FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL
Contents
1. 1 6 1 1 4 1 1 1 1 Foot M 3 0005 2 2 Hex Nut M4 SS B H000568 38 2 Hex Skt Cap Hd MAX12LG Screw B H000122 32 4 Hex Skt Cap Hd M3X10LG Screw SS B H000214 33 8 Hex Skt Cap Hd M4X10LG Screw B H000596 34 7 Hex Skt Set Screw M3X3LG SS B H001008 36 4 Hex Skt Set Screw M3X5LG SS B H001009 37 6 Hex Skt Set Screw M3X6LG SS B H001006 39 10 Large Pulley M 3 00019 15 1 Lever Assembly 3 0011 7 1 Lever Knob M 4 0012 8 1 Motor Pulley M 3 0017 1 12 Nylon Spacer 1385016040 B H001010 42 1 Nylon Washer M5 X 1 0 THK B H001004 30 4 Paper Sensor Assembly 3 0069 21 1 3 0009 5 1 4 0007 4 1 Pivot Bar M 4 0032 19 1 Printer Head Lead M 3 0041 22 1 Push Rivet 4 x 6 5 LG 072 5884 B H001005 31 2 Roller M 2 0006 3 1 Roller Pulley M 3 0018 14 1 Screw SLTD Csk Hd M3X6LG SS B H000167 35 1 Side Plate M 3 0015 11 2 FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 27 of 41 Carriage Assembly M 1 0002 cont Description Drawine Part M 1 0002 Quantity Number Item Number Spring Clamp M 3 0016 12 1 Step Motor N 103 546 5540 B E001000 26 1 Tension Pin 1 5X12LG SS B H001007 40 I Thermal Print Head QP128 B E001001 27 1 Timing Belt 71 MXL 0 080 Pitch B M001002 28 1 Timing Belt2. 60 80 10 90 so 0 umay 2212 I nio DSA 29 99 68 XYIN LY S3NY d gt yonan 7 gt Page 35 of 41 Issue 1 Drawing Number 002 05 6 sheet 5 of 7 FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL V MOM CC H3Q0v3H or anaoa 13093 DIS 915 903 SNI 23 ASL eis ooo1 7 zsn ASI NI ODOL 0501 3X3 0204 HOS 9790 200 oianv isn gt zsn Pug Drawing Number 002 06 6 sheet 6 of 7 FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Page 36 of 41 Issue 1 zsn 3022 9zxu m E qowaq isn gt auesn Z io 1 rogo t 2 2 Xa Drawing Number 002 07 6 sheet 7 of 7 FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Page 37 of 41 Issue 1 15V
3. 9 E 8 5 0 5 29 lt 8 2 oo 93 zi 2 w BB 2 3 1 85 55 lt 5 o lt lt as 5 us 8 8 Drawing Number 0260 8203 sheet 1 of 3 FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 38 of 41 ZASI 4190 a p 85H NI 265 QN SH E 1140 78 sin tang NBI SSH m 11811 She mica da ns min T d 8 4 1 8 ess 4558 NBEE zi 3 102 z E 119 21 Page 39 of 41 Issue 1 Drawing Number 0260 8203 sheet 2 of 3 FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL 1750 05 0V1 1 Ovi Drawing Number 0260 8203 sheet 3 of 3 FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 40 of 41 te a 3 a E j 1 EJ i 10 51 PI w i 3 Dis PT DID il ir i A H 1 E FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 oS Page 41 of 41
4. SERIES 21 CARDIOTOCOGRAPH SERVICE MANUAL FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 1 of 41 CONTENTS Page GENERAL INTRODUCTION Introduction Unpacking Safety Abbreviations DESCRIPTION OF THE INSTRUMENT Front Panel Internal Layout Dismantling Instructions Front Panel Associated Items Rear Panel Associated Items CIRCUIT DESCRIPTIONS Introduction Power Supply Ultrasound Circuit Tocodynamometer Circuit Toco Printer Interface Circuit Main Digital PCB Dexdyne PCB Display and Keyboard Circuit Interface ECG and IUP Circuit TEST AND CALIBRATION Introduction Paper Out Sensor Ultrasound Simulation Channel 1 Ultrasound Simulation Channel 2 TOCO Test ECG Simulation Test Intrapartum Models Only IUP Simulation Test Intrapartum Models Only Chart Recorder Alignment Test Trace Inspection Setting up the Monitor Software Options SAFETY TESTS Test Equipment Requirements Procedure FAULT FINDING Digital Display Problems Chart Recorder Problems Ultrasound Problems Electrocardiograph ECG Problems Uterine Activity Problems RECOMMENDED SPARES PARTS LISTS SERVICE INFORMATION FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 2 of 41 GENERAL introduction Introduction The FETATRACK SERIES 21T CARDIOTOCOGRAPH monitor is a sensitive instrument for the measurement and recording of up to two foetal heartbeats at any one time It is designed and manufactured to strict quality cont
5. Front panel recorder aperture Recorder door earth e TEST 6 Earth leakage current normal Operate the NORMAL REVERSE switch the illuminated AP GND switch must be depressed BF only meter reading must be 500 A e TEST 7 Earth leakage current SFC open supply Operate the NORMAL REVERSE switch the illuminated AP GND switch must be depressed BF only meter reading must be 1000 A e TEST 8 Earth leakage current normal FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 21 of 41 Using probe hold against all metal parts listed below Operate NORMAL REVERSE switch The indicated value must be 100 A in each case a All case screws front panel rear panel and cover b Front panel recorder aperture c Recorder door earth e TEST 9 Earth leakage current SFC open ground Using the probe hold against all metal parts listed below Operate NORMAL REVERSE switch The indicated value must be 500 A in each case a All case screws front panel rear panel and cover b Front panel recorder aperture c Recorder door earth e TEST 10 Earth leakage current SFC open supply Using probe hold against all metal parts listed below Operate NORMAL REVERSE switch The indicated value must be 500 A in each case All case screws front panel rear panel and cover Front panel recorder aperture Recorder door earth TEST 11 Patient leakage current normal Operate NORMAL REVERSE and each LEAD
6. Screw M4x12 Pozi C sk Head SS 71531512 56 2 Screw 8 Pozi Pan Head SS 71511308 40 11 Screw M4x10 Pozi Pan Head SS 71511510 41 5 Screw M4x16 Pozi Pan Head SS 71511516 42 4 FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 29 of 41 General Assembly Drawing Number M 1 0002 cont Description Drawing Part M 1 0002 Quantity Number Item Number Screw M3x6 Pozi Pan Head SS 71511306 43 25 Screw 3 12 Pozi Pan Head SS 71511312 44 4 Screw M4x12 Pozi Pan Head SS 71511512 45 2 Screw M2x6 Pozi Pan Head SS 71511106 46 2 Spacer M4 72450004 39 4 Spade Terminal Post 56400250 52 1 Speaker 65400077 25 1 Terminal Post Spade 56400250 52 1 Tilting Feet 73000211 28 2 Transducer 21 Ultrasound M 1 0059 12 1 Transducer 21 Ultrasound 02150003 14 1 Transducer 21T Uterine Activity M 1 0082 13 1 Washer M3 Nylon 71596032 47 4 Washer 3 SS 71261300 48 24 Washer M4 SS 71261500 55 14 Washer Shakeproof M3 SS 71511300 50 9 Washer Shakeproof M4 SS 71571500 49 16 FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 30 of 41 Service information The form illustrated below is designed to record modification details or service information as it Is released from the manufacturer ECN RefN Details Effective Date Drawing Number 002 01 6 sheet 1 of 7 FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE M
7. cause multiple increments Adjust the volume to minimum by depressing the volume DOWN pushbutton In both situations the LCD will display a volume bar graph as the volume changes Reset the volume to maximum This signal should be loud and free from any interference or distortion and should follow the volume UP DOWN action Observe that the FHR Cardiol display showing the simulated rate and that the heart shaped foetal pulse LED flashes in time with the audible signal The foetal pulse LED will change colour with respect to the signal quality of the simulation The simulated rate should be such that the pulse LED flashes green Ensure the simulation is continuous Reduce the simulated rate and observe that the FHR display follows the simulation similarly increase the rate and observe that the display follows the increased rate Check the tracing on the chart printout this should be continuous and free from any breaks FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 17 of 41 Randomly depress the event marker and observe half arrows are printed just below the 60 BPM line of the Heart Rate chart The simulation procedure should be repeated for at least one minute Check that the data block printed between the graphs displays the correct time date chart speed and mode of operation U S EXT T OFF B OFF Ultrasound Simulation Channel 2 Repeat the Ultrasound Simulation Channel 1 for the CARDIO 2 ultrasound blue
8. channel Ensure correct audio output is selected TOCO Test Place the Toco transducer face upwards on the work surface Press the UA zero pushbutton to establish the zero baseline there may be a need to go to engineering set up to change Place a 100 gm test weight onto the centre of the transducer and observe that the Toco trace on the chart printout increases to 20 units 3 units The LCD will also display the corresponding value Remove the weight the trace should return to its resting value of zero within 20 seconds Press and hold down the printer control pushbutton to form feed and stop the printer Remove the Toco and Ultrasound transducers from the instrument Wipe the Ultrasound transducer clean ensure that the face is free from all transmission gel before it is placed aside ECG Simulation Test Intrapartum Models Only Note If the IUP Simulation Test Intrapartum models only is to be carried out after this test the IUP transducer should be connected to the instrument before commencement of the ECG simulation test This is to allow for the settling time required Using the Wakeling Instruments ECG simulator model model number 520 connect it to the front panel CARDIO 2 socket via the interface lead Set the rate to 120 BPM and select the audio output to HR2 audio Set up the test Sphygmomanometer to accept the test IUP transducer Connect the transducer to the unit s UA socket via the interface cable assembl
9. Limits Pass Fail Rework Pass Fail 1 2 200 260 3 1 Mohm 4 10 Mohm 5a 0 2 ohm 5b 0 2 ohm 5c 0 2 ohm 6 500A 7 1000 A 8a 100 A 8b 100 A 8c 100 A 9a 500A 9b 500A 9c 500A 10a 500A 10b 500A 10c 500A 11 100A 12 500A 13 500A 14 10 15 500 16 500 17 5000 18 5000 FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 23 of 41 Fault Finding This section 18 intended as an aid to fault finding and should be used in conjunction with the relevant circuit diagrams at the back of this manual Warning Recalibration and safety checks MUST be carried out after any repair Digital Display Problems Symptom Suspect Area Check Power on but no displayMains fuses Fault on XP power supply Main processor card not running Ribbon interface from digital p c b to display p c b Check fuses Check DC outputs First check ribbon cable between Digital and display p c b s If OK see if any front panel switches have any effect If not processor probably not running Connections at J4 on digital p c b and on display p c b Segment strobe and energise LED signals pulses present on J4 POWER ON LED is illuminated but nothing else Fault on XP power supply Main processor card not running Ribbon interface from digital p c b to display p c b Check DC outputs First check ribbon cable between Digital and display p c b s If OK see if any front panel switches have any effect If not processor probably
10. an AD converter on the main Digital p c b where it is sampled such that the control software can derive correlated heart rate Reference circuit diagram 02608203 sheet 1 the differential signal from either a foetal or maternal ECG is placed across pins PL1 and PL3 the isolated input to the ECG card Two buffer amplifiers U14 and U15 are configured as low gain approximately 2 to the differential signal amplifiers and are primarily in the circuit to minimise the effect of patient electrode offset potentials The differential signal 18 then fed to a high gain 1000 instrumentation amplifier U11 Any d c offsets are minimised at the output of U11 by feeding back via U10 a control signal that is inversely proportional to the magnitude of the d c output The signal is then passed from the isolated to non isolated circuit 02608203 sheet 3 refers via the linear opto isolation circuits of U9 U6 and associated components The signal is then passed through a standard notch filter which is centred on a frequency of 50 Hz in order to take out any mains hum derived signal From here the signal is passed through an AGC stage where a digital potentiometer U1 is controlled by the control software on the Dexdyne p c b After further signal conditioning and rectification the signal is passed via pin 10 on PL2 to the main Digital p c b for sampling Other circuits shown on 02608203 sheet 1 shows the power supply unit PSU and decoupling components T
11. item that should be changed if suspected as faulty Display and Keyboard Circuit Interface The Display Keyboard interface p c b data is transferred from the main Digital p c b via a 20 way ribbon cable and associated connector plugged into J4 An LCD display module proprietary item is connected to the Display Keyboard p c b via a specialised 14 way ribbon type cable The Display Keyboard p c b has an interface for six pushbuttons the conditions of which are read by the Dexdyne p c b as an I O FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 15 of 41 mapped peripheral Also on the p c b are the LED s that define the state of the foetal heart correlation Red none or poor correlation e Green indicating a good heart signal being correlated Note The LED s are again part of the I O map The LCD module is driven via a logic interface on the Display Keyboard interface p c b The control and data registers of the module are accessed via the I O mapping of the Dexdyne p c b ECG and IUP Circuit Circuit diagrams 02608203 sheets 13 refer The ECG p c b has two separate circuits and is located on the right hand side of the Digital p c b It is vertically connected to the Digital p c b via J3 a 32 way DIN 41612 type connector The majority of the circuitry on this p c b is for amplification and isolation of the electrocardiogram signal derived across the heart muscle The output signal from this p c b is fed via
12. main units of the instrument are Item Description Front Panel ECG PCB Display PCB LCD Module Printer Rear Panel Power Supply DEXDYNE PCB Digital PCB Front Panel Associated Items Items 25 are associated with the Front Panel for dismantling requirements the removal of which will allow direct removal of any of these stated items without physical effect on any of the others Although the Digital p c b is mainly associated with the Rear Panel certain considerations of the Front Panel will be necessary when requiring to dismantle fully access this p c b This will be dealt with under Rear Panel Associated Items Separation of the Front Panel from the base is affected by removal of Connector at J23 on Digital p c b linked to UA socket e Connector at J24 on Digital p c b linked to Cardio 1 UA and Cardio 2 sockets e Connector at 14 on Digital p c b linked to Display p c b Connector at JM20 on Digital p c b linked to Cardio 1 socket Connector at JM21 on Digital p c b linked to Cardio 2 socket Connector at J14 Digital p c b linked to Display p c b e Connector on ECG p c b linked to Cardio 2 socket Removal of Rear Panel may now be carried out by unscrewing the three M3 Base holding screws Note The following dismantling procedures assume that the front panel has been removed as detailed above Dismantling will now only involve the associated fixings except for the earth connectio
13. not running Connections at J4 on digital p c b and on display p c b Segment strobe and energise LED signals pulses present on J4 Chart Recorder Problems Symptom Suspect Area Check Recorder does not feed paper but speed display illuminates Cables Printer power supply Motor control Connections of interface cables Printhead voltage Motor strobe signals Recorder feeds paper but does not print Printhead interface Printhead alignment Printhead pressure Data and strobe pulses Printhead fixing screws If loose printhead will misalign Re align using test trace ensure screw are tight Loose fixing screws in spring mounting bars broken spring Misalignment of trace on chart paper Printhead lateral alignment Releasing the two MA screws at rear of printhead mounting bracket allows movement laterally re tighten screws after adjustment Ultrasound Problems Symptom Suspect Area Check Ultrasound does not function Transducer Other areas Replace transducer Audio select switch is selecting correct channel Wiring from main Digital p c b to front connector both co axial for ultrasound and digital wires for mode detect Ultrasound transmit oscillator output from Digital p c b Ultrasound signals OK but no audio input signal gives a correlated output indication Loudspeaker connections Controls Check wires have not become detached from loudspeaker terminals Volume control set low Incorrect audio channel selection Electrocardiograph ECG Problems Symptom Suspec
14. paper tray close the recorder door and switch the recorder ON by depressing the printer control pushbutton on the front panel Open the recorder door and remove the chart paper Observe the LCD display indicating periodically that the chart recorder has NO paper displaying Paper Out Replace the chart paper and close the recorder door Press the printer control pushbutton to re start the recorder The paper will advance at fast speed for a short period and then continue at the selected rate as chosen in the set up mode To change the chart recorder speed just push the printer control pushbutton momentarily Note Until the printer control pushbutton is pressed Paper Out indication will continue Ultrasound Simulation Channel 1 Ensure that the volume control switch has been operated to select Heart Rate 1 audio output The central front panel pushbutton when pressed will initiate a display message on the LCD either HR1 Audio Select or HR2 Audio Select Place a small amount of transmission gel into the palm of your hand and using the CARDIO 1 pink ultrasound transducer place the hand over the area and gently stroke the back of your hand at a rate of approximately twice per second Whilst stroking the back of your hand check that an output signal is coming from the loudspeaker Adjust the volume to maximum by depressing the volume UP pushbutton Momentary action will cause a single increment holding down the pushbutton will
15. selector switch meter reading must be 500 A in each case e TEST 12 Patient leakage current SFC open ground Operate NORMAL REVERSE and each LEAD selector switch meter reading must be 500 A in each case e TEST 13 Patient leakage current SFC open supply Operate NORMAL REVERSE and each LEAD selector switch meter reading must be 500 A in each case e TEST 14 Patient auxiliary current normal Operate NORMAL REVERSE and each LEAD selector switch meter reading must be 500 A in each case e TEST 15 Patient auxiliary current SFC open ground Operate NORMAL REVERSE and each LEAD selector switch meter reading must be 500 A in each case e TEST 16 Patient auxiliary current open supply Operate NORMAL REVERSE and each LEAD selector switch meter reading must be 500 A in each case e TEST 17 Mains applied part normal phase type BF only Depress TEST and operate NORMAL REVERSE switch meter reading must be 5000 A in each case TEST 18 Mains applied part reverse phase type BF only Depress TEST and operate NORMAL REVERSE switch meter reading must be 5000 A in each case TESTS COMPLETE SELECT TEST 1 AND SWITCH OFF BOTH THE SAFETY TESTER AND INSTRUMENT UNDER TEST THE COMPLETED SAFETY RECORD SHEET SHOULD BE KEPT WITH THE 21T INSTRUMENT e G FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 22 of 41 Example of Test Form TR0007 Contents Model Unit Serial Number Operator Date Test Test
16. 1 VDC drive to the transducer e Pin2isthe 5 1 VDC drive to the transducer e Pin 3 is the return signal from the transducer The supply voltages on pin 1 and pin2 are derived from a 5 1V zener diode before being buffered and applied via 6 pin 1 and inverted via U36B pin2 The input signal is amplified at d c with a low pass filter action to remove unwanted high frequency noise The cut off point of the filter is 0 8 Hz The excited bridge circuit within the Toco transducer returns a DC voltage on pin 3 that is proportional to the pressure places across the membrane of the transducer Printer Interface Circuit Circuit diagram 002 03 6 refers The printer interface circuit is incorporated on the main Digital p c b The circuit can be considered as two areas e The first area consists of the thermal print head which is driven from the outputs of header J5 15 way Harwin The thermal print head is a serially loaded device that derives its timing signals from a combination of programmable Gate Array Logic GAL components U12 and U13 These have been programmed to perform a set functionality for a given set of input conditions The start of each cycle is initiated via the PC104 bus interface The data for the print head is derived from parallel loaded shift register U19 loaded from the PC104 interface the output of which is synchronised by the timing of the two GAL s e The second area consists of the motor drive for a 2 phase
17. 122 MXL 0 080 Pitch B M001003 29 1 Plate 3 0013 10 1 Washer 3 SS B H0001447 41 10 Electrical Assembly Drawing Number M 1 0057 Description Drawing Part M 1 0057 Quantity Number Item Number Cable AssemblyDisplay PCB to J14 M 4 0067 7 1 Cable AssemblyLow Voltage Supply M 3 0061 1 1 Cable AssemblyMains Supply M 3 0072 11 1 Cable AssemblyUA Transducer Socket to ECG M 4 0063 3 1 Connector Cable AssemblyUA Transducer Socket to J24 M 4 0064 4 1 Cable AssemblyUA Transducer Socket to M 4 0065 5 2 JM20 21 Cable AssemblyUA Transducer Socket to J23 M 4 0066 6 1 Cable AssemblyPrinter M 3 0041 14 1 Cable AssemblyRibbon 60 way M 4 0070 9 1 Cable AssemblyRibbon 20 way M 4 0071 10 1 Capacitor0 0047 FFarnell 106767 B E001043 21 3 Fan Motor Assembly G 3 4046 26 1 Fused Appliance Filter Inlet Schaffner B E000377 45 1 Lead Speaker to J22 M 4 0062 2 1 Link JM10 M 4 0068 8 1 Nortronic Flexistrip 14 way 30mm LG 70400014 25 1 PCB Mounting HeaderFarnell 460620 60 way B E001045 22 1 Transition Connector 60 way RS 1927726 B E001046 23 1 Transition Suppressor SA 5 0 RS 1927726 B E001047 24 1 Tubular Ferrite SleeveFarnell 559532 B E001043 20 2 FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 28 of 41 General Assembly Drawing Number 1 0002 Description Dr
18. 60 way ribbon connector The main printed circuit board p c b itself has a 32 way female DIN connector where a further ECG p c b may be plugged in to provide both ECG and IUP functionality The main p c b also has several other interfaces including e Thermal printer drive Harwin J5 J6 e Two channels of ultrasound Harwin JM20 JM21 e Digital input output for defining front panel connector status Harwin J24 e LCD and front panel switch interface 20 way ribbon cable e Audio output Harwin J22 interface 3 way Harwin crimp terminal Auxiliary D type connector including RS232 interface and external tape input e Event mark jack plug input e Event mark Harwin J14 output e Main power supply connector 8 way Molex Power Supply The main power supply of the 21T is a medically approved UL544 anIEC 601 VDE 0750 switching unit manufactured by XP The unit designated NFS 110 7902P has a universal input voltage range of 85 264 volts r m s and input frequency range of 47 440 Hz The unit is rated at 110 watts supplying quad outputs with the following characteristics 5 volts 5 amps 12 volts 2 amps 12 volts 2 amps 24 volts 2 5 amps The power supply is a line replaceable unit and if suspected of failure should be completely replaced The casing of the unit should not be removed The input and output pins are as given in Tables 1 and 2 with stated pin allocations as observed from th
19. ANUAL Issue 1 Page 31 of 41 ASV YAO noor ASI Aste Arle 99 HOS 920 200 ov 5 SIS 2501 an Aoa 110 Wadvd 9788 vias MOLOnONI 915 dni Sis 993 _ 96 0201 ov esn 95 Lola 13 3 4 4 gt iMalv 39923 46104005 OLY 50 200 ee s ae Ss zsn pem A30dX3 Qn o3 1014 HOSS t0 700 i30 1 100 W3dvd on ONT 8135 yas ony 25523 13995 IML 94850 Saa AAQ91 Jes 1 QN 2 207200 lola Quaiv gasso 4027 Imoa POLO 002 02 6 sheet 2 of 7 Drawing Number
20. Circuit Circuit diagram 002 06 6 refers 2 and CX9 form the tuned input circuit for the received modulated ultrasonic signal Transistors QX4 and QX5 form a cascode amplifier enabling an optimal received signal DC bias for the amplifier is set by RX7 and RXS at the gate of QX4 The tuned circuit load in the drain of namely LM2 and amp is adjusted to peak the received signal Diode acts as a peak detector to remove the audio Doppler shift signal from the 2MHz carrier The time constant of components RX10 and CX10 remove the higher frequency signal enabling the audio signal to be applied to a band pass filter via a c coupling capacitor CX11 The band pass filter has a pass band of 150 Hz 1 KHz to further optimise the audio output signal Operational amplifier UMI provides some gain and provides a low output impedance drive to the next stage The d c supply arrangement showing filter U28 and regulator U32 convert the 15 volt supply rail into a clean 8 volt supply rail for the ultrasound d c supply Circuit diagram 002 05 6 refers e Audio Amplifier Circuit diagram 002 07 6 refers An analogue switch U17 at the front end of the audio amplifier allows one of the four following analogue channels to be selected 1 Ultrasound audio channel 1 2 Ultrasound audio channel 2 3 bleep an approximate tone of 2 KHz indicating ECG correlation 4 External tape input used off line as required via a tape deck u
21. HR2 Print Offset Normal Places Channel 2 ultrasound printout 30 BPM below actual value enabling minimal dual trace interference Places Channel 2 ultrasound printout at actual position HR2 Line Thin Normal Select thin line print trace Select normal print trace line thickness Trace ID s On Off Tum on trace identifier labels Turn off trace identifier labels UA Base Off 20 Sets UA relative base reference to zero Sets UA relative base to selected value UA Filter Off On Turns output smoothing of UA output off Turns output smoothing of UA output on Printer Speed 1 2 3 Change printer chart speed to selected rate Printer Test On Off Select printer test Select no printer test At this stage pressing UA will allow all settings entered to be stored before selection of Operational Mode If any values need to be re inputted press UA whilst the message Press UA to Enter Setup is being displayed prior to normal operation commencing FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 20 of 41 safety tests This section details the safety tests which should be performed on the instrument at regular intervals and also after any repair work which could affect the safety aspect of the unit Ensure that the safety test equipment is good working order and within its periodic test date All test results should be recorded on record sheet TR 0007 and filed for future reference An example of the TR0007 record sheet contents can
22. S en vo 90 e vo zz 2 lt 9 lt Ca gt 24 z E acu 556 FEE 8 883 dH ERER 995 lt lt lt Y1 Y3 3 u m 01 5585 FEES d a x c a d ad ard a e 4 14141441 01000001660 INTERRUPT gt Drawing Number 002 03 6 sheet 3 of 7 FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 33 of 41 wadva gt 0 Y30YAH Juasau SM AONYA r xo SOA lt cj t 32953 daas 993 gt F SOHPL 3104 uw ausso gt advi 1999 gt 9N 923 ONT TOA 8135 was ST Y YS Y Y Y Ye Tos Page 34 of 41 Issue 1 Drawing Number 002 04 6 sheet 4 of 7 FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL lt uas3u koa
23. awing Part M 1 0002 Quantity Number Item Number Base M 1 0058 10 1 Card Guides 76120100 26 2 Carriage Assembly M 1 003 1 1 Chassis M 2 0053 8 1 Chassis Socket 12 way Pink 56210212 57 1 Chassis Socket 12 way Yellow 56214012 58 1 Chassis Socket 12 way Blue 56216012 59 1 Connector Plate 3 way M 3 0060 11 1 Cover M 1 0056 9 1 Crimp Terminal M3 Eyelet 56700003 60 1 DEXDYNE 486 PCB 04008108 19 1 Digital PCB 04008201 18 1 Display PCB 04008202 22 1 Earth LeadPower Connector M 4 0073 29 1 Earth LeadCarriage to Chassis M 4 0074 30 1 Earth LeadCarriage to Paper Tray M 4 0076 31 1 Earth LeadLid to Chassis M 4 0078 32 1 Earth LeadRear Panel to Chassis M 4 0079 33 1 Earth LeadFront Panel to Chassis 4 0080 34 1 Earth LeadFront Panel to Front Panel 4 0081 35 1 PCB Assembly 02608203 20 1 Electrical Assembly M 1 0057 15 1 EPROM SGST 27C200112F1 B E001055 19 1 Front Moulding M 1 0045 2 1 Front Panel Overlay M 2 0049 4 1 Front Panel OverlaySEWARD M 3 0050 5 1 Heatsink Modification 4 0084 17 1 IC Label M 4 0085 36 1 LCD Display Module 44206268 21 1 Mains Inlet Socket 69000002 24 1 Mains Switch 61110000 27 1 Nut SS 3 Hex B H000145 53 1 Nut SS M4 Hex B H000568 54 8 O Ring 8 7 ID x 12 OD BS611 B M001075 61 2 Pillar Male Female Hex PSM SPA 02 B M001052 51 2 MS M316 Power Supply XP 67007902 23 1 Programmable IC Label M 4 0083 16 5 Rear Moulding M 1 0046 3 1 Rear Panel Overlay M 2 0051 6 1 Rear Power Label M 3 0052 7 1
24. be seen at the end of this section Test Equipment Requirements Rigel safety tester Model 233 Procedure e The electrical safety tester must be plugged into a standard power socket with a known good earth e The instrument to be tested Instrument Under Test IUT should be connected to the power outlet on the tester Note For 110 volt instruments this should be via a suitable variac e Set tester to type B 21T Antepartum OR Set tester to type BF 2IT Antepartum e Ensure that the mains switch at the back of the IUT is in the ON position Depress the front panel switch Connect the transducers type B or the TOCP Scalp electrode type BF to the applied part using crocodile clips e Switch ON the safety tester e TEST 1 Safety tester system check All lamps on the safety tester must be illuminated and the meter needle must indicate within the test arc of the meter scale e TEST 2 Supply voltage check Mains LED on and meter reading between 230250 volts e TEST 3 Input resistance mains to case Depress test pushbutton meter reading must be 1 Mohm e TEST 4 Insulation resistance applied part to case BF only Depress pushbutton meter reading must be 10 Mohms e TEST 5 Protective earth continuity Using probe hold firmly against all metal parts listed below and depress TEST pushbutton for minimum of 2 seconds per operation Meter reading must be 0 2 ohms in each case All case screws front panel rear panel and cover
25. bipolar stepper motor having a step angle of 1 8 degrees The motor is driven using a four channel push pull driver circuit U18 with inductive load protection at its output consisting of diodes D2D5 and 29012 The output drive appears at FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 14 of 41 header J6 10 way Harwin for connection to the motor The motor step function is carried out under software control in conjunction with programmable device U12 Main Digital PCB Circuit diagrams 002 02 6 002 02 6 and 002 02 6 refer Areas of the main Digital p c b not described above are included in this section PC104 interface control signals that connect to the Dexdyne p c b are via a 60 way ribbon cable and associated connector 716 is the decoding GAL programmable logic device used to derive all read write control lines to the various sections of the Digital p c b Transistor Q1 is used to drive the reset signal from the PC 104 interface to the distributed reset required on the main Digital p c b U20 is a latch for controlling the 21T volume control ECG AGC circuitry and audio selection logic Latch U20 is I O mapped U37 and connector J24 allow connection to logic inputs enabling the determination of front panel connector status and other auxiliary inputs Latch U37 is I O mapped Circuitry on the main Digital p c b allows AD conversion to be performed U24 is the AD converter which is an 8 channel input d
26. c b linked to UA socket Remove connector at J24 on Digital p c b linked to Cardio 1 UA and Cardio 2 sockets Remove connector at J4 on Digital p c b linked to Display p c b Remove connector at JM20 on Digital p c b linked to Cardio 1 socket Remove connector at JM21 on Digital p c b linked to Cardio 2 socket Remove connector at J14 on Digital p c b linked to Display p c b Remove connector on ECG p c b linked to Cardio 2 socket Remove Front Panel by unscrewing the three M3 Base holding screws Once the Front Panel has been removed the dismantling full access of the Digital p c b proceeds Remove the two O rings associated with the ECG one on each p c b guide Remove guide p c b securing screw on each ECG guide Carefully ease the ECG p c b vertically away from the associated edge connector on the Digital p c b Remove the M4 securing screws to release the Digital p c b from the Base FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 11 of 41 Circuit descriptions Introduction Circuit diagrams quoted within this section are enclosed at the rear of this manual The electronic hardware design for the FETATRACK SERIES 21T CARDIOTOCOGRAPH is based upon a Single Board Computer SBC supplied by Dexdyne Ltd The primary interface to the rest of the circuitry uses a standard PC104 interface as defined in the Intel ISA bus standard The bus connects to a main digital p c b FMX 1002 01 6 via a
27. e lateral alignment is within 0 5 mm i e the 50 and 150 lines align with those on the chart paper The density of the trace is even along the complete length and width of the trace Switch the instrument OFF at the rear panel disconnect from the mains Remove test printout sign and date Setting up the Monitor Software Options The Fetatrack 21T can be configured for specific applications by programming the instrument using the front panel switches Connect the instrument to the mains supply and set the mains switch at the rear panel to the ON position Observe that the green ON LED at the front panel illuminates If the 486 processor board is running the LCD display should display two messages e Seward Fetatrack 21T e Version 1 00 This is then followed by the display of System starting Please wait when the UA pushbutton should be pressed in order to enter the setup mode The display will now prompt the user to Set Defaults allowing default values to be set by pushing either volume control on the front panel in order to indicate YES to the default values As they are to be set now select NO and continue pressing UA for access to the rest of the functions to be set up Table 3 below gives a description of the individual fields and their effect To change the value of the selected field press VOLUME UP or VOLUME DOWN keys Pressing UA saves the selected value and moves on to the next field Table 3 Monitor Setup Fields Effect
28. e that the UA display indicates 50 1 unit Press the UA ZERO pushbutton the UA display should go to zero Pump the sphygmomanometer until the column of mercury indicates 150 units and note that the UA display reads 100 2 unit Release the valve on the sphygmomanometer and note that the display returns to zero Check that the trace on the chart print out follows the changes in pressure The alignment of the trace should be better than 0 3 mm Release the valve in the pump and the trace will return to zero Press and hold down the recorder ON OFF pushbutton The LCD will indicate Form Feed The chart recorder will print a summary of patient care details and then fast feed before switching itself OFF Remove both the ECG simulator and the sphygmomanometer from the instrument Chart Recorder Alignment Simultaneously press and hold down the UAO pushbutton and Printer ON OFF pushbuttons The LCD display will indicate Printer Test On for the top line and To Continue for the bottom line The recorder will start to print a test pattern consisting of two types e The first type is an UP DOWN staircase to show that the vertical line is printing satisfactory e The second type consists of diagonal lines that extend to the top and bottom of the chart paper so that alignment of the paper can take place To stop the pattern press UAO the 21T instrument will re initialise and start again Test Trace Inspection Inspect the trace to ensure that th
29. e top of the unit Table 1 3 way Molex Mains Input Pin Numbers Description Pin 1 Earth Pin2 Neutral Pin3 Live Table 2 13 way Molex DC Output Pin Numbers Description Pins 1 2 and 3 5 volts Pins 4 5 6 and 7 0 volts Pins 8and9 12 volts FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 12 of 41 11 12 volts Pin 13 24 volts Ultrasound Circuit The circuitry associated with the two ultrasound channels is incorporated on the main Digital p c b and both are effectively identical Therefore the following description will only apply to channel 1 although it is directly applicable to channel 2 There are three separate circuits per channel e Oscillator and Transmitter Amplifier Circuit Circuit diagram 002 06 6 refers Transistor QX1 and associated components LM1 2 and RX1 form Colpitts oscillator running at a nominal frequency of 2 MHz Components RX2 RX3 QX2 and form an emitter follower to buffer the oscillator to the next stage and to provide oscillator amplititude control CX4 a c couples the oscillator to the buffer The final stage of this circuit forms a tuned circuit that may be adjusted to match the output impedance of the ultrasound transmitting crystal CX6 and form the tuned circuit in association with QX3 RX4 and RX5 The output from 1 goes via signal filters not fitted in this application to 20 on the main Digital p c b e Receiver and Detector
30. etal Electrocardiograph Internal Uterine Activity FET Field Effect Transistor FHR Fetal Heart Rate GAL Gate Array Logic gm Gramme FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 4 of 41 GND Hex Hz IC IUP IUT LCD LED mA MHz mV PCB Pk Pk RAM RMS r m s SBC Skt SS TTL UA US EXT UA V v XTL Ground Hexadecimal Hertz Integrated Circuit IntraUterine Pressure Instrument Under Test Liquid Crystal Display Light Emitting Diode Milliamps Megahertz Millivolts Printed Circuit Board Peak to Peak Random Access Memory Root Mean Square Single Board Computer Socket Stainless Steal Transistor Transistor Logic Uterine Activity Ultrasound External Uterine Activity Voltage volts Crystal FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 5 of 41 Description of the Instrument Front Panel The front panel of the instrument contains various facilities to control the general monitoring functions Panel mounted membrane activated switches are operated by pressing for approximately one second Mains ON OFF indicator Liquid Crystal Display LCD module and its respective display PCB Printer ON OFF controls the operation of the thermal printer Pressing once switches the printer ON at the preset speed and pressing again changes the printer speed Pressing and holding switches the printer OFF and fast feeds blank paper Volume Control Switche
31. evice controlled via the PC104 bus using 723 write latch U21 read latch and 722 signal control programmable logic device U6 in conjunction with U14 generate all clock signal timing references for the main Digital p c b The master oscillator input is from U5 a TTL oscillator operating at 8 MHz Dexdyne PCB The Dexdyne p c b is a stand alone Single Board Computer SBC It is PCAT compatible and specifically designed for the embedded OEM market place This application requires the microprocessor to have a co processor resident for intensive mathematical functions thus enabling it to provide the necessary computing power for the 21T processing requirements The currently used version of the 486 uses a DX4 100 486 chip Other versions used include an IBM DX2 processor Features of the p c b include e Support chip set incorporating power management local bus IDE disk interface standard AT keyboard interface and a standard AT battery backed Real Time Clock e Interface to the main Digital p c b is via the PC104 interface which physically uses a 60 way cable The allocated memory address space for the Digital p c b is mapped to a base address of 340 Hexadecimal in the 486 address space All reading and writing to the main Digital p c b from the Dexdyne p c b is derived from this base address Note Due to the nature and complexity of the p c b it is not intended to describe its operation It is a line replaceable
32. his PSU is a DC DC converter which takes in the d c supply to the respective p c b and outputs an isolated 15v and 15v supply for all the isolated circuits The other circuit on 02608203 sheet 1 is for the nonisolated IUP The IUP input signal derived from an external pressure transducer enters PL7 and PL8 into instrumentation amplifier U16 for signal amplification 02608203 sheet 2 refers The signal is then passed via a linear isolation circuit comprising U13 77 and 4 to gain stage U7 and filter circuit U8 with associated components The output d c signal is then fed to an AD converter on the main Digital p c b where it is sampled and used by the control programme for interpretation and display of the IUP signal The non isolated IUP circuit has offset and gain potentiometers which can be adjusted for optimum output to the AD converter on the main p c b FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 16 of 41 test and calibration Introduction The following tests are necessary in order to ensure that the FETATRACK SERIES 21T CARDIOTOCOGRAPH is operating within specification These tests may be carried out in whole or part However if any repairs are carried out then it is recommended that the whole test calibration procedure is undertaken Before proceeding the hand held event marker should be connected to the rear panel jack socket EXTERNAL MARKER Paper Out Sensor Load paper into the recorder
33. n to the Printer Item 2 Electrocardiograph ECG PCB N GO ON A Q FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 9 of 41 e Remove the two O rings one on each p c b guide e Carefully ease the p c b vertically away from the associated edge connector on the Digital p c b Items 3 and 4 Display PCB and LCD Display These are permanently solder linked by a Nortronic 14way flexistrip and will be dismantled together by removal of e Two screws securing the Display p c b e Two screws securing the LCD module Six metal twist type securing pieces associated with the LCD module will require careful adjustment in order to allow full release of this unit Item 5 Printer e Removal of chassis earth wire at point H Ref Drawing M 1 0002 by unscrewing the associated M4 securing nut e Removal of two screws securing Printer to base Note Belt replacement is affected by pulley removal each pulley is secured to its respective spindle by a single hexagon socket set screw through the pulley gears Rear Panel Associated Items Items 79 are associated with the Rear Panel which requires to be removed before these items may be dismantled or fully accessed Dependant upon the unit required to be removed or fully accessed will determine the degree of sequential dismantling required As stated under Front Panel Associated Items the Front Panel has to be considered for dismantling full access of the Digi
34. nput receptacle The fuses are externally accessible just above the a c line input receptacle For 110 VAC operation the rating of the fuses are 2 amps slow blow 250 volts ra ng For 240 VAC operation the rating of the fuses are 2 amps slow blow 250 volts rating e ON OFF toggle switch which allows mains a c power to be applied to the Line Neutral Earth L N E terminals of the internal power supply unit Mains power may be either 110 or 240 VAC at 50 60 Hz dependant upon mains availability at the location External Mark jack socket for equipment connection to a patient operated push switch used for signalling fetal movement e Accessory socket 15way D type for equipment connection to external peripherals Internal Layout The following descriptions assume that the top cover has been removed and the front panel facing the viewer e Thermal Printer Assembly left front with paper read out through front panel The printer records Foetal Heart Rate FHR Uterine Activity UA and Foetal FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 7 of 41 Movement Event Mark together with date time and recorder speed on thermosensitive z fold paper e Digital printed circuit board p c b an L shaped p c b with the major area lying along the equipment s right hand side At the instrument rear this p c b lies under the DEXDYNE p c b On the right hand side of the Digital p c b is a 64way indirect edge connec
35. otified immediately at the manufacturers address stated on page 2 The instrument may be operated at a nominal voltage of either 110 volts AC or 240 volts AC 50 60 Hz according to local supply ratings A fitted universal power supply allows input voltages of 90 260 volts AC with no configuration setting necessary for the instrument In the event that the equipment needs to be returned to Seward Ltd for servicing or any other reason then use the same packing material in which the instrument was delivered If this is not possible the instrument should be packaged in a strong box of suitable size and with adequate protective padding Manufacturers address Seward Ltd Roman Way Fison Way Industrial Estate Thetford Norfolk IP24 1 Telephone 01842 754706 FAX 01842 755039 FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 3 of 41 Safety This instrument has been designed to meet IEC601 part 1 BS5724 part 1 requirements The following procedures are recommended to ensure continued maximum safety for the patient and operator e Do not service the instrument or its accessories while it is being used on a patient Always inspect transducers cables and power lead before using the monitor If the power lead or associated electric plug become damaged in any way whatsoever then they should be replaced immediately by a qualified technician Do not use the instrument until such repairs have been carried out e The powe
36. r lead of this instrument should only be plugged into a three wire grounded receptacle The required power source for operation is single phase with the neutral line at or near ground potential and with a separate safety grounded conductor The receptacle should be wired in accordance with the National Electrical Code e Dangerous voltages exist within this instrument Covers and panels MUST be in place and secured while it is in use and MUST ONLY be removed by a qualified technician e The units are NOT explosion proof and MUST NOT be used in the presence of flammable anaesthetics e The rear panel accessory connector is provided to interface with specially designed accessories Total leakage current including approved accessories shall not exceed the requirements of BS5724 part 1 IEC601 part 1 e fin any doubt regarding the correct operation of this instrument or interpretation of resultant information foetal condition MUST be checked immediately by an alternative method Abbreviations Abbreviations used within this manual are A a Amperes Amps AC a c Alternating Current ACIA Asynchronous Communications Interface Adaptor A D Analogue Digital AGC Automatic Gain Control b Beats BPM Bauds per Minute cm Centimetre s Conn Connector CPU Central Processor Unit DC d c Direct Current DVM Digital Voltmeter ECG Electrocardiograph ECN Engineering Change Note EPROM Erasable Programmable Read Only Memory FECG INTUA F
37. rol standards and any unauthorised modifications including the fitment of components other than those supplied and certified by the manufacturer invalidates the manufacturer s warranty This service manual has been written in order to assist in the maintenance and repair of the FETATRACK SERIES 21T CARDIOTOCOGRAPH The monitor should only be serviced by qualified technicians and then only after careful study of this manual Safety checks applicable to the monitor are contained in this manual at page 28 All instruments are thoroughly checked in accordance with these instructions prior to shipment to customers but periodic scheduled safety checks are strongly recommended in order to ensure that the monitor continues to meet safety specifications All drawings and circuit descriptions contained within this manual are correct as of the date this instrument was assembled and tested but the manufacturer reserves the right to make such changes as deemed necessary to improve the design and operational standard If this instrument does not exactly conform to details as given in this manual the manufacturer should be contacted in order to obtain revision information Unpacking Note Retain all the packing material for possible future use Upon receipt this instrument should be inspected for any form of physical damage and checked for correct functional operation For any physical damage noted or operational malfunction experienced Seward Ltd should be n
38. s FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 19 of 41 Field Value Description Set Hours 023 Sets the real time clock Hour Mode Sets Minutes 0 59 Sets the real time clock Minute Mode Set Day 131 Sets day Set Month 112 Sets the month Set Year 099 Sets the year Set Hi Alarm OFF 160 120 Sets Hi Rate alarm OFF Sets Hi Rate alarm ON to indicated BPM Incrementing in 5 s Sets the alarm threshold at which LO alarm computing starts Set LO Alarm OFF 60 120 Sets Lo Rate alarm OFF Sets Lo Rate alarm ON to indicated BPM Incrementing in 5s Sets the alarm threshold at which LO alarm computing starts Upon completion of the field setup sequence the instrument can either be returned to Operational Mode or alternatively placed into the Engineering Setup Mode e To return to Operational Mode momentarily press UA e To enter Engineering Setup Mode press and hold down UA Table 4 gives a description of the individual fields and their effect in Engineering Setup Mode To change the value of the selected field press VOLUME UP VOLUME DOWN keys Pressing UA saves the selected value and moves on to the next field Table 4 Engineering Setup Fields Effects Field Value Description Paper Scale 206 30b Sets the chart scaling factor to 30 beats cm Sets the chart scaling factor to 20 beats cm Date DD MM YY MM DD YY Sets printed date to European format of dd mm yy Sets the printed date to American format of mm dd yy
39. s Quantity 2 One switch with arrow marker pointing upwards in order to increase output level from speaker One switch with arrow marker pointing downwards in order to decrease output level from speaker Volume Control Selector Switch for audible monitoring of either foetal 1 or foetal 2 audio signals Uterine Activity Zero UA for setting the zero reference value for the Toco transducers Cardio 1 12 pin polarised input socket for Foetal Heart Rate FHR Ultrasound f if 1 transducer or Electrocardiograph input Coloured pink pud FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 6 of 41 Uterine Activity 12 polarised input socket for Toco IntraUterine pressure N pue transducer input Coloured yellow oos Cardio 2 12 pin polarised input socket for foetal heart rate FHR Ultrasound UE EU 7 E N ff 94 9 N 1 e transducer Electrocardiograph input Coloured blue AD US EXT UA US EXT UA Ultrasound External Uterine Activity FECG INT UA Foetal Electrocardiograph Internal Uterine Activity FECGANT UA Rear Panel Facilities and controls supported by the rear panel are e AC Line Input receptacle 3pin IEC standard for connection to the mains supply via a suitable power lead e Fuses and F2 incorporated in the a c line i
40. sing pre recorded FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 13 of 41 foetal ultrasound heart beats The selected signal is controlled via U15B which in turn is controlled via the PC104 bus interface from the 486 SBC under programme control The two ultrasound inputs are fed to the switch via two identical circuits associated with the two operational amplifiers UB1 and UB2 These are configured as noninverting gain amplifiers used to boost the signal level to the audio amplifier They are AC coupled to allow for a change in d c operating conditions The output from the analogue switch is fed via two buffer amplifiers U11B and U11A In conjunction with digital potentiometer U10 these buffers perform a volume control function for the amplifier The digital potentiometer U10 is controlled via the PC104 bus under programme control The loudspeaker is driven by a dual 8 watt push pull audio amplifier which has two separate amplifier stages shown as U4A and U4B The amplifiers provide the power to drive an 8 ohm speaker The operational amplifier U3 provides signal inversion and conditioning from the received signal The filter U2 ensures a clean 24 volt supply rail for the audio amplifier Tocodynamometer Circuit Toco Circuit diagram 002 05 6 refers The Toco circuit is incorporated on the main Digital p c b The Toco transducer connects via the front panel wiring of the UA transducer to J23 3 way header e Pinl is the 5
41. t Circuit Check ECG does not function ECG mode select not seen Leg plate connections ECG assembly Links leads connections ECG electrode connections to leg plate missing Continuity of leg clip terminals to plug contacts Check overall functioning with ECG simulator Connect ECG simulator to CARDIO input on monitor Set output to 120 BPM Check ECG rate is displayed output from loudspeaker and also printed correctly Run printer and check that status line indicates that ECG is connected If not either links in ECG lead are missing or faulty or connections between connector and main Digital p c b faulty Uterine Activity Problems FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 24 of 41 Symptom Suspect Area Check UA pressure does not register on chart printout UA mode select not seen TOCO transducer Links leads connections Replace transducer Run printer and check that status line indicates that UA is connected If not either links in UA lead are missing or faulty or connections between connector and main Digital p c b faulty FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 25 of 41 Recommended spares Description Drawing Part Number Cable Assembly Ribbon 60way 4 0070 Cable Assembly Ribbon 60way M 4 0071 Capacitor 0 0047 F B 1044 DEXDYNE 486 CPU PCB Assembly 0400 8108 Digital PCB 0400 8201 Display PCB 0400 8202 ECG PCB Assembly 0260 8203 EPROM SGST 27C200112F1 B E001055 E
42. tal p c b Sequential dismantling down to the Digital p c b is First Rear Panel Second Power Supply Third DEXDYNE PCB Fourth Digital PCB Separation of the Rear Panel from the base is affected by removal of e Connector at J22 on Digital p c b linked to speaker e Line brown and neutral blue wires from Fused Appliance Filter Inlet e Line brown and neutral blue wires from ON OFF switch e Earth wire from rear panel by removal of M4 hexagon nut e Nut from External Mark jack socket Removal of Front Panel may now be carried out by unscrewing the two M3 Base holding screws Note The following dismantling procedures assume that the Rear Panel has been removed as detailed above Item 7 Power Supply e Disconnect 13way connector from p c b at rear of Power Supply unit e Disconnect 5way connector from p c b at rear of Power Supply unit Removal of Power Supply unit may now be carried out by unscrewing the four M4 Base holding screws Item 8 DEXDYNE PCB e Remove 0 5v plug at JP5 on DEXDYNE p c b e Remove 60way connector at JP13 on the DEXDYNE p c b The DEXDYNE p c b may now be removed by unscrewing four M4 screws FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 10 of 41 Two screws from pillars secured to Digital p c b Two screws from pillars secured to base Item 9 Digital PCB This will entail the removal of the Front Panel Remove connector at J23 on Digital p
43. tor into which is vertically mounted a plug in ECG IUP card e DEXDYNE printed circuit board p c b a rectangular p c b that lies flat from left to right along the rear of the instrument The left hand side of the p c b lies beneath the power supply unit and the right hand side of the board lies above the digital p c b Power supply XP fitted on the left hand side of the instrument behind the printer assembly and above the DEXDYNE p c b FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 8 of 41 Dismantling Instructions Warning before dismantling the instrument ensure that the mains power is removed and all leads inclusive transducers are disconnected and suitably stored This section describes the sequences required to dismantle the instrument and gain access to the various units The top cover has to be removed first in order to allow access to all the instrument sub assemblies This is carried out by inverting the unit and resting it cover down on a clean and protective surface There are four 4 securing screws to be removed from around the periphery of the base one screw sited close to each instrument foot The instrument should then be carefully re inverted and placed on its feet when the cover may now be removed by lifting it upwards away from the base Ensure that the earth bonding cable connecting the cover to the base earth is disconnected by removing the securing nut and washers The
44. xternal Mark Patient Switch Fan Motor Assembly G 3 4046 Fuse T2A Mains Input Fuse XP Power Supply Unit Fused Appliance Filter Inlet Schaffner B E000377 LCD Display Module 4420 6268 Lithium Battery Paper Sensor Assembly M 3 0069 Speaker 6540 0077 Step Motor N 103 546 5540 B E001000 Thermal Printhead 128 B E001001 Timing Belt 71 MXL 0 080 Pitch M001002 Timing Belt 122 MXL 0 080 Pitch B M001003 Transducer 21T Ultrasound M 1 0059 Transducer 21T Ultrasound 0215 0003 Transducer 21T Uterine Activity 1 0082 Transformer Mains 110 240 volt Transient Suppressor SA 5 0A RS 192654 B E001047 Tubular Ferrite Sleeve Farnel 559532 B E001043 Note Chart paper supplies may be obtained from Seward Ltd at the address stated on page 2 of this manual FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 26 of 41 Parts lists The following parts lists are included in this section Description Assembly Number Carriage Assembly M 1 0002 19 Electrical Assembly 1 0057 21 General Assembly 1 0002 22 Page Carriage Assembly Drawing Number M 1 0002 Description Drawing Part M 1 0002 Quantity Number Item Number Base Plate M 3 0013 9 Bush 7159 1010 20 Cam M 3 0010 6 Cam Bush M 4 0008 18 Crimp Terminal 5250 1000 44 Crimp Terminal Housing 10 way 5211 1010 43 Door M 2 0004 1 Earth Lead Carriage to Door M 4 0075 23 Earth Lead Carriage to Paper Tray M 4 0076 24
45. y This is necessary so that the IUP transducer stabilises whilst the ECG tests are being carried out Press the printer ON OFF pushbutton to start the printer select 3 cm min The simulated ECG rate should be establish within 20 seconds the FHR display will indicate the rate and the ECG bleep tone will be generated by the loudspeaker The foetal pulse LED will flash in time with the bleep The rate will be recorded on the chart printout The 21T instrument will only allow changes in Heart Rate of up to a maximum of 15 BPM before it will drop the correlation so changes should go down in steps of fifteen Thus the next HR selected should be 105 BPM 90 BPM 75 BPM and 60 BPM Check that at these rates the printout is continuous and also that no drop out is observed on the LCD display Also check that when increasing the rate in the opposite order the rate follows again This test needs checking for four minutes going UP and DOWN in rates once every minute Note 1 The potentiometer on the ECG simulator specified is very noisy thus some rate variations may be evident 2 The minimum rate of 60 BPM is not displayed therefore it is best to use a rate of 62 BPM at the lower end FETATRACK SERIES 21T CARDIOTOCOGRAPH SERVICE MANUAL Issue 1 Page 18 of 41 Simulation Test Intrapartum Models Only Press the UA0 pushbutton to set the baseline to zero Pump the sphygmomanometer until the column of mercury indicates 50 units and not
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