PD1 & FT120 series pocket dopplers
Contents
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4. W U Uu T CJ Carefully feed the flexible through slot in case Do not bend or crease tail fit into ziff connector on Remove backing marterial and apply membrane into recess NN WE m EE us Cu _ Rig HH ne ee TIL o uu mor 16s ht Cite P 2 M TINTE gt Q aL doin 1 inu E IC e a DEDEDE id 26 D D di C o pr O Ultrasound Technologies Ltd Lodge Way Portskewett Caldicot South Wales NP26 5PS United Kingdom T 44 0 1291 425425 44 0 1291 427093 ultratec doppler co uk www doppler co uk Ultrasound Technologies Ltd 2MHz Tr
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6. 57 M C3 centers 9268 7 c SERERE C4 219 Tombs Jun 7 O C2 m c Ri7 gt _ He SD C C6 U1 O Ultrasound Technologies Ltd Page 25 of 32 PD1 FT120 service manual Issue 3 January 2007 Ultrasound Technologies Ltd PD1 Probe PCB Layout VE side gi 4 Gs RIZ Ee C10 C4 C2 R3 x RV oo 5 O 017 1185 aah 102 u Under side Ca por NIO E DS 04 Dile R6 10 99 c C9 RO c Oly C114 R8 13 gt RV1 Modifications Fit 100R resistor to position RV1 using pads shown Ultr
7. 1905 93oN Sys e qp uonisod 11 ejqpo 4940 SS you Jed G L oyog PUD ueeJos ADMD duis inj sod 5 uonisod y 9 N 6 ud jo duis x D 13 uid Zr ud uonpinsur n uonoeuuoo ejqpo Z uid i uonoeuuoo 7 i m uonisod dins x 09 jooudexpus uod 1209 x z qod eunoes jouy T 9500 uyoq dd jo epis eq pinoys 03 jou 2 s93D20 eu eunsuj 40JO UUOD
8. 402 99 ueeJos JJO ino 2 Aiquiessp 4 4 JO 59204 49400 JOONPSUDJ eui uyoq f quiessp 210149254 god oj 18 CW y AjnjeJ02 SJOAOD JOONPSUDIY epi oud Jo euoois ABMJOPIE 30 inu inj CW 49402 eqoud uo pepi oud 3015 91909 SWUM v pod pod If 42518 2 pod if pod f 49409 eqoud uo ssoq 514 ejpjdeop god god 1 N M949S 15 9 buo 91 X 19 355 YSONGSNVYL JO WNOILOSS 34 3 ONIMVHO 2 eee eee eee eee 3wos oa SVIDONV 02 62 1 88 WAJNIS oe NUN M 5000 ON SONSGISNOD NI 5 LNSWNDOC SIHL YJONASNYYL zHW8 ZHWG q3 H3s3M SIHOlM TV ON S3ISOIONHOSL QNnosvari 5 S3ONVH3101 SNOISN3MIQ TILIL 23
9. spjoj eubuquuew Jed 2 aa jo yybiey o uonoeuuoo Jexpeds O 0 uo 689204 Oju im M ped eq nw jo Bod upd 1204 x OUI 34 Jo pueq oj jou aya soul 49110409944 sse eu y Addy 9809 106 euy euy pees AjjnjeJD eupJquueu eu 91909 jDUe DW eui mojo D UO 6 58000 onsp d jo f lt Jjooudexpus gt 9198 1204 x god 4 oj uo eupnbs p eq uMous uonisod Jequunu Ajddy uMOUS SD 9 jueunapduuoo ys ejqpue uyoq 404 9502 NOISSINM3d SH3NMO
10. volume Control Identification abe Ultrasound Technologies Ltd PD1 FT120 service manual Issue 3 535 PD1 Babypulse PDidwr fetal transducer Fetatrack 120 fetal transducer 2 P NES EM 2 X Beso rie gt i oa ea i 4 5 uer Page 6 of 32 January 2007 Ultrasound Technologies Ltd 22 Audio Unit PD1v The following functions are found in the relevant page of the operating instructions UNIT ON OFF On 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 Page 7 of 32 PD1 FT120 service manual Issue 3 January 2007 Ultrasound Technologies Ltd 2 4 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 houses the main circuit board To remove the circuit board turn the unit onto it s front and remove the three 4 countersunk screws
11. SE UI PIN 9 UNIT SWITCHED ON UI PIN 9 UNIT SWITCHED OFF T F 1B 2ms 8 801 5 2 8 801 62 Umak 288 8 Ususc 2T 89mU 9 2814 1 3 064 2H Heme ABS 1 95 BBu UI PIN 10 UNIT SWITCHED ON CH1 f 1 f CELUM ABUL 221 92 15 Bi Au Umak 2 281U 2 5000 290 5 88 28 BBms 5 BBkSa s 5 88U 2 BBBms UI PIN 11 UNIT SWITCHED ON UI PIN 11 UNIT SWITCHED OFF F A gt 8 10 BEms CELE B X EEIE Umak 9 0014 B TT4U 7 6 8819 ERN 5 08kSa s 5 08 2 BBBms UI PIN 12 UNIT SWITCHED ON UI PIN 12 UNIT SWITCHED OFF FLOATING MEME lI 1 1 1 PUE a 5 m a aj namo age cra Ulam aam d 1 mI
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17. o T TIT ILL ILL LE LL 1 uid 1 2 PIN 1 SUPPLY TO TRANSDUCER J4 PIN 4 STROKING FACEPLATE SIGNAL FROM TRANSDUCER THE FOLLOWING IMAGES ARE SIGNALS TAKEN FROM THE POCKET DOPPLER FETAL TRANSDUCER 2MHZ Eug Cal Cm ec ru POI all mew cetacean 1 stalk lt L d lagu upra ae QI COLLECTOR QI BASE Measure 5 9210 2 834 0 CHi 5 000 2 5B CHi 2 86 288 Bnz Q1 EMITTER TRANSMITTER CIRCUIT VRF Q2 SOURCE Umalk 9 401 5 468U 3 Umak 8 281U 5 4860 i CHi 5 007 188 SET CHi 5 B88U TNR TRANSMITTER CIRCUIT TRANSMITTER CIRCUIT Q2 DRAIN Q3 COLLECTOR 02 GND F 504 8i i 296 Ens 440
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19. eqoJg 95 S 9 7 m 355 YSONGSNVAL JO IVNOLLO3S CWO 14 5 4 E 05 OWS NOH ae dO BO DENSO ON SONSGIJNOD NI SI SIHL OIOV Q3 AM3S3M 5 SEES ISWOD LGd S3l90 10NHO3L 5 S3ONVHTIOL NO 4350 Q vQNVIS 3iva 3nssi 842034289 aus uo Ouisn 40428uuo2 225 cpasn s 5 OU 40428uuo2 O4 uo j408u 9 ss d O 70 70 17 O4 Spue G Spua Pog 94 puo UO IZO INSU 430 SIM NIS ui 4addia43s p O Suisny pua WWO SaulM puo 917445 Aj n4eu0y jo 42914 pua o4 25012 sau 5 5 SV3N dia4S g OWS Y 49100 leus 403428uuo2 15 21902 NUS O4 2 102 puo eus 5 114 1 OVO ee 1 5 ____ 29 v
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22. SNOISN3WIQ 23 9 3755 SI OOUDN d 70 01 64 70 10 91 31 0 NOISSINY3d SH3NMO LHSIMAdOD JHL LNOHLIM 3Q0VN AVW NO3N3HL NMOHS 5 30 30 XO LNSWNOOd JHL 30 ON SONSGISNOD NI 5 LNSWNDOC SIHL 23 va 484205 243 30 pua 424 19 293 pua Auda uo 415 4039A 129 CGp 2414207 puo 4 4201 6ujsn uoi3sod ouaa u pnu 293 O4 aq pynoys 24014 4042a8uuo2 au 9 3 5 MOL 2 e3oN jf 39 oue 2 pod if oue 2 pod if 3461 oue pod oi 3464 oue 500590007 154295 OUIS OM y dob ou pjnous seus dojs jou pjnous jnq 218019 y 34 pinoys ejojd 94 1 455 YSONGSNVYL JO WNOILOSS 50 JO Jo ujyoq ejojdeop4 dubio 9195 JSO CW 991 uejubn y 95019 AHAS e3pjdeopj aod 403228uu02 3 ans 40H jeus eu
23. ISTE IUE 9 29 2 840 EL 2 6 AAE AY 21 i ST qm 8 1 aaa TRANSDUCER RECEIVER CIRCUIT TRANSDUCER RECEIVER CIRCUIT UI PIN 5 U1 PIN 6 LE S i TRANSDUCER RECIEVER CIRCUIT TRANSDUCER RECEIVER OUTPUT TO AUDIO UI PIN 7 BOARD PIN 4 NOISSIWM3d SH3NMO 1 5 JHL LNOHLIM JAVN AVW NO3N3HL NMOHS 5 30 30 XO LNSWNOOd JHL 30 ON SONSGISNOD NI 5 LNSWNDOC SIHL SOC CLLOLCd HSINIJ JAIVL3O OI L3N SNOISN3WIQ AI8N3SSV lVd3N39 TILIL JDJ 9800 uo uonisod jo dins umoys uonisod y y WDO pexopq uonisod jo duns 09 D 7 i m 99 enjbuedngs 93901 4 ujoq 859294 oju seui onsp d jo 4
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26. SI SIHL Q3 M3S34M 5 HSINIJ SSONAGSNYNL MavalllaWoo S3ISOTONHOSL GNNOSVULTN 5 gt 23 YALIN 842034289 aus uo Ouisn 40428uuo2 225 cpasn s 5 OU 40428uuo2 O4 uo j408u 9 Ug O4 Spue ul puo uoli40o aSul 430 SIM NIS ui 4addia43s p O Suisny pua WWO SaulM puo 91445 Aj n4eu0y ajqo2 pua aso Usauds AND wv ds WWCT Yvetno dia4S g OWJA 8 02 1245 HDOQ 40428uuo02 5 21002 ajqo2 O4 12 102 puo ays 290 YUOLDAUUOD 5 414 1 Ultrasound Technologies Ltd Lodge Way Portskewett Caldicot NP26 5PS United Kingdom Tel 01291 425425 Fax 01291 427093 Email ultratec doppler co uk Web www doppler co uk
27. 42 080 go teasa zi pi i EEE y gisva ds ee 8i O teeda Gz ely e dsi OO dsi SON sig 92450 6i 8 zledsiq wo eee a o O Cz nesa 01 6 d 92 ds we 204 ge 26 4 14 55 9 eledsiq P rend 4422 e eledsiq 22 9 ce PPA 4 Persa y ge 904 ZX gg V 0 49511 x 1909 99A 9 jp t 8 5 ee o s 5 wr 804 780 2 lt a OOF Ed OS018 HZ sofejdsig 204 uldsg 232 Taledsiq lt 494 denn 3 ng Jugo SE JU00 zavAeldsiq gt 104 ZHI ZL py 48 28 1 leds lt 28077 060 622 Mo gy 004 dA Peg sn an MOL MOL 9 129 615 2 DA 99A 97
28. Umak 1 161U 96 Umak 5 4810 5 3110 CHiz 1 08 164 SAMS CHi1 5 88 146 Hens TRANSMITTER CIRCUIT TRANSMITTER CIRCUIT Q3 BASE L2 PIN 1 DEN ARE f m CHR 9 57 48 B X 296 8ns _ 296 ns 18 70 G60 EXIT 5 _ P CUIU e 1 258 800 ni Umak 9 981 4 7984 Fred 2 8BBMH 9BB8 BmU Maus 4i 6TmU Fres 1 976MHs CHi 5 60817 188 2 5 CHi Mam 100 TRANSMITTER CIRCUIT TRANSMITTER CIRCUIT L2 PIN 3 TRANITTED SIGNAL L2 PIN 4 TT TT 1 CH1 2 504 85 504 0 gt 48 2 6 LED 296 226 6 20 AnS 2 Ans leas 1 258 _ 1 aY Umak T6B B mU 15 38 Fres 1 992MH 2 921 Uavas 2 143U CHi 1 004 188 SEIMSa CHi 1 880 188 RECEIVER CIRCUIT RECEIVER CIRCUIT Q5 GATE Q5 DRAIN ri a f 1 Ak 504 0ns_ m 584 PETERET PAR 2 40 B gt Y 1 964 E gt Y
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32. 5995 NOLLOnQOBNd3M ON 39N3QHNOO NI 5 4431904 SIHL d3OondadsNvasl Q3AM3S3M SIHOIM TV HSINIJ ON S3INOTONHOAL 5 5 420419109 061 OVallgNOO 941 S3ONVN310L SNOISN3AIQ i 3111 L QMVONVLS TOv vOTCIOZTS 225 OWS wop u SNV3al L ZHW A18W3SSV 310 452 ASONAGSNVAL 9 X 9 pod ado 5 0 39043 apisu 1104 SIUM smauss 2018 1 5 91 X2N 339 dwv D wopOupy payun apow nnd 40u gN ZHW 2 2 pue 5 9 95 wwg uonisod XZ J9A0D spod uo uj PUD duis S9JIM 5 ADMD O N AIRES U93IMS uonoeuuoo 10 JepbeH Y Y 10 amp 0TPO2ISNpunosoua30 p 40 aS 5 04 58114 06 vOLOOCLIS AIEGWASSV 43 39 YAIONGSNVYAL ZHNS MOVYELIENWOO SINAN SNOISN3MWIG 4203194109 NO 4350 x 0 0 5 225 1
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38. ee herer r rad a nr Pereri rs 9 1 1 1 Pirrrdrdd p qum e r e r qua os m D Pid MEME L 1111111 1 TP T Pr Pr PITE EL DEL P E so qm m lal UI PIN 3 UNIT SWITCHED ON UI PIN 3 UNIT SWITCHEDOFF 111131 U1 PIN 4 amp 6 GND x om op 1 ria A E rl rib Few i ror 1111971111 B TIMERE UI PIN 5 UNIT SWITCHED ON UI PIN 5 UNIT SWITCHED OFF Pid SS UI PIN7 amp 8 GND 2
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42. eu Cable Connections 1 1 Red 1 pad 2 Black 41 pad Screen J1 J1 pad 4 White V Ultrasound Technologies Ltd Page 10 of 32 PD1 FT120 service manual Issue 3 January 2007 Ultrasound Technologies Ltd 3 0 Circuit Description 3 1 Introduction The circuit has been divided into functional blocks with each block being described separately the blocks are as follows Audio Unit Power Supply Battery Low Indicator Ultrasound Transducer Oscillator and Detector Oscillator and Transmitter Amplifier Receiver and Detector Audio Amplifier Controls and Indicators UnitON OFF e Battery Low 3 2 Audio Unit Power S upply The unit operates from a single 9 Volt dry battery It is recommended that only alkaline cells be used The audio 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 threshol
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44. O LOL OOLGOZIS NOISSINNGd SM3NMO 1HOlMAdOO IHL LNOHLIM AVW NO3N3HL NMOHS SWL 30 XO 1N3An90Q0 JHL 30 ON SONSGISNOD NI 5 LNSWNDOC SIHL Q3 43S34M 4 9 SSISOTONHOSL GNNOSVYLIN HSINIJ AI8A3SSV WYANSS ON ONIMVYG MOVS81IVL3J SNOISN3WIQ TILIL 55 1 9qD 3 102 001 021 ees SS929J ul eqp 3404 1 J eJnoes si e qpo eunsuj episJepur RUNS 41 dous 250 0 uedo 13409 S929J Buiusom 91010 0 99JJ SLWINIOA eJunsuj Hi 93D20 ysnw 124205 SpiSdo 026 00100215 NMOHS SAU 3HL JO So INJAROO AHL JO JO ON 3ON3OlJNO9 NI 5 SI LNINNDOG SiHL 133HS AIBN3SSV IV833N3O9 d3 3S3H lt TV S3l9010NHO3L 5 MOV8IVL34 021 viad 23 NO 5 SNOISN3WIQ TUL 4O3HO SSONVYFIOL 15 WIYSLVAN ON N Y MOAHO 9800
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47. E E IB B Li DC signal showing supply voltage of 9V Location J1 PIN 1 Dc Signal showing supply voltage of 9V Location D1 PIN 1 ZEIT AY 9 1 3 8681 Q2 DRAIN 6 91 CHi 5 U3 PIN 1 Umak 9 0011 CHi 5 004 UI PIN 1 UNIT SWITCHED ON zi ET 188 _ B BAL T EEPEENELTT 2 160 6 250H2 Umaks 9 881 CHi 5 880 Q2 GATE H 2X 188 8mz _ 258 AV B 11 24 Hams CHi 5 60817 U3 PIN 3 62 2ml Umak 28B BmU CHi 5 00 UI PIN 1 UNIT SWITCHED OFF CEEE CELE CSET i F 188 9 _ EF 29 Ams 28 EENE EEE EEE 168 6 2 HH z Bim F F 7 180 CESE Bhul 59 2 A 150 z a oH zA AAL n B o B B3 m s y ERO C X L C ETE 1 I Z r E i 4 FF TT
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49. The rear panel will now come away revealing the P CB Remove the two M3 screws securing the PCB _ Off Fixing f 7 Ultrasound Technologies Ltd Page 8 of 32 PD1 FT120 service manual Issue 3 January 2007 Ultrasound Technologies Ltd Speaker wires 110mm long with 1 5 twist per Membrane tail folds through slot and into zif connector J2 Ensure that tne tail locates correctly into socket Do not crease the tail taill excess should be this side of PCB trap between both halves of the case during final assembly Note link pins 2 S 5 underside in recess provided in ca Note Cable must exit The transducers loudspeaker and battery connections are hard wired to the P CB De solder the connections at 4 retractile cable and J 3 loudspeaker the PCB can then be pulled clear of the case Ultrasound Technologies Ltd Page 9 of 32 PD1 FT120 service manual Issue 3 Janua
50. assembly 6 4 General Assembly 6 5 units General Assembly Drawings and Circuit Diagrams PD1 FT120 service manual Issue January 2007 O Ultrasound Technologies Ltd Lodge Way Portskewett Caldicot South Wales NP26 5PS United Kingdom T 44 0 1291 425425 44 0 1291 427093 ultratec doppler co uk www doppler co uk Ultrasound Technologies Ltd 1 General Introduction 1 1 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 Company 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 unit has been damaged notify your distributor or Ultrasound Technologies directly at the following address Ultrasound Technologies Ltd Lodge Way Portskewett Caldicot NP 26 5 5 South Wales UK Telephone 44 0 1291 425425 FAX 44 0 1291 427093 E mail service doppler co uk Retain the packing material for possible future use Important Note In the unlikely event that the instrument must
51. p SSS Se eee w UI PIN 14 UNIT SWITCHED UI PIN 14 UNIT SWITCHED OFF U2 PINS 2 amp 4 GND d d dod ee ee LETTET 4 E j i L L U2 PIN ISTROKING FACEPLATE aqu p diria IH 111191111 a qmm sqm meos gm s qp mt U2 PIN 6 SUPPLY a pm a m m 1 1 T U2 PIN 8 STROKING FACEPLATE St et tt 1 11111 URS SS SS ee 1 1 U2 7 I PILLE DE a SKI PINS 2 3 amp 4 STROKING FACEPLATE PIN 1 GND P 1 m opm c mq
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55. 9 28 EETAS I AR 1 250 1 256MH NS JI av 6 88 i bcn PEEL Umak 2 0010 1 9680 Umak 9 281 Uaug 5 914 Frea 2 BBBMH CHi 1 8BU 1BB ns 258MSa s 5 BBU TN RECEIVER CIRCUIT RECEIVER CIRCUIT Q4 GATE Q4 DRAIN 3 68 1 CHi 5 u8B8U RECEIVER CIRCUIT Q6 DRAIN 5 4221 188 E uu RM NERONE 2 1730 188 Umak 2 6014 CHi 5 00 RECEIVER CIRCUIT Q6 SOURCE eon er mag 3 1210 CHi 2 88U TRANSDUCER RECEIVER CIRCUIT UI PIN 2 A 2 Fres 2 F 204 Ans ZBB 296 gt 2 880 _ Ans isan 1 258 M EFESEEPERE rn 5 28 111 CHi 5 606 Fr 164 RECEIVER CIRCUIT Q6 GATE Umak 5 291 1 TRANSDUCER RECEIVER CIRCUIT UI PIN 1 ABMS t Doo ctr d Fe Ebr en Umaks 2 9210 CHi 1 BBU TRANSDUCER RECEIVER CIRCUIT UI PIN DEN 584 _ 2 3 BA gt F 25 20m5 _ 7 961 14 8 We 2 16U 25 00 7 B mi rr
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57. Electrolytic 16V Nippon Chemi con SRA 5 8 12 3 5mm Samsung SSM Capacitor luOF tant 35V case size A C411 2 Capacitor 100nF Mono Ceramic 0805 series 250 dielectric 1 2 3 7 10 26 22 24 8 Capacitor 10nF Mono Ceramic 0805 series X7R dielectric C18 1 22nF Mono Ceramic 0805 series X7R dielectric C6 13 2 1nO0F COG Ceramic 0805 series COG dielectric 9 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 470pF COG Ceramic 0805 series COG dielectric C21 1 680pF COG Ceramic 0805 series COG dielectric C16 1 IC Analogue TLO72CD SGS TI U1 1 Diodes BZX84C6V2 D1 1 Diodes BAT54 D2 1 Transistor MMBF4416LT1 Motorola 02 45 3 Transistor BC848B Q1 3 2 Inductor Toco 0838 L4 1 Inductor Toco 0842 L3 1 Inductor Toco 0841 El 1 Inductor Toco 0876 L2 1 Resistors 1 0805 10R Samsung Phillips ROHM R17 16 2 Resistors 1 0805 22R Samsung Phillips ROHM 7 1 Resistors 1 0805 100R Samsung Philips ROHM VR1 1 Resistors 1 0805 1 Samsung Phillips ROHM 83 8 2 Resistors 1 0805 1 5 Samsung Phillips ROHM 15 1 Resistors 1 0805 2 2 Samsung Phillips ROHM 1211 3 Resistors 1 0805 27K Samsung Phillips ROHM 14 1 Resistors 1 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 Technol
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59. JO eui eipjd 10j19euuoo 94 oj pue 104205 10 eu JO euo jo you A ddy inu IN iays uo jnojno Sjo s 199005 owe lays y 2 p s ejou osjo eqoud y ueewjeq 5 jo 94 euools jo 49409 eqoud uo 5504 god gt gt eqoud M8J9S 55 3 91 X KHAS 4 2 _____ MOSHO ay uo spod 04 25013 4 3 04 24205 4 o4 apis 43unou a2034ns 9u3 uo 99 aui O3 Spaau aacou6 uy qod uj apy 3auuo46 auonbs ayy 41 HUISUazUNOD 39 J eee aq pynoys 4a x2os au __ 4 Y O 3wos oa 0000 JI9NVv 000 HSINIJ S3ONV3310 L QNVONVIS WIYSLVAN 2 3U 30 5 aua uo spod 30 qod 294 o4 420440 04 pua 244 puo p4ooq aui 30 apis
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61. Ore I H ap py non SEE CUL wg 91 LNOSUSI ec sp 69 E ol asia ds ds i Sai ig d didus op 89 A 951 19510 E XL 26259 E yo MOL MOL ENMd ld 86 125 91 5 15 dq elidsia pr 029 61 MR amp tae i OO 4900 m 69 gt 9S 92 2 Xd 26259 669 8 G HOQV 10 ZAS 4900 m 20 09 ES ep 99 469 99A 2021 olodv yeubis jes i pwiAsdsiq 75 gp OWMd 0ld 19 Menas og S 9 410 222 4100 ae augo 55 969 559 19 2 oe 29 HR ET dg zy 56 4900 Zn 40001 vn wT gj 21 109 Fs ee TS 29 ETE NIZL 00d LAdA 0 A an 001 8 Z 9 8 L HIVLI34 SdS 9 YNOS 00 1001 ljowexsuogd Ken sei amp o ouuoe saues 021 x9eJ1e194 0 eunr indino ade
62. Ultrasound Technologies Ltd PD1 amp Fetatrack 120 series Dopplers Service manual PD1 FT120 service manual Issue January 2007 Ultrasound Technologies Ltd Lodge Way Portskewett Caldicot South Wales NP26 5 5 United Kingdom T 44 0 1291 425425 44 0 1291 427093 ultratec doppler co uk W www doppler co uk Ultrasound Technologies Ltd Products covered by this service manual Product Group P PD1 Product version Het 2 Product variation Babypulse home use doppler PD1 audio pocket Fetatrack 120 audio doppler mM c PD1dwr waterbirth C doppler PD1 fetal doppler with FHR display Fetatrack 120 fetal doppler with FHR PD1v flat probe vascular doppler PD1v vascular doppler Vascutrack 120 Fa vascular doppler PD1cv low cost vascular doppler PD1combi fetal vascular doppler PD1 FT120 service manual Issue January 2007 Ultrasound Technologies Ltd Lodge Way Portskewett Caldicot South Wales NP26 5 5 United Kingdom T 44 0 1291 425425 44 0 1291 427093 ultratec doppler co uk W www doppler co uk Ultrasound Technologies Ltd Products covered by this service manual The following products are manufactured by Ultrasound Technologies Lodge Way Portskewett NP26 5PS United Kingdom Tel 44 0 1291 425425 Fax 44 0 1291 427093 Email service doppler co uk Ultratec PDI seri
63. a 244 243 30 pua ayy uo 415 5 puo 243 24 40430A 41209 GGp 94201 30 apis 4unou a203ans puo 129 34 3307 uojsod aux uo punoa 03l48A u pnu au 04 Kay 4044 os aq aq pynoys 4014 40328uuo2 au 04 423 520S 294 04 gt 29440 YDYM 5 go Guo uuga 4 O4 5 S 42005 244 maus aqoud 293 wuo440qQ puo doz 4 o Buju 03 244 uo 5 244 puo a430 da20j 24 uo aapjnous au 3015 dol uua 9 293 y Eee Cs SIJOOUDN d pod ye woog oue pod ye oue 2 pod oue pod oue 5001550009 154505 9 1 OM 94 ueo jeq ou eq pjnoys Sjeus 991 dois you pjnous inq onspid eui 3 pinoys ejpjd 84 eJD s jeus 5 4addo 4 3 20S 4 JO S4204u02 WUO4400 a4 o 4apjos puo so pauu 5 5590 9 JO 59204 0 30 su436ua uugaxa nJ JeonpsuDJ 24 5 ue
64. ansducer Assembly Retractile Cable Connections pad 1 Red pad 2 Black pad 5 Screen pad 4 White e LJ e gt ME o o 210 nti 25 Skiffy gromet c x 12 C sk screw ne PCB assembly PCB and faceplate assembly fits over boss on probe cover CS Cable grommet slots into cutout provided on the probe Probe cover 22 4 Faceplate assembly 5 full nut Skiffy gromet TT u O TRANSDUCER ASSEMBLY complete Ultrasound Technologies Ltd Lodge Way Portskewett Caldicot South Wales NP26 5 5 United Kingdom T 44 0 1291 425425 44 0 1291 427093 ultratec doppler co uk W www doppler co uk 40 19905 SWEN 289 109w5 6661 5 Wd 77 89 01 00 81 6 5 seu uweJq 5 5
65. asound Technologies Ltd Lodge Way Portskewett Caldicot South Wales NP26 5PS United Kingdom T 44 0 1291 425425 44 0 1291 427093 ultratec doppler co uk www doppler co uk PD1 General Assembly Case front EHe Fibre washers 2 1 Audio assembly pn d E M3 x 6mm Pozi pan screws c w internal shakeproof washers E Cable assembly Case rear M4 x 12mm Pozi pan screw x3 Ultrasound Technologies Ltd Membrane Keypad Carefully feed the flexible tail through slot in case Do not bend or crease tail connector on fit into Remove backing marterial and apply membrane into recess Speaker wires connection detail J3 pin 1 Red J3 pin 2 Black Speaker wires TU E W Tl m NP me O Ultrasound Technologies Ltd Lodge Way Portskewett Caldicot South Wales NP26 5PS United Kingdom T 44 0 1291 425425 E ultratec doppler co uk W www doppler
66. 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 FT120 service manual Issue 3 January 2007 Ultrasound Technologies Ltd 11 Re Order Information Listed below are 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 and are here defined according to IEC60601 IEC Symbol 878 02 02 Type B Equipment IEC Symbol 348 Attention Consult accompanying documents Serial DATA 000 Volume Control Headset Output Dr Rear View of doppler Showing additional symbols Ultrasound Technologies Ltd Page 2 of 32 PD1 FT120 service manual Issue 3 January 2007 Ultrasound Technologies Ltd 1 3 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 product 15 classified as a Class A Gr
67. co uk L Secure pcb using 2 off 3 x 6mm pozi pan mu screws c w internal shakeproof washers N p Retractile cable connection detail J4 pin 1 Red J J4 pin 2 Black J4 pin 3 Screen J4 pin 4 White jo Note link pins 2 amp 5 underside Ir F 44 0 1291 427093 2 41 41 Membrane tail folds through slot and into zif connector J2 Ensure that the tail locates correctly into socket Do not crease the tail tail excess should be this side of PCB Do not trap between both halves of the case during final assembly Battery leads connection detail pin 1 Red pin 2 Black Wrap battery leads aroind post and secure with a cable tie Battery leads 140mm long with 1 5 twists per inch Offer cable assembly into position Cable grommet sits in recess provided in case Note Cable must exit left Ultrasound Technologies Ltd PD1 GA SS Membrane Keypad Freparation
68. d PD1 FT120 service manual Issue 3 January 2007 Ultrasound Technologies Ltd Page 22 of 32 Ultrasound Technologies Ltd 7 0 Circuit Diagrams amp Engineering Drawings The following section contains circuit diagrams and Engineering Drawings Ultrasound Technologies Ltd Page 23 of 32 PD1 FT120 service manual Issue 3 January 2007 Ultrasound Technologies Ltd PD1 Audio PCB Layout Ultrasound Technologies Ltd Page 24 of 32 PD1 FT120 service manual Issue 3 January 2007 Ultrasound Technologies Ltd e PD1 Audio PCB Layout GS Oo 0 Q D SK o m per ON m o OFS m 5 2 LLL 22 IB cs t o o M Hat u oni E203 COD s RB mi MH Il BB J2 5126 C en 5a EN Oc ats TITIT
69. d set by R10 and R11 7 3V the output state changes forcing the LED D2 to illuminate 3 4 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 FT120 service manual Issue 3 January 2007 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 amplifier 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 9 Oscillator and Transmitter Amplifier Field effect transistor Q2 with L1 C16 C17 and associated components form a Colpitts oscillator This oscillator runs ata nominal frequency of 2 5 or 8MH
70. es fetal and vascular dopplers Rotburg PDI series fetal dopplers Sibel PDI PDI series fetal dopplers Gima G2000 series fetal dopllers Gima V2000 seies vascular dopplers Fetatrack series fetal dopplers Vascutrack series fetal dopplers PD1 FT120 service manual Issue January 2007 O Ultrasound Technologies Ltd Lodge Way Portskewett Caldicot South Wales NP26 5PS United Kingdom T 44 0 1291 425425 44 0 1291 427093 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 l 1 6 Specification O U1 4 UJ Description of the 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
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72. g tables list some of the symptoms and the relevant circuit areas NOTE Do not under any circumstances attempt to repair the instrument whilst itis connected to a patient Symptom Suspect Circuit Check Unit does not switch ON Remote switch on front panel J 1 pin 1 goes low when switch is depressed U1 ON OFF Control Output goes low when switch 5 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 01 02 ON OFF Control Q2 must switch when switch 5 depressed Change battery Ultrasound OK butno 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 S K2 Audio signal on J 3 pin 1 Replace loudspeaker Unit unstable Ultrasound transducer Check output drive into crystal 15 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 Ultrasound Technologies Ltd Page 15 of 32 PD1 FT120 service manual Issue 3 January 2007 Ultrasound Technologies Ltd 6 0 Parts list The following section contains parts lists for the following items e PD1 Audio PCB assembly e PD1 Audio PCB assembly e PD12MHz Probe assembly e PD1 Final assembly e PD1 Fi
73. ing the DVM measure the DC voltage at the junction of C8 and R 7 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 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 Processor 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 adjust until the signal 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 FT120 service manual Issue 3 January 2007 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 at the rear of this manual In each case the re calibration must be carried out after any repair The followin
74. inuous wave fixed probe PD1 combi PD1 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 PD1 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 PD1v fetatrack 120 vascutrack 120 Yellow battery low LED PD1 PD1 combi PD1dwr fetatrack 120 3 digit FHR LCD display pulse icon Battery Low icon MN1604 PP3 9V Alkaline Manganese PD1 PD1v fetatrack 120 vascutrack 120 gt 9 hours 01 PD1dwr fetatrack 120 gt 8 hours Audio output to optional headset 1 PD1dwr fetatrack 120 RS232 interface to optional UltraTrace software PD1v not PD1v CAT vascutrack 120 Voltage output proportional to velocity of flow ABS 150mm by 75mm 2950 typically including transducer Class 1 Type B IEC 60601 1 Page 4 of 32 January 2007 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 BATTERY LOW VOLUME CONTROL HEADSET On Off control Ultrasound Technologies Ltd LED indicator to show when
75. nal assembly 6 1 PD1 Audio PCB Assembly Device Value Device Type Circuit Reference Quantity Capacitor 470uF Electrolytic Axial 10V Panasonic SU C10 1 ECEB1AU471 Capacitor 100uF Min Electrolytic 16V Nippon Chemi con SRA 2 9 11 12 13 18 19 21 27 28 29 30 32 33 17 5mm Samsung SSM 34 35 37 10uF tant 20V case size A AVX Kemet case size C5 15 16 1 0805 series Z5U dielectric C1 6 8 14 17 Ultrasound Technologies Ltd Page 16 of 32 PD1 FT120 service manual Issue 3 January 2007 Ultrasound Technologies Ltd IC Digital ICM7211AMIM44 Resistors 1 0805 MENT NI Resistors 1 0805 Resistors 1 0805 5 5 hillips R OHM R8 1 Resistors 1 0805 Resistors 1 0805 5 5 hillips RO HM 8 29 m Connector Wedwyz essen o PCB PD1 plus audio PD1109 Ultrasound Technologies Ltd Page 17 of 32 PD1 FT120 service manual Issue 3 January 2007 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 1 8 9 11 12 5 5mm Samsung SSM Capacitor 10 tant 20V AVX Kemetcase size A 13 14 2 Capacitor 0u47F tant 25V AVX KemetcasesizeA C4 5 2 Capacitor 1206 100nF Mono Ce
76. nd 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 FT120 service manual Issue 3 January 2007 4 0 4 1 4 2 4 3 4 4 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 that the whole test calibration procedure is undertaken Performance Checks The following procedure is intended to provide a means of determining the functional status of the unit It should be included as part of a preventative maintenance plan and should be performed on a regular basis at least 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 O
77. ogies Ltd PD1 FT120 service manual Issue 3 January 2007 Page 19 of 32 Ultrasound Technologies Ltd Faceplate PD1D102 1 Probe Cover PD1D101 2 M3 x16 Pozi C sk screw 1 M3 Full nut 1 Cover plug 2 Ultrasound Technologies Ltd Page 20 of 32 PD1 FT120 service manual Issue 3 January 2007 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 Pozi Pan 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 FT120 service manual Issue 3 January 2007 Ultrasound Technologies Ltd Page 21 of 32 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 1 PD1D108 1 M3 x 6 Pozi Pan 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 Lt
78. oup 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 Page 3 of 32 PD1 FT120 service manual Issue 3 January 2007 1 5 Ultrasound Frequency Series specifications 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 PD1 FT120 service manual Issue 3 Ultrasound Technologies Ltd 01 PD1dwr fetatrack 120 2 MHz continuous wave fixed probe PD1v PD1cv Vascutrack 120 5 or 8 MHz cont
79. ramic 1206 series 250 dielectric C6 8 9 10 15 5 Capacitor 1206 10nF Mono Ceramic 1206 series X7R dielectric 1 Capacitor 1206 luF Z5U Ceramic 1206 series Z5U dielectric 2 1 IC Analogue CD4013D P hilips Harris National U1 1 IC Analogue 2 330647 Zetex U3 1 IC Analogue LM386M 1 National U2 1 Diodes 108Q040 IR D1 1 Diode LED Yellow Temic TLLY4401 D2 1 Transistor RFD8P05SM Harris Q2 1 Transistor 55138 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 Phillips ROHM 10 1 Resistors 1 1206 4 7 Samsung Phillips ROHM 1112 2 Resistors 1 1206 100 Samsung Phillips ROHM _ R4 1 Resistors 1 1206 1 Samsung Phillips ROHM 3 5 6 7 4 Resistors 1 1206 3M3 Samsung Phillips ROHM 1 1 Volume Control 10K Log Tsubaya 161P N2 ATOK 1 Volume Control Knob Tsubuya 1KF 4B Black VR1 knob 1 J ack socket Hosiden HSJ 1501 010010 P12 2 Connector PP 3 battery connector 1 Connector Molex 3 way ZIF Molex 39 51 3032 2 1 PD1D103 PD1 Audio PCB 1 Ultrasound Technologies Ltd PD1 FT120 service manual Issue 3 January 2007 Page 18 of 32 Ultrasound Technologies Ltd 6 3 PD1 2MHz Transducer Assembly Description Device Type CircuitReference Quantity Capacitor 100uF Min
80. ry 2007 Ultrasound Technologies Ltd 2 6 Transducers The transducers are a Sealed unit However it is possible to gain access to the 2 MHz assembly 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 ASSEMBLY VIEW OF 2MHz DOPPLER TRANSDUCER M 16 long screv Pr O V SY 24 ZA Z SS ELEF yy 4 ZZZ b E 5 B Ne 2 7 7 S ERAI U SSS CW ISSN gt able grommet slots into I cutout provided on the probe 1 cover full nut Grommet 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 Apply 4 small droplets of RIV3140 as required in positions on the PCB to prevent microphony Form wires as shown to provide strain relief Scale X2 X RX Signal X Signal KX ir
81. scilloscope 2 channel 50 MHz bandwidth minimum resolution 5mV cm DC Power Supply 0 30VDC Digital Multimeter 4 Digit measuring 1mV 1mA 0 1ohm Frequency Counter 0 10MHz resolution at 2MHz 1KHz Signal Generator 10Hz to 10MHz 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 5 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 Ultrasound Technologies Ltd Page 13 of 32 PD1 FT120 service manual Issue 3 January 2007 Ultrasound Technologies Ltd Using a pair of tweezers Introduce noise into pin 4 of 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 1 and the ve lead to 1 pin 2 on the board under test Switch ON the power supply check the current being drawn by the board under test is less than 50 Us
82. the battery has reached a point when it requires changing Audio output for connection to a stereo headset for private listening Headset Output Battery Low ED Volume Control ON O Control Se q ae er 6 L jg Identification Ultrasound Technologies Ltd PD1 FT120 service manual Issue 3 January 2007 PD1 Babypulse fetal transducer Rotary edge potentiometer which increases or decreases the setting of the volume Fetatrack 120 fetal transducer H33n0SN v 1 Page 5 of 32 2 2 Ultrasound Technologies Ltd Audio Unit PD14 PD1dwr fetatrack 120 babypulse The following functions are found in the relevant page of the operating instructions UNIT ON OFF VOLUME CONTROL HEADSET RS 232 Interface FHR DISPLAY On Off control Rotary edge potentiometer which increases or decreases the setting of the volume Audio output for connection to a stereo headset for private listening Serial data output for connection to the optional ULTRATRACE 2 PC software Connections are made via the 3 5mm Stereo jack socket Custom LCD module displays FHR rate FH pulse and Battery condition Headse m Display Output e
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84. z producing a pulse wave of amplitude of approximately 5V The signal is then fed to output transistor Q3 that drives the transmitter crystal in the transducer The output power is set by VR 1 The signal is fed to the transducer via 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 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 complex 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 4KHz 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 ba
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