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7.2

BD4002 Analogue Section

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 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 transducers.

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.

Issue: 2 DRAFT

Rev: a

614365

Power

Amplifier

Anti Alias

Filter

AGC

Micro-

controller

Volume

Control

Low Pass

Filter

FMD

Band Pass

Filter

US/FECG

Inputs

Transducer

Type Detect

Gain

Control

Differential

Amplifier

FECG

Low Pass

Filter

Amplifier

1.5MHz

SYNC/Gate

Logic

TOCO /

IUP Input

Transducer

Type Detect

Differential

Amplifier

FECG Wideband

Probe

Detect

Sync

Anti Alias

Filter

AGC

Low Pass

Filter

Band Pass

Filter

Differential

Amplifier

FECG

Low Pass

Filter

CH1

CH2

CH1

FMD

CH2

Timing

FECG Wideband

Содержание Baby DOPPLEX 4000

Страница 1: ...reproduced in part or in whole without written consent Huntleigh Diagnostics Ltd products are subject to continuous development and consequently may incorporate minor changes from the information con...

Страница 2: ...al Testing 7 3 1 BD4000 BD4002 Main Unit 7 3 2 Ultrasound Transducers 7 3 3 Toco 8 3 4 FECG Functional Testing 9 3 5 Twins Functional Testing BD4000 9 3 6 Twins Functional Testing BD4002 11 4 Specific...

Страница 3: ...ions 35 9 1 What is Static Electricity 35 9 2 Protective Measures 35 10 Servicing Procedures Main Unit 36 10 1 Torque Settings 36 10 2 Unit Dismantling 37 10 3 Unit Reassembly 37 10 4 Display Front Pa...

Страница 4: ...val 47 10 30 Front Panel Connector Assembly refitting 47 10 31 Toco Ultrasound Transducer Dismantling 47 10 32 Reassembly of Toco Ultrasound Transducer 48 10 33 Strain Gauge Assembly Removal 48 10 34...

Страница 5: ...15 1 Appendix A 72 15 2 Appendix B 73 iv Issue 2 Draft Rev a 614365...

Страница 6: ...or 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 Toc...

Страница 7: ...id 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 defi...

Страница 8: ...h 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...

Страница 9: ...Of Medical Equipment The following safety summary should be read before operating or carrying out any of the procedures described in this manual 4 Issue 2 Draft Rev a 614365 Caution Do not apply test...

Страница 10: ...the connector Do not allow any fluid to seep into the transducer Dry thoroughly before use Belts These may be hand washed at 40o C max using a mild detergent solution Rinse with clean water and dry th...

Страница 11: ...r the correct setting 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...

Страница 12: ...ng 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...

Страница 13: ...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 boo...

Страница 14: ...plied 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...

Страница 15: ...10 Issue 2 Draft Rev a 614365 150mm paper normal 210mm paper wide...

Страница 16: ...ansducer 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...

Страница 17: ...io Power 1 Watt max Ultrasound Transducer Transmitter frequency US1 1 5MHz 1 Acoustic Output Under the requirements laid down in IEC1157 1992 the peak negative acoustic pressure does not exceed 1MPa t...

Страница 18: ...gress 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...

Страница 19: ...ch 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 ultrason...

Страница 20: ...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 whic...

Страница 21: ...6 BD4000 overview The BD4000 has been split up into several sections as shown below for clarity 16 Issue 2 Draft Rev a 614365...

Страница 22: ...ront 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...

Страница 23: ...rogram 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...

Страница 24: ...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...

Страница 25: ...oses the relevant analogue switches depending on the mode selected to route the appropriate signals through to the A D converters A similar system is used to detect IUP Toco transducers Toco IUP Input...

Страница 26: ...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 ult...

Страница 27: ...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...

Страница 28: ...he unit into twins mode LOCAL The BD4000 connected to the other end of the twins cable becomes the REMOTE unit Synchronisation signals synchronises the two ultrasound transducers when connected in twi...

Страница 29: ...esses 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...

Страница 30: ...7 BD4002 overview The BD4002 has been split up into several sections as shown below for clarity Issue 2 DRAFT 25 Rev a 614365...

Страница 31: ...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 syste...

Страница 32: ...ing 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 th...

Страница 33: ...s 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 amplifi...

Страница 34: ...ternational 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 a...

Страница 35: ...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...

Страница 36: ...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 connec...

Страница 37: ...sses 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 s...

Страница 38: ...ming 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...

Страница 39: ...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...

Страница 40: ...he 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 dif...

Страница 41: ...sily and is 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 necess...

Страница 42: ...ssemblies 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...

Страница 43: ...le 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 Remova...

Страница 44: ...be pushed through case moulding cut out and the label removed 10 7 Refitting Display PCB Metalwork 1 With case top uppermost place metalwork in cut out 2 Turn case top over fit metal washers earth lea...

Страница 45: ...cNm and fit shakeproof washer under earthing point nut 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...

Страница 46: ...d 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 Alignment Procedure 1 With prin...

Страница 47: ...tor mounting plate screws and remove mounting plate 10 14Stepper Motor Refitting 1 Fit Stepper motor to mounting plate passing gear through mounting bracket noting cable orientation and tighten screws...

Страница 48: ...e power supply 10 17Mains Inlet Removal 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 Refittin...

Страница 49: ...tting 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...

Страница 50: ...r tray fully closed adjust microswitch position to register paper tray closed 3 Pull the left hand side of the paper tray gently the unit may display Paper tray open briefly as the paper tray is held...

Страница 51: ...tep 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 28Pa...

Страница 52: ...fitted correctly 2 Fit transducer top and tighten screws to 20 cNm Replace label F Water resistance of US transducers can only be ensured if the units are returned to Huntleigh Diagnostics for refurbi...

Страница 53: ...e case top as detailed in 10 31 2 Set up power supply voltage to 5 00Vd c 0 05V 3 Connect transducer to power supply and DVM as shown in table above 4 Turn transducer so that strain gauge is uppermost...

Страница 54: ...and link B intact Replace Zero resistor with new value as required to bring the offset within specification If offset negative check link A is intact and link B is cut Repair cut link with tinned copp...

Страница 55: ...ransducer Cable 1 Remove case top as detailed in 10 31 and desolder cable from PCB 2 Unscrew back of metal plug and pull insert free Desolder wires and remove plug from cable 3 Fit plug shroud to cabl...

Страница 56: ...nt 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 614365 Pin Number Toco U...

Страница 57: ...nnel 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 fingerna...

Страница 58: ...No Description Comment 1 PCB S No date of manufacture Factory preset 2 Software version Factory preset 3 Language 1 English Scale 20 beats cm grid on Chart 3cm min Mode internal use only User selecta...

Страница 59: ...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 Th...

Страница 60: ...Bed number During normal operation the bed number is 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 batte...

Страница 61: ...pare parts can be ordered from your dealer or direct from Huntleigh Diagnostics using the part numbers shown overleaf 12 1 Recommended Spare Parts Recommended spare parts are marked with a bold part n...

Страница 62: ...SHER 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 BS 7 5 32 SPACER 100 BS 10 5...

Страница 63: ...2 Draft Rev a 614365 340 200 15 120 4 340 Huntleigh DIAGNOSTICS 35 Portmanmoor Road Cardiff CF2 2HB MADE IN UK Tel 44 0 1222 485885 Fax 44 0 1222 492520 MODEL No SERIAL No geprufte sicherheit Huntleig...

Страница 64: ...NG 20 614393 CHASSIS ASSEMBLY 70 614394 PRINTER MOTOR ASSY 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 WAS...

Страница 65: ...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 WASH...

Страница 66: ...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 SP...

Страница 67: ...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 MB2A CABLE TIE BASE 13X13 335 MB3A CABLE TIE BASE 19X19 360 504 978 EARTH LABEL 62...

Страница 68: ...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...

Страница 69: ...R PANEL EARTH KIT 10 614430 CONNECTOR PANEL METALWORK 20 614431 CONNECTOR PANEL LABEL 30 EGG1B305 CNL EGG1B305 CNL TOCO SOCKET 40 EGG1B307 CNL EGG1B307 CNL ULTRASOUND SOCKET 250 GCA 1S 255 LT GCA 1S 2...

Страница 70: ...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 6...

Страница 71: ...614405 US1 SERIAL NO 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 S...

Страница 72: ...70 M2 5X8 POZI PAN M2 5X8 POZI PAN M2 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...

Страница 73: ...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 mod...

Страница 74: ...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 Dopplex is a registered trade...

Страница 75: ...A as defined by CECC00015 published by CENELEC to avoid damage to the assemblies A 2 Recommended Soldering Equipment for Rework The following should be used for all soldering operations carried out on...

Страница 76: ...ts 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 Pape...

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