Huntleigh D900-P Service Manual
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Huntleigh D900-P Service Manual

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HIGH SENSITIVITY
POCKET DOPPLERS
SERVICE MANUAL
© Huntleigh Healthcare Limited 2004-2009
726374-3 3
Service Agreements
Periodic inspection is essential to ensure continued effective operation. Contact the Company
or its approved agents or distributors for further information on service contracts.
® and ™ are trademarks of Huntleigh Technology Limited
As our policy is one of continuous improvement, we reserve the right to modify designs without prior
notice.
R
...with people in mind

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Summary of Contents for Huntleigh D900-P

  • Page 1 Periodic inspection is essential to ensure continued effective operation. Contact the Company or its approved agents or distributors for further information on service contracts. ® and ™ are trademarks of Huntleigh Technology Limited As our policy is one of continuous improvement, we reserve the right to modify designs without prior notice.

  • Page 2: Table Of Contents

    Manual Mode FHR ........... . .13 4.15 Audio Dopplex (D920-P , D930-P), Mini Dopplex (D900-P) ..... . .14 4.16 FD2-P , SD2-P , MD2-P , FD1-P , FD3-P , RD2 .
  • Page 3 D900-P Parts List ........

  • Page 4: General Information

    (refer to user manual for further details). Description The Dopplex range of products includes the D920-P , D930-P , D900-P , FD2-P (Obstetric Doppler with heart rate display) SD2-P (dedicated vascular Doppler), MD2-P (Bi-directional vascular...

  • Page 5: Antistatic Handling

    MD2-P with the addition of a Photoplethysmographic sensor. For further details on the controls of the D900-P , D920-P , D930-P , FD2-P , SD2-P , MD2-P , FD1-P , FD3-P and RD2 units, please refer to the user manuals.

  • Page 6: Safety Aspects

    Cautions Do not use the D900-P , D920-P D930-P , FD2-P , SD2-P , MD2-P , FD1-P , FD3-P , RD2 units 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.

  • Page 7: General Care And Cleaning

    Co o upl l i i ng Ge e l l The use of water based gel supplied by Huntleigh Healthcare is strongly recommended. Oil based gels can damage the probe and must not be used. The use of oil based gels will invalidate your warranty.

  • Page 8: Specifications

    3. Specifications Safety Type of f protecti i on Class 1 (when operated via the supplied PSU) / internally powered. agai i nst el l ectri i c sh h ock k . Degree of f protecti i on Type B applied part agai i nst el l ectri i c sh h ock k Mode of f operati i on.

  • Page 9: Auto Shut Off

    Symbol Description Indicates Standard FHR Mode Selected (FD1-P , FD3-P , FD2-P , MD2-P only). Indicates Smoothed FHR Mode Selected (FD1-P , FD3-P , FD2-P , MD2-P only). Indicates Manual FHR Mode Selected (FD1-P , FD3-P , FD2-P , MD2-P only). Represents Bi-directional blood flow velocity.

  • Page 10: Outputs

    Probes D900-P P , FD2 2 -P P , SD2 2 -P P , MD2 2 -P P , OP2HS, OP3HS Obstetric Probes RD2 2 (i i n a a d d d d i i ti i o o n to o PPG)

  • Page 11: Technical Description

    4. Technical Description The Doppler Principle The Dopplex Range all use a technique based on 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.

  • Page 12: Probe Identification

    Probe Identification Probe identification is utilised on the D900-P , FD2-P , SD2-P , MD2-P and RD2 Doppler units. This is to allow the control unit to identify which probe has been fitted. Fitting an obstetric probe will disable the waveform output(s).

  • Page 13: Ppg

    4.12 Microcontrollers The D900-P , D920-P , D930-P , FD2-P , SD2-P , MD2-P , FD1-P , FD3-P and RD2 units use a 4 bit microcontroller to carry out "house keeping" duties, such as driving the LCD display and auto shut-off timer.

  • Page 14: Audio Dopplex (D920-P , D930-P), Mini Dopplex (D900-P)

    4.15 Audio Dopplex (D920-P , D930-P), Mini Dopplex (D900-P) Block Diagram Soft Audio Limiter Amplifier Speaker Supply Ground Zero * Probe * Crossing Identification Detector Waveform * Reset Output Microcontroller Battery Display Monitor Split rail Battery Generator On/Off Switch * Mini Dopplex Only...
  • Page 15 The output signal is fed to the loudspeaker, via the switched headphone socket. On start up there is a delay in the supply of power to the audio amplifier. This allows the circuit to stabilise. Zero Crossing Detector (D900-P) A zero crossing detector converts the Doppler signal to a corresponding pulse train. This is then fed to the microcontroller which outputs a pulse position modulated signal which is low pass filtered to produce the waveform output voltage.

  • Page 16: Fd2-P , Sd2-P , Md2-P , Fd1-P , Fd3-P , Rd2

    4.16 FD2-P , SD2-P , MD2-P , FD1-P , FD3-P , RD2 Block Diagram Soft All Pass Limiter Network Stereo* Flow* Power Sense Separation Amplifier Soft* All Pass* ANR* Network Limiter FHR^^ Automatic Signal Gain ^^ Cond. Control Zero* Tare^ Gain^ Crossers Supply...
  • Page 17 Power Supply The power supply regulates the battery voltage and provides +5Vdc to the microcontroller and all circuitry apart from the audio power amplifier which is supplied directly from the battery. The power supply is activated by the on/off switch. The supply is firstly turned on by the on/off switch and then the microcontroller takes over and keeps the power supply on, turning the supply off when the auto shut off time has elapsed or the on/off switch is depressed a second time.
  • Page 18 Zero Crossing Detector (SD2-P , MD2-P , RD2) Two zero crossing detectors convert the Doppler signals to corresponding pulse trains. The pulse trains are then fed to the microcontroller which converts them to pulse width modulated signals which are then filtered to produce the waveform output voltages. Split Rail Generator The split rail generator is necessary to bias the amplifiers correctly to allow linear operation.

  • Page 19: Obstetric Probe (Op2Hs, Op3Hs, D920-P , D930-P , Fd1-P , Fd3-P)

    Gain A small amount of gain is applied to the incoming PPG signal to ensure that the Microcontroller is functioning at its maximum resolution. This signal is multiplexed with data relating to the infra red intensity. Tare The Tare line from the Microcontroller is sent to the PPG pod, this will reset the DC level at the output from the probe and start the test.

  • Page 20: Vascular Probe (Vp4Hs, Vp5Hs, Vp8Hs, Vp10Hs, Ez8)

    Amplifier/Filter The amplifier/filter amplifies the signal from the demodulator stage and removes unwanted noise. The probe has a filter response tailored to maximise the output signal and minimise noise and overload. Probe Coding This superimposes a DC level (depending on probe frequency) onto the output signal. 4.18 Vascular Probe (VP4HS, VP5HS, VP8HS, VP10HS, EZ8) Block Diagram Probe Head...

  • Page 21: Ppg Probe

    Demodulators The demodulators effectively remove the carrier (transmitter frequency), which leaves the Doppler shifted signals. They have two quadrature reference signals from the Johnson Counter stage. Amplifier/Filters The amplifier/filters amplify the signal from the demodulator stages and remove unwanted noise. Each probe frequency has filters whose response is tailored to maximise the output signal and minimise noise and overload.
  • Page 22 Differential Amplifier-1 The Differential Amplifier is used to remove the majority of the dc offset from the input amplifier. This is necessary as the dc signal from the Photodiode is much larger than the change that is to be studied. Window Comparator This monitors the incoming signal and is used to inhibit the clock when the signal is within the ranges preset.

  • Page 23: Electrostatic Discharge (Esd) Precaution

    5. Electrostatic Discharge (ESD) Precautions 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.

  • Page 24: Servicing Procedures - Control Unit

    6. Servicing Procedures - Control Unit Due to the complexity of the product and the use of surface mount technology, the electronic circuitry is not serviceable without specialised training and equipment. The repairs detailed in this manual are therefore limited to replacement of certain parts in the control unit, and replacement of probe heads only.

  • Page 25: Pcb Removal

    2. Fit the new display taking care to avoid stressing the display or bending the legs. 3. Remove protective film. LCD Replacement (D920-P , D930-P , D900-P) 1. Cut off LCD legs, noting orientation and position in the socket (centred with spare hole at each end).

  • Page 26: Control Unit Reassembly

    Retractile Cable - Control Unit 1. Carefully de-solder the retractile cable using solder wick, leaving the holes clear to fit the new cable (See figures 1,2 and 3). Cable Refitting 1. Fit new cable to control unit as described previously. Volume Control 1.
  • Page 27 8. Replace the 4 fixing screws, and tighten them to a torque setting of 60cNm. 9. Replace battery and access cover. After any repair work or dismantling, the unit should always be fully tested, checking that all functions operate correctly as described in the user manual. Figure 1 D900-P Exploded View White Violet Orange...
  • Page 28 Figure 2 D920-P , D930-P Exploded View Fit ‘O’ rings here White Violet Orange Black Pink Violet Turquoise Several variations of cable colours are used as shown. Screen Screen 2 2 8 8...
  • Page 29 Figure 3 FD2-P , SD2-P , RD2, MD2-P , FD1-P , FD3-P Exploded View Washer detail Beryllium Washer Copper Washer Beryllium Washer Spring contact details - CE models Spring contact fitted centrally at rear of base Fit ‘O’ rings here Fit washers here Several variations of cable...

  • Page 30: Probe Head Replacement Procedure

    7. Probe Head Replacement Procedure Equipment Required • Case splitter part number 6AE025 (not required for D920-P , D930-P , FD1-P & FD3-P). • 20MHz Oscilloscope (Gould OS300 or equivalent) and x10 probe. • Plastic jawed vice. • DVM on current range (for specification see Appendix D). •...

  • Page 31: Dismantling Procedure - All Probes Except D920-P , D930-P , Fd1-P & Fd3-P

    Dismantling Procedure - (All probes except D920-P , D930-P , FD1-P , & FD3-P) 1. Align the case splitter jaws as shown below. Jaws engaged in probe case grooves Splitting the Probe Case 2. Gently squeeze the splitter handles together to release the case internal clips. 3.

  • Page 32: Dismantling Procedure - D920-P , D930-P , Fd1-P & Fd3-P

    Detach the case moulding from the end cap and slide case moulding over the probe. Discard the case moulding. De-solder the wire from the copper screen tube. Remove the tube. Refer to section 7.5 of the head fitting and alignment section of this service manual. 7.4b Dismantling Procedure - D920-P , D930-P , FD1-P &...

  • Page 33: New Head Fitting And Alignment

    New Head Fitting and Alignment. 1. Select a new head of correct frequency, identified as shown below. The probe heads are colour coded on the rear of the head as follows: FREQUENCY HEAD SHAPE FREQUENCY HEAD SHAPE 2MHz 8MHz 3MHz 10MHz 4MHz 5MHz...
  • Page 34 Power Supply Wiring Output -V V e Part No. Description White Black/Screen 6AH072 Head Alignment Service Kit Orange Violet Pink/Screen 4. Switch on power supply. 5. Connect scope probe to the Transmitter Terminals (Tx) of the head adaptor PCB and observe Sine wave.
  • Page 35 H H e e a a d d A A d d a a p p t t o o r r P P C C B B P P C C B B R R e e f f . . 6 6 A A H H 1 1 8 8 5 5 6 6 A A H H 1 1 8 8 5 5 -B B Head Adaptor PCB Ref : 6AH185...

  • Page 36: Reassembly Procedure - All Probes Except D920-P , D930-P , Fd1-P & Fd3-P

    Vascular Obstetric Probe Probe Figure 3 : Probe Layout 8b.Obstetric Probe Head Assemblies Only [e.g. OP2HS, OP3HS] Whilst observing the probe supply current, adjust PR1 so that supply current = 35 +0.2 If 35mA cannot be obtained, set PR1 to maximum current. 9.

  • Page 37: Reassembly Procedure - D920-P , D930-P & Fd1-P

    7.7a Reassembly Procedure - D920-P , D930-P & FD1-P Pl l e e a a se e no o te e : Re e mo o ve e th h e e pro o b b e e h h e e a a d d fro o m th h e e PCB i i f fi i tte e d d . Slide the copper screen over the probe and position so that the internal fold is located against the edge of the PCB.
  • Page 38 Remove any excess grease from the probe with a dry tissue. Check that the holes are aligned. First clean clip recesses at both ends using a dry tissue, then a cotton bud dipped in Propanol. Allow to fully dry. No o te e : Re e pl l a a c c e e me e nt c c l l i i ps must b b e e c c l l e e a a ne e d d pri i o o r to o a a sse e mb b l l y usi i ng Pro o pa a no o l l , to o re e mo o ve e a a ny e e xc c e e ss gre e a a se e .

  • Page 39: Reassembly Procedure - D920-P , D930-P , Fd1-P & Fd3-P

    7.7b Reassembly Procedure - D920-P , D930-P , FD1-P & FD3-P Pl l e e a a se e no o te e : Re e mo o ve e th h e e pro o b b e e h h e e a a d d fro o m th h e e PCB i i f fi i tte e d d . Slide the copper screen over the probe and position so that the internal fold is located against the edge of the PCB.
  • Page 40 Snap the clips into place. Use a clean tissue to remove any excess silicon. Repeat this process at the tail end, ensuring the wells are filled with silicon before inserting the clips. After the clips are snapped into place, use a clean tissue to remove any excess silicon.

  • Page 41: Waterproof Inspection & Test Procedure - D920-P , D930-P , Fd1-P & Fd3-P

    Waterproof Inspection & Test Procedure - D920-P , D930-P , FD1-P & FD3-P IMPORTANT: Th h i i s te e st i i s o o nl l y to o b b e e c c a a rri i e e d d o o ut wi i th h D92 2 0-P P , D93 3 0-P P , FD1-P P a a nd d FD3 3 -P P W W a a te e rpro o o o f pro o b b e e s.

  • Page 42: Probe Functional Test Specification

    8. Probe Functional Test Specification IMPORTANT: Th h i i s te e st must a a l l wa a ys b b e e pe e rfo o rme e d d a a fte e r a a ny se e rvi i c c e e wo o rk k h h a a s b b e e e e n und d e e rta a k k e e n o o n a a ny pro o b b e e .
  • Page 43 Probe Testing Sites OP2HS, OP3HS, D920-P P , D930-P P , FD1-P P and FD3-P P tests on forearm. VP4HS, VP5HS, VP8HS, VP10HS and EZ8 tests on arm (brachial artery). Functional Test - Obstetric Probes OP2HS, OP3HS, D920-P , D930-P , FD1-P , FD3-P D92 2 0-P P , D93 3 0-P P , FD1-P P , Switch the unit on.

  • Page 44: Fault Finding

    4. If any of these effects are heard, reject the probe for head replacement. PPG not locking on 1. Check retractile cable with either known good PPG probe or vascular probe. If fault still persists, consult Huntleigh Healthcare Ltd Service Department. 4 4 4 4...

  • Page 45: Spare Parts List

    10. Spare Parts List The following spare parts can be ordered from your dealer, or direct from Huntleigh Healthcare Ltd using the part numbers shown below: 10.1 D900-P Parts List 1 1 a a , , b b 2 2 0 0...
  • Page 46 Case Screw 6AE104 Battery Cover SP-6AH104 Retractile Cable B3W-4050 On/Off Switch 6AE171 On/Off Button Spring SP-726335/P-A On/Off Button 6AE108 Battery Terminal A0200 Loudspeaker SP-726308 Label Set 6AE232 Cork Gasket SP-726069 D900-P PCB SP-734053 D900-P PCB (LED Model) 4 4 6 6...

  • Page 47: D920-P , D930-P Parts List

    10.2 D920-P , D930-P Parts List 1 1 a a , , b b 1 1 8 8 1 1 6 6 1 1 7 7 1 1 5 5 1 1 4 4 1 1 9 9 a a , , b b 1 1 3 3 1 1 2 2 1 1 1 1 a a , , b b...
  • Page 48 Part Number Description 6AH102 Window Label 734303 Window Label (LED Model) SP-6AE102 Case Front HSJ7061-01-410 Headphone Socket CS194 LCD Display 091BH-LOG Volume Control 6AE103/1 Case Rear 6AE109 Foam Speaker Pad 200-901 ‘O’ Rings WN-1442-KB-25-20 Case Screw 6AE104 Battery Cover SP-726222 Fixed Waterproof Probe and Cable 2MHz SP-726224 Fixed Waterproof Probe and Cable 3MHz...

  • Page 49: Md2-P , Sd2-P , Fd2-P , Fd1-P , Fd3-P , Rd2 Parts List

    10.3 MD-2, SD2-P , FD2-P , FD1-P , FD3-P , RD2 Parts List 2 2 1 1 2 2 2 2 a a -e e 1 1 9 9 2 2 0 0 1 1 8 8 1 1 7 7 a a , , b b 1 1 6 6 1 1 5 5 1 1 4 4 a a , , b b , , c c...
  • Page 50 MD2-P LCD Display 092BH-LOG MD2-P Volume Control B3F-3150 Function/Mode Switch SP-6AE103/2/SE + 66EU102226 MD2-P Case Rear 6AE109 Foam Speaker Pad 200-901 ‘O’ Rings SJ0001-HUNTLEIGH Beryllium Washer WST1-FLAT Copper Washer WN-1442-KB-25-20 Case Screw 6AE104 Battery Cover SP-6AH104 Retractile Cable SP-726222 Fixed Waterproof Probe and Cable 2MHz...

  • Page 51: Obstetric And Vascular Probe Parts List

    10.4 Obstetric and Vascular Probe Parts List 2 2 a a , , b b , , c c , , d d 3 3 a a , , b b , , c c , , d d , , e e 4 4 a a , , b b , , c c 5 5 a a , , b b , , c c Part Number...

  • Page 52: Fixed Waterproof Probes

    10.5 Fixed Waterproof Probes D920-P , D930-P and FD1-P units have been fitted with two variants of fixed waterproof probe since 2008. The probes differ in the method of assembly and the parts used in their construction. There is no difference in performance as both types of probe use the same PCB. The waterproof probe first fitted to the D920-P , D930-P and FD1-P is the HSB series of probes.

  • Page 53: D920-P , D930-P , Fd1-P Hsb Series Probe Parts List

    10.5a D920-P , D930-P , FD1-P HSB Series Probe Parts List 5 5 a a , , b b , , c c , , d d 1 1 a a , , b b , , c c , , d d Complete Unit (Probe and Cable) Part Number Description...

  • Page 54: D920-P , D930-P , Fd1-P , Fd3-P Probe Parts List

    10.5b D920-P , D930-P , FD1-P , FD3-P Probe Parts List 5 5 a a , , b b 1 1 a a , , b b Complete Unit (Probe and Cable) Part Number Description SP-726222 FD1-P/D920-P Spare Probe SP-726224 FD3-P/D930-P Spare Probe 722065 Screen Assembly...

  • Page 55: Isp3 Probe Parts List

    10.6 ISP3 Probe Parts List 4 4 a a , , b b , , c c Part Number Description 722061 PA8 Head Assembly 722065 Copper Screen Assembly 6AE114 Probe Case Half x 2 76316-A End Cap Assembly M3 x 4 - Grub M3 x 4 Grub Screw 718-09-33890004 Probe Connector Socket...

  • Page 56: Ordering Information

    11. Ordering Information To order spare parts and for price information, contact the Service Department at Huntleigh Healthcare Ltd. Before phoning, be sure to have the following information available to ensure that our service department personnel are able to correctly identify your requirements: •...

  • Page 57: Special Handling Procedures

    Soldering Iron: 'Mini' type iron, temperature controlled to 375°C with fine tip (typically 0.8mm(1/32")) earth bonded. e.g.Weller EC3100D-ESP . Solder: SN62 type solder with multi cored flux type RA conforming to QQ-S-571e (US federal specification). e.g.Multicore 'smart wire'. If further information is required, please contact Huntleigh Healthcare Ltd 5 5 7 7...

  • Page 58: Device History Record Sheet

    Appendix B Device History Record Sheet SERIAL DRIVE SUPPLY DATE TX HEAD MAINTAINED DATE PRODUCT NUMBER VOLTAGE CURRENT CODE IMPEDANCE 5 5 8 8...

  • Page 59: Recommended Recorder Specifications

    Appendix C Recommended Recorder Specifications Vertical axis resolution: 6 dots/mm typical (if digital). Chart Speed: 10-25mm/sec typical. Minimum number of channels: Full scale span: 50mm or greater. Input ranges: 20mV/mm and 50mV/mm. Input impedance: >50k Bandwidth: DC to 25Hz minimum. 5 5 9 9...

  • Page 60: Test Equipment Specifications

    Appendix D Test Equipment Specification Synthesised Signal Generator Frequency Range 1-20MHz Frequency Resolution 10Hz or better Residual FM (0.03 to 20KHz) <8Hz SSB Phase Noise -136dBc typical Output Level Range -100 to +13dBm Output Level Resolution 0.1dB or better Output Impedence Frequency Counter Frequency Range 5Hz - 20MHz...

  • Page 61: D920-P, D930-P, Fd1-P, Fd3-P Probe Cable Wiring Details

    Appendix E D920-P, D930-P, FD1-P, FD3-P Probe Cable Wiring Details Screen White Black Yellow Screen Violet Pink Orange Turquoise Screen White Black Violet Several variations of cable colours are used as shown. 6 6 1 1...

  • Page 62: Waveform Output Connector Details Rd2 / Md2-P

    Appendix F Waveform Output Connector Details - RD2 / MD2-P Connection RS232 - TX RS232 - RX GROUND WAVEFORM RS232 - BUSY WAVEFORM RS232 - ENABLE 6 6 2 2...

  • Page 63: Trace Examples

    Appendix G Trace Examples 10mm/sec 50mV/mm 4 MHz 10mm/sec 50mV/mm 5 MHz 10mm/sec 50mV/mm 8 MHz 10mm/sec 50mV/mm 10 MHz 6 6 3 3...
  • Page 64 310-312 Dallow Road, Luton, Beds, LU1 1TD © Huntleigh Healthcare Limited 2004-2009 MEMBER OF THE GETINGE GROUP ® and ™ are trademarks of Huntleigh Technology Limited As our policy is one of continuous improvement, we reserve the right to modify designs without prior notice.

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