Proposal for the supply of pocket Doppler`s to Oxford Sonicaid
Contents
1. 8 4 9 5 7 D 2 l T 19905 I HIVI3d SuEN 546 924 unos 6002 ITEAN 19120 1001 1 SIMON 5548 021 HORNS saibajouyaa eun 920 Kouenbo 1ndino Buipiooas ade andino erea T em m oa Laos 24 maa TE T ceo f Seo g 3989 vH 23 8T f 87 88 Jra OM ZAS n A Pa ini 23s ba me 89 8 88 ES 615 ga SN d do 2 E 2 4 8 9 yoz 1 T os L 8 ee om GbE o8 NS MS99A gS Sh 5 WE 9 Jexeedspno1 2 81559 4 gla MESS LO wr ER yo jespeou ZH r9 L amo2. Ultrasound Technologies Ltd Lodge Way Portskewett Caldicot South Wales NP26 5 5 United Kingdom 44 0 1291 425425 44 0 1291 427093 ultratec doppler co uk W www doppler co uk Ultrasound Technologies Ltd 2MHz Transducer Assembly eee ee See PENS N 4 NI N lt lt Ng GR a gt grommet slots into provided on the probe M3 full nut Faceplate assembly ki gromet O A Ultrasound Technologies Ltd Lodge Way Portskewett Caldicot South Wales NP26 5PS United Kingdom T 44 0 1291 425425 F 44 0 1291 427093 E ultratec doppler co uk W www doppler co uk jo 19945 OIGNVGyd AN 789 6661 Wd 77 89 0 00 81 6 Mojsdeu uoni umeig 519459104 pi pue Lad a LO 861554 Jexyeedspno1
3. Ultrasound Technologies Ltd Lodge Way Portskewett Caldicot South Wales NP26 5 5 United Kingdom 44 0 1291425425 F 44 0 1291427093 E ultratec doppler co uk W www doppler co uk Ultrasound Technologies Ltd PD1 General Assembly Membrane Keypad Preparation Fibre washers x2 _ Audio PCB assembly Cable assembly Remove back aa 4 membrane in i Case rear kad 1 Dc x 12mm Pozi pan CJ screw x3 i Speoker wires connection detail in 1 Red 3 pin 2 Black Speaker wires Note link pins 2 amp 3 7 a E Offer cable assembly into E ble grommet sits in cose must exit left Ultrasound Technologies Ltd Lodge Way Portskewett Caldicot South Wales NP26 5 5 United Kingdom 44 0 1291 425425 44 0 1291 427093 ultratec doppler co uk W www doppler co uk Ultrasound Technologies Ltd 1 GA SSS Membrane Keypad Preparation
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10. Ultrasound Technologies Ltd Page 13 of 32 PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd Using a pair of tweezers Introduce noise into pin 4 of J 4 Rotate the volume control through its complete range of travel and observe the audio output from the speaker increases and decreases accordingly 4 5 Transducer Transmitter Set the DC Power Supply to 9Vdc solder the ve lead to pin 1 of J 1 and the ve lead to 1 2 on the board under test Switch ON the power supply check the current being drawn by the board under test is less than 50ma Using DVM measure the DC voltage at the junction of C8 and R7 this will be between 5 2 and 5 8V DC Using the oscilloscope connected to the pad TxSig adjust L1 so that the signal is set to 2 000MHz Adjust L2 to set the output to 1 5V pk pk Receiver Connect the oscilloscope to the junction of D2 and R12 adjust both L4 and L3 to maximise the DC signal Move the oscilloscope to J 1 pin 4 carefully stroke the transducer faceplate and observe a low frequency signal is displayed on the oscilloscope The measured output will be a DC voltage of greater than 5 5V 4 6 Velocity P rocessor With the oscilloscope set to AC input adjust the output signal from audio generator to a frequency of 1kHz and an amplitude of 15mV 1mV pk pk Connect this signal to the junction of C22 and U5 pin 1 Set frequency to 10KHz and attach oscilloscope to pin 7 IC3 adjust VR3 until the sign
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12. HEADSET Audio output for connection to a stereo headset for private listening RS 232 Interface Serial data output for connection to the optional ULTRATRACE 2 PC software Connections are made via the 3 5mm Stereo jack socket FHR DISPLAY Custom LCD module displays FHR rate FH pulse and Battery condition FH Fetal Pul z PD1 Babypulse leas tpu PD1dwr fetal E yansducer Fetatrack 120 fetal XM transducer C lur ntrol mu N FF a ntrol Pod 22 1 P lt Identificatior Label Ultrasound Technologies Ltd Page 6 of 32 PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd 23 Audio Unit PD1v The following functions are found in the relevant page of the operating instructions UNIT ON OFF Off control BATTERY LOW LED indicator to show when the battery has reached a point when it requires changing VOLUME CONTROL Rotary edge potentiometer which increases or decreases the setting of the volume HEADSET Audio output for connection to a stereo headset for private listening Ultrasound Technologies Ltd 7 of 32 PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd 24 Dismantling Instructions Special Note The instrument must not be dismantled when in use on a patient ensure all accessories are disconnected 2 5 Audio Unit The Audio unit
13. Engineering Drawings The following section contains circuit diagrams and Engineering Drawings Ultrasound Technologies Ltd Page 23 of 32 PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd e PD1 Audio PCB Layout y t i d N ka Ping maw Tm E R12 IL 2 le t mom m un af ll ib N x JU 77 gt 2 Ultrasound Technologies Ltd Page 24 of 32 PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd PD1 Audio PCB Layout m 2 l o lo ssl K E US HH a osi jp wi C28 MG EH E J6 ELD Ea _ W in m 18 2 o m Q pa 2 m m B O RIO Ultrasound Technologies Ltd Page 25 of 32 PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd PD1 Probe PCB Layout
14. 1206 luF Z5U Ceramic 1206 series Z5U dielectric C2 1 IC Analogue CD4013D Philips Harris National Ul 1 IC Analogue ZM33064Z Zetex U3 1 IC Analogue LM386M 1 National U2 1 Diodes 10BQ040 IR D1 1 Diode LED Yellow Temic TLLY 4401 D2 1 Transistor RFD8P055M Harris Q2 1 Transistor BS5138 Fairchild Semiconductor 01 1 Resistors 1 1206 10R Samsung Phillips ROHM R8 9 2 Resistors 1 1206 1K Samsung Phillips ROHM 2 1 Resistors 1 1206 2K2 Samsung Philips ROHM R10 1 Resistors 1 1206 4K7 Samsung Phillips ROHM R11 12 2 Resistors 1 1206 100K Samsung Philips ROHM R4 1 Resistors 1 1206 1M Samsung Phillips ROHM 3 5 6 7 4 Resistors 1 1206 3M3 Samsung Phillips ROHM 1 1 Volume Control 10K Log Tsubaya 161 2 10 VR1 1 Volume Control Knob Tsubuya 1KF 4B Black knob 1 Knob Connector J ack socket Hosiden 5 1501 010010 P1 2 2 Connector PP3 battery connector 1 Connector Molex 3 way ZIF Molex 39 51 3032 12 1 PD1D103 PD1 Audio PCB 1 Ultrasound Technologies Ltd PD1 service manual Issue 2 January 2005 Page 18 of 32 Ultrasound Technologies Ltd 6 3 PD1 2MHz Transducer Assembly Description Value Device Type CircuitReference Quantity Capacitor 100uF Min Electrolytic 16V Nippon Chemi con SRA 5 8 12 3 5mm Samsung SSM Capacitor 1u0F tant 35V case size A 4 11 2 Capac
15. Instrument 2 1 Audio Unit 2 2 Audio Unit 2 3 Audio Unit 2 4 Dismantling Instructions 2 5 Audio Unit 2 6 Transducers Circuit Description 3 1 Introduction 3 2 Audio Unit Power Supply 3 3 Battery Low Indicator 3 4 Ultrasound Transducer 3 5 Oscillator and Detector 3 6 Receiver and Detector 3 7 Audio Amplifier 3 8 Velocity Processor Test and Calibration 4 1 Introduction 4 2 Performance Checks 4 3 Test Procedure 4 4 Audio Unit 4 5 Transducer 4 6 Velocity Processor 4 7 Transducer Calibration Fault Finding 5 1 Fault Finding Guidelines Parts Lists 6 1 Audio Unit PCB Assembly 6 2 Audio Unit with heart rate PCB Assembly 6 3 2MHz Transducer assembly 6 4 General Assembly 6 5 units General Assembly Drawings and Circuit Diagrams PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd Lodge Way Portskewett Caldicot South Wales NP26 5 5 United Kingdom 44 0 1291 425425 44 0 1291 427093 ultratec doppler co uk W www doppler co uk Ultrasound Technologies Ltd 1 General Introduction ll Introduction This service manual is written to support the maintenance and repair of the PD1 Series Doppler detectors Servicing of this equipment should be performed by a qualified technician after carefully studying this manual The drawings and circuit descriptions in this manual are correct as of the date it was prepared however however the Comp
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17. 1 Symbol 878 02 02 Type B Equipment IEC Symbol 348 Attention Consult accompanying documents Serial DATA ky a Headset Output M Volume Control Rear View of doppler Showing additional symbols Ultrasound Technologies Ltd 2 of 32 PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd 13 CE Mark This product complies with the essential requirements of the European Council Directive 93 42 EEC relating to Medical Devices 0120 14 Guidelines for identifying and resolving adverse EMC conditions This productis classified as a Class A Group 1 type of product according to EN55011 Emissions Care has been taken through the design and manufacturing process to minimise the EM emissions which may be produced by this equipment However in the unlikely event that the unit causes an EM disturbance to adjacent equipment we suggest that the procedure is carried out out of range of the affected equipment Immunity If the user has any doubt regarding the units EM immunity during routine operation we suggest that the source of EM disturbance is identified and it s emissions reduced If there is any doubt regarding the identification and resolution of adverse EM conditions contact Ultrasound Technologies Ltd directly who will advise on the situation The address can be found in the front of this manual Ultrasound Technologies Ltd 3 of 32 PD1 service man
18. 1dwr fetatrack 120 R S232 interface to optional UltraTrace software PD1v not PD1v CAT vascutrack 120 Voltage output proportional to velocity of flow ABS 150mm by 75mm 295g typically including transducer Class 1 Type B IEC 60601 1 Page 4 of 32 PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd 2 Description of the Instrument 21 Audio Unit PD1 Fetatrack 120 Babypulse The following functions are found in the relevant page of the operating instructions UNIT ON OFF Off control BATTERY LOW LED indicator to show when the battery has reached a point when it requires changing VOLUME CONTROL Rotary edge potentiometer which increases or decreases the setting of the volume HEADSET Audio output for connection to a stereo headset for private listening Headset Battery Low LED Output Volume Control PD1 Babypulse Fetatrack 120 fetal transducer fetal transducer ON OFF Control Identification Label Ultrasound Technologies Ltd Page 5 of 32 PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd 22 Audio Unit PD1 PD1dwr fetatrack 120 babypulse The following functions are found in the relevant page of the operating instructions UNIT ON OFF Off control VOLUME CONTROL Rotary edge potentiometer which increases or decreases the setting of the volume
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20. Probe Cover PD1D101 2 M3 x16 Pozi C sk screw 1 M3 Full nut 1 Cover plug 2 Ultrasound Technologies Ltd PD1 service manual Issue 2 January 2005 Page 20 of 32 6 4 PD1 Audio Unit General Assembly Description Part Number Quantity Case Front PD1D105 1 Case Rear PD1D106 1 Battery Slide PD1D104 1 Loudspeaker 1 Retractile cable PD1D100 1 Label front PD1D108 1 Label rear PD1D108 1 Front Membrane PD1D108 1 M3 x 6 screw 2 M3 Internal shakeproof washer 2 M4 x 12 Pozi Pan screw 3 Fibre flat washer 2 Cable tie 1 PVC Foam based adhesive strip 0 1 Serial number label 1 Ultrasound Technologies Ltd PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd Page 21 of 32 Ultrasound Technologies Ltd 6 5 PD1 General Assembly Description Part Number Quantity Case Front PD1D105 1 Case Rear PD1D106 1 Battery Slide PD1D104 1 Loudspeaker 1 Retractile cable PD1D100 1 Label front PD1 PD1D108 1 Label rear PD1D108 1 Front Membrane PD1 PD1D108 1 x 6 Pozi screw 2 M3 Internal shakeproof washer 2 M4 x 12 Pozi Pan screw 3 Fibre flat washer 2 Cable tie 1 PVC Foam based adhesive strip 0 1 Serial number label 1 Ultrasound Technologies Ltd Page 22 of 32 PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd 7 0 Circuit Diagrams amp
21. Re Re 0805 R 0805 e Re 0805 Re 0805 ors 196 0805 sistors 1 sistors 1 sistors 1 sistors 1 sistors 1 sistors 1 sistors 1 sistors 1 sistors 1 Resis LCD module CC Ultrasound Technologies Ltd PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd Harris Harris Samsung P hillips R OHM Samsung P hillips R OH Samsung P hillips R OHM Samsung P hillips R OHM R9 13 15 16 18 19 20 21 22 23 24 25 26 2 8 29 Samsung P hillips RO HM Samsung P hillips ROHM Samsung Phillips R OHM R30 Samsung Phillips R OHM SamsungjP hillips R OHM SamsungjP hillips R OHM Samsung P hillips RO HM Tsubuya 161P N2 A10K VR1 knob Tsubuya 1KF 4B Black Knob Hosiden HSJ 1501 010010 Molex 39 51 4032 PD1D109 Page 17 of 32 Ultrasound Technologies Ltd 6 2 PD1 Audio PCB Assembly Device Value Device Type Circuit Reference Quantity Capacitor 470uF Electrolytic Axial 10V Panasonic SU C7 1 ECEB1AU471 Capacitor 100uF Min Electrolytic 16V Nippon Chemi con SRA C1 8 9 11 12 5 5mm Samsung SSM Capacitor 10uF tant 20V AVX KemetcasesizeA C13 14 2 Capacitor Ou47F tant 25V AVX Kemetcase size A C4 5 2 Capacitor 1206 100nF Mono Ceramic 1206 series Z5U dielectric C6 8 9 10 15 5 Capacitor 1206 10nF Mono Ceramic 1206 series X7R dielectric 1 Capacitor
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23. Ultrasound Technologies Ltd PD1 amp Fetatrack 120 series Dopplers Service manual PD1 FT120 service manual Issue 3 Jan 2007 Ultrasound Technologies Ltd Lodge Way Portskewett Caldicot South Wales NP26 5 5 United Kingdom 44 0 1291425425 F 44 0 1291427093 E ultratec doppler co uk W www doppler co uk Ultrasound Technologies Ltd Products covered by this service manual Product Group p 4 PDI Product version T Product variation M Babypulse home use doppler k PD1 audio pocket doppler Fetatrack 120 audio doppler gt b mM co PD1dwr waterbirth x lt 1 fetal doppler with FHR display 5 Fetatrack 120 fetal KIS H N 2 doppler with FHR P PD1v flat probe vascular doppler PD1v vascular doppler NG PD1cv low cost vascular doppler Vascutrack 120 vascular doppler PDicombi fetal vascular doppler PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd Lodge Way Portskewett Caldicot South Wales NP26 5PS United Kingdom 44 0 1291425425 F 44 0 1291427093 E ultratec doppler co uk W www doppler co uk Ultrasound Technologies Ltd CONTENTS General Introduction Introduction Re Order Information Symbols CE Marking Guidelines for identifying and resolving adverse EMC conditions Specification Buan Description of the
24. al just changes state from OV to 5V The signal will be rough DC Using a multimeter place the ve probe to the junction of R18 R19 and C19 adjust VR4 until the until the DC level measures 5V Ultrasound Technologies Ltd Page 14 of 32 PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd 5 0 Fault finding guidelines This section is an aid to trouble shooting and should be used in conjunction with the relevant circuit diagrams found atthe rear of this manual In each case the re calibration must be carried out after any repair The following tables list some of the symptoms and the relevant circuit areas NOTE Do not under any circumstances attempt to repair the instrument whilst it is connected to a patient Symptom Suspect Circuit Check Unit does not switch ON Remote switch on front panel J1 pin 1 goes low when switch is depressed U1 ON OFF Control Output goes low when switch is depressed Battery Jl pinl gt 7V Battery Low LED on Battery condition Jl pinl gt 7V permanently Replace battery U3 Comparator See test calibration section Excessive battery drain U1 Q2 ON OFF Control Q2 must switch when switch is depressed Change battery Ultrasound OK but no audio Transducer position Re position transducer Crackling operation of volume Replace volume control control VR1 Broken conductor in cable Check audio signal on pin 3 of U2 Headphone socket SK2 Audio si
25. any reserves the right to make changes to improve the operation of the instrument If your instrument does not exactly match the information in this manual contact the manufacturer or distributor for revision information Inspect the instrument upon receipt in the unlikely event that the unithas been damaged notify your distributor or Ultrasound Technologies directly at the following address Ultrasound Technologies Ltd Lodge Way Portskewett Caldicot NP26 5PS South Wales UK Telephone 44 0 1291 425425 FAX 44 0 1291 427093 E mail serviceQ doppler co uk Retain the packing material for possible future use Important Note In the unlikely event that the instrument must be returned to Ultrasound Technologies for service or for any other reason use the same packing material in which the instrument was delivered If this is not available the instrument should be packed in such a way that will provide adequate packing The Company will not accept any responsibility for loss or damage due to improper use of packing material Ultrasound Technologies Ltd Page 1 of 32 PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd 11 Re Order Information Listed below the consumables used with the PD1 Series Pocket Dopplers Description Ultrasound Coupling Gel 0 25ltr MN1604 series Alkaline Battery 12 Symbols The following symbols have been used on the PD1 and are here defined according to IEC6060
26. circuit is fed directly from the battery D1 provides circuit protection from battery reversal The unit is turned on by the membrane switch which is mounted on the front of the unit Closing the switch grounds the CLK input of U1 pin 3 the output on pin 2 switches on Q2 allowing current to flow into the various circuits The unit will remain switched on for approximately 5 minutes set by C4 and R5 after which it turns off automatically unless the user forces the unit off by de pressing the ON OFF switch 3 3 Battery Low Indicator U3 is a voltage detector when the voltage on pin 1 drops below the threshold set by R10 and R11 7 3V the output state changes forcing the LED D2 to illuminate 34 Ultrasound Transducer The ultrasound transducer operates on the pulse wave Doppler principle There are a number of transducer frequencies suitable for different applications however the basic operating principles are identical Each transducer consists of a pair of piezo ceramic crystals each crystal pair is arranged as a transmitter and receiver the ultrasonic output beam is focussed through a lens or faceplate Ultrasound Technologies Ltd Page 11 of 32 PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd With the exception of the 2MHz Fetal transducer the electronics are housed in the main audio unit The oscillator and detector are built up of four discrete sections These are the master oscillator transmitter ampli
27. fier receiver amplifier and detector These operate to produce a pulse wave ultrasound signal that is passed to the transmitting crystal in the transducer The signal is then reflected from moving interfaces within the body to the receiver crystal in the transducer amplified and then detected so the audio Doppler shift of that moving interface can be heard audibly and or converted into a velocity signal 3 5 Oscillator and Transmitter Amplifier Field effect transistor Q2 with L1 C16 C17 and associated components form a Colpitts oscillator This oscillator runs at a nominal frequency of 2 5 or 8MHz producing a pulse wave of amplitude of approximately 5V Pk The signal is then fed to output transistor Q3 that drives the transmitter crystal in the transducer The output power is set by VR1 The signal is fed to the transducer via a tuned transformer L2 C23 the output impedance of which is set correctly to match the transducer crystal impedance The output drive signal is nominally 1 5V Pk 3 6 Receiver and Detector The reflected Doppler signal is fed via a resonant transformer L4 C25 to the gate of Q5 the drain of this FET connects to the source of Q4 to form a cascode amplifier the drain of which contains the resonant circuit L3 C21 From the drain of Q4 the amplitude complex of the received signal is detected by passing the signal through diode D2 with the high frequency signals being filtered by R12 and C15 The raw low frequency com
28. gnal on J 3 pin 1 Replace loudspeaker Unit unstable Ultrasound transducer Check output drive into crystal is 1 5V pk pk Check received signal in transducer J 1 pin 4 signal should be a low frequency audio signal approx 2Vpk pk Replace transducer O Ultrasound Technologies Ltd Page 15 of 32 PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd 6 0 Parts list The following section contains parts lists for the follow e PD1t Audio PCB assembly e PD1 Audio PCB assembly PD12MHz Probe assembly e PDI Final assembly e 1 assembly 6 PD1 Audio PCB Assembly 1 470uF Electrolytic Axial 10V Capacitor 100uF Min Electrolytic 16V 5mm itor tor 0 Panasonic SU 0 0 0 ECEB1AU471 Samsung SSM 0805 series Z5U die 0805 series X7R die 0805 series X7R die Capac Zetex National National Maxim Zetex Maxim Maxim Temec Ultrasound Technologies Ltd PD1 service manual Issue 2 January 2005 Device Type Nippon Chemi con SRA 10uF tant 20V case size AVX Kemet case si 0u47F tant 25V case size A AVX Kemet case si 0805 series COG dielectric 0805 series COG dielectric 1206 series Z5U dielectric Philips Harris National P hilips Harris National ing items 2 9 11 12 13 18 19 21 27 28 29 30 32 33 34 35 37 3 1 5 1 2 2 2 3 7 2 GN _ Page 16 of 32 IC Digital ICM7211AMIM44 R R 0805 0805 e e Re R
29. houses the main circuit board To remove the circuit board turn the unit onto it s front and remove the three M4 countersunk screws The rear panel will now come away revealing the PCB Remove the two M3 screws securing the PCB Ultrasound Technologies Ltd Page 8 of 32 PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd Mermbral tail folds through slot and lor itl ISU pE into zif nnector J2 Ensure that tt incl tail locat rrectly into socket Do not crease the tail tail exces iro pcb usi should be thi id f PCB Do ne M mm pozi pat trap b tweer both halves of the case during final assembl hakepro isher Battery lead nnection detail pir Red Retractil ibl nnection detail t pir Red t pil ead pil reer id secure t pin 4 hit Note link pins 2 amp 3 underside The transducers loudspeaker and battery connections are hard wired to the PCB De solder the connections 4 retractile cable and 3 loudspeaker the PCB can then be pulled clear of the case Ultrasound Technologies Ltd Page 9 of 32 PD1 service manual Issue 2 January 2005 Ultrasound Technologies Ltd 2 6 Transducers The transducers are a sealed unit However it is possible to gain access to the 2 MHz asse
30. itor 100nF Mono Ceramic 0805 series Z5U dielectric 1 2 3 7 10 26 22 24 8 Capacitor 10nF Mono Ceramic 0805 series X7R dielectric 18 1 Capacitor 22nF Mono Ceramic 0805 series X7R dielectric C6 13 2 Capacitor 1n0F COG Ceramic 0805 series COG dielectric C9 15 23 3 Capacitor 220pF COG Ceramic 0805 series COG dielectric C19 20 25 3 Capacitor 330pF COG Ceramic 0805 series COG dielectric C17 1 Capacitor 470pF COG Ceramic 0805 series COG dielectric C21 1 Capacitor 680pF COG Ceramic 0805 series COG dielectric 16 1 IC Analogue TLO72CD 565 TI 01 1 Diodes BZX84C6V2 D1 1 Diodes BAT54 D2 1 Transistor MMBF 4416LT1 Motorola Q24 5 3 Transistor BC848B 013 2 Inductor Toco 0838 L4 1 Inductor Toco 0842 L3 1 Inductor Toco 0841 L1 1 Inductor Toco 0876 L2 1 Resistors 1 0805 10R Samsung Phillips ROHM R17 16 2 Resistors 1 0805 22R Samsung Phillips ROHM R7 1 Resistors 1 0805 100R SamsungjP hillips ROHM 1 Resistors 1 0805 1K SamsungjPhillips ROHM R3 8 2 Resistors 1 0805 1K5 Samsung Phillips ROHM 15 1 Resistors 1 0805 2K2 Samsung Phillips ROHM R1 2 11 3 Resistors 1 0805 27K Samsung Phillips ROHM 14 1 Resistors 196 0805 100K Samsung Phillips ROHM R4 5 6 9 10 12 18 19 8 PCB PD1D110 PD1 probe board 1 Piezo Ceramic Crystal 2MHz Resonant Frequency 2 Ultrasound Technologies Ltd PD1 service manual Issue 2 January 2005 Page 19 of 32 Ultrasound Technologies Ltd Faceplate PD1D102 1
31. mbly by removing the two blanking grommets and M3 countersink screws Removing the screws will allow the assembly to be split along its length Gently prise the assembly apart ASSEMBL IE OF 2MHz DOPPLER TRANSDUCER LL M3 x sl a Probe PCB assembly ng X BI E able grommet slo t ce i provided on the probe M3 full The circuit board is bonded and keyed to the faceplate assembly using a high strength cyno acrylic adhesive Circuit board removal is carried out by carefully breaking the bond and de soldering the crystal wires and retractile cable connections see diagram below Ultrasound Technologies Ltd PD1 service manual Issue 2 January 2005 Page 10 of 32 Ultrasound Technologies Ltd 3 0 Circuit Description 31 Introduction The circuit has been divided into functional blocks with each block being described separately the blocks are as follows 2 2 Audio Unit Power Supply Battery Low Indicator Ultrasound Transducer Oscillator and Detector Oscillator and Transmitter Amplifier Receiver and Detector Audio Amplifier Controls and Indicators Unit ON OFF Battery Low Audio Unit Power Supply The unit operates from a single 9 Volt dry battery It is recommended that only alkaline cells be used The audio
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33. plex is then amplified and filtered by U1 where its associated components form a band pass filter amplifier with a bandwidth of 150Hz to 1KHz for the obstetrics or 300Hz to 4 2 in the vascular transducer This signal is passed to the audio unit via the retractile cable 3 7 Audio Amplifier The audio signal is routed via the retractile cable to J 4 pin 4 on the audio circuit board The signal passes through the potentiometer VR 1 to the audio amplifier U2 where it is amplified and output to the loudspeaker connected to 3 3 8 Velocity Processor PD1V Model Only The audio signal is fed from the band pass amplifier U5 through the threshold control VR3 to the V to F converter U3 The conversion factor is 0 5V KHz with fine adjustment provided by VR2 The output of this circuit is then scaled by R4 6 to a suitable voltage level for most ECG machines and recorders Ultrasound Technologies Ltd Page 12 of 32 PD1 service manual Issue 2 January 2005 4 0 41 42 43 44 Ultrasound Technologies Ltd Test and Calibration Introduction The following sections detail tests to ensure that the unit is operating within specification These tests may be performed in whole or part however if any repairs are carried outto the power supply circuits then it is recommended thatthe whole test calibration procedure is undertaken Performance Checks The following procedure is intended to provide a means of determining the functional s
34. tatus of the unit It should be included as part of a preventative maintenance plan and should be performed on a regular basis atleast once a year Ensure that a full capacity alkaline cell is fitted Switch the unit ON and increase the volume to maximum The battery low indicator will flash ON momentarily and then extinguish Place the transducer with ultrasound gel on the palm of the hand over the radial artery a Clear pulse will be heard Check the unit for signs of damage particularly the transducer cable near the point of entry to the unit and transducer body Equipment Oscilloscope 2 channel 50 MHz bandwidth minimum resolution 5mV cm DC Power Supply 0 30VDC 1A Digital Multimeter 4 Digit measuring 1mV 0 1ohm Frequency Counter 0 10MHz resolution at 2MHz 1KHz Signal Generator 10Hz to 10M Hz 1mV to 10V Sinewave Audio Unit Set the power supply to 9VDC output and connect to battery fling leads Switch ON the power supply Switch the board under test ON by shorting pins 1 and 2 of connector 1 Check the battery low LED flashes momentarily Check the current being drawn by the board under test is less than 50ma Using the DVM measure the DC voltage at the Drain of Q2 junction of C8 amp C11 this will be between 8 80 and 8 60 V DC Carefully decrease the power supply output check and record the voltage reading at which point the Battery low LED illuminates permanently This will be between 7 0 and 7 5 V DC
35. ual Issue 2 January 2005 15 Series specifications Ultrasound Frequency Transducer Output power Audio response Audio output Fetal heart rate Fetal Heart Range Unit Controls Keys Controls Indicators Indicators Power Supply Battery Expected battery life Expected battery life Outputs Headset Serial Recorder Enclosure Material Size Weight Safety Classification Ultrasound Technologies Ltd Ultrasound Technologies Ltd 01 PD1dwr fetatrack 120 2 MHz continuous wave fixed probe PD1v PD1cv Vascutrack 120 5 or 8 MHz continuous wave fixed probe PD1 combi 1 combi Combitrack 2 3 5 or 8MHz interchangeable probe 2 crystal narrow beam 5mW cm SATA 2 3 MHz fetal probe 15mW cm SATA 5 and 8MHz vascular probe 300Hz 1KHz fetal 300Hz 4KHz vascular 500mW 1 1 combi PD1dwr fetatrack 120 Multipoint real time autocorrelator 50 to 210 bpm 1 Key for unit on off on audio unit all models 1 Key for unit on off on probe fetatrack 120 and vascutrack 120 models Rotary volume PD1 PD1 combi 1 fetatrack 120 vascutrack 120 Yellow battery low LED 01 1 combi PD1dwr fetatrack 120 3 digit FHR LCD display FHR pulse icon Battery Low icon MN1604 PP 3 9V Alkaline Manganese 1 PD1v fetatrack 120 vascutrack 120 59 hours 1 PD1dwr fetatrack 120 58 hours Audio output to optional headset 01 PD
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