726374-11 Doppler Service Manual Layout 1

1 Service AgreementsPeriodic inspection is essential to ensure continued effective operation. Contact the Companyor its approved agents or distributors for further information on Service people in mind and are trademarks of Huntleigh Technology LimitedAs our policy is one of continuous improvement, we reserve the right to modify designs without SENSITIVITYPOCKET DOPPLERS726374-11 Huntleigh Healthcare Limited 2004-20092 Table of Contents1. General Information ..4 ContentsPage .. / Inspection .. And Cleaning ..82. Safety Aspects .. Supply .. Display Elements .. Shut Off ..123. Specifications .. Is Static Electricity?

2 Measures ..255. Electrostatic Discharge (ESD) Precaution .. Doppler Principle .. Audio Processing .. Heart Rate Processing, (FD2, MD2, FD1, FD3) .. Signal Processing (MD2, SD2, RD2) .. Identification .. Noise Reduction .. Auto Shut Off (FD2, SD2, MD2, FD1, FD3, RD2) .. Pulses .. Conversion .. Output ..15 .. Mode FHR .. Mode FHR .. Dopplex (D920, D930), Mini Dopplex (D900) .. , SD2, MD2, FD1, FD3, RD2 .. Probe (OP2HS, OP3HS, D920, D930, FD1, FD3) .. Probe (VP4HS, VP5HS, VP8HS, VP10HS, EZ8) .. Probe ..234. Technical Description .. Policy .. Handling .. Unit Dismantling Procedure.

3 Removal .. Components .. Unit Reassembly ..286. Servicing Procedures - Control Unit .. Required .. - For High Sensitivity Probes ..(OP2HS,OP3HS,VP4HS,VP5HS,VP8HS,VP10HS, EZ8) .. Procedure - All Probes except D920, D930, FD1 & FD3 .. Procedure - D920, D930 & FD1 .. Procedure - D920, D930, FD1 & FD3 .. Head Fitting and Alignment .. Procedure - All Probes except D920, D930, FD1 & FD3 .. Procedure - D920, D930 & FD1 .. Procedure - D920, D930, FD1 & FD3 .. Inspection & Test Procedure - D920, D930, FD1 & FD3 ..437. Probe Head Replacement Procedure ..323 Table of Required .. Tests - Vascular Probes VP4HS - VP10HS.

4 Test - Obstetric Probes OP2HS, OP3HS, D920, D930, FD1 & FD3 ..458. Probe Functional Test Specification .. - Marks On Display .. Sound .. Dead .. Output From Sockets .. Heart Rate Tracking .. Sensitivity, Crackling .. not locking on ..469. Fault Finding .. Parts List .. , D930 Parts List .. , SD2, FD2, FD1, FD3, RD2 Parts List .. and Vascular Probe Parts List .. Waterproof Probes .. , D930, FD1 HSB Series Probe Parts List .. , D930, FD1, FD3 Probe Parts List .. Probe Parts List ..5710. Spare Parts list .. Returns ..5811. Ordering Information ..58 Special Handling Procedures.

5 59 Recommended Soldering Equipment for Rework ..59 Appendix A ..59 Device History Record Sheet ..60 Appendix B ..60 Recommended Recorder Specifications ..61 Appendix C ..61 Test Equipment Specifications ..62 Appendix D ..62D920, D930, FD1, FD3 Probe Cable Wiring Details ..63 Appendix E ..63 Waveform Output Connector Details RD2 / MD2 ..64 Appendix F ..64 Trace Examples ..65 Appendix G .. 65 Electromagnetic Compatibility ..66 Appendix H .. 664 General InformationThis Service Manual provides the technical information required for repair and maintenance ofthe Huntleigh Healthcare Mini Dopplex - D900 Audio Dopplex - D920 (with fixed waterproof 2 MHz probe), D930 (with fixed waterproof 3 MHz probe) Fetal Dopplex - FD1 (with fixed waterproof 2 MHz probe) Fetal Dopplex - FD3 (with fixed waterproof 3 MHz probe) Fetal Dopplex II - FD2 Super Dopplex II - SD2 Multi Dopplex II - MD2 Rheo hand held Dopplex range, including the range of OPHS (Obstetric High Sensitivity Probes)and VPHS (Vascular High Sensitivity Probes)

6 Interchangeable note that the Super Dopplex 1, Multi Dopplex 1 and (NTD) probes are not compatiblewith the D900, FD2, SD2, MD2, General IntroductionDue to the nature of static sensitive surface mount technology, specialised equipment andtraining is required when working on the surface mounted components used within this reason, circuit diagrams are not included in this Manual . Block diagrams and faultfinding sections are included to make fault finding to leaded component level within the warranty period must not be dismantled and should be returned to HuntleighHealthcare Ltd for repair. Any units returned showing signs of tampering or accidental damagewill not be covered under the warranty (refer to user Manual for further details).

7 Servicing PolicyRThe Dopplex range of products includes the D920, D930, D900, FD2 (Obstetric Doppler withheart rate display) SD2 (dedicated vascular Doppler ), MD2 (Bi-directional vascular Doppler ),D920, D930 (Mini Dopplex with waterproof probe), FD1, FD3 (Obstetric Doppler with heart ratedisplay and waterproof probe) and RD2 (vascular Dopplex with Photoplethysmographic sensor). DescriptionAlthough every care has been taken to ensure that the information in this Manual is accurate,continuous development may result in equipment changes. The Company reserves the right tomake such changes without prior notification, and resulting Manual inaccuracies may Manual and any changes are protected by InformationThe FD1 and D920 have dedicated 2 MHz probes that are hard wired via a retractile FD3 and D930 have a dedicated 3 MHz probe that is hard wired via a retractile Dopplex (D900 )is primarily a vascular unit with a non-directional waveform output.

8 The Mini Dopplex accepts the obstetric probes, providing audio only Dopplex II (FD2)has interchangeable probes accepting the full range of obstetric and vascular probes, although it is primarily a Fetal Dopplex with a heart rate display. Using the vascular probes, only audio signals are available and there is no rate counting facility, or waveform Dopplex II (SD2)is a dedicated vascular Doppler with all the vascular functions of the MD2, but without the RS232 waveform Dopplex II (MD2) is a multi-purpose Doppler with bi-directional waveform and stereo headphone outputs. Graphical representation of velocity waveformsis given by the LCD display.

9 The same obstetric features of the FD2 are incorporated into the Dopplex (D920are dedicated obstetric Dopplers with fixed waterproof 2 MHz D930) (D920) and 3 MHz (D930) Dopplex Plus (FD1)is derived from the FD2, but has a hardwired waterproof 2 MHz derived from the FD2, but has a hardwired waterproof 3 MHz Dopplex II (RD2) has the vascular functions of the MD2 with the addition of a Photoplethysmographic further details on the controls, please refer to the user to the nature of the components used within these products, special precautions must betaken to avoid damage to the CMOS and microcontroller based circuitry.

10 Static damage maynot be immediately evident but could cause premature series of units must only be dismantled and serviced within a specialised handling area(SHA) as defined by CECC00015 (published by CENELEC) to avoid damage to the Antistatic HandlingThe control unit comprises a single PCB on which all circuitry and electro-mechanicalcomponents are mounted directly except for the loudspeaker which is attached by flying hard wired cable provides the connection to the PCB has surface mounted components on both sides. All leaded and electro-mechanicalcomponents are on one electro-mechanical and through hole components on the control PCB are serviceable usingstandard tools and soldering techniques, provided that anti-static precautions are alwaysobserved.