- Frank`s Hospital Workshop
Contents
1. Ref Part Number Description 10 614398 SPEAKER WIRE PREPARED 20 614399 SPEAKER 40 397 792 SLEEVING 50 614400 SPEAKER CLAMP PLATE 60 614401 SPEAKER MOUNT PLATE 70 M3 NYLOC M3 NUT 80 M3 WASHER M3 WASHER Issue 2 DRAFT 65 Rev a 614365 Ref Part Number Part Number Description 20 614404 USI TDR CABLE ASSY 40 614402 851 TRANSDUCER 50 614408 614408 USI BUTTON RED 60 614405 614405 USI SERIAL LABEL 70 614407 614407 US1 TDR LABEL 80 M2 5X6 POZI PAN M2 5X6 POZI PAN POZIPAN SCREW 90 M2 5 WASHER S M2 5 WASHER M2 5 WASHER SHAKE 100 M2 5X8 POZI PAN M2 5X8 POZI PAN POZIPAN SCREW 110 WNI412 KB22 8 WN1412 KB22 8 POZI PAN SELF TAP SCREW Serial numbers up to 895 serial numbers over 895 66 Issue 2 Draft Rev a 614365 Ref Part Number Part Number Description 10 614415 TDR 20 614409 BASE 30 614410 614410 BUTTON BLUE 40 614412 CABLE 55 60 M2 5 WASHER S M2 5 WASHER S M2 5 WASHER SHAKE 70 M2 5X8 POZI PAN M2 5X8 POZI PAN 2 5 POZI PAN 80 WN1412 KB22 8 WN1412 KB22 8 SELF TAP SCREW 90 1211 1211 BOOT 100 1208 1208 SEALING GASKET 110 1204 1204 TRANSDUCER SPACER 120 1210 1210 TOCO BUTTON 140 614411 62. eto eoe h a d 15 6 BD4000 overview 16 6 1 BD4000 Micro Section 17 6 2 BD4000 Analogue Section 18 6 3 BD4000 Power Supply Section s 20 Issue 2 DRAFT Rev 614365 6 4 BD4000 Printer Section 21 6 5 BD4000 Rear Panel Section 22 6 6 BD4000 Front Panel PCB 23 7 BD4002 overview 24 7 1 BD4002 Micro 25 7 2 BD4002 Analogue Section 26 7 3 BD4002 Power Supply Section 28 7 4 BD4002 Printer 29 7 5 BD4002 Rear Panel Section 30 7 6 BD4002 Front Panel 31 8 BD4000 BD4002 Transducers 32 8 1 US1 Ultrasound Transducer 32 8 2 PEGG CO Plates iata dm od eie d ole xe dir Sera ee 33 83 IUP Modules s etic eck a D RUS RE ne aces 34 9 Electrostatic Discharge ESD Precautions 35 9 1 What is Static Electricity2 35 9 2 Protective Measures 35 10 Servicing Procedures Main Unit 36 10 1 TorqueSettings 36 10 2 Unit Dismantling
3. should be followed Symptom Possible Cause check Unit dead Fuses in mains inlet blown or PSU Fault codes on printout see section 11 1 No outputs from PSU No Audio Volume level low Test with known good ultrasound transducer BD4002 check correct channel selected if two transducers fitted Not printing paper driven Paper wrong way up Refit paper pack ensuring that the shiny side is uppermost this sensitive side can be easily marked with a fingernail Print head alignment Print head dirty Not printing paper not driven Paper tray incorrectly shut Printer roller gear incorrectly engaged US transducer dead Check transducer cable Check twins cable if used Twins mode not working Check twins cable sockets Check address set to 10 on both units See section 11 3 52 Issue 2 Draft Rev a 614365 11 1 Error Codes Under certain fault conditions the BD4000 will print error codes relating to faults within certain sections of the circuitry When an error 15 detected and 15 first switched on a printout will automatically be generated as shown below The unit will then shut down Line Description Comment 1 PCB S No date of Factory preset manufacture 2 Software version Factory preset Language English User selectable Scale 20 beats cm grid on Chart 3cm min Mode internal use
4. 37 10 3 Unit Reassembly 37 10 4 Display Front Panel Switch PCBs Removal 37 10 5 Display PCBs Refitting 37 10 6 Display PCB Metalwork Removal 38 10 7 Refitting Display PCB Metalwork 39 10 8 Main PCB Removal 40 10 9 Main Refitting 40 10 10 Print Head Removal 58 aa 40 10 11 Print Head Refitting 41 10 12 Print Head Alignment Procedure 41 10 13 Stepper Motor Removal 42 10 14 Stepper Motor Refitting 42 10 15 Power Supply Removal 44 10 16 Power Supply Refitting 44 Issue 2 Draft Rev a 614365 10 17 Mains Inlet Removal d etse 44 10 18 Mains Inlet Refitting 44 10 19 Speaker Removal 45 10 20 Speaker Refitting 45 10 21 Rear Panel Connector Removal 45 10 22 Rear Panel Connector Refitting 45 10 23 Paper Tray Open Microswitch 46 10 24 Paper Tray Open Microswitch Refitting 46 10 25 Paper Tray Removal 46 10 26 Paper Tray Refitting
5. 614365 7 1 BD4002 Micro Section Display amp Control Event Marker Micro controller Digital Signal Reset Processor Watchdog Timer bel Bootup Serial Ports Real Time ROM Clock ROM Probe Analogue l Real Time Clock this enables the micro to displav the date time on the trace and front panel User setup information is held within internal memorv of the clock EEPROM Watchdog Timer this monitors the micro and checks for system errors Upon detecting a system error the micro is reset All controls revert to switch on settings Event Marker this patient event marker records a mark on the printout in a different place from the clinical event marker accessed via the front panel see user manual Serial Ports the rear connector PCB supports two D type RS232 connectors for external interfacing Display PCB is mounted on the top half of the case moulding and consists of two separate PCBs joined by a short ribbon cable This also carries the system controls ROM the ROM memory contains the program RAM the main PCB has three RAM IC s two are used on the Digital Signal Processing section and the third for data processing by the micro Digital Signal Processor processes the information from the ultrasound and ECG transducers implementing autocorrelation and ECG detection for deriving the FHR DSP Bootup this circuitry loads the DSP program from EPROM to the DSP s int
6. pm Huntleigh DIAGNOSTICS BABY DOPPLEX 4000 BABY DOPPLEX 4002 CUSTOMER SUPPORT DOCUMENTATION SERVICE MANUAL 0088 Part number 614365 Issue 2 January 2000 Huntleigh Diagnostics Ltd Service Dept 35 Portmanmoor Road Cardiff UK CF24 5HN Tel 029 20496793 24 hrs Fax 029 20492520 E mail service huntleigh diagnostics co uk purpose other than that for which it was originally supplied The information contained in this publication may not be used for any en consent The publication may not be reproduced in part or in whole without wri Huntleigh Diagnostics Ltd products are subject to continuous development and consequently may incorporate minor changes from the information contained in this manual The equipment and its accessories must be used accordance with the procedures detailed this manual manufacturer and its subsidiaries cannot accept any liability for loss or any indirect or consequential damages resulting from misuse of or modification to the equipment or from operator negligence Dopplex and H logo are registered trade marks of Huntleigh Technology PLC Huntleigh Technology PLC 2000 614365 Table of Contents 1 General Information 1 lab Ba e BL 1 1 2 Servicing POC p Suk 1 1 3 ProdietDescripHon ua
7. Then select one of the following options g Using volume select test code 0 h Press button 3 to select test code 1 i Press menu button 1 j Start unit printing at the desired speed to print test grid Remove power from unit to return to normal operation 34 Issue 2 Draft Rev a 614365 Real time clock battery bed number address g Using Volume select desired option h Using keys under LCD change setting Press menu button to escape or save as appropriate 11 4 Print Head Test of narrow stripes can be printed this be used as aid to print head alignment this can be accessed as detailed in 8 3 steps a f above 11 5 Bed number During normal operation the bed number 15 printed alongside the Huntleigh Diagnostics footnote This can be changed as detailed in 8 3 11 6 Real time clock battery The real time clock battery can be disabled as detailed in 8 3 This allows the life of the battery to be extended while in storage The battery should normally be turned on 11 7 Address The address of the monitor may be changed however this is only used during factory testing and must remain set to 10 for twins mode to function BD4000 only Issue 2 DRAFT 55 Rev a 614365 12 Spare Parts List The following spare parts can be ordered from your dealer or direct from Huntleigh Diagnostics using the part numbers shown overleaf 12 1 Recommended Spare Parts Recommended s
8. we i A Us 1 1 4 Antistatic Handling Electro Static Discharge ESD 2 ASP OM SIU COR a ee PRX 2 2 Safety cec Ea kee AS A UE ee cas eb a 3 XE I he as Toa 3 2 2 Safety Testing sashes ua eo he a TRU ER 3 2 3 ud Std Rod rok OR Bod aot 4 ZANGCIGAMING scs RECTE UY bubo ox C EY Rowe POE w 5 2 5 Preventative Maintenance 6 216 iu D duode ee SER 6 3 Functional Testing ke 4 wl s os 7 3 1 BD4000 BD4002 Main 7 3 2 Ultrasound Transducers 7 A SEAS or gs t difus cadi rie 8 3 4 FECG Functional 0 9 3 5 Twins Functional Testing BD4000 9 3 6 Twins Functional Testing 4002 11 4 5 12 5 Technical 14 5 1 The Doppler 14 5 2 Doppler Audio Processing 14 5 3 Heart Rate Processing 15 5 4 Fetal Movement Detection FMD 15 So PEGG uS NITE SS RE bel i i S 15 e
9. 2 DRAFT 47 Rev a 614365 10 35Toco Transducer Alignment Equipment required a Power Supply b Digital Volt Meter c Weight 1 x 100gm Remove case top as detailed in 10 31 2 Set up power supply voltage to 5 00Vd c 0 05V Pin No Connection 1 5 Supply 5 3 GND 4 Ve O P 3 Ve O p View from rear of socket 3 Connect transducer to power supply and DVM as shown in table above 4 Turn transducer so that strain gauge is uppermost 48 Issue 2 Draft Rev a 614365 5 Apply power to strain gauge and allow 1 minute to settle Use a toco socket connected as shown above to supply strain gauge and read values 6 DVM should read zero 13 to 23mV If offset positive check that link A is cut and link B intact Replace Zero resistor with new value as required to bring the offset within specification If offset negative check link is intact and link B is cut Repair cut link with tinned copper wire as required Allow time for resistor to cool and readings to settle 7 Place 100g weight on strain gauge button observe DVM DVM should read 38 9 42 1mV Fig 17 Toco Transducer Assembly Issue 2 DRAFT 49 Rev a 614365 de A x v oiim x TE UM d I i p k 7 1 zi Ar Fi LA i oon H a A ww ak D Change the value of span resistors and repeat until within specification
10. o soi see eS hae ow Ae 72 Issue 2 DRAFT iii Rev a 614365 Appendix Ai cca Pe OO os Cte ars a 72 TSL APpendpeB us IO 13 iv Issue 2 Draft Rev a 614365 1 General Information 1 1 Introduction This service manual provides the technical information required for repair and maintenance of the Huntleigh Diagnostics Baby Dopplex 4000 and Baby Dopplex 4002 1 2 Servicing Policy Due to the nature of static sensitive surface mount technology specialised equipment and training is required when working on the surface mounted components used within this product For this reason circuit diagrams are not included in this manual Block diagrams and fault finding sections are included to make fault finding to leaded component level possible Units within the warranty period must not be dismantled and should be returned to Huntleigh Diagnostics for repair Any units returned showing signs of tampering or accidental damage will not be covered under the warranty refer to user manual for further details 1 3 Product Description General The Baby Dopplex 4000 and Baby Dopplex 4002 comprise a main unit which can be either free standing trolley or wall mounted two transducers US and Toco A patient event marker and a FECG legplate optional BD4002 is supplied with 2 US transducers Main Unit This houses the printer and electr
11. 2 ib i n Local FECG 12 25 26 5 98 3 100 HUNTLEIGH DIAGNOSTICS 150mm paper normal Issue 2 Draft Rev a 614365 3 6 Twins Functional Testing BD4002 Fit both US transducers and toco transducer and test as detailed in section 3 2 Only one FECG transducer can be used at any one time and should be tested as detailed in section 3 4 When full width paper 210mm is loaded the unit will print two FHR grids one above the other and one toco trace With the normal paper 150mm fitted the two FHR traces are overlaid on one grid and identified periodically Issue 2 DRAFT 11 Rev 4 Specification General Product Name Model No Physical Size control unit Weight Environmental Operating Temperature Storage Temperature Electrical Power Supply 100 250V a c Fuse Type Audio Power Ultrasound Transducer Transmitter frequency Acoustic Output Contractions Transducer Range Max Load 614365 Baby Dopplex 4000 Baby Dopplex 4002 BD4000 BD4002 93mm x 380mm x 250mm HxWxD 4 5Kg 10 C to 30 C 10 C to 40 C 50 60Hz T2A 250V 1 Watt max USI 1 5MHz 1 Under the requirements laid down in IEC1157 1992 the peak negative acoustic pressure does not exceed IMPa the output beam intensity does not exceed 20mW cm and the spatial peak temporal average intensity does not exceed 100mW cm 0 to 100 relative units 300g Regulatory Compliance
12. 4 Push print head support plate past pillars fit plain washers over pillars tighten nuts to 35cNm Ensure that print head support plate and head mounting plate are free to slide up and down spacers 5 Place print head assembly over mounting pillars and screws Align print head as detailed in 7 12 10 12Print Head Alienment Procedure Warning Shock Hazard Extreme caution must be taken while working in live equipment ensure that earthed case does not contact live parts Also note that parts of the power supply are live 1 With print head assembly screws tightened lightly and ribbon cable connected pull print head towards front of unit and close paper tray 2 Ensure that front panel ribbon cable is connected to main PCB and connect mains supply to inlet socket Print Head Support Pirie UIT Primi Head Fig 13 Print Head Assembly Issue 2 DRAFT 41 Rev a 3 4 614365 Start unit printing at 3cm minute and slide print head towards case rear until print density is acceptable Refer to 8 4 for setup test pattern Remove mains supply and tighten head support plate screws to 35cNm 10 13Stepper Motor Removal 1 Disconnect stepper motor connector Remove print head assembly as detailed in 7 10 and cable ties to printhead securing plate Remove stepper motor assembly clear of monitor Remove stepper motor mounting plate screws and remove mounting plate 10 14Stepper Motor Refitting 1 Fit
13. Stepper motor to mounting plate passing gear through mounting bracket noting cable orientation and tighten screws to 60cNm Insert stepper motor assembly to base fit earth lead motor support plate and screws tighten loosely Secure cables using cable ties Fit print head as per 7 11 and close paper tray Align motor gears with roller gears ensuring gears mesh allowing small amount of backlash see fig 14 Tighten screws to 60cNm Fit stepper motor connector and align print head as per 7 12 E Fig 14 Gear Alignment 42 Issue 2 Draft Rev 614365 10 15Power Supply Removal Caution Ensure that mains supply is disconnected before removing Power Supply Board 1 Remove power supply connectors noting orientation and connector types 2 Remove 4 retaining nuts and washers Lift Power Supply Unit clear from assembly 10 16Power Supply Refitting 1 Refitting is reversal of removal ensure that the PSU base insulator is fitted with largest hole at the rear left hand side of the power supply 10 17 Mains Inlet Removal Caution Ensure that mains supply is disconnected before removing Power Supply Board 1 Remove Power Supply Unit connectors 2 Remove cable ties and disconnect safety earth 3 Remove Power Supply Unit to mains inlet wiring 10 18Mains Inlet Refitting Fit Power Supply unit to mains inlet wiring and secure wiring using cable ties See fig 15 2 Fit safety earth Fig 15 M
14. around suspect components using an oscilloscope or multimeter Repairs should only be undertaken by suitably skilled service personnel Refer to section 2 6 10 1 Torque Settings To ensure that the case fixings are not damaged during servicing and that assemblies are securely fixed it is essential that the torque settings for all assemblies are adhered to Failure to torque fixing screws correctly may result in damage requiring case replacement and may affect reliability The torque setting are detailed in the relevant procedure and listed in Appendix B CAUTIONS This equipment contains static sensitive devices Refer to Appendix A for recommended anti static handling precautions It is essential that these procedures or equivalent are adopted to avoid static damage to the circuitry Due to the high density tracking and small size of components extreme care in handling the PCBs must be taken at all times When soldering take care to ensure that minimum heat is applied to the boards and components for the minimum time necessary to ensure high quality joints Inspect the area around repairs for solder splashes and bridges Refer to Appendix A for details of recommended soldering procedures Issue 2 DRAFT 37 Rev a 614365 10 2 Unit Dismantling Caution Ensure that mains supply is removed before opening unit Fig 5 Case Screw Removal 1 Invert unit on a smooth surface and remove 5 case securing screws 2 T
15. both span resistors should be of the same value If the sensitivity 15 low decrease the value of both resistors Allow the resistors to cool before repeating process Assemble the transducer as detailed in 10 34 and check zero value 15 5 to 15mV when assembled 10 36Replacing Transducer Cable 1 2 Remove case top as detailed 10 31 and desolder cable from PCB Unscrew back of metal plug and pull insert free Desolder wires and remove plug from cable Fit plug shroud to cable and attach collet Solder wires to plug as shown in Fig 19 Apply threadlock to plug body and tighten assembly CS Water resistance of US transducers can only be ensured if the units are returned to Huntleigh Diagnostics for refurbishment Solder wires to PCB as per Fig 17 18 Assemble the transducer as detailed in 10 32 50 Issue 2 Draft Rev a 614365 Pin Number Toco Ultrasound FECG 1 2 Pink 3 Black Purple 4 Violet Yellow 5 White White 6 Red 7 Black There no serviceable parts within the US transducer and repairs are limited to the replacement of the cable 10 37FECG Transducer Servicing Contact Huntleigh Diagnostics Service Department for further information on servicing the FECG transducer Issue 2 DRAFT 51 Rev a 11 Fault Finding 614365 In the event of the BD4000 BD4002 developing a fault the following checklist
16. deteriorates Repeat for FHR1 and 2 inputs using front panel to select audio channel BD4002 only 3 3 Toco Place the toco transducer on a solid surface with the rubber boot uppermost and level Press the zero button on the front panel Holding the toco transducer steady flex the cable at the transducer and plug ends Check the UA loading display and printout to ensure that there is no deviation from the zero line Depress the toco rubber boot gently and release repeat this several times Check that the UA display registers the change and returns to zero after a short delay With the rubber boot still uppermost and level reset the zero then place a 100g weight in the centre of the boot The shape of this weight is important and the contact area on the rubber boot should be 12mm diameter maximum The UA display should indicate 80 5 14 24 21 5 98 3 100 100 ix E HUNTLEIGH DIAGNOSTICS d c TT FECG Mode Ultrasound Mode 8 Issue 2 Draft Rev a 614365 Remove the weight after 30 seconds check for return to zero turn the printer off the printer should fast feed a blank section Compare the printout with the examples shown above checking for print quality date time stamp event markers ultrasound toco trace and mode i e US FECG 3 4 FECG Functional Testing Reconnect the FECG legplate Connect the patient terminals to an Fetal ECG simulator setting the voltage to bet
17. only 4 Current Time User selectable Current Date User selectable The error codes on the bottom of the printout indicate the following Error Code Possible Cause 0 No fault 1 Boot failure DSP 2 U10 U11 3 Ram U10 4 Ram UII 5 Real Time Clock Battery Issue 2 DRAFT Rev 53 614M00051 210897 SW 11317 11 20 G1 C3 TIME 08 19 52 DATE 27 05 98 POWER 00171 08 PRINT 00017 23 EVENTS EPIDURAL TOP UP EPIDURAL PETHIDINE SYNTOC I NON OXYGEN VAGINAL EXAM TREATMENT MOTHER MOVED TOCO TDR MOVED US TDR MOVED SERVICE ERROR O ADDR 010 614365 11 2 Service Notes References to servicing information can be stored within the BD4000 s memory This can be changed as shown below I d 11 Feb 97 13 54 lemim i LCN enu Tra 2 2 7 IL a Annotation 4 M Mul S Volume Scroll em Keys solt key Soft Rey Soft Key 4 1 2 3 Front Panel Button Layout 11 3 Displaying Status a Turn unit on and press menu key then button 1 b Press the printer button c The setup information shown on previous page is then printed The unit then returns to normal use Further diagnostic settings can be set as follows d Turn unit on and press setup key 1 e Press printer and button 3 simultaneously f Press button 3 until code 14 is displayed
18. or run under a tap Rinse with clean water and dry thoroughly before use Do NOT immerse connectors Phenolic or detergent based disinfectants containing cationic surfactants ammonia based compounds or antiseptic solutions such as Stericol or Hibiscrub should never be used on any part of the system as Caution permanent damage will result Contractions Transducer toco Belts Wipe with a soft cloth dampened with a mild detergent solution avoiding the connector Do not allow any fluid to seep into the transducer Dry thoroughly before use These may be hand washed at 40 C max using a mild detergent solution Rinse with clean water and dry thoroughly without using heat before use Disinfection Issue 2 DRAFT Rev a Transducers and Leg Plate Only To assist with disinfection wipe the transducers and leg plate with a soft cloth dampened with sodium hypochlorite 1000ppm and wipe dry Please be sure to check your local infection control policies or equipment cleaning procedures 614365 2 5 Preventative Maintenance The Huntleigh Diagnostics Baby Dopplex 4000 and Baby Dopplex 4002 are designed for a minimum amount of maintenance To support the high standard of performance and safety the safety and functional checks should be carried out as part of a regular maintenance routine Refer to the user manual for details of connection of cables and accessories and also for the correct settin
19. similar system is used to detect IUP Toco transducers Toco IUP Input a differential amplifier converts the balanced output from the transducer to single ended mode suitable for micro A D sampling A sense line detects when an IUP system is connected 20 Issue 2 Draft Rev a 614365 6 3 BD4000 Power Supply Section Boost Regulator 26v 10 Ud oise 10v Regulator 12v Universal Fuses 12 Switch Switch and 5v Mode PSU Filter Universal Switch Mode PSU converts standard International mains power down to 5 and 12Vdc Boost Regulator situated on the main board this converts the 12V to 26V for use by the print head and stepper motor Low Noise Regulator a low noise 10V is also produced to power the ultrasound transducer anti aliasing filter and automatic gain control circuitry Issue 2 DRAFT 21 Rev a 614365 Stepper Motor 6 4 BD4000 Printer Section Micro Data Temperature Sense Tray Open Paper Size End of Paper Detect Detect Detect Print Head is a solid state thermal array of heater elements that print onto thermally sensitive paper Strobe Control the strobe control varies the strobe width to the print head which regulates the intensity of the printout The strobe width is controlled by the microprocessor Temperature Sense this allows the micro to assess the temperature of the print head by means of a thermistor in the print head This will vary as the monitor prin
20. 14411 TOCO TDR SERIAL NO 150 WN1412 KB22 8 WN1412 KB22 8 SELF TAP SCREW 160 614434 614434 TOCO LABEL Serial numbers up to 2584 serial numbers over 2584 Issue 2 DRAFT Rev a 67 614365 13 Warranty And Service Huntleigh Diagnostics standard terms and conditions apply to all sales copy 15 avallable on request These contain full details of warranty terms and do not limit the statutory rights of the customer In the unlikely event that you need to return this product please adopt local decontamination procedures and provide documentation which outlines the product s status Please ensure that this documentation is accessible without having to open the package To order spare parts and for price information contact the Service Department at Huntleigh Diagnostics Before phoning be sure to have the following information available to ensure that our Service Department personnel are able to correctly identify your requirements Main unit model number Main unit serial number Transducer types Transducer serial number s Part numbers of items required The Service Department direct line shown below offers a 24 hour service During office hours trained staff will be available to assist you Outside office hours an answering machine will allow you to leave a message Huntleigh Diagnostics Service Department 35 Portmanmoor Road Cardiff CF24 5HN UK Service Department Direct Line 029 204
21. 26 614426 CAN INSULATOR Issue 2 DRAFT Rev a 61 614365 UN n k e iuda J Ni Ba ji gt LN T et LI k Ref Part Number Description 130 WN1412 KB30 8 POZI PAN SCREW 165 M3 WASHER S M3 WASHER SHAKEPROOF 175 M3 NYLOC M3 NUT 310 543 428 CABLE TIE 330 2 CABLE BASE 13X13 335 MB3A CABLE TIE BASE 19X19 360 504 978 EARTH LABEL 62 Issue 2 Draft Rev a 614365 ORANGE BROWN RED YELLOW PIN COLOUR 1 ORANGE 2 BROWN 3 RED 4 YELLOW Ref Part Number Description 10 614427 MOTOR MOUNTING PLATE 20 M3X6 POZI PAN M3 SCREW 30 M3 WASHER S M3 WASHER SHAKEPROOF 40 614432 STEPPER MOTOR 60 614428 MOTOR SUPPORT PLATE 70 M3X8 POZI PAN M3 SCREW Issue 2 DRAFT 63 Rev a 614365 Ref BD4000 Part BD4002 Part Description 5 FK20 FK20 EVENT MARKER SOCKET 6 614429 CONNECTOR PANEL EARTH KIT 10 614430 CONNECTOR PANEL METALWORK 20 614431 CONNECTOR PANEL LABEL 30 EGGIB305 CNL EGGIB305 CNL TOCO SOCKET 40 EGGIB307 CNL EGGIB307 CNL ULTRASOUND SOCKET 250 GCA 18 255 LT GCA 1S 255 LT EARTH WASHER 260 GEA 1S 240 LN GEA 1S 240 LN BACK NUT 64 Issue 2 Draft Rev a 614365
22. 47 10 27 Paper Width Microswitch Removal 47 10 28 Paper Width Microswitch Refitting 47 10 29 Front Panel Connector Assembly Removal 47 10 30 Front Panel Connector Assembly refitting 47 10 31 Toco Ultrasound Transducer Dismantling 47 10 32 Reassembiv of Toco Ultrasound Transducer 48 10 33 Strain Gauge Assembly Removal 48 10 34 Strain Gauge Assembly Refitting 48 10 35 Toco Transducer Alignment 49 10 36 Replacing Transducer Cable 52 10 37 Transducer Servicing 53 11 Fault Finding 2025 s sa s r 3E E oen 53 1T Eror CodeS RU C arate oe eh oe Ou EC 55 142 SSrvIGe MO IBS a Sw ee m X ur ey 56 11 3 Displaying Status 56 IA Pint Asad Test mieuna dle Ce SCR 57 TT 5 Bec HUmbel a LOC Ern de debet rb eos 57 11 6 Realtime clock battery 57 ee i e Re dede a 57 12 Spare Parts List 35 gc RERO ux 58 12 1 Recommended Spare 58 13 Warranty And Service 70 14 Overseas Offices 71 15 5
23. 96793 24 hr answer service Fax 029 20492520 E mail serviceWhuntleigh diagnostics co uk 68 Issue 2 Draft Rev a 614365 14 Overseas Offices U S A Huntleigh Healthcare Inc 227 Route 33 East Manalapan New Jersey 07726 U S A Tel 732 446 2500 or toll free 1 800 223 1218 Fax 732 446 1938 Huntleigh Nesbit Evans Healthcare GmbH Im Hiilsenfeld 19 40721 Hilden Germany Tel 0049 2103 9711 00 Fax 0049 2103 9711 80 Australia Huntleigh Healthcare 63 Buckingham Drive PO Box 1116 Wangara W A 6065 Australia Tel 00168 9309 3083 Fax 00168 9309 4582 is a registered trade mark of Huntleigh Technology PLC in the UK As part of the ongoing development programme the company reserves the right to modify specifications and materials of the Baby Dopplex without notice Huntleigh Technology ple 2000 Issue 2 DRAFT 69 Rev a 614365 15 Appendices 15 1 Appendix Special Handling Procedures The PCB assemblies used in the main unit toco FECG and ultrasound transducer contain electrostatic sensitive devices These may be permanently damaged by electrostatic potentials encountered in routine handling of the assemblies during servicing We therefore recommend that all servicing be carried out in a specialised handling area SHA as defined by CECC00015 published by CENELEC to avoid damage to the assemblies A 2 Recommended Soldering Equipment for Rewo
24. BASE MOULDING 20 614393 CHASSIS ASSEMBLY 70 614394 PRINTER MOTOR ASS Y 90 614395 END OF PAPER ASSY 150 WN1412 KB30 8 SELF TAPPING SCREW 155 M3 WASHER S M3 WASHER SHAKEPROOF 160 M3X8 POZI PAN M3X8 SCREW 165 M3 WASHER S M3 WASHER SHAKEPROOF 350 BP190 FOAM PAD Issue 2 DRAFT Rev a 59 614365 Ref BD4000 Part BD4002 Part Description 30 614396 REAR CONNECTOR PCB ASSY 40 614397 CONNECTOR PANEL ASSY 80 614419 614419 PRINT HEAD ASSY 100 614420 614420 WIDTH MICROSWITCH ASSY 105 614421 614421 SPEAKER ASSY 130 WN1412 KB30 10 WN1412 KB30 10 SELF TAPPING SCREW 160 M3X8 POZI PAN M3X8 POZI PAN M3X8 POZIPAN 165 M3 WASHER S M3 WASHER S M3 WASHER SHAKE 170 M3 WASHER M3 WASHER M3 WASHER 250 614422 614422 SPEAKER EARTH ASSY 280 614423 614423 MAINS SOCKET ASSY 295 614424 614424 MAIN PCB WIRE KIT 400 EARTHING FINGERS 60 Issue 2 Draft Rev 614365 Ref BD4000 Part BD4002 Description 50 614425 MAIN PCB ASS Y 110 614433 614433 SWITCH MODE PSU 165 M3 WASHER S M3 WASHER S M3 WASHER SHAKEPROOF 175 M3 NYLOC M3 NYLOC M3 NUT 180 BS 06 32 BS 06 32 BRASS SPACER 181 NS 06 32 NS 06 32 NYLON SPACER 185 M3 WASHER N M3 WASHER N M3 WASHER 195 BS 04 32 BS 04 32 M3 BRASS SPACER 205 BP 23 B M3X10 BP 23 B M3X10 BRASS PILLAR 215 6144
25. Driver further processes the information from the LCD Controller and data bus for the Display LCD Display 32 character display showing system setup and other information Keypad Matrix this interface enables the user to set up and operate the monitor LED Display Driver manipulates the data from the data bus into a form acceptable to the LED displays LED Displays display the Uterine Activity and FHRs 32 Issue 2 Draft Rev a 614365 8 BD4000 BD4002 Transducers 8 1 051 Ultrasound Transducer Sync Gate Carrier 1 5MHz Transmitter Linear Regulator Receiver Range Gate De Modulator Timing Logic is driven by the control and carrier signals fed from the main unit This logic controls the transmitter and receiver range gating Oo o e 5V Regulator the 5V regulator is supplied from the 10V line Range Gate Control is used to reject any unwanted signal caused by reflections and contact noise Transmitter Output the output is pulsed the timing of which is controlled by the timing logic section Range Gate Switching the signal from the ultrasound head is selected by the range gating section to ensure that the receiver circuitry is not enabled during the transmit period this is switched on after a suitable period to reduce unwanted signals Demodulator a reference signal from the main oscillator is used to demodulate the received signal Filter Network the output from the de
26. FECG input socket directly If you require any assistance with safety testing your Huntleigh Diagnostics equipment contact Huntleigh Diagnostics For the U K refer to the Health Equipment Information Document No 95 Code Of Practice For Acceptance Testing Of Medical Equipment The following safety summary should be read before operating or carrying out any of the procedures described in this manual Do not immerse main unit in any liquid See section 2 4 Cautions Do not use the Baby Dopplex in the presence of flammable gases such as anaesthetic agents This product is not designed for sterile use Do not use in the sterile field unless additional barrier precautions are taken use solvent cleaners use high temperature sterilising processes such as autoclaving use E beam or gamma radiation sterilisation 4 Issue 2 Draft Rev a 614365 24 Cleaning Switch the unit off and disconnect from the mains before cleaning Caution Main Unit Ultrasound Transducer and FECG Leg Plate If required this can be wiped with a soft cloth dampened with a mild detergent avoiding the connectors Do not allow any fluid to seep into the connectors Do not allow any fluid to seep into the unit Ensure the unit is completely dry before reconnecting to the mains These should be cleaned by immersing in warm 50 C max mild detergent solution using a bottle brush if necessary Do not soak
27. Standards Complies with BS5724 Part 1 1989 IEC601 1 1988 EN60601 1 1990 12 Issue 2 Draft Rev 614365 EN60601 1 Classification Type of shock protection Class I Degree of shock protection Type B Leg Plate amp IUP Module Type BF Protection Against Ordinary equipment Water Ingress Degree of Safety in PresenceNot suitable for use in the presence of of Flammable Gases flammable gases Mode of Operation Continuous Performance FHR Range US 50 to 210 BPM FECG 30 to 240 BPM FHR Accuracy over full range FHR Scale Options 50 to 210 BPM at 20 BPM em 30 to 240 BPM at 30 BPM em 0088 Medical Devices Directive 93 42 Issue 2 DRAFT 13 Rev a 614365 5 Technical Description 5 1 The Doppler Principle The Baby Dopplex uses the Doppler principle for non invasively monitoring movement within the body The Doppler principle states that if a signal is transmitted at a fixed frequency and is reflected by a moving body the frequency of the received signal will be shifted An increase in frequency results if the reflector is moving towards the transmitter receiver and a decrease results if moving away from the transmitter receiver The amount of frequency shift is proportional to the velocity of the reflector relative to the transmitter receiver In the Dopplex range a fixed frequency ultrasonic signal is transmitted from the transducer into the body This is reflec
28. US signal 15 then low pass filtered and fed to the FMD section for further filtering amplification and also to the high pass filter This bandpass filtered signal is then level controlled then boosted to drive the speaker It is also fed through a sharp low pass anti alias filter before arriving at the AGC input This DAC based stage allows the micro to regulate the ultrasound signal before sampling US Timing Logic the master oscillator for the ultrasound system is also located on the main PCB analogue section This 1 5MHz carrier is first amplified before being fed to the ultrasound transducer and the rear connector PCB The timing logic controlled by the micro sets the ultrasound transmit timing and fully synchronises the system in the twins ultrasound mode FECG the FECG leg plate output signal is low pass filtered then fed to the AGC circuit In FECG mode the ultrasound signal is disabled and the AGC used to regulate the FECG signal amplitude before sampling An unfiltered version of the FECG leg plate output signal is also fed to the micro and sampled Issue 2 DRAFT 19 Rev a 614365 Transducer Type Detect 15 used to differentiate between ultrasound and FECG modes A probe code circuit detects the connection of an ultrasound transducer and signals this to the micro The micro then opens or closes the relevant analogue switches depending on the mode selected to route the appropriate signals through to the A D converters A
29. afety Q Functional and safety checks should always be made after carrying out any repairs or dismantling the equipment It is recommended that regular inspections are to be made to check the integrity of the unit and to ensure cables are not showing any signs of wear or noise when flexed 2 2 Safety Testing Using suitable safety test equipment refer to the following guidelines Earth Bonding Test points a Test the exposed chassis accessible through the moulding apertures on the underside of the unit b Test the metal shroud of the toco socket c Test the shells of the rear panel D type connectors The maximum allowable reading at all points is 0 1 Earth Leakage Test Set the on off switch on the rear of the unit to the on position The maximum allowable leakage current is 100 Breakdown Test Set the on off switch on the rear of the unit to the position Apply 1500Vac to the mains connector connecting the low voltage probe to the EARTH terminal Firstly test the LIVE terminal and then the NEUTRAL for 60 seconds each The maximum allowable reading is Issue 2 DRAFT 3 Rev a 614365 23 FECG Testing Apply 1500Vac between the a chassis earth and leg electrode plate b instrument live terminal and FECG terminals c instrument neutral terminal and FECG terminals The maximum allowable reading being 10 A over 60 secs Caution Do not apply test voltages to main unit
30. ains Inlet Detail Issue 2 DRAFT 43 Rev a 614365 10 195 Removal 1 Remove speaker connector from panel PCB 2 Remove 2 Speaker bracket securing screws lift speaker assembly and earth wire clear of unit 3 Remove 4 speaker securing screws nuts and clamp plates 10 20Speaker Refitting 1 Refitting is reversal of removal tighten screws and nuts to 35cNm 10 21Rear Panel Connector PCB Removal 1 Remove rear panel ribbon cable from main PCB 2 Remove 2 PCB retaining screws 10 22Rear Panel Connector PCB Refitting 1 Place rear panel PCB over mounting pillars ensuring that the earthing fingers are meshed correctly 2 Fit screws and washers tighten to 35cNm Fit ribbon connector to main PCB 44 Issue 2 Draft Rev a 614365 10 23Paper Tray Open Microswitch Removal 1 2 Remove microswitch connector and power supply as detailed in 7 15 Remove microswich and plate securing screws Removing one screw at a time will prevent the securing plate from dropping under the chassis Lift microswitch clear of assembly and clean chassis of sealant 10 24 Tray Open Microswitch Refitting 1 2 5 Place microswitch over securing plate and fit screws loosely With paper tray fully closed adjust microswitch position to register paper tray closed Pull the left hand side of the paper tray gently the unit may display Paper tray open briefly as the paper tray is held under
31. be partial or latent seriously impairing the reliability of the unit Due to the nature of the components used within the Baby Dopplex special precautions must be taken to avoid damage to the circuitry Static damage may not be immediately evident but could cause premature failure The Baby Dopplex must only be dismantled and serviced within an ESD protected area EPA as defined by 00015 published CENELEC to avoid damage to the assemblies 1 5 Construction The main unit comprises five PCB s the main PCB display PCB PSU end of paper PCB and rear panel connector PCB boards with the exception of the PSU populated with surface mounted components The toco transducer consists of a termination PCB and a strain gauge The ultrasound transducer contains a single PCB a multi element piezo crystal array and a circular termination PCB The FECG transducer contains a single PCB and isolation amplifier with two scalp electrode connections and a legplate disk for a maternal connection All electromechanical and through hole components are serviceable using standard tools and soldering techniques provided that anti static precautions are always taken Recommended servicing is limited to replacement of assemblies detailed in this manual 2 Issue 2 Draft Rev 614365 2 Safety Aspects 21 Safety The Baby and its transducers are designed to high standards of performance reliability and s
32. clear Pin No Toco Ultrasound s 1 Orange Red i 2 White White FE 3 Violet Yellow 4 Black Violet 5 Yellow Brown 6 Orange 7 Black 46 Issue 2 Draft Rev a 614365 10 30 Panel Connector Assembly refitting 1 Refitting is the reverse of removal Take care not to damage the earthing fingers Renew cable ties 10 31 Toco Ultrasound Transducer Dismantling 1 Remove the 5 screws from rear of transducer one under label Invert case assembly and lift top clear care should be taken not to lift seal clear at this stage 10 32Reassembly of Toco Ultrasound Transducer Ensure that seal is located in case before fitting transducer top and that seal assembly is fitted correctly 2 Fit transducer top and tighten screws to 20 cNm Replace label Water resistance of US transducers can only be ensured if the units are returned to Huntleigh Diagnostics for refurbishment 10 33Strain Gauge Assembly Removal 1 Remove case top as detailed in 10 31 and desolder grey cable from termination PCB Desolder strain gauge wires from PCB 2 Remove 2 securing screws from strain gauge PCB and lift clear from assembly 10 34Strain Gauge Assembly Refitting l Fit strain gauge assembly noting orientation 2 Solder wires to termination PCB and tighten screws to 40 cNm Solder connector cable to termination PCB Align transducer as per 10 35 Issue
33. contractions or transducer and signals this to the micro 28 Issue 2 Draft Rev a 614365 7 3 BD4002 Power Supply Section Boost Regulator 10v 5 10v oise Regulator 26v H12v Universal Fuses 2 12 Switch Switch and 5v Mode PSU Filter Universal Switch Mode PSU converts standard international mains power down to 5 and 12Vdc Boost Regulator situated on the main board this converts the 12V to 26V for use by the print head and stepper motor Low Noise Regulator a low noise 10V is also produced to power the ultrasound transducers Issue 2 DRAFT 29 Rev a 614365 Stepper Motor 7 4 BD4002 Printer Section Micro controller Strobe Data Temperature Sense Tray Open Paper Size End of Paper Detect Detect Detect Print Head is a solid state thermal array of heater elements that print onto thermally sensitive paper Strobe Control the strobe control varies the strobe width to the print head which regulates the intensity of the printout The strobe width is controlled by the microprocessor Temperature Sense this allows the micro to assess the temperature of the print head by means of a thermistor in the print head This will vary as the monitor prints and with ambient temperature Strobe width is adjusted to regulate print density Stepper Motor Driver processes the information from the data bus and converts this to a form acceptable to the stepper motor Stepp
34. el Issue 2 DRAFT 39 Rev a 614365 10 8 Main PCB Removal 1 Remove print head connector taking care not to short pins together Remove all connectors as shown in fig 12 below 2 Remove 4 nuts and washers at each corner of PCB 10 9 Main PCB Refitting Place PCB over pillars fit washers and nuts as above Torque retaining nuts to 20cNm and fit shakeproof washer under earthing point nut UF BEAR PANEL TANER Lie FRONT POWER ell SUPPLY EVENT II a FAPRE WIDTH ji MICROSWITCH PRINTHEAD sacret FECGMS 8 Fig 12 Connector layout 2 Replace all connectors as above 10 10Print Head Removal 1 Remove print head connector taking care not to short pins Pull out paper tray remove 4 head support plate screws motor support plate and earth lead 2 Remove 2 x M3 nuts from head support plate and lift head support plate clear of head Remove springs and spacers 3 Remove 6 screws head mounting plate and print head connector 40 Issue 2 Draft Rev a 614365 10 11 Print Head Refitting 1 Fit print head connector head mounting plate and tighten 6 screws to 35cNm Ensure that print head is parallel to head mounting plate 2 Place spacers over pillars and springs over spacers 3 Place head support plate over head mounting plate ensuring that metal tongue is located under screw head as fig 13
35. er Motor drives the printer mechanism Paper Width Detector the paper width switch detects if 150mm or 210mm paper is fitted Paper Detector this detects end of paper The printer will stop and a message will appear on the LCD when the paper tray is empty Tray Open Detector detects when the paper tray is open and stops printing Both sides of the paper tray must be latched shut for normal printing 30 Issue 2 Draft Rev a 614365 7 5 BD4002 Rear Panel Section Micro controller Level Converter DUART Dual Universal Asynchronous Receive Transmit controls the data flow to and from the microprocessor and convetts it into a protocol accepted by the RS232 IC Level Converter this converts the data from the DUART into RS232 voltage levels The RS232 link allows data to be passed from and to an external device via the rear panel D type connectors Port 1 for connection to external devices e g NIBP SpO2 monitors Port 2 used for communications with central monitoring stations Issue 2 DRAFT 31 Rev a 614365 7 6 BD4002 Display Alphanumeric Display LCD Keypad Matrix LED Display FHR amp Pulse LCD Driver Micro controller Interface Connector LED Driver Interface Connector is the connector from the main PCB LED Display UA LCD Controller processes the information from the data bus and converts this to a form acceptable to the LCD LCD
36. ernal RAM when the unit 15 reset EEPROM used for storage of user setup information when the unit is switched off 26 Issue 2 Draft Rev a 614365 7 2 BD4002 Analogue Section AGC leg Anti Alias k Band Pass k Differential us Filter Filter Amplifier Power FECG Amplifier SH Low Pass A Filter Volume L Control Low Pass Filter FECG Wideband am controller AGC Anti Alias Band Pass Differential Py US FECG Filter Amplifier Inputs FECG A Low Pass Filter FMD Low Pass FECG Wideband Filter Probe Sync Detect Transducer Type Detect CH2 Differential Amplifier US RF 1 5MHz TOCO dh Amplifier IUP Input Timing Transducer II SYNC Gate Type Detect US FECG Input balanced signals from the ultrasound transducer are fed into the differential amplifier which converts them to single ended mode This is used on both FH1 and FHR2 inputs FHR FHR2 audio outputs are selected from the display panel when both transducers are utilised The US signal is then low pass filtered and fed to the FMD section for further filtering amplification and also to the high pass fi
37. g of controls which may have been altered during maintenance No attempt should be made to service the unit unless adequate workshop facilities and suitable staff are available 2 6 CE marking All rework procedures detailed in this service manual must be strictly adhered to to ensure continuing compliance with EC Directive 93 42 EEC Any rework routine carried out outside the scope of this manual may result in the equipment no longer meeting this specification and the rework organisation will be responsible for this non conformance 6 Issue 2 Draft Rev a 614365 3 Functional Testing 3 1 BD4000 BD4002 Main Unit Switch the unit on by pressing the on off switch at the back of the unit to the on position I The Baby Dopplex displays will illuminate and you will hear a click from the loudspeaker The message Huntleigh Diagnostics appears for an instant while the unit carries out a self test Inspect the transducer cables and plugs for signs of damage and physical condition of the transducers The ultrasound transducer face should be free from marks and the toco boot undamaged Remove any gel from the transducers if present Open printer tray unit should display Paper tray open and remove paper pack Close paper tray unit should display End of paper Refit paper pack ensuring that the shiny side is uppermost This sensitive side can be easily marked with a fingernail Plug in the ultrasound toco and even
38. illed catheter system Refer to user manual for further information Issue 2 DRAFT 15 Rev a 614365 6 BD4000 overview The BD4000 has been split up into several sections as shown below for clarity Serial Ports US FECG Display amp Analogue Control Processing 16 Issue 2 Draft Rev a 614365 6 1 BD4000 Micro Section Display Control Event Marker Micro controller Digital Signal Reset Processor Watchdog Timer DSP Serial Ports ADC Real Time Clock E Probe Analogue RAM em Real Time Clock this enables the micro to display and print the date time on the trace User setup information 15 held within the internal memory of the clock EEPROM Watchdog Timer this monitors the micro and checks for any system errors Upon detecting a system error the micro is reset All controls revert to switch on settings Event Marker this patient event marker records a mark on the printout in a different place from the clinical event marker accessed via the front panel see user manual Serial Ports the rear connector PCB supports two D type RS232 connectors for external interfacing and twins mode communication Display PCB is mounted on the top half of the case moulding and consists of two separate PCBs joined by a short ribbon cable This PCB also carries the system controls ROM the ROM memory contains the program RAM the main PCB has three RAM IC s two are used
39. lder 7 000 Volts Poly bag lifted from bench 20 000 Volts Foam padded work chair 18 000 Volts Static electricity is generated very easily and 15 only felt by us when we discharge the built up charge rapidly by touching a grounded object such as a grounded door handle The voltages felt by us are as high as 3kV but only 20V is necessary to damage some components Voltages as high as 35kV and current spikes of 40A have been known The damage to the component or assembly can be immediate or latent Latent damage is not immediately obvious but can lead to the circuitry subsequently failing or becoming erratic 9 2 Protective Measures To protect devices ESDs from the unwanted effects of ESD two key measures must be taken to minimise the possibility of damage 1 sensitive devices and assemblies must be handled in an ESD Protected Area EPA 2 All sensitive devices and assemblies must be transported in a protected state For further information on static precautions and soldering equipment refer to Appendix A 36 Issue 2 Draft Rev 614365 10 Servicing Procedures Main Unit Due to the complexity of the product and the use of surface mount technology the electronic circuitry 15 not serviceable without specialised training and equipment The repairs detailed in this manual are therefore limited to replacement of certain parts Fault finding 15 limited to checking for the presence or absence of signals
40. lter This bandpass filtered signal 5 then level controlled then boosted to drive the speaker It is also fed through a sharp low pass anti alias filter before arriving at the AGC input This DAC based stage allows the micro to regulate the ultrasound signal before sampling US Timing Logic the master oscillator for the ultrasound system is also located on the main PCB analogue section This 1 5MHz carrier is first amplified before being fed to the ultrasound transducers FECG the FECG leg plate output signal is low pass filtered then fed to AGC circuit In FECG mode the ultrasound signal is disabled and the AGC used to regulate the FECG signal amplitude before sampling Issue 2 DRAFT 27 Rev a 614365 Transducer Type Detect 15 used to differentiate between ultrasound and FECG modes A probe code circuit detects the connection of an ultrasound transducer and signals this to the micro The micro then opens or closes the relevant analogue switches depending on the mode selected to route the appropriate signals through to the A D converters Probe Detect detects the presence of one or two US FECG transducers allowing the micro to monitor the correct channels as required Toco IUP Input a differential amplifier converts the balanced output from the transducer to single ended mode suitable for micro A D sampling A sense line detects when an IUP system is connected A probe code circuit detects the connection of an external
41. modulator is low pass filtered to remove any unwanted noise Output Buffers to minimise noise a balanced output is used Ultrasound Faceplate comprises a multi element array with 7 crystals connected in parallel Issue 2 DRAFT 33 Rev a 614365 8 2 FECG Leg Plate Unfiltered FECG Signal FECG Conditioning Power 10 Amplifier Isolation E Amplifier P wer Supply Scalp Electrodes Isolation Patient Connections these follow the standard three node connection pattern commonly used in FECG monitoring Instrumentation Amplifier this is used to amplify the FECG signal An instrumentation amplifier is used as it is very important that this stage has a very high common mode rejection ratio due to the small FECG signal that is presented with large common mode noise and maternal signals Isolation Amplifier to maintain patient safety should an electrical fault occur an isolation amplifier is used as a barrier to avoid excess leakage through to the patient Power Supply this is used to provide a 15V supply to the isolation amplifier A 5V supply is derived from the 10V input The 5V supply is used in conjunction with the 10V line to provide the isolation amplifier with the 15V required Signal Conditioning is used to smooth and amplify the signal from the Isolation amplifier for further processing by the main unit The unfiltered signal from the isolation amplifier is also pr
42. on the Digital Signal Processing section and the third for data processing by the micro Digital Signal Processor processes the information from the ultrasound and ECG transducers implementing autocorrelation and ECG detection for deriving the FHR Issue 2 DRAFT 17 Rev a 614365 DSP Bootup this circuitry loads the DSP program from EPROM to the DSP s internal RAM when the unit is reset EEPROM used for storage of user setup information when the unit is switched off Twins Detect a link in the cable sets the monitor to twins mode 18 Issue 2 Draft Rev a 614365 6 2 BD4000 Analogue Section Power Amplifier Gain Volume Control Control Anti Ali Band P Differential S FECG controller AGC nti jas 4 and Pass ifferentia PSS U Filter Filter Amplifier Input FMD Low Pass Filter Low Pass Filter FECG Wideband Transducer Type Detect Osc RF 1 5 2 Serial Ports ff f US PFP Amplifier Timing MPA SYNC Gate SYNC Logic Gate Differential r Amplifier TOCO Input Transducer k Type Detect US FECG Input balanced signals from the ultrasound transducer are fed Into the differential amplifier which converts them to single ended mode The
43. onic circuitry digital and analogue signal processing audio display and power supply systems Signals from the transducers are processed and displayed on the large LED displays The ultrasound signal is also amplified and output via the integral loudspeaker A volume control provides adjustment of sound level as required Processing for the FECG signal is also included A liquid crystal display LCD displays the system menu and other information Various parameters can be selected and or changed as necessary using the adjacent controls Also mounted on the control panel are controls for volume up down print start stop Toco zero and clinical event marker Issue 2 DRAFT 1 Rev 614365 Transducers The transducer connectors are colour coded to indicate function the US FECG connector is red the Toco connector is blue The transducers are held in place by elasticated straps Patient Event Marker This is a hand held push button which is pressed by the patient when she feels fetal or uterine activity The patient and clinical event markers are distinguished from each other on the paper patient at the bottom of the FHR grid and clinical at the top 1 4 Antistatic Handling Electro Static Discharge ESD The Baby Dopplex uses Electrostatic Discharge Sensitive Devices ESD s in its manufacture The damage they suffer when handled incorrectly may be catastrophic More often and potentially even worse the damage may
44. ound transducers when connected in twins mode Port 1 when used in twins configuration sets unit to Local mode by monitoring Twins Detect US timing is set by Remote unit and FHR information is received from the Remote unit Port 2 when used in twins configuration sets unit to Remote US timing of Local unit is set by Remote unit and FHR information sent to the Local unit for display and printing Issue 2 DRAFT 23 Rev a 614365 6 6 BD4000 Display Alphanumeric Display LCD Keypad Matrix LED Display FHR amp Pulse LCD Driver Micro controller Interface Connector LED Driver Interface Connector is the connector from the main PCB LED Display UA LCD Controller processes the information from the data bus and converts this to a form acceptable to the LCD LCD Driver further processes the information from the LCD Controller and data bus for the Display LCD Display 32 character display showing system setup and other information Keypad Matrix this interface enables the user to set up and operate the monitor LED Display Driver manipulates the data from the data bus into a form acceptable to the LED display LED Displays display the Uterine Activity and FHR 24 Issue 2 Draft Rev a 614365 7 BD4002 overview The BD4002 has been split up into several sections as shown below for clarity Issue 2 DRAFT 25 Rev
45. ovided 34 Issue 2 Draft Rev 614365 8 3 IUP Module Tracking Regulator Power 5v Supply 5 2 BE 2 5v ye Reference 25 x 6 O Amplifier Driver _Opto Amplifier Differential E Coupler Outputs Isolation Power Supply provides an isolated supply to the ampifier and electronics in the patient connected part of the IUP system for patient safety 2 5V Reference is used to power the opto isolator Amplifier provides amplification of the siganl recieved from the IUP pressure transducer and is fed to the driver for transfer over the opto isolated barrier via the opto coupler The second amplifier provides an amplified signal with differential outputs for the fetal monitor to interprete and display Issue 2 DRAFT 35 Rev a 614365 9 Electrostatic Discharge ESD Precautions 9 1 What is Static Electricity Static electricity is generated when two materials move against one another The voltage generated depends on the materials generating the electricity the speed of movement humidity and rate of discharge All man made materials generate static such as plastic coffee cups plastic bags binders and folders all of which are likely to be within the working area Activity 10 20 Relative Humidity Walking across carpet 35 000 Volts Walking across vinyl floor 12 000 Volts Working at bench 6 000 Volts Plastic fo
46. pare parts are marked with a bold part number 56 Issue 2 Draft Rev a 614365 a Ref BD4000 Part BD4002 Part Description 10 614384 DISPLAV PCB 30 614385 614385 TOP COVER MOULDING 40 M3 NUT M3 NUT M3 NUT 50 M3 WASHER M3 WASHER M3 WASHER 55 M3 WASHER N M3 WASHER N M3 WASHER NYLON 60 614386 DISPLAY PANEL LABEL 70 614387 REAR PANEL LABEL 80 614389 DISPLAY PANEL METALWORK 90 BS 7 5 32 5 7 5 32 SPACER 100 5 10 5 32 5 10 5 32 SPACER 110 M3 WASHER S M3 WASHER S M3 WASHER SHAKEPROOF 120 614388 DISPLAY EARTH ASSY Issue 2 DRAFT 57 Rev a Z ys a 15 fan a Z p840 x 51 o X A F y 100 250 58 60Hz E 2 250V SERALNo g L MODELNO 804006 614365 UJ eoo feno E MADE UK 7 Ref BD4000 Part BD4002 Part Description 15 614390 614390 CASE BASE MOULDING 120 151321 151321 RUBBER FOOT 200 614391 BASE LABEL SET 340 CL 117 619 CL 117 619 SERIAL NUMBER LABEL 58 Issue 2 Draft Rev a 614365 Ref Part Number Description 10 614392 PAPER TRAY ASSY 15 614390
47. rk The following should be used for all soldering operations carried out on any Dopplex product in servicing Soldering Iron Mini type iron temperature controlled to 3759 with fine tip typically 0 8mm 1 32 earth bonded e g Weller EC3 100D ESP Solder SN62 type solder with multi cored flux type RA conforming to 5 571 US federal specification e g Multicore smart wire If further information is required please contact Huntleigh Diagnostics 70 Issue 2 Draft Rev a 614365 15 2 Appendix Torque Settings cNm Display Panel Metalwork to case 35 Display PCB 35 Print Head Mounting Plate 100 Print Head Support Nuts 35 Print Head Support Screws 35 Stepper Motor to Bracket 100 Stepper Motor Bracket to Base 100 Main PCB 25 Chassis 60 PSU 60 Speaker Bracket Screws 60 Speaker Bracket Nuts 35 Rear Panel PCB 35 Paper Tray Microswitch Plate 20 Case Lid Screws 45 Transducer Top 20 US Toco PCB 40 Paper width microswitch 20 Issue 2 DRAFT Rev 71
48. s anti aliasing filter The signal is then sampled by the microcontroller in order to calculate the fetal heart rate 5 4 Fetal Movement Detection FMD The BD4000 and BD4002 will annotate the fetal heart trace towards the top of the contraction channel when a fetal movement 15 detected This movement is derived from low frequency Doppler signals from the Ultrasound Transducer The FMD can be enabled via the front panel and its sensitivity set Refer to the user manual for further information 5 5 FECG As an alternative to using ultrasound to monitor FHR a FECG scalp electrode may be used This makes a direct connection to the fetal scalp and provides more reliable tracking of the fetal heart rate during the later stages of labour The FECG transducer incorporates an isolation amplifier which provides electrical isolation between the patient and the monitor 5 6 IUP In some markets Intra Uterine Pressure measurements are made as an alternative to the external Toco transducer supplied as standard Patient electrical isolation is provided by an adaptor box plugged into the Toco socket and a corresponding waveform is printed on the contractions trace either shown in millimetres of Mercury mmHg or kiloPascals kPa The pressure sensor is either inserted directly into the mother using the Intran Plus IUP 400 Disposable System Utah Medical Products inc Alternatively using the SensoNor SP844 pressure sensor and a saline f
49. t marker transducers set the printer to 3cm minute menu option and start the unit printing Press the patient event marker switch and observe the arrow at the bottom of the printout Press the clinical event marker on the display panel and an arrow should appear at the top of the printout Increase the volume using the up down controls on the front panel and flex cable on the ultrasound transducer at the transducer and plug ends checking that no crackling is heard Replace the ultrasound transducer with the FECG leg plate The unit should fast feed for a few seconds if the printer is still running when the ultrasound transducer is removed and then continue printing Ensure that the FECG text appears at the bottom of the FHR scale on the trace 3 2 Ultrasound Transducers Reconnect the ultrasound transducer and input a signal by placing it in the palm of the hand and stroke the back of the hand approximately twice per second The display should indicate a rate of around 120 BPM after a few seconds Continue this for one minute and check for a corresponding line on the fetal heart rate trace strong a signal from an adult heart can overload the unit and result in false counting Issue 2 DRAFT 7 Rev a 614365 The signal quality will vary during this test and can be observed the top right hand corner of the LCD display The four bands are illuminated for a good signal and progressively extinguish as the signal
50. ted from for example the fetal heart The signal is reflected from the heart and is received by the transducer Due to the movement of the fetal heart a frequency shift results which is proportional to the fetal heart velocity 5 2 Doppler Audio Processing The Baby Dopplex ultrasound transducer contains a transmitter and receiver In use the transducer sends out a pulsed ultrasonic signal generated by the piezo ceramic transmitter crystals at 1 5 MHz This signal is scattered by blood cells or any other interface such as skin muscle layers organs walls of vessels etc A small proportion of the scattered signal will be reflected back and detected by the receiver By demodulating the received signal removing the high frequency carrier the Doppler shifted component the difference between the transmitted and received signals can be produced With typical target velocities found in the human body this Doppler shift signal falls within the audio frequency range It can therefore simply be amplified and heard through a loudspeaker It is important to remember that the sound you hear 15 an artificial sound the frequency pitch of which is proportional to the velocity of the moving target It is not the real sound made by the fetal heart 14 Issue 2 Draft Rev a 614365 53 Heart Rate Processing The Doppler audio signal is amplified and filtered It s amplitude is then regulated after passing through a low pas
51. tension this message must disappear when released The switch must detect as soon as the left hand side catch is depressed and the tray released Tighten microswitch securing screws to 35cNm 10 25Paper Tray Removal 1 Remove Power Supply PCB as 7 15 Remove 6 chassis mounting screws and disconnect stepper motor plug 2 Remove print head support plate as detailed in 7 10 steps 1 2 Cont d Issue 2 DRAFT 45 Rev a 614365 3 Lift print head assembly and chassis from inside paper tray Pull paper tray forward clear of assembly 10 26Paper Tray Refitting 1 Lift print head assembly and chassis Insert paper tray ensuring that the paper tray is located within the base tray guide 2 Carefully refit chassis screws and tighten to 60cNm seal with M Coat D Refit Power Supply Unit as detailed in 7 16 Align microswitch as detailed in 7 24 3 Refit print head support plate as per 7 11 step 5 and align print head as detailed in 7 12 10 27Paper Width Microswitch Removal 1 Remove main PCB as detailed in section 7 8 Remove 2 securing nuts washer and lift switch clear of assembly 10 28Paper Width Microswitch Refitting 1 Refitting is the reversal of removal ensuring paper tray is fully open during refitting procedure 10 29Front Panel Connector Assembly Removal 1 Remove event marker toco and US FECG connectors from the main board and remove cable ties 2 Lift front panel connector assembly
52. ts and with ambient temperature Strobe width is adjusted to regulate print density Stepper Motor Driver processes the information from the data bus and converts this to a form acceptable to the stepper motor Stepper Motor drives the printer mechanism Paper Width Detector the paper width switch detects if 150mm or 210mm paper is fitted Paper Detector this detects end of paper The printer will stop and a message will appear on the LCD when the paper tray is empty Tray Open Detector detects when the paper tray is open and stops printing Both sides of the paper tray must be latched shut for normal printing 22 Issue 2 Draft Rev a 614365 6 5 BD4000 Rear Panel Section Twins Detect DUART Level Micro controller SYNC Gate In Analogue Processing SYNC Gate Out DUART Dual Universal Asynchronous Receive Transmit controls the data flow to and from the microprocessor and converts it into a protocol accepted by the RS232 Level Converter this converts the data from the DUART into RS232 voltage levels The RS232 link allows data to be passed from and to an external device via the rear panel D tvpe connectors Twins Detect detects when the twins lead connector marked 1 is connected to place the unit into twins mode LOCAL The BD4000 connected to the other end of the twins cable becomes the REMOTE untt Svnchronisation signals synchronises the two ultras
53. urn unit over and carefully raise the top case half Unplug front panel ribbon cable and place case half to one side avoiding strain to the earth wire 10 3 Unit Reassembly Ensuring that front panel ribbon cable and safety earths are fitted locate top case over speaker and front panel alignment guides 2 Invert unit and refit 5 securing screws and tighten to 45cNm 10 4 Display Front Panel Switch PCBs Removal 1 Dismantle unit as previously detailed in 7 2 2 Remove 6 nuts from front panel switch PCB 3 nuts from display PCB and their nylon washers 3 Carefully lift PCBs and earth wire see Fig 11 clear from case assembly 10 5 Display PCBs Refitting Place PCBs over pillars fit nylon washers and torque nuts to 20cNm 38 Issue 2 Draft Rev a 614365 ll A EL Fig 6 Front Panel Removal 0 6 Displav PCB Metalwork Removal Remove Display PCBs as detailed in 7 4 Remove nvlon washers and spacers from pillars Remove remaining 4 retaining nuts and metal washers from metalwork The front panel metalwork can now be pushed through case moulding cut out and the label removed 10 7 Refitting Displav PCB Metalwork With case top uppermost place metalwork in cut out 2 Turn case top over fit metal washers earth lead see Fig 11 and securing nuts as shown 3 Fi washers as Fig 11 and refit display PCBs as detailed in 7 5 4 Check switch caps LCDs LEDs are flush with metalwork fit lab
54. ween 25 V and 2mV Only one FECG transducer can be used at any one time Use of an adult ECG simulator may cause erroneous readings The ECG rate should be set between 30 240 and checked across its range 3 5 Twins Functional Testing BD4000 Connect two BD4000 units together using the connection lead supplied with the twins kit The monitor with the cable end marked 1 causes the unit to be the LOCAL unit while the other unit defaults to REMOTE The display on the LOCAL BD4000 should display Remote FHR in the top line of the text display Connect an ultrasound transducer to both units and input a signal on the REMOTE unit by stroking the ultrasound transducer The REMOTE unit LCD should display Twins Remote Unit and the printer should be inoperative The FHR should be displayed on both the REMOTE LED and LOCAL LCD displays Set the printer on the LOCAL unit to print and with a signal to the REMOTE unit a corresponding trace should be printed When full width paper 210mm is loaded the LOCAL unit will print two FHR grids one above the other and one toco trace With the normal paper 150mm fitted the two FHR traces are overlaid on one grid and identified periodically by the letters R and L Issue 2 DRAFT 9 Rev a US TDR MOVED Local FECG 12 29 26 5 98 3 cm m 100 HUNTLEIGH DIAGNOSTICS 210mm paper wide 10 614365 US TDR MOVED BPM E oe ERIT DIETE TOME ias 60 iRemote US
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