW V 0 4 values are shown for Uref to CMSIG For units with ECG board MK 7 20 SW V1 20 these values are all zero Page 5 18 SCHILLER AT 10 ECG and Spirometry Unit Chapter 5 SERVICE HANDBOOK Issue c April 2002 Functional Checks amp Adjustments Offset Screen This screen gives the value and setting facility for the thermal print head resistance and the value and setting option of various analog offsets for analog controlled stress test devices A DVM is required to carry out the analog offset settings To enter the offset test screen proceed as follows From the electrode test screen press ENTER ENTER The following display is shown DACOFFS 3 RTPH 1129 IN4OFFS 3 AIN4 14 INSOFFS 2 AINS 9 B TEMP AING 0 BV 26 7 AINO 4360 BCHARGE 40 AIN1 1201 B CAPACITY 100 K This screen gives the following data and adjustments R TPH The value indicated here is the resistance of the thermal print head and must be set to the correct resistance to ensure a good quality print out The print head resistance is found on the printer and can be accessed by removing the printer cover plate
96. ins LED lights 2 Switch the unit on and ensure that the LCD lights and that straight line traces are displayed for the selected leads Ensure that the information box in the top right hand corner of the display is clearly defined and that all characters are correctly formed 3 Enter the patient data screen by pressing lt PATIENT DATA gt and systematically press each of the keyboard characters Check the LCD and ensure that the correct characters are displayed as entered Page 4 38 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement LCD The LCD comprises the LCD screen a contrast control and an DC AC Converter PCB mounted on the LCD Keyboard Buffer The LCD is secured in position with double sided tape Pre requisites e The replacement of the LCD must be carried out under clean room conditions The Warnings and Cautions at the beginning of the Chapter must be observed Tools and Disposables e Cross Bladed Screwdriver Long shafted cross bladed screwdriver e Flat bladed blunt knife e Anti static cleaning fluid alcohol based and clean cleaning cloth Parts The part number for the LCD assembly is given in Chapter 6 LCD STOPS AND COVER RETAINING SCREWS UNDER LCD HINGES Page 4 39 Chapter 4 SCHILLER AT 10 ECG and Spirometry Unit Physical Overview amp Module Replacement SERVICE HAN
97. int out of a series of diagonal lines will be given Carefully examine the print out 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 print out for evenness of print If the print intensity is uneven for example darker at the top than the bottom check the alignment of the printer and adjust the tension of the print head print head tensioning screws to obtain the best print out FAULTY PIXEL Page 4 44 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement Keyboard Pre requisites The Warnings and Cautions at the beginning of the Chapter must be observed The Top Assembly must be removed as detailed in Paragraph 3 and all external cable assemblies disconnected Tools and Materials Wide blunt instrument eg screwdriver handle for applying an even pressure to the board during removal Clean lint free cloth Cleaning agent such as alcohol or trichorethylene Part Numbers The part number for the keyboard PCB is given in Chapter 6 Keyboard Removal The Keyboard is secured in position with double side adhesive tape To remove the keyboard proceed as follows 1 Taking care to secure the hinged LCD module so that it cannot open turn the Top Assembly up side down CAUTION THE TOP ASSEMBLY IS SUSCEPTIBLE TO ABRASION DAMAGE
98. l Overview amp Module Replacement Paper Tray Assembly cont Paper Tray Replacement To replace the Paper Tray Assembly proceed as follow 1 Gently ease the assembly in position on the four spacers above the Processor board 2 Hold the two parts firmly together and turn upside down Secure the four screws retaining the Paper Tray Assembly to the Base Assembly 3 Turn right side up and replace P20 on the Power Supply 4 Replace the Top Assembly as detailed earlier Checks and Tests after Paper Tray Assembly Replacement After assembly connect mains to the unit and ensure that the green power LED lights Press the REPLACE PAPER key and ensure that the paper tray retracts smoothly Check the printer by entering enter the following key sequence lt ECG gt 62 electrode test lt P gt A series of diagonal line will be printed Ensure that the print out is even Page 4 25 Chapter 4 SCHILLER AT 10 ECG and Spirometry Unit Physical Overview amp Module Replacement SERVICE HANDBOOK Issue c April 2002 Microprocessor Board Pre requisites The Warnings and Cautions at the beginning of the Chapter must be observed The Top Assembly must be removed as detailed in Paragraph 2 and all external cable assemblies disconnected The Power Supply board and the paper tray assembly must be removed before removing the Processor board Tools e Cross Bladed screwdriver Parts e Microprocessor Board
99. l lines input CO 0 10 RS interface control lines output 19 KHz LCD latch pulse CL2 3 11 MHz LCD clock frequency CLK Clock Signal The number following the CLK indicates the frequency For example CLK 19 indicates a frequency of 19 MHz CS Chip select The general format of the chip select signals is CS followed by some characters The characters indicate the device to which the chip select signal appertains For example CSRTC is the chip select signal for the real time clock and CSEPROM is the select signal fot the EPROM etc CTS Clear to send General signal used in data communication D 0 15 Data Bus DACWR Digital analog converter wire DIO Data input output on the Data I O connector DMUX Data multiplexer DRAM Dynamic RAM DRC 0 6 Dynamic RAM control DS Data strobe Page 8 3 Chapter 8 SCHILLER AT 10 ECG and Spirometry Unit Glossary SERVICE HANDBOOK Issue c April 2002 Acronyms DSP Digital signal processor on program pack DTACK Transfer data acknowledge Bus signal to acknowledge transfer of data DTR Outgoing serial data turns modem on ECGI ECG in serial ECG data to the CPU sent over the optical interface ECGMUX The multiplexed ECG signal from the ECG amplifier ECGO ECG out serial ECG amplifier control data from the CPU sent over the optical interface EF Empty flag EJCT Eject paper tray EKGRES Reset signal to the ECG Amplifier This signal resets the ECG
100. le Replacement SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 Paper Tray Assembly The Paper Tray Assembly comprises a metal framework onto which is mounted the paper tray and motor the thermal printer and the interface board It is positioned above the Processor board and is mounted on four spacers Pre requisites Pa Page 4 24 The Warnings and Cautions at the beginning of the Chapter must be observed The Top Assembly must be removed as detailed in Paragraph 2 and all external cable assemblies disconnected Tools Cross Bladed Screwdriver Flat Bladed Screwdriver Parts The part number for the Paper Tray Assembly complete with the DC motor is given in Chapter 6 WARNING ENSURE THAT THE MAINS CABLE IS DISCONNECTED BEFORE COMMENCING per Tray Removal To remove the Paper Tray Assembly proceed as follows 1 Remove P20 on the Power Supply 2 Carefully turn the unit upside down and rest it on a soft cloth Remove the four screws retaining the paper tray assembly Hold the two parts together and turn them right side up Watch for screws falling out Taking care not to damage the printer motor gently ease the complete Paper Tray Assembly away from the unit e e 9 RETAINING SCREWS FOR PAPER TRAY ASSEMBLY 4 s amp o o SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physica
101. ly 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 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 Ensure that all connectors are firmly home Position the Top Assembly adjacent to the Base Assembly and without straining the ribbon cable plug in the interconnecting cable from the Top Assembly to the Power Supply P12 Note It may be necessary to tilt the Top Assembly for the cable assemblies to reach Carefully position the Top Assembly on the Base Assembly Grasping the two assemblies to ensure that they cannot part carefully turn the unit up side down and replace the six securing screws and washers in the extreme corners and edges of the unit Return the unit to the upright position Functional Check After Assembling the AT 10 The procedure detailed here is a general confidence check in the unit after an internal module or board has been replaced It is not a full functional test but is intended to identify any faults that may be present after the unit has been reassembled If any check fails go to Fault Diagnosis Chapter 4 To carry out the general confidence check proceed as follows 1 Page 4 14 Ensure that
102. ly contains most of the AT 10 electronics and all external connectors The Top Assembly houses the keyboard and the LCD display The two assemblies are moulded to fit together andare secured with captive screws Electrical connection between the two assemblies is achieved with a ribbon cable assembly Because of the plastic construction threaded metal inserts are used for all screw fixings in the unit Page 4 3 Chapter 4 SCHILLER AT 10 ECG and Spirometry Unit Physical Overview amp Module Replacement SERVICE HANDBOOK Issue c April 2002 Base Assembly The base assembly comprises a moulded plastic tray onto which is mounted the following Mains Isolation Transformer Two Lead Acid Batteries e Power Supply PCB MK 8 6 ECG Amplifier PCB MK 7 2 Interface Board MK 8 5 e Microprocessor Board MK 8 1 Program Pack MK 8 11 Thermal Printer e Paper Tray Assembly with Carriage Motor The Microprocessor board and the ECG Amplifier are secured to moulded supports on the bottom of tray The Power Supply is mounted on four spacers above the Microprocessor board and the Interface board and the thermal printer are mounted on the metal paper tray framework Electrical connection between all boards is achieved with ribbon cable assemblies or with flying leads The Mains Connector and Switch assembly is secured to the Back Panel with spring loaded clips The Mains Transformer is secured to the tray with a centre screw Electrical conne
103. mparison voltage at U1B is 1 45V and the generated waveform is at a base level of approximately 17V with an oscillation of 5V Page 2 22 SCHILLER AT 10 ECG and Spirometry Unit Chapter 2 SERVICE HANDBOOK Issue c April 2002 Functional Overview Interface Board Thermal Printer Control INTERFACE BOARD MK8 5 PART UB POWER 424V PRINT CONTROL gt HEAD POWER PRINTHEAD PRINTER DATAAND s TED TRS AEE DATA CONTROL DRIVER V AND FROM CPU CONTROL MCLK MOTOR STEPPER CONTROL MON MOTOR gt STEPPER FROM CPU GONTROL 7 GMOIOR FROM PAPER MARKOPTO __ PAPER MARK IM gt TOCPU WINDOW DETECTOR t The Thermal Printer stepper motor is controlled by stepper motor controller U1 The MON signal from the processor is the enable signal for the controller and the MCLK signal sets the speed 209Hz gives a paper speed of 2 5 mm s 2 09kHz gives a paper speed of 25 mm s The driver circuit incorporates a current sense circuit The current of the motor is approximately 100mA depending on the step rate set The printer data the strobe and the clock signals are buffered by U5 The strobe frequencies TPSO and TPS1 are 2kHz the clock TPCLCK is 4MHz and the latch frequency TPL is 2kHz Because of the high power peaks drawn by the TPH reservoir capacitors on the 24V rail ensure a stable supply to the thermal print
104. mulation signal is only required when the ON key on the keypad cannot be used to switch the power supply on that is when P12 to the Top Assembly is disconnected 1 Connect power to the Power Supply board as follows If the unit is assembled use either mains via the mains transformer or two fully charged batteries connected to the battery connectors If the unit is not assembled connect a power supply to the battery connectors the Power Supply board Connect the positive to pin 1 of plug P25 and the negative to pin 2 of plug P26 Set the Power Supply to 24V SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement Power Supply Board MK 8 6 cont P25 P26 ee PIN 1 PIN 2 2 Using a suitable lead connect GND to Plug P12 pin 25 and hold for 2 seconds The power supply will now be latched on and all generated power supplies can be checked for the correct voltage Note To switch the power supply off connect OV to P1 pin 50 UB Adjustment This adjustment sets the voltage supplied from the switching regulator on the mains power factor controller circuit To adjust this voltage the unit must be assembled and mains connected WARNING LETHAL VOLTAGES ARE PRESENT WHEN CHECKING AND ADJUSTING THE POWER SUPPLY DO NOT LET CONCENTRATION LAPSE EXERCISE GREAT CARE WHEN TAKING MEASUREMENTS To check and adjust UB
105. nsure that the print out is accurate and of good quality Press MAN START and ensure that the print out is accurate and of good quality 6 Press the AUTO START key and wait approximately 10 seconds for the printout to commence Ensure that the print out is accurate and of good quality 7 Press the PATIENT DATA key and systematically press the keys QWERTY UIOP gt ENTER 1234567890 Ensure that the entered data is correctly presented on the screen as entered Press lt ESC gt to exit the patient data display 8 Press the BEGIN key and ensure that the AT 10 indicates that an exercise test has commenced Press END and PRINT REPORT and ensure that a print out is given Press STOP 9 Enter the required static parameter values and store the values by pressing FNCT 2 5 Note A brief overview of the programmable parameters is provided in Chapter One A full description of the programmable parameters the parameter values and the procedure to set them is provided in the AT 10 Operating Manual 10 If a module has been replaced carry out the checks and tests detailed in the relative Paragraph if not already carried out Switch the unit off and leave connected to the mains supply for 24 hours to fully charge the battery Page 5 2 SCHILLER AT 10 ECG and Spirometry Unit Chapter 5 SERVICE HANDBOOK Issue c April 2002 Functional Checks amp Adjustments Check and Adjustment Procedures cont
106. nts Connector Panels Side Panel The following are located on the side panel 1 9 1 X RS 232C interface for connection of a bicycle with blood pressure measuring device Port 1 X RS 232C interface for connection of an ergometer bicycle or treadmill Port 2 X RS 232C interface for data transfer Port 3 1 X RS 422 interface for data transfer LCD contrast control DC inputs DC2 0 5V cm DC inputs DC1 0 5V cm Connection for SP 20 SP 150 SP 110 or SP 110 R flow sensor for lung function measurements Option Test socket for electrode leads with control light 10 EKG ECG Socket for patient cable Note The socket is CF rated ie fully floating and isolated defibrillation protected suitable for intra cardiac application Page 1 9 Chapter 1 SCHILLER AT 10 ECG and Spirometry Unit Operating Elements SERVICE HANDBOOK Issue c April 2002 Connector Panels cont Back Panel The following connectors are located on the back panel 1 2 3 Page 1 10 Identification Plate Mains Module Connector for external video Exercise stress test connection for analogue ergometers bicycle or treadmill Data I O socket for connection of foot switch QRS trigger treadmill elevation control Potential equalisation ground connection Local a
107. od pressure measuring equipment A portis also available for data transmission to other ECG equipment or to an external computer for data evaluation and storage ERGO connector which provides an analog output to control the speed of a treadmill or the load on a bicycle ergometer analog signal is returned from a treadmill to indicate the current elevation and speed Data I O connector which is used for the following afoot switch input QRS trigger output for BP 200 control signal for treadmill elevation Video connector for connection of an external monochrome VGA standard monitor The digital video signal reflects the current LCD display Spirometry connector for connection of a spirometer SP 20 SP110 SP 150 DC connectors DC1 DC2 which are used for experimental analog input signals Page 2 4 SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 Chapter 2 Functional Overview Brief Description cont ECG Amplifier Board Interface Board LCD Keyboard Buffer Board This board amplifies and carries out some signal processing on the incoming ECG signals To ensure absolute safety of the patient allincoming outgoing data is via opto isolators The Interface board contains the following Paper mark detection circuit Thermal print head data buffers Stepper motor control circuit Control circuit for the paper tray dc motor This board buffers the LCD and keybo
108. on 1 13 Manual Baseline Reset 1 13 System Setup 1 14 Defining Macro Functions 1 14 Save Settings 1 15 ECG Menu 1 16 Filters 1 17 Baseline Filter 1 17 Myogram Filter 1 17 Mains Filter 1 17 Number of Printed Copies 1 18 Lead Sequence 1 19 User programmable Lead Group 1 20 Programmable channels for Printout 1 21 Page 1 1 Chapter 1 SCHILLER AT 10 ECG and Spirometry Unit Operating Elements SERVICE HANDBOOK Issue c April 2002 Introduction The Schiller Cardiovit AT 10 The CARDIOVIT AT 10is a sophisticated compact work station for cardiological diagnosis It has the facility to carry out both resting and exercise ECGs with the test results displayed on the integral LCD and recorded on the built in thermal printer Three RS 232 interfaces and one RS 422 interface are provided for the connection of digitally controlled exercise test equipment blood pressure equipment and for data transmission reception The unit also has facilities for connection of an external video monitor experimental DC inputs and analog controlled exercise equipment With ECG program options the AT 10 can be upgraded to provide ECG interpretation exercise test evaluation pacemaker measurement and Frank vector loops A Spirometry option enables Spirometry tests to be performed and pulmonary function diagnosis to be carried out The AT 10 can also be connected to the Schiller PC based data management program designated SEMA 200 for the valid
109. on of all the software controlled peripherals in the AT 10 These are as follows DSP the software version of the digital signal processor the Program Pack EKG the software version of the single chip processor on the ECG Amplifier Board COMM the software version of the communications controller on the Processor Board STO the software version of the optional disk controller Below the software version details is the options line This details the options that are installed These are as follows EXEC analysis program for exercise ECGs SPI Spirometry LAPO Late Potential RES Lung Resistance Pulmonary Functiuon Test The number below and to the right of the Copyright notice is a counter of the number of unauthorized attempts that have been made to incorporate extra options to the unit Important only 9 attempts are allowed and if this figure exceeds 9 no more upgrades are possible The number immediately below the unauthorized attempts counter is the system serial number The options on the bottom of the screen are the software updates that can be incorporated into the unit when the correct code is entered To incorporate any of these software options the code must be entered the option selected with the lt gt and lt gt keys and the ENTER key pressed The code can be purchased from Schiller AG through your local dealer LP Late poten
110. onitors the ac feedback via C24 and dc feedback via R47 to control the switching oscillator U5B C17 A gate booster for the power FETs is provided by U4 and associated components Secondary windings of T2 provide voltages of 13V and 25V These are used by linear voltage regulators to produce the regulated 12V and 18V supplies respectively The power supply distribution is given on the following table POWER SUPPLY DISTRIBUTION Power Supplies Boards dd Mega UB Processor Board 3 3 3 3 LCD Keyboard Buffer 3 3 3 3 ECG Amplifier 3 3 Interface Board 3 3 Battery Controller The battery controller circuit measures the charge discharge current of the battery to enable the CPU to calculate the capacity of the battery The battery controller circuit also controls the battery LED to give a visual indication when the battery is charging and when the unitis using battery power The negative side of the battery is connected to a current sense circuit Operational amplifier U15B gives an indication to the counter of the current direction ie charging or discharging Operational amplifiers U15C and 15 formacurrentrectification and measurement circuit the output of which is fed to a current frequency converter circuit The current frequency converter provides a frequency output that is directly proportional to the battery charge or discharge current The output of the current frequenc
111. output from the CPU to the ECG amplifier via opto isolators SP Spirometry control and data signals SRAM Static RAM memory STRB1 2 Timing signals for printer control SYSEN System enable active when the program pack is inserted The CPU will not work if this signal is not active TGATE Gate pulse for programmable timer This signal sets the TPDUR signal TM Thermal printer temperature dc voltage from the print head pulse width modulation of signal TPTH TPC Thermal printer clock This is not a continuous clock signal but is active when loading a line of printer data into shift registers TPCLK Thermal printer clock TPD Thermal printer data serial data for the printer 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 5 0 amp 1 Thermal Printer Strobe master timing strobe enable signal TPTH Thermal Printer temperature dc voltage from the print head to ADC approximately 3 7V at room temperature TS Temperature sense from battery TXD Outgoing serial data Page 8 6 SCHILLER AT 10 ECG and Spirometry Unit Chapter 8 SERVICE HANDBOOK Issue c April 2002 Glossa
112. ply board and remove the Microprocessor Board The Program Pack is mounted in slides on the Microprocessor board and connects directly with it Removal and replacement instructions for the Program Pack are provided in Paragraph 8 Microprocessor Board Replacement To replace the Microprocessor board proceed as follows 1 Position the Microprocessor board in the Base Assembly and secure with the ten securing Screws Reconnect the following connectors to the Microprocessor board P4 A and B to the ERGO and DATA connectors on the back panel P6 to the ECG Amplifier P2 to the RS connectors on the Back Panel P11 to the Beeper Connector GND Page 4 27 Chapter 4 Physical Overview amp Module Replacement SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 Microprocessor Board cont 3 Slide in and secure the Program Pack as detailed below Replace the Paper Tray Assembly as detailed above Replace the Power Supply board as detailed above Replace the Top Assembly Checks and Tests After Microprocessor Board Replacement Page 4 26 When the unit is reassembled after Microprocessor board replacement the functional check detailed on page 14 must be carried out to ensure the integrity of the assembled unit The capacity of the battery is calculated and stored by the processor for reference To recalculate and store the correct battery capacity proceed as follows 1 2
113. printer check enter the following key sequence lt ECG gt 6 Electrode test lt P gt FAULTY PIXEL A print out of a series of diagonal lines will be given Carefully examine the print out 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 print out for evenness of print If a faulty pixel is detected the printer must be replaced If the print out is uneven for example darker at the top than the bottom it indicates that the printer alignment is not correct If the print out is too faint or too dark check that the correct resistance is entered in memory as detailed in Paragraph 4 3 1 Printer Resistance Check that the correct resistance of the printer is entered in the AT 10 memory as follows Note The printer resistance will be found on a label attached to the printer 1 Enter the following key sequence lt ECG gt lt 6 gt Electrode test lt ENTER gt lt ENTER gt 2 R TPH is the resistance of the printer To enter a new resistance value press lt gt The first figure of the resistance value is highlighted and the correct resistance value can be entered When the correct resistance value has been entered press ENTER to save the setting Note that the AT 10 will only accept a resistance range of between 1000 and 1800 Ohms Page 5 6 SCHILLER AT 10 ECG and Spirometry Unit Chapter 5 SERVICE HANDBOOK Issue c April 2
114. put The test transmission test reception options enables a test sequence to be generated and received Use these test options to ensure that the receiving and transmitting units can communicate and that the cable assemblies connectors etc between the communicating units are good The test message generated is a string of all ASCII characters ABCD 1234 abcd etc When the test transmission reception option is selected the string of characters sent by the transmitting unit are displayed on the LCD in the receiving unit In the transmitting unit a message is displayed indicating that a test transmission is in progress To perform these tests you will need a second AT 10 unit or the AT 10 RS 232 3 interface has to be connected to an active terminal for example the Hyperterminal which is available under Windows 95 The following equipment is needed A personal computer PC with Windows 95 Hyperterminal installed An RS 232 cable assembly Art No 2 310 159 for connecting the RS 232 3 interface on the AT 10 with the COM port of the PC This assembly consists of a cable Art No 2 310 094 and an adapter DB 9 DB 25 Art No 2 100 552 1 Start from Windows 95 desktop Click on START Select Programs Accessories Hyperterminal File Edit View Help E e Hwyperrm MCI Mail E KE objectis plus 2 hidde 382KB 2 Double click on Hypertrm exe En
115. re a good adhesion surface 2 Position the LCD in the casing and thread the ribbon cable and the power cable through the aperture in the Top Assembly casing 3 Join the connectors at the back of the LCD and carefully tape to the LCD 4 Using a flat bladed knife peel off the protective backing from the two sided tape on the LCD and secure the LCD Assembly in the LCD recess Page 4 40 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement LCD cont 5 Taking care not to touch the plastic screen position the cover in the LCD bottom hinges and secure with the three retaining screws at the top Replace the LCD stops in the screw recesses 6 Secure the contrast control with the two retaining screws 7 Replace the connectors to the LCD Keyboard Buffer and secure the cable to the housing with the cable clips Secure the ribbon cable with retaining tape Checks after LCD Replacement 1 After assembly connect mains to the unit and switch on Ensure that the mains LED lights 2 Switch the unit on and ensure that the LCD lights and that straight line traces are displayed for the selected leads Ensure that the information box in the top right hand corner of the display is clearly defined and that all characters are correctly formed 3 Enter the patient data screen by pressing PATIENT DATA and systematically press each of the keyboard charact
116. rea network Connector Option SCHILLER AT 10 ECG and Spirometry Unit Chapter 1 SERVICE HANDBOOK Issue c April 2002 Operating Elements Connector Panels cont Mains Panel The following are located on the mains panel 1 Mains fuse 200 mA slow and voltage selector 2 Mains connection 3 Voltage indicator mains 4 Power on off switch Page 1 11 Chapter 1 SCHILLER AT 10 ECG and Spirometry Unit Operating Elements SERVICE HANDBOOK Issue c April 2002 Liquid Crystal Display The liquid crystal display LCD performs both as a real time monitor and as an alphanumeric display for menu selection data input and the provision of important information The display can be folded down when not in use The contrast can be adjusted by means ofthe LCD control located on the side panel of the unit A typical display of an ECG recording with patient simulator connected is as follows 6 0 Tu 14 93 06 52 39 HR min RESTING ECG fa 2 Wi Ve us 44 U5 U6 1 0 05 150 z5mm s i mm mt CHANN I II III Depending on the function the displayed information will vary but the screen is normally divided into three general area as follows e The top of the screen gives status and operating information These are permanently displayed e The central part of the screen is taken up with the measured wa
117. ribed within at any time without obligation to notify any person of such revision or change Trademarks SCHILLER and AT 10 are registered trademarks of SCHILLER AG All trademarks are the property of their owners Copyright Notice Copyright 1998 by SCHILLER AG All rights reserved You may not reproduce transmit transcribe store a retrieval system or translate into any language in any form or by any means electronic mechanical magnetic optical chemical manual or otherwise any part of this publication without express written permission of SCHILLER AG Terms of Warranty The SCHILLER AT 10 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 the unit and approved attached equipment is used in accordance with the manufacturers instructions THER
118. rom the UB supply Q7 is latched on by Q9 which is switched on by the DIR IN signal high When the tray has returned the DIR IN signal goes to ground which switches Q9 and Q7 off This cuts the Uop rail and switches off the power supply Note that when the AT 10 is switched on the power supply remains on via Q9 held on from Vcc Uop is regulated by U4C to generate the 5V supply for the paper carriage motor control circuit 5Vpd Extend Paper Tray The 5Vpd voltage initially sets a delay and timing circuit formed by U6C U6D and associated components This sets the ENABLE and INIT signals to flip flops U7A and U7B so that the circuit is in a known state Pressing the REPLACE PAPER key sets the EJECT signal to the flip flops via Q8 The flip flops enable the motor control chip U8 and set the direction of the 24V dual polarity motor GO IN GO OUT signals The motor controller incorporates an H bridge current sense circuit to detect when the paper tray is fully extended When the paper tray is fully extended the current increases the motor controller detects this and sets the sense line which via comparator U4D is fed back via a delay circuit resets the flip flops and stops the motor A delay circuit C34 prevents the motor being stopped prematurely during the power surge when the motor is initially activated Retract Paper Tray When the paper tray is extended pressing the REPLACE PAPER key switches off transistor Q8 and activ
119. ry Acronyms HPOFF Off control signal Logic 1 keeps the unit switched on Logic 0 U1 2 3 4 UB CAS DS U UD1 UD2 U U OE USRAM UP UWE U UBU UD ULCD US VSYNC WPO and WP1 XDO XD3 XSCL YD YDIS ZEROSET switches the unit off Note that the unit is initially switched on directly from the ON key on the keyboard Upper LCD data Battery voltage Upper column address strobe for dynamic RAM Upper data strobe used for generating UOE and UWE Upper Data Strobe used on the SCHILLER gate array Upper output enable for static RAM Voltage rectified from the mains input and regulated to approximately 15 V Upper Write Enable for static RAM Unregulated dc supply from mains approximately 30 V Back up voltage for the real time clock and static RAM Unswitched regulated dc voltage used as power source for the switched supply US The voltage is 13 5V when mains is connected or battery voltage when mains is not connected When mains is connected this supply charges the battery Contrast voltage to LCD Switched dc voltage of 13 5V when mains is connected or battery voltage when working from the battery Input voltage for all PSUs on the power supply board 5 V Valid memory address Valid peripheral address Vertical synchronisation video VGA output ECG In the serial multiplexed ECG serial data to the CPU sent over the optical
120. software option screen by pressing the key sequence lt ECG gt 6 Electrode test lt gt period Note The actual key sequence may change slightly for different software versions The software version and the installed options are displayed on the LCD as follows CARDIOVIT AT 10 V 4 29 17 11 1997 DSP 1 4 EKG 1 2 COMM 0 1 STO OPTIONS C EXEC SPI LAPO PM RES COPYRIGHT SCHILLER AG CH 6340 BAAR SWITZERLAND 3 select 1 resting ECG 5 2 exercise ECG 6 7 PFT 4 The top line gives the equipment name and the overall system software version of the unit that is the software version of the EPROMs in the Program Pack This is followed by a combination of characters to indicate the type of software or basic options that is installed These are as follows C Interpretation Program Frank Vector Loops Standard M Measurement The measurement program is integral to the interpretation program thus when the interpretation program is installed by default the measurement program is also installed Full details of all the software versions are given in the AT 10 Operating Handbook Page 5 21 Chapter 5 Functional Checks amp Adjustments SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 Software and Options cont Page 5 22 The second and third line give the software versi
121. solution 2 5 uV min dynamic range 16 mV max electrode potential 300 mV frequency response 0 to 350Hz 3 dB common mode rejection gt 100dB 50 or 60 Hz input impedance gt 100 MOhm pacemaker detection measurement detection voltage range ImV to 4500mV measurement duration range 0 1 to 5ms Page 7 3 Chapter 7 Technical Data SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 Connectors ERGO Connector Input impedance Pin Connections Data I O Connector TTL logic level Pin Connections Page 7 4 GND 100 kOhm Pin 1 RPM Input 100 RPM V Pin 2 GND Pin 4 Load input 100 W V Pin 5 Load output 100 W V 2 5 e e Pd 3 7 5 Vdc Note max non destructive voltage 15 Vdc or 10 Vdc 2 5 kV static discharge 1 QRS trigger Pin2 GND Pin 3 footswitch contact to GND START Pin 4 TM DN Pin 5 TM UP SCHILLER AT 10 ECG and Spirometry Unit Chapter 7 SERVICE HANDBOOK Issue c April 2002 Technical Data Connectors cont Video Connector Type D sub 15 pole High density female Resolution Input signals 640 x 480 dots horizontal sync TTL positive vertical sync TTL negative video 0 to 0 7V Scanning frequency horizont
122. splay speed BEE Myogram filter on off mm s 25 or 50 mms 1 150 Hz off T MONITOR Selection of display sensitivity Imv Manual 1 mV pulse mm mV normal or half amplitude Page 1 7 Chapter 1 Operating Elements SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 The Keyboard cont Exercise Function Keys EXERCISE PROTOCOL SYMPTOMS PRINT PRINT RES END REPORT RHYTHM HOLD NEXT SPEED GRADE STAGE STAGE LOAD PRINT EXERCISE Select exercise test menu RHYTHM HOLD PROTOCOL Display select protocol STAGE SYMPTOMS Manual input of symptoms STAGE BEGIN Start exercise test GRADE END Stop load SPEED LOAD PRINT REPORT Print out final report NIBP Print out rhythm lead Hold current load stage Initiate next load stage Increase decrease treadmill elevation Increase decrease speed treadmill or load bicycle Select menu for non invasive blood pressure measurement The grade increases when pressed in conjunction with the YES key and decreases when pressed in conjunction with the NO key The Speed Load increases when pressed in conjunction with the YES key and decreases when pressed in conjunction with the NO key Page 1 8 SCHILLER AT 10 ECG and Spirometry Unit Chapter 1 SERVICE HANDBOOK Issue c April 2002 Operating Eleme
123. sue c April 2002 Spare Parts Dedicated Test Equipment and special Tools PART NUMBER RS TEST CABLE ASSEMBLY 3 WAY CONNECTORS 2 310042 DESCRIPTION STANDARD TOOL 2MM HEXAGONAL KEY FOR THE REMOVAL AVAILABLE ON REPLACEMENT OF TIIE PROGRAM PACK THE MARKET SCHILLER NUMBER 4 950074 HEXAGONAL CROSS BLADED SCREWDRIVER USED FOR MANUFACTURED THE REMOVAL AND REPLACEMENT OF THE PRINT HEAD BY WERA NUMBER WERA 367 TX 210180 Page 6 8 SCHILLER AT 10 ECG and Spirometry Unit Chapter 7 SERVICE HANDBOOK Issue c April 2002 Technical Data Chapter 7 Technical Data Contents General Technical Data 7 2 Connectors 7 4 ERGO Connector 7 4 Data I O Connector 7 4 Video Connector 7 5 Experimental Input Connectors DC1 DC2 7 5 RS 232 V24 Serial Interface Interface numbers 1 2 and 3 7 5 RS 422 Serial Interface 7 6 Pulmonary Function SP 110 7 7 Accessories for Pulmonary Function Testing 7 7 Page 7 1 Chapter 7 SCHILLER AT 10 ECG and Spirometry Unit Technical Data SERVICE HANDBOOK Issue c April 2002 General Technical Data Dimensions 1 w h Weight Power supply requirements Power consumption Battery Printing process Paper speed Sensitivities Recording tracks Chart paper Liquid crystal display Frequency range of the digital recorder Test socket for patient cable Patient input Patient leakage current Safety standard Protection class Environmental conditions
124. t the ECG Settings Further Settings menu option and then select Programmable Channels 3 Press key 3 several times to select the required number of channels ie 4 5 or 7 This setting is particularly useful when for example additional Doppler or Phono waveforms are to be recorded through the experimental inputs Note Selection of the number of channels ie 3 4 or 6 is performed by pressing the PRINTER CHANNEL key and the current selection is indicated at the bottom of the screen Page 1 21 Chapter 1 SCHILLER AT 10 ECG and Spirometry Unit Operating Elements SERVICE HANDBOOK Issue c April 2002 Page 1 22 SCHILLER AT 10 ECG and Spirometry Unit SERVICE HANDBOOK Issue c April 2002 Chapter 2 Functional Overview Chapter 2 Functional Overview Contents Block Diagram 2 3 Brief Description 2 4 Overall Functional Description 2 7 Power Supply 2 7 Processor and Memory 2 7 ECG 2 7 Keyboard 2 8 Power Supply 2 11 On Off Control and Low Battery Voltage Monitoring 2 Hf Battery Controller 2 12 Processor Board 2 15 CPU 2 15 Program Pack 2 15 Memory 2 15 Communications Controller 2 16 Stress Analog Input Output 2 17 Thermal Print Head Controller 2 17 Programmable Printer Timer and Beeper 2 17 Power On Reset 2 16 ECG Amplifier 2 20 ECG Isolated Power Supplies 2 20 Pacemaker Trigger 2 21 Cable Tester 2 22 Interface Board 2 23 Thermal Printer Control 2 23 Paper Carriage Control 2 25 Page 2 1 Chapter 2
125. t the unit has to be assembled to check the power supplies If the power supplies are checked when the Power Supply is connected to the Processor board however a more accurate measurement may be achieved Test measuring points are provided on the Power Supply board for measurement of all power rails Individual adjustment is not possible for any of the voltage rails except UB from which all other supplies are generated and the batteries are charged Page 5 3 Chapter 5 SCHILLER AT 10 ECG and Spirometry Unit Functional Checks amp Adjustments SERVICE HANDBOOK Issue c April 2002 Check and Adjustment Procedures cont P1 TO MICROPROCESSOR P17 GND BAYONET P12 TO LCD KEYBOARD BUFFER CONNECTOR IN TOP ASSEMBLY NOT USED a H Pa we ye ee m d X P27 FROM P20 TO MAINS TRANSFORMER INTERFACE BOARD P25 P26 BATTERY CONNECTORS VRI UB VOLTAGE ADJUSTMENT Page 5 4 SCHILLER AT 10 ECG and Spirometry Unit Chapter 5 SERVICE HANDBOOK Issue c April 2002 Functional Checks amp Adjustments Check and Adjustment Procedures cont WARNING LETHAL VOLTAGES ARE PRESENT WHEN CHECKING AND ADJUSTING THE POWER SUPPLY DO NOT LET CONCENTRATION LAPSE EXERCISE GREAT CARE WHEN TAKING MEASUREMENTS On Signal Simulation A latch circuit exists on the power supply If the Power Supply board is checked in isolation the on signal must be
126. ted at initial switch on After a few seconds the resistor warms the resistance drops and normal power is supplied The voltage switch ensures that the correct primary winding of the isolation transformer is used for the mains voltage applied The transformed ac input is full wave rectified by a bridge rectifier to produce a dc voltage of approximately 22V The rectified voltage is used by a switching regulator and filter circuit to generate the UB supply The switching regulator comprises a power factor controller chip U1 and associated components The switching regulator controls a power MOS FET Q1 which acts as a switch to regulate the current flow in loading coil T1 Thus via diode D4 and output filter C89 C13 etc the voltage of UB is regulated to 27V The pulse width set by U1 is determined by a zero current detection circuit incorporated in U1 tapping from loading coil T1 the feedback on the current sense via Q1 power FET and the voltage feedback from UB via VR1 when mains is connected Q3 is switched on The frequency of the switching can be between 40kHz and 500kHz An overvoltage protection circuit monitors UB when the unit is operating form the mains and cuts the voltage to the power supply if UB exceeds 35V The overvoltage protection circuit is formed by Q30 and associated components and monitors UB via Q3 which is only switched on when mains is connected to the unit When an overvoltage is detected the d
127. ter the name AT 10 for the new connection and click on OK Page 5 11 Chapter 5 SCHILLER AT 10 ECG and Spirometry Unit Functional Checks amp Adjustments SERVICE HANDBOOK Issue c April 2002 RS 232 Transmission Reception Test cont Phone Number 3 Set the direct connection to the proper COM port and click OK 4 Enter the port settings 19200 8 N 1 Hardware and confirm with OK COM P rti AT 10 Properties b detect E 5 You now in the AT 10 Hyperterminal window Click on File and select Properties 6 Goto tab Settings and set Terminal keys Auto detect and 500 buffer lines 7 Click on ASCII Setup Page 5 12 SCHILLER AT 10 ECG and Spirometry Unit Chapter 5 SERVICE HANDBOOK Issue c April 2002 Functional Checks amp Adjustments RS 232 Transmission Reception Test cont ASCII Setup zx r ASCII Sending Send line ends with line feeds Mii alli Line delay o milliseconds Character delay 0 milliseconds r ASCII Receiving Append line feeds to incoming line ends Force incoming data to 7 bit amp SCII lines that exceed terminal width 8 Check the boxes for Send line ends with line feeds Echo typed characters locally and Wrap lines that exceed terminal width Confirm with OK Click once more on OK to get back to the open Hyperterminal window You are now r
128. the correct version is identified by the processing department Additionally if you are returning a faulty module the following information in as much detail as possible will speed repair the exact nature of the fault thecircumstances and function being carried out when the fault occurred IT IS RECOMMENDED THAT RETURNED MODULES ARE SENT BY REGISTERED POST IMPORTANT ALL BOARDS AND STATIC SENSITIVE MODULES MUST BE RETURNED IN A SEALED STATIC SHIELDING BAG NO RESPONSIBILITY CAN BE ACCEPTED FOR MODULES NOT SENT IN THIS WAY The address to send your order is Schiller AG Sales Department Order Processing Altgasse 68 6340 Baar Switzerland Page 6 2 SCHILLER AT 10 ECG and Spirometry Unit Chapter 6 SERVICE HANDBOOK Issue c April 2002 Spare Parts Module Identification Every module has a unique part number The number is either stencilled on the module or printed on an attached label The module numbers are arranged as follows 3 2180 00001 Article Batch Number Number Build Group Issue Ee d 3 2180Aa 00001 mi d Module Number Modification Index When ordering a module only the article number has to be stated without the modification index The Batch number is a manufacturing identification number and need not be stated unless a module is suspected of having a manufacturing fault The article number is divided as follows Build Group Number This
129. tials HRV Heart Rate Variability PM Pacemaker PFT Pulmonary Function Test SCHILLER AT 10 ECG and Spirometry Unit Chapter 5 SERVICE HANDBOOK Issue c April 2002 Functional Checks amp Adjustments Replacing the Flow Sensor Filter Spirometer SP 20 SP 110 SP 150 The filter is the only serviceable item on the flow meter To replace the filter proceed as follows T 2 3 Remove and discard the mouthpiece Remove the rubber adapter by pulling it away from the inner tube Remove the inner tube of the flow sensor by pushing it out of the outer tube in the direction of the red location marks Once the tube has been pushed half way it can be pulled out from the other side Unscrew the two halves of the inner tube and remove and discard the filter Clean and sterilize all parts of the inner tube the rubber adapter and the inside of the outer tube with one of the following products Incidin GG Amocid Lysoformin Alhydex The cable and handle can be wiped with soapy water do not dip into liquid Page 5 23 Chapter 5 SCHILLER AT 10 ECG and Spirometry Unit Functional Checks amp Adjustments SERVICE HANDBOOK Issue c April 2002 Replacing the Flow Sensor Filter cont 7 Insert a new filter into the inner tube so that it sits on the inner lip of the half with the red location mark 8 Carefully screw the two halves of the inner tube together making sure that the filter is not displaced
130. tments SERVICE HANDBOOK Issue c April 2002 Self Test Screen cont The patient must be connected to obtain a meaningful measurement The range of the measurement is between 0 and 255 A high reading means that common mode noise is present and it may be necessary to move the unitto a less noisy environment Sources of noise could include the following bad electrode connection electric light electric motors CRT monitors etc T TPH This is the temperature of the print head heat sink This measurement is used by the CPU to control the printer timing to obtain optimum print The reading given here should be approximately the ambient temperature of the room Note that if the printer has recently been active this reading may be higher than the room temperature SYNC This value is a counter reading of the number of communication failures between the ECG Amplifier and the main CPU since the unit was switched on There should never be any communication failures and this value should be 0 If communication failures are occurring it indicates a problem with the ECG Amplifier board or the Processor board SUBSYNC This counter gives the number of times that re synchronisation of the data subvector has occurred On initial switch on this counter could read 5 to 30 After initial synchronisation this figure should not increase If re synchronisation is occurring check the optical link between the Processor board and the ECG Amplif
131. tors from the Power Supply board and remove the batteries Page 4 20 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement Lead acid Batteries cont Battery Replacement To replace the battery position the battery and connect the leads to the battery connector on the Power Supply Note Red lead is the battery terminal Black lead is the battery terminal Checks and Tests After Battery Replacement Toensurethatthe battery and the battery recharging circuit are functioning after battery replacement proceed as follows 1 Connect mains to the unit and ensure that the green mains and the yellow battery indicators next to the display are lit Charge the battery for approximately 15 hours Ensure that the Battery indicator is extinguished after 15 hours battery fully charged So that the capacity of the newly installed battery is calculated correctly by the processor run the unit on battery power until the battery is fully discharged and the unit switches off Repeat this process two times This ensures that the correct capacity of the battery is registered by the processor The calculated value of the battery capacity can be seen by pressing lt ECG gt lt 6 gt electrode test lt ENTER gt lt ENTER gt The B CAPACITY indication displays the calculated battery capacity See Chapter 5 for further details Program all static settin
132. tup menu is displayed as follows 1 Macro Function 2 Date and Time 3 User Identification 4 Device Configuration 5 Save Settings When the menu is entered the cursor is always located on the first item There are two ways to select a particular menu item as follows press the number indicated to the left or e use the direction keys to move the cursor to the item required and press the ENTER key Most of the options are self explanatory in the set up menu however the macro function and the save setup options are detailed here Defining Macro Functions With the AT 10 you can create your own macro functions and assign them to one of the first six numerical keys on the alphanumeric keyboard Up to 30 keystrokes can be stored for one macro enabling you to call up a particular sub menu or to carry out a particular programming sequence by pressing only two keys Note Before starting to program a macro it is advisable to carry out the sequence making a note of the order of the key strokes for reference In the System Setup menu press key 1 to call up the Macro function input menu To start the programming sequence press key I then the number key which you wish to program and then carry out the required sequence Once the sequence is completed press the 2nd key followed by the lt ESC gt key and storage of the keystroke sequence is confirmed by an audible tone To initiate a programmed Macro sequence
133. uence to give the Macro screen is lt FNCT gt 2 ENTER This requires that the Function key on the keypad is pressed followed by the 2 key followed by the Return or Enter key Page 3 2 SCHILLER AT 10 ECG and Spirometry Unit Chapter 3 SERVICE HANDBOOK Issue c April 2002 Fault Diagnosis Test Equipment The following proprietary and dedicated test equipmentis the minimum that is required to fault find and carry out any board checks and adjustments on the AT 10 The list of proprietary equipment is not comprehensive Recommendations of suitable proprietary test equipment can be obtained from the Schiller Service Department Dedicated Test Equipment RS Test Cable Assembly required for the RS self test In addition to the above a Schiller patient cable Schiller Number 2 400011 is required when carrying out simulated ECG tests Proprietary Test Equipment Tools ECG Emulator eg Phantom 320 e Oscilloscope Digital Multimeter Stabilised Power Supply Standard tool kit with a selection of cross bladed flat bladed and posi drive screwdrivers Pliers and general tools e Soldering Iron e VGA Monitor Indicates Essential Equipment for basic AT 10 fault finding Special Tools Equipment The following table lists all the special tools and equipment that may be required when fault finding or carrying out certain maintenance procedures on the AT 10 PART NUMBER RS TEST CABLE ASSEMBLY 3 WAY C
134. ust be observed The Top Assembly must be removed as detailed above and all external cable assemblies disconnected Tools e Cross bladed screwdriver Parts The part number for the LCD Keyboard Buffer Board MK 8 4 are given in Chapter 6 WARNING HIGH VOLTAGES ARE GENERATED IN THE LCD ENSURE THAT THE MAINS IS DISCONNECTED CAUTION THE LCD KEYBOARD BUFFER BOARD CONTAINS STATIC SENSITIVE CMOS COMPONENTS OBSERVE ANTI STATIC PRECAUTIONS Page 4 36 SCHILLER AT 10 ECG and Spirometry Unit Chapter 4 SERVICE HANDBOOK Issue c April 2002 Physical Overview amp Module Replacement P13 TO LCD BUFFER BOARD P13 TO P12 TO TO LCD CONTRAST KEYBOARD POWER CONTROL SUPPLY TO CONTRAST LCD CONTROL TO Page 4 37 Chapter 4 SCHILLER AT 10 ECG and Spirometry Unit Physical Overview amp Module Replacement SERVICE HANDBOOK Issue c April 2002 LCD Keyboard Buffer MK 8 4 cont LCD Keyboard Buffer Removal To remove the LCD Keyboard Buffer proceed as follows 1 Disconnect all connectors from the board 2 Remove the three retaining screws and gently ease the board away from the case LCD Keyboard Buffer Replacement To replace the LCD Keyboard Buffer board proceed as follows 1 Position the board and secure with the three screws 2 Connect all connectors Checks after Replacement 1 After assembly connect mains to the unit and switch on Ensure that the ma
135. veform ie ECG trace Lung function curve etc with the lead identifications or measurement units on the left hand side e bottom of the screen displays the time interval of the recording indicated in seconds The very bottom line gives from left to right Selected Baseline and Myogram filter settings Speed sensitivity and the number of channels for direct manual print out The leads that are selected for the printout for direct manual print out Page 1 12 SCHILLER AT 10 ECG and Spirometry Unit Chapter 1 SERVICE HANDBOOK Issue c April 2002 Operating Elements Calibration At any time during the ECG recording a 1mV calibration signal can be manually produced by pressing the 1mV key on the keyboard This 1mV square wave signal is indicated both on the display and on the printout Manual Baseline Reset Pressing the manual baseline recentre key resets the displayed traces to the optimal position Use this key to centre the real time ECG traces when drifting occurs Page 1 13 Chapter 1 SCHILLER AT 10 ECG and Spirometry Unit Operating Elements SERVICE HANDBOOK Issue c April 2002 System Setup There are several general settings for the AT 10 Press the lt FNCT gt key to call up the initial menu Two options are presented Option 1 is for entry of the operator information MTA Medical technical Assistant The second menu item is the set up option Press 2 and the System Se
136. y Unit Chapter 2 SERVICE HANDBOOK Issue c April 2002 Functional Overview Processor Board CPU Overall control and coordination of all circuits and all peripherals with the exception of the paper tray carriage motor is by the CPU U46 situated on the Microprocessor Board The CPU used is the 68000 and it works in conjunction with a dedicated gate array IC U47 The main functions of the gate array circuit are as follows To decode the address bus A17 to A23 and generate the chip select CS signals for the memory and the peripherals To generate interrupt priority signals IPLO IPL1 IPL2 for the main processor the highest priority interrupt is 7 the lowest 17 To generate the row address strobe RAS column address strobe CAS and address multiplex control signals for the dynamic RAM To synchronize the clock of the asynchronous ECG input signal Program Pack The Program Pack comprises two EPROM chips and a DSP digital signal processor The DSP is used for real time processing of the ECG signal as follows QRS detection Filtering Myogram Mains Baseline Lead calculation I II etc A 20 MBz oscillator provides the clock input for the DSP Communication between the main CPU and the DSP is via a 16 bit parallel port integral in the DSP The EPROM chips contains the AT 10 software The EPROMs each have 256 or 512 kByte of memory which is addressed by address lines AO to A20 and enabled by the E
137. y converter clocks an up down counter which is used to indicate the charge discharge current and charge discharge time of the battery and thus the actual capacity of the battery Page 2 12 SCHILLER AT 10 ECG and Spirometry Unit Chapter 2 SERVICE HANDBOOK Issue c April 2002 Functional Overview Power Supply cont The frequency of the current frequency converter at a charge or discharge rate of 1A is approxi mately 31 3Hz The counter counts up when the battery is discharging and down when the battery is charging The count is converted to an analog value by D A converter U13 for use by the CPU in determining the charge state of the battery When the battery is fully charged ie counter all 1 the DAC output is OV The counter is preset when the battery is fully charged This is carried out by a comparator U14C which acts as a current sense and goes high when the charging rate of the battery is less than 10mA Via Q23 the PRESET signal goes low and the counter is preset to all 1 s This circuit is also used via Q24 to light the battery LED when the battery is charging Page 2 13 SCHILLER AT 10 ECG and Spirometry Unit Chapter 2 SERVICE HANDBOOK Issue c April 2002 Functional Overview YOLOANNOO 1 ecev Sd LHOd 260 59 1HOd 685 54 L 1HOd 65 54 O I vivd z 3a o943 xo org euonounj 105892011
138. z 95 9 01 23456789 lt gt GABCDEFGHTIKLMNOPORSTUVWEYZ This is the As 232 input test Stop the test by pressing key 7 Leave the RS 232 test window by pressing ESC Error Codes The error codes shown at the bottom of the display have the following interpretations DSR Data set ready BD Break detected FE Frame error OB Overrun error PE Parity error TxE Transmitter empty RxR Receiver ready TxR Transmitter ready Page 5 14 SCHILLER AT 10 ECG and Spirometry Unit Chapter 5 SERVICE HANDBOOK Issue c April 2002 Functional Checks amp Adjustments Interface Board Adjustments One adjustment is possible on the Interface board Paper Mark VR1 This pre set is used to adjust the paper mark detection circuit threshold so that the paper mark is recognised The paper mark is used for calculation of print out commencement position paper detection paper present etc Paper Jammed Indication When the detection circuit does not recognise the paper mark a paper jam error message may be displayed Before carrying the paper mark adjustment procedure ensure that the paper detector window is clean P32 P29 PRINT HEAD 24 TO PHOTO GUARD DATA CABLE SENSOR INTERFACE BOARD MK 8 5 P22 TO TP P4 TO PAPER MOTOR TEST POINT 1 CARRIAGE MOTOR P20 TO VR1 P23 PRINTHEAD UNDER POWER SUPPLY DATA CABLE UNDER Paper Mark Adjustment Set the paper mark threshold
139. z H3 NHOJSNVH L NOLLY IOSI H31H3ANOO 3v od DINVATVO 1HVd OL LV jeuonoung 1ogijdury 594 gt AQva so 59119915 Hd3MOd G31v OSI uatdridiv 993 XNW993 109138 TANNVHO e 0 06 00606000000000000000000000000000000000000000000000000000000000000000909 H3 1H3ANOO 9d Page 2 19 HOLO3NNOO q18vo LNAILWd Chapter 2 SCHILLER AT 10 ECG and Spirometry Unit Functional Overview SERVICE HANDBOOK Issue c April 2002 ECG Amplifier ECG Isolated Power Supplies The DC DC converter circuit produces all the isolated power voltages required by the ECG Amplifier circuit The 12V rail from Power Supply MK 8 6 is applied to isolation transformer U2 via a pulsing circuit The pulsing circuit comprises a 125kHz oscillator divided by two which via Schmitt triggers switches MOS FETs Q3 and Q4 This gives a pulsed 180 phase shifted input on the two primary windings of the isolation transformer The two secondary windings of the isolation transformer produce 28Vpp and 7 5Vpp respectively A Schotky diode and capacitor network produce the 12V 12V and 24V isolated supplies A linear regulator U5 generates the 5V supply from the isolated 12V supply The 5V isolated supply is generated from the 7 5Vpp secondary winding A bridge rectifier produces approximately 7V which is applied to a FET The

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