Seward fetatrack and vascutrack 120 dopplers
Contents
1. Loudspeaker 115mm 7000 1000 92 Wire 7 0 2 Single Black Loudspeaker 92mm 7111 1112 2 Screw Plated Brass PAN M2x12 7151 1306 2 Screw Stainless PAN M3x6mm 7151 4105 2 Screw Self Tap PAN N2x3 16in 7151 4506 4 Screw Self Tap PAN N4x1 4in type B 7153 1306 3 Screw Stainless CSK M3x6mm 7400 0001 3 Tyrap short type PLTIM 7441 2660 1 Grommet Extended Black Rubber 7441 3332 1 Grommet Extended Black Rubber 7704 0002 1 Spirol Pin Stainless 302 1 16 x 13 16 7711 3001 5 Insert Brass Sonicloc M3 Short 7900 0002 1 Adhesive Evostick Clear 0 05gm 7900 0007 Silastic Corning 3140 RTV 0 005gm 7900 0011 1 Double Sided Tape Pads File Q ethel serv qualsys servman FTVT120 doc Issue I March 96 Page 19 of 34 eu seward 0120 8201 Part No 0120 3404 0120 3422 1101 0010 1101 0102 1101 0103 1101 0104 1101 0121 1101 0224 1101 0273 1101 0560 1101 0561 1101 0683 1810 0103 2120 0108 2220 0107 2220 0476 2564 0228 2770 0472 2870 0103 2870 0104 4120 4148 4140 0051 4140 0056 4160 0181 Fetatrack Vascutrack 120 Series Service Manual AUDIO PCB ASSEMBLY fitted to FETATRACK variant only Qty Description 1 PD120 Audio PCB PD120 Volume Spacer Spacer for VR1 1 Resistor LR1 1 IR R5 2 Resistor LR1 1 1KO R2 8 1 Resistor LRI 1 10K RI 1 Resistor LR1 1 100K R10 1 Resistor LRI 1 120R R4 3 Resistor LR1 1 220K R11 12 14 1 Resistor LR1 1 27K R6 1 Resistor LRI 1 56R R2. p voce 02t0 A 3k JSQWNN Yugeunood S WVHOVIO LINDHIO Z80bd ZuM P S 81311 TYDOIGAW SNIT33VM lt LA0dNI H3A2IS28 PSL H3IJI IdWY SSVd GNV8 B23431934 45 1 wd vaseie 9H KINdiNO0 HZ3LLIWSNYSI TSI ONS XH ES L ONS XL ESL HELLIWSNVHL HOLYTTI9SO GLT TV3IG3 N ONI 134vM 30 HS LINDYID ALIDOWAZOIONY G3SM LN3NDdh0J Lex 18 88 58 3L 1561 3828 8218 BZ LOd OLI T1V3IG3AW ONI T3AVvM 1S3HJ H3BHNN_ ONIMVHO HDd WYYSVIO LINDHII 1HSIHAd0J NMYHO ZUJZAW _ UJLUJANOJ A d 1snrav nd ngo A 30 8A EN 2 kre NOI SHJANDJ A4 30 8q ade IAS 8 NZB6ZW7 E a V EJI s JEE ni d sc 7 D Zei gt 813 SCH i SB zaz lal deee HatAtm Eu 413 EJ _ x822 388 61H xm Bly W E eeng HEGE z I Q10HS3HHL ea aen T EHA azz Stu 9S3HNN Gie Fe jeyBedspno geen EA S_kLld 13 A orany n t Ze O z O S CD O i Zu Oy ZAS seuoydpesH T Naa 3 S3HNN 2 mo HDLYHYdWOJ 4183 08 HOLYTNS3H 430 inHs OLNY Na 8 bd Deg zza z gha kee Wh SEH Es maa naa Tasa zo neat Vgl naga 3981 al E Fa z gu we Sr SS T 0 L i T Ls gr LN If A ETYKA ga saua 968 det S3usNn ee LvBA lt We BE A ezu ei owej ear 80 V 31 S3UNN
3. 100V C5 Inductor 5S 0838 Toko L3 Inductor 5S 0842 Toko L1 L4 Link pins I and 2 on L1 Inductor 5S 0876 Toko L2 Diode BAT85 D1 Transistor BC182 TR2 FET M Type BF256A TR1 3 4 Analogue IC TL071CP IC1 Molex Wafer Right Angle 2 way PLI eu seward Fetatrack Vascutrack 120 Series Service Manual SECTION 7 DRAWINGS AND CIRCUIT DIAGRAMS The following is a list of schematic diagrams applicable to this section 0120 8202 0120 8204 0120 8207 0120 8201 0120 8201 0120 8205 2 MHZ Transducer Scematic 5 4 MHz Transducer Schematic 8 MHz Transducer Schematic PD 120 Audio PCB Overlay PD 120 Audio Velocity Schematic PD 120 Auto Off Audio Velocity Schematic File Q ethel serv qualsys servman FTVT120 doc Issue I March 96 Page 28 of 34 2028 0270 AJGQWNN ZUBWNIGO WYUSYIQO LINJHIJ JBOHd zZUWe WOIGAW SNIT133VM GN5_XU ESL CIMdNI BSSASBISSH FSI CONS XL ZEL UBIAITdWV SSVd GNVS ae UBLLIWSNVH1 lt ZSI td 9t CiNdine YJLLIWSNYYL 51 HOLY TIIDSO 2028 0270 JB8GWUNN 3Uu8WN2OQd WVHOVIO LINOHIO H30NQOSNVH1 ZHW 8 81371 SWALSAS VSIGSW OHVM3S H3I4HI IdWv SSVd QNV8 ZSL 7 1d CONS XH ESL lt IfdNi H3SAT3S3E PSI CONS Xi ESI UJAI3J3H HALLIWSNVHL HOLVTINISSO BEBO EM x e Juo ro HT THA s VISZ tol p BECH anot J 73 ereor 11 doze 29 M3IA AO0ISH3Q0NN GINdiN0 _B3LLIWSNYE PSL PT 1109 30 2 ONY 1 SNId MI 3LON
4. The output of this circuit is then scaled by R19 20 to 1mV kHz a suitable voltage level for most ECG machines and recorders 3 3 CONTROLS AND INDICATORS File Q ethel servqualsyswervmanVrTVT120 doc Issue 1 March 96 Page 8 of 34 eu seward 3 3 1 UNIT ON OFF Fetatrack Vascutrack 120 Series Service Manual A membrane switch is situated on the probe this switch grounds the gate of FET TR2 connecting the circuits to the power source releasing the switch will turn the unit off On later models a latch circuit has been provided depressing the switch once switches the unit ON depressing the switch a second time switches the unit OFF The latch circuit also has a time out period of approximately 5 minutes 3 3 2 BATTERY LOW The LED illuminates when the rail voltage from the battery falls too low for continued operation indicating that the battery should be changed File Q ethel servqualsyswervmanVrTVT120 doc Issue 1 March 96 Page 9 of 34 eu seward Fetatrack Vascutrack 120 Series Service Manual SECTION 4 TEST AND CALIBRATION 4 1 INTRODUCTION The following sections details 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 out to the power supply circuits then it is recommended that the whole test calibration procedure is undertaken 4 1 2 PERFORMANCE CHECKS The following procedure is intended to provide a means of determi
5. set correctly to match the transducer crystal impedance 3 2 5 RECEIVER AND DETECTOR The reflected Doppler signal is fed via a resonant transformer L3 C9 to the gate of TR4 the drain of this FET connects to the source of TR3 to form a cascode amplifier the drain of which contains the resonant circuit L4 C8 From the drain of TR3 the amplitude complex of the received signal is detected by passing the signal through diodeD1 with the high frequency signals being filtered by R7 and C10 their frequency breakpoint being at lkhz The raw low frequency heart complex is then amplified and filtered by IC1 where ts associated components form a bandpass 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 coiled cable 3 2 6 AUDIO AMPLIFIER After the audio signal has been detected in the transducer it is routed via the curly cable to PL1 pin 2 on the audio circuit board here it splits to feed the velocity processor tape recorder jack and via the volume control VR1 to the audio power amplifier ICT which feeds the loudspeaker 3 2 7 VELOCITY PROCESSOR One half of Op Amp IC2B forms a buffer amplifier to the incoming signal with a gain of 100 This amplified signal is then passed via the threshold control VR3 to the frequency to voltage converter IC3 The convertion factor is approximately 70mV kHz with fine adjustment provided by VR4
6. to a frequency of 1kHz and an amplitude of 15mV 1mV pk pk at pin 6 IC2B Move probe to pin 7 IC2B the voltage will be in the range 1 2 1 8V pk pk Set frequency to 10KHz and attach oscilloscope to pin 7 IC3 and adjust VR3 until IC3 Pin 7 just changes state from 0V to D C level between 400 900mV The signal will be rough DC Using the multimeter with ve probe connected to C3 ve and ve probe to the Junction of R18 R19 and C19 adjust VR4 until the until the DC level measures 700 mV 2mV Set the frequency to 1KHz and check that the multimeter now reads 70mV 4mV 4 7 TRANSDUCER OSCILLATOR AND TRANSMITTER Using the multimeter measure the voltdrop across R6 This must be no greater than 0 6 V dc Turn VRI fully anticlockwise and connect the oscilloscope to TP1 the signal must be an undistorted sinewave of 1 7 to 2 2 Mhz or 5 4 amp 8mhz depending on transducer and of amplitude greater than 1 7V File Q ethel serv qualsys servman FTVT120 doc Issue I March 96 Page 11 of 34 eu seward Fetatrack Vascutrack 120 Series Service Manual Replace oscilloscope with the frequency counter and adjust L1 for the correct operating frequency of the crystal faceplate at TP4 Using the oscilloscope connected across output to the transmitter crystal TS1 TS2 on edge of PCB Adjust VR1 and peak L2 to result in an output of 1 5V pk pk 4 8 TANSDUCER RECEIVER AND DETECTOR Attach oscilloscope probe to the drain of TR3 TP5 and adjus
7. 000 5504 0004 5810 0000 6520 0225 7000 0100 7000 0200 7000 1000 7000 3000 7000 5000 7071 0010 7151 1306 7151 4506 7153 1306 7400 0001 7704 0002 7711 3001 7900 0002 0120 8205 Qty Description PD120 Front Cover Stainless PD120 Rear Cover Stainless PD120 Clip Blanking Plate PD120 Pocket Clip PD120 Pocket Clip Spring PD120 Body Moulding PD120 Battery Slide PD120 Speaker Clamps PD120 Audio Velocity PCB Assembly Molex Housing 8 way Molex Crimps Lemo Socket 4 way EGGOB304CNL Battery Connector PP3 Loudspeaker round 2 25inc Wire 7 0 2 Single White Lemo 103mm 115 Wire 7 0 2 Single Pink Loudspeaker 115mm 195 Wire 7 0 2 Single Black Loudspeaker 92mm Lemo 103mm 103 Wire 7 0 2 Single Red Lemo 103mm 103 Wire 7 0 2 Single Yellow Lemo 103mm 28 Sleeving Helsin 1mm 4 Lengths of 7mm Screw Stainless PAN M3x6mm Screw Self Tap PAN N4x1 4in type B Screw Stainless CSK M3x6mm Tyrap short type PLTIM Spirol Pin Stainless 302 1 16 x 13 16 Insert Brass Sonicloc M3 Short Adhesive Evostick Clear OR RE OOM A MR M R bet M R R LA CO r GA AW AUTO OFF AUDIO VELOCITY PCB ASSEMBLY fitted to units with an interchangeable transducer only Part No 0120 3405 0120 3422 1101 0010 1101 0102 1101 0103 Qty Description 1 Audio PCB un populated 1 PD120 Volume Spacer Spacer for VR1 1 Resistor LR1 1 IR R5 4 Resistor LR1 1 1KO R2 8 17 20 2 Resistor LR1 1 10K R1 18 File Q ethel serv quals
8. 100V C10 Inductor 5S 0838 Toko L3 Inductor 5S 0841 Toko LI Inductor 5S 0842 Toko L4 Inductor 5S 0876 Toko L2 Diode BAT85 DI Transistor BC182 TR2 FET M Type BF256A TR1 3 4 Analogue IC TL071CP JC Molex Wafer Right Angle 2 way PL1 eu seward 0120 0007 Part No 0120 1505 0120 1521 0120 3276 0120 3418 0120 8402 0120 8504 7111 1112 7151 4105 7441 3332 7900 0007 7900 0011 0120 8204 Part No 0120 3410 1201 0100 1201 0101 1201 0102 1201 0220 1201 0224 1201 0272 1201 0682 1330 0102 2220 0107 2250 0474 2330 0106 2564 0228 2564 4710 2770 0101 2770 0102 Fetatrack Vascutrack 120 Series Service Manual 5 4 MHz TRANSDUCER Qty Description PD120 Vascular Probe Switch 5 4 MHz 31 Series Serial Number Label PD120 Probe Cable Clamp PD120 Probe Cover PD120 Retractile Cable Assembly 5 4MHz Cradle assy Screw Plated Brass PAN M2x12 Screw Self Tap PAN N2x3 16in Grommet Extended Black Rubber Silastic Corning 3140 RTV Double Sided Tape Pads YN NR R R R 5 4 MHZ TRANSDUCER PCB ASSEMBLY Qty Description 1 PD120 Probe RF PCB 1 Resistor RGP0204 1 10R R3 1 Resistor RGP0204 1 100R R8 1 Resistor RGP0204 1 1K R11 1 Resistor RGP0204 1 22R R6 6 Resistor RGP0204 1 220K R4 5 7 9 10 12 1 Resistor RGP0204 1 2K7 R2 1 Resistor RGP0204 1 6K8 RI 1 Singleturn Pot 1K VRI 1 Electrolytic 100uF 10V C15 1 Electrolytic 0 47uF 50V C13 1 Tantalum 10uF 16V 499D C1 1 Poly
9. 3 1 Resistor LRI 1 560R R9 1 Resistor LRI 1 68K R7 and link VR2 1 Volume Rotary Edge 10K LOG PC 908 VRI 1 Electrolytic 1000uf 10V Axial C3 6 Electrolytic 100uF 10V C1 2 7 9 12 13 1 Electrolytic 47uF 10V 509D C8 1 Polyester 10 220nF C11 1 Ceramic Axial 4700pF 50 100V C10 1 Ceramic Radial 10nF 100V C14 3 Ceramic Radial 100nF 100V C4 5 6 1 Diode 1N4148 D3 1 Diode Zener BZX79 B5V1 2 1 Diode Zener BZX79 C5V6 D1 1 Varistr S1OV S07K11 File Q ethel serv qualsys servman FTVT120 doc Issue I March 96 Page 20 of 34 eu seward Fit across R 10 4210 0183 1 Transistor BC183C TRI 4250 0300 1 FET V Type VPO300M TR2 4310 0820 1 Analogue IC TBA820M IC1 4310 1458 1 Analogue IC MC1458 CP IC2 4410 0540 1 Led Single Yellow 2mm LED1 5222 0008 1 Molex Wafer Right Angle 8 way PLI 5404 2001 2 _ Jack Socket 3 5mm Stereo pc JK1 2 File Q ethel serv qualsys servman FTVT120 doc Issue 1 March 96 Fetatrack Vascutrack 120 Series Service Manual Page 21 of 34 eu seward 0120 0002 Part No 0120 1502 0120 1520 0120 3276 0120 3418 0120 8402 0120 8503 7111 1112 7151 4105 7441 3332 7900 0011 0120 8202 Part No 0120 3410 1201 0100 1201 0101 1201 0102 1201 0220 1201 0224 1201 0272 1201 0682 1330 0102 2220 0107 2250 0474 2330 0106 2564 0228 2564 4710 2770 0122 2770 0221 2770 0222 Fetatrack Vascutrack 120 Series Service Manual 2 Mhz TRANSDUCER Q
10. 5 1 4322 4013 1 4410 0540 1 5222 0008 1 5404 2001 2 File Q ethel serv qualsys servman FTVT120 doc Issue I March 96 Page 18 of 34 Fetatrack Vascutrack 120 Series Service Manual C17 Diode 1N4148 D3 5 6 Diode Zener BZX79 B5V1 2 D2 Diode Zener BZX79 C5V6 D1 4 Varistor SIOV S07K11 Fit across R 10 Transistor BC183C TRI FET V Type VPO300M TR2 Analogue IC TBA820M IC Analogue IC MC1458 CP IC2 Analogue IC LM2907N8 IC3 Analogue Surface Mount IC ICM7555 IBA IC5 CMOS Surface Mount IC MC14013BD IC4 Led Single Yellow 2mm LED1 Molex Wafer Right Angle 8 way PLI Jack Socket 3 5mm Stereo pc eu seward Fetatrack Vascutrack 120 Series Service Manual 0120 0004 2MHz DEDICATED ASSEMBLY Part No Qty Description 0120 1003 1 PD120 Front Cover Stainless 0120 1004 1 PD120 Rear Cover Stainless 0120 1005 1 PD120 Clip Blanking Plate 0120 1010 1 PD120 Pocket Clip 0120 1401 1 PD120 Pocket Clip Spring 0120 1502 1 PD120 Probe Membrane Switch 0120 3276 1 PD120 Probe Cable Clamp 0120 3414 1 PD120 Body Moulding 0120 3415 1 PD120 Battery Slide 0120 3418 1 PD120 Probe Cover 0120 3425 4 PD120 Speaker Clamps 0120 5001 1 PDI20Retractile Cable 0120 8201 1 PD120 OB Audio Circuit Assembly 0120 8503 1 2MHzCradle assy 5211 0008 1 Molex Housing 8 way 5250 0000 8 Molex Crimps 5810 0000 1 Battery Connector PP3 6500 0001 1 Speaker Cloth 65mm x 65mm 6520 0225 1 Loudspeaker round 2 25inc 7000 0200 115 Wire 7 0 2 Single Pink
11. FET Gate goes low when switch depressed Source goes to 0 2V of Drain File Q ethel serv qualsys servman FTVT120 doc Issue I March 96 Page 13 of 34 eu seward Fetatrack Vascutrack 120 Series Service Manual es PLI KE OGN Low LED on EE condition ann pin 7 gt 7V permanantly IC2 A Comparator See test calibration section eet battery drain Turn Off circuit TR2 Gate of TR2 must be at same level as drain Change battery Unit unstable Ultrasound transducer Replace transducer TR2 Emitter 5V Collector gt 7V 0000000000 Battery condition PLI pin 7 gt 7V File Q ethel serv qualsys servman FTVT120 doc Issue I March 96 Page 14 of 34 eu seward Fetatrack Vascutrack 120 Series Service Manual SECTION 6 PARTS LISTS PART No DESCRIPTION 0120 0003 AUDIO UNIT ASSEMBLY 0120 8205 AUTO OFF AUDIO VELOCITY PCB ASSEMBLY 0120 0004 DEDICATED 2MHz ASSEMBLY 0120 8201 AUDIO PCB ASSEMBLY 0120 0002 2 MHz TRANSDUCER ASSEMBLY 0120 8202 2 MHz TRANSDUCER PCB ASSEMBLY 0120 0007 5 4 MHz TRANSDUCER ASSEMBLY 0120 8204 5 4 MHz TRANSDUCER PCB ASSEMBLY 0120 0038 8 MHz TRANSDUCER ASSEMBLY 0120 8207 8 MHz TRANSDUCER PCB ASSEMBLY File Q ethel serv qualsys servman FTVT120 doc Issue I March 96 Page 15 of 34 eu seward Fetatrack Vascutrack 120 Series Service Manual 0120 0003 AUDIO UNIT ASSEMBLY Part No 0120 1003 0120 1004 0120 1005 0120 1010 0120 1401 0120 3414 0120 3415 0120 3425 0120 8203 5211 0008 5250 0
12. ation of the instrument If your instrument does not exactly match the manual contact the manufacturer or distributor for revision information Inspect the instrument upon receipt for damage dents or scratches If damage is found notify SEWARD MEDICAL SYSTEMS promptly at the following address Seward Medical Systems Ltd Techbase Cleppa Park Newport Gwent NP1 9UG United Kingdom Telephone 01633 810770 FAX 01633 810498 Retain the packing material for possible future use In the unlikely event that the instrument must be returned to for service or shipped for any other reason use the same packing material in which the instrument was delivered If this is not available the instrument should be packaged in a proper size box with adequate protective padding 1 1 RE ORDER INFORMATION Listed below are the consumables used with the FETATRACK VASCUTRACK 120 series Pocket Dopplers complete with part numbers for ease simplification of ordering Part Number Description 9000 0005 Aquasonic Gel 0 25L 9000 0006 Aquasonic Gel 60 gm 9020 1604 MN1604 Alkaline Battery File Q ethel serv qualsys servman FTVT120 doc Issue I March 96 Page 4 of 34 eu seward 1 2 SYMBOLS Fetatrack Vascutrack 120 Series Service Manual The following symbol has been used on the rear of the FETATRACK VASCUTRACK 120 and is here defined according to IEC601 and B S 5724 IEC Symbol 878 02 02 Type B Equipment 1 3 CE MARK As indicated in the op
13. erating manual and identified on the outer packing this product complies with the essential requirements of the European Council Directive 89 336 EEC relating to EMC 13 1 Guidelines for identifying and resolving adverse EMC conditions This product is classified as a Class A Group 1 type of product according to EN55011 This product is allowed in domestic establishments under the juristiction of a Healthcare professional 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 unit s EM immunity during routine operation we suggets that the source of EM distrubance is identified and it s emmisions reduced If the user has any doubt regarding the identification and resolution of adverese EM conditions they should contact Seward Medical Systems directly who will advise on the situation The address can be found in the front of this manual File Q ethel serv qualsys servman F TVT120 doc Issue 1 March 96 Page 5 of 34 eu seward Fetatrack Vascutrack 120 Series Service Manual SECTION 2 DESCRIPTION OF THE INSTRUMENT 2 1 AUDIO UNIT BATTERY LOW LED indicator to show when the battery has reached a point when it
14. ester 10 220nF C14 1 Polyester 10 4n7 C11 1 Ceramic Axial 100pf 50 100 C8 1 Ceramic Axial 1000pF 50 100V File Q ethel serv qualsys servman FTVT120 doc Issue I March 96 Page 24 of 34 eu seward 2770 0181 1 2770 0330 1 2770 0470 1 2870 0103 1 2870 0104 2 2870 0681 1 2870 0820 1 3005 0838 1 3005 0841 1 3005 0842 1 3005 0876 1 4110 0085 1 4210 0182 1 4230 0256 3 4310 0071 1 5222 0002 1 File Q ethel serv qualsys servman FTVT120 doc Issue I March 96 Page 25 of 34 Fetatrack Vascutrack 120 Series Service Manual C16 Ceramic Axial 180pF 100V C5 Ceramic Axial 33pF 50 100 C9 Ceramic Axial 47pF 50 100V C3 Ceramic Radial 10nF 100V C4 Ceramic Radial 100nF 100V C7 12 Ceramic Radial 680pF 100V C10 Ceramic Radial 82pF 50 100V C2 Inductor 5S 0838 Toko L3 Inductor 5S 0841 Toko LI Inductor 5S 0842 Toko L4 Inductor 5S 0876 Toko L2 Diode BAT85 D1 Transistor BC182 TR2 FET M Type BF256A TRI 3 4 Analogue IC TL071CP IC Molex Wafer Right Angle 2 way eu seward 0120 0038 Part No 0120 1522 0120 1524 0120 3276 0120 3418 0120 8402 0120 8506 7111 1112 7151 4105 7441 3332 7900 0011 0120 8207 Part No 0120 3410 1201 0100 1201 0101 1201 0102 1201 0220 1201 0224 1201 0272 1201 0682 1330 0102 2220 0107 2250 0474 2330 0106 2564 0228 2564 4710 2770 0102 2770 0180 2770 0271 Fetatrack Vascutrack 120 Series Service Manual 8 MHz TRANSDUCER Qty Description 32 Series Seria
15. eu seward Fetatrack Vascutrack 120 Series Service Manual FETATRACK amp VASCUTRACK 120 SERIES SERVICE MANUAL File Q ethel serv qualsys servman FTVT120 doc Issue 1 March 96 Page 1 of 34 eu seward CONTENTS Section 1 General Introduction 1 0 Introduction 1 1 Re Order Information 1 2 Symbols Section 2 Description of the Instrument 2 1 Audio Unit 2 2 Dismantling Instructions 2 3 Audio Unit 2 4 Transducers Section 3 Circuit Description 3 1 Introduction 3 2 Audio Unit Power Supply 3 21 Battery Low Indicator 3 2 2 Ultrasound Transducer 3 2 3 Oscillator and Detector 3 2 4 Oscillator and Transmitter Amplifier 3 2 5 Receiver and Detector 3 2 6 Audio Amplifier 3 2 7 Velocity Processor 3 3 Controls and Indicators 3 3 1 Unit ON OFF 3 3 2 Battery Low Section 4 Test and Calibration 4 1 Introduction 4 1 2 Performance Checks 4 2 Test Procedure 4 2 1 Equipment 4 2 2 Audio Unit Power Supply 4 3 Battery Low Indicator 4 4 Active Regulator 4 5 Audio 4 6 Velocity Processor 4 7 Transducer Oscillator and Transmitter 4 8 Transducer Receiver and Detector Section 5 Fault Finding 5 1 Fault Finding Guidelines 5 1 2 Ultrasound Transducer 5 1 3 Audio Unit File Q ethel serv qualsys servman FTVT120 doc Issue 1 March 96 P AAAA O XO XO OO OO OO JJ JJ 10 10 10 10 10 10 11 11 11 11 12 13 13 13 Fetatrack Vascutrack 120 Series Service Manual Page 2 of 34 eu seward Sect
16. ion 6 Parts Lists 0120 0003 PD120 Audio Unit Assembly 0120 8205 PD120 Auto Off Audio Velocity PCB Assembly 0120 0004 Dedicated 2 MHz Assembly 0120 8201 PD120 Audio PCB Assembly 0120 0002 2 MHz Transducer Assembly 0120 8202 2 MHz Transducer PCB Assembly 0120 0007 5 4 MHz Transducer Assembly 0120 8204 5 4 MHz Transducer PCB Assembly 0120 0038 8 MHz Transducer Assembly 0120 8207 8 MHz Transducer PCB Assembly Section 7 Drawings and Circuit Diagrams 0120 8202 2 MHZ Transducer Scematic 0120 8204 5 4 MHz Transducer Schematic 0120 8207 8 MHz Transducer Schematic 0120 8201 PD 120 Audio PCB Overlay 0120 8201 PD 120 Audio Velocity Schematic 0120 8205 PD 120 Auto Off Audio Velocity Schematic File Q ethel serv qualsys servman FTVT120 doc Issue I March 96 16 16 19 20 22 22 24 24 26 26 29 30 31 32 33 34 Fetatrack Vascutrack 120 Series Service Manual Page 3 of 34 eu seward Fetatrack Vascutrack 120 Series Service Manual SECTION 1 GENERAL INTRODUCTION 1 0 INTRODUCTION This service manual is written to aid in the maintenance and repair of the SEWARD MEDICAL SYSTEMS FETATRACK and VASCUTRACK 120 series of 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 but the manufacturer reserves the right to make changes to improve the oper
17. l Number Label PD120 Vascular Probe Switch 8 MHz PD120 Probe Cable Clamp PD120 Probe Cover PD120 Retractile Cable Assembly 8MHz Cradle assy Screw Plated Brass PAN M2x12 Screw Self Tap PAN N2x3 16in Grommet Extended Black Rubber Double Sided Tape Pads M N N M M M 8 MHz TRANSDUCER PCB ASSEMBLY Qty Description 1 PD120 Probe RF PCB 1 Resistor RGP0204 1 10R R3 1 Resistor RGP0204 1 100R R8 1 Resistor RGP0204 1 1K R11 1 Resistor RGP0204 1 22R R6 6 Resistor RGP0204 1 220K R4 5 7 9 10 12 1 Resistor RGP0204 1 2K7 R2 1 Resistor RGP0204 1 6K8 RI 1 Singleturn Pot 1K VRI 1 Electrolytic 100uF 10V C15 1 Electrolytic 0 47uF 50V C13 1 Tantalum 10uF 16V 499D C1 1 Polyester 10 220nF C14 1 Polyester 10 4n7 Cll 1 Ceramic Axial 1000pF 50 100V C16 1 Ceramic Axial 18pF 50 100V C9 1 Ceramic Axial 270pF 50 100V File Q ethel serv qualsys servman FTVT120 doc Issue I March 96 Page 26 of 34 eu seward 2770 0330 1 2770 0470 1 2870 0103 1 2870 0104 2 2870 0681 1 2870 0820 1 3005 0838 1 3005 0842 2 3005 0876 1 4110 0085 1 4210 0182 1 4230 0256 3 4310 0071 1 5222 0002 1 File Q ethel serv qualsys servman FTVT120 doc Issue I March 96 Page 27 of 34 Fetatrack Vascutrack 120 Series Service Manual C2 Ceramic Axial 33pF 50 100 C8 Ceramic Axial 47pF 50 100V C3 Ceramic Radial 10nF 100V C4 Ceramic Radial 100nF 100V C7 12 Ceramic Radial 680pF 100V C10 Ceramic Radial 82pF 50
18. nd press it out of the cradle File Q ethel seruqualsyNservmanFTVT 120 doc Issue I March 96 Page 6 of 34 eu seward Fetatrack Vascutrack 120 Series Service Manual SECTION 3 CIRCUIT DESCRIPTION 3 1 INTRODUCTION The circuitry 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 Velocity Processor Controls and Indicators Unit ON OFF Battery Low 3 2 AUDIO UNIT POWER SUPPLY The unit operates from a 9 Volt dry battery it is recommended that only Alkaline cells be used The audio circuits are fed directly while the transmitter receiver circuits are via a nominal 5V regulator formed around TRI The unit is turned on by a membrane which is mounted on the probe cover Closing the switch grounds the gate of VFET TR2 The unit turns off when the switch contacts are released Some models are fitted with a latch On circuit These models stay On for approximately 5 minutes afterwhich they turn Off automatically 3 2 1 BATTERY LOW INDICATOR IC2a is connected a voltage comparator with D2 as the reference voltage When the power rail falls below the threshold set by R6 amp R7 the LED1 turns on indicating that the battery requires changing 3 2 2 ULTRASOUND TRANSDUCER The ultrasound transducer operate
19. ning 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 Connect the transducer to the unit and press the switch to turn the unit on Increase the volume to to maximum The battery low light will flash ON for about 5 seconds and then go out Place transducer with ultrasound gel on the palm of the hand over the radial artery a clear pulse will be heard 4 2 TEST PROCEDURE 4 2 1 EQUIPMENT Oscilloscope 2 channel 50 MHz bandwidth minimum resolution 5mV cm Digital Multimeter 4 Digit measuring ImV ImA 0 lohm Frequency Counter 0 1OMHz resolution at 2MHz 1KHz Signal Generator 10Hz to 1OMHz ImV to 10V Sinewave 4 2 2 AUDIO UNIT POWER SUPPLY Connect a DC voltage source adjusted to 9V 50mV in place of the dry battery and shorting link between pins 3 and 4 on the connector PL1 Place multimeter probes across C3 The voltage at this point must be no more than 0 2V less than input voltage from the DC power source 4 3 BATTERY LOW INDICATOR NOTE DURING THESE TESTS C13 MUST BE REMOVED FROM THE CIRCUIT Connect multimeter negative ve probe to C3 ve Reduce DC Power source to give 7 0V 10mV at C3 ve and adjust VR2 until LED D3 just turns on The voltage at IC2 pinl must be greater than 5 volts File Q ethel serv qualsys servman FTVT120 doc Issue I March 96 Page 10
20. of 34 eu seward Increase voltage to give 7 2 V 10mV at C3 ve and LED D3 must turn OFF The voltage at IC2 pin must be less than 2 9 V Fetatrack Vascutrack 120 Series Service Manual Connect C13 into the circuit and adjust the DC power source for 7 0V 10mV at C3 ve The LED D3 must light within 20 seconds Increase the voltage to 7 2V 10mV at C3 ve and the LED D3 must turn off within 20 seconds 4 4 ACTIVE REGULATOR Connect 270 ohm 0 5 watt resistor between pins 1 and 4 on the connector PL1 With DC input voltage at C3 ve set to 7 6V 10mV attach multimeter probe to PL1 pinl yellow wire The voltage must be between 4 6 and 5 2 volts Increase DC input voltage to 9V 50mV With the multimeter still attached to PLI pin 1 the DC voltage must not rise to greater than 5 6 Volts 4 5 AUDIO Connect 8 ohm I watt resistor in place of the loudspeaker between pins 5 and 6 on the connector PL1 and using the A F signal generator inject a 500Hz sinewave of 100mv peak to peak into Junction of VR1 and C6 Set VR1 to Maximum Connect oscilloscope across 8 ohm resistor and with the voltage at C3 ve set to between 8 6 and 9v the resulting signal must be between 4 0 and 4 8 Volts peak to peak with no visible distortion Increase input signal until the signal clips The measured voltage must be greater than 7 volts pk pk 4 6 VELOCITY PROCESSOR With oscilloscope set to AC input adjust input signal from audio generator
21. requires changing VOLUME Rotary edge potentiometer which increases or decreases the setting of the volume HEADSET An audio output for connection to an audio stethoscope for private listening TAPE OUTPUT 3 5mm Stereo jack for connection to a standard tape recorder in mono on the Ring of the stereo Jack is the Waveform output for connection to an ECG recorder TRANSDUCER CONNECTOR For the connection of any compatible Seward Medical Systems detection transducer Note some variants have a fixed transducer 2 2 DISMANTLING INSTRUCTIONS Note Before dismantling the unit unplug the transducers and accessory cable if present 2 3 AUDIO UNIT The Audio unit houses the main circuit board to remove the circuit board turn the unit on it s front and remove the three M3 countersunk screws The back panel will now come away revealing the reverse side of the PCB Remove the two M3 screws securing the PCB The PCB is attached to the unit via an 8 way connector carefully remove the connector and the PCB can be pulled clear of the case 2 4 TRANSDUCERS Circuit board removal is carried out by unscrewing the two M2 screws in the end of the probe cover and carefully sliding the probe cover back up the cable This will reveal the circuit board mounted in it s cradle WE DO NOT recommend removing this from the cradle however if it is necessary to do so with extreme care unsolder ALLthe wires cable and faceplate terminations joining the PCB a
22. s on the continuous wave Doppler principle and consists of a single half disc transmitter crystal whose beam is focused by angling and a half disc receiver crystal The transducer operates at a nominal frequency of 2 0 5 4 or 8 MHz 3 223 OSCILLATOR AND DETECTOR The oscillator and detector is built up of four discrete sections These are the master oscillator transmitter amplifier receiver amplifier and detector These operate to produce a continuous wave ultrasound signal that is passed to the transmitting crystal in the transducer File Q ethel serv qualsys servman F TVT120 doc Issue 1 March 96 Page 7 of 34 eu seward 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 Fetatrack Vascutrack 120 Series Service Manual 3 2 4 OSCILIATOR AND TRANSMITTER AMPLIFIER Field effect transistor TR1 with LI C2 C3 and associated components form a Colpitts oscillator This oscillator runs at a nominal frequency of 2 5 4 or SMHz producing a sinewave of amplitude of approximately 2V This signal is then fed to output transistor TR2 which drives the transmitter crystal in the transducer The output power isvaried by adjustment of VR1 during test The signal is fed to the transducer via a tuned transformer L2 C5 the output impedance of which is
23. t L3 and L4 for maximum signal Move oscilloscope probe to junction of D1 and R7 TP7 The measured output will be a DC voltage of greater than 5 5V File Q ethel serv qualsys servman FTVT120 doc Issue I March 96 Page 12 of 34 Bu seward Fetatrack Vascutrack 120 Series Service Manual SECTION 5 FAULT FINDING 5 1 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 Section 7 In each case the recalibration 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 5 1 2 ULTRASOUND Symptom Suspect Circuit Check Ultrasound does not function Transducer Try another transducer Transmitter Receiver Transmitter drive TS1 TS2 3V pk pk See Ultrasound calibration tests Baton Offetmait On Off circuit ww of TR1 in audio circuit EE OK but no audio een position ee position transducer Crackling operation of Replace volume control volume control VR1 Broken coductor in cable Check audio signal on pin 3 of IC 1 Headphone socket SK2 Audio signal on PLI pin 5 Loudspeaker a a ZDJ 5 1 3 AUDIO UNIT Symptom Suspect Circuit Check Unit does not switch ON Remote switch on transducer PL1 pin 3 goes low when switch depressed TR2 V
24. ty Description Screw Plated Brass PAN M2x12 Screw Self Tap PAN N2x3 16in Grommet Extended Black Rubber Double Sided Tape Pads 1 Probe Membrane Switch 1 30 Series Serial number Label 1 PD120 Probe Cable Clamp 1 PD120 Probe Cover 1 PD120 Retractile Cable Assembly 1 2MHz Cradle assy 2 2 1 1 2 MHz TRANSDUCER PCB ASSEMBLY Qty Description 1 PD120 Probe RF PCB 1 Resistor RGP0204 1 10R R3 1 Resistor RGP0204 1 100R R8 1 Resistor RGP0204 1 1K R11 1 Resistor RGP0204 1 22R R6 6 Resistor RGP0204 1 220K R4 5 7 9 10 12 1 Resistor RGP0204 1 2K7 R2 1 Resistor RGP0204 1 6K8 RI 1 Singleturn Pot 1K VR1 1 Electrolytic 100uF 10V C15 1 Electrolytic 0 47uF 50V C13 1 Tantalum 10uF 16V 499D C1 1 Polyester 10 220nF C14 1 Polyester 10 4n7 Cll 2 Ceramic Axial 1200pF 50 100V C2 5 Ceramic Axial 220pF 50 100V C9 1 Ceramic Axial 2200pF 50 100V File Q ethel serv qualsys servman FTVT120 doc Issue I March 96 Page 22 of 34 eu seward 2770 0271 1 2770 0681 1 2870 0103 1 2870 0104 2 2870 0681 1 3005 0838 1 3005 0841 1 3005 0842 1 3005 0876 1 4110 0085 1 4210 0182 1 4230 0256 3 4310 0071 1 5222 0002 1 File Q ethel serv qualsys servman FTVT120 doc Issue I March 96 Page 23 of 34 Fetatrack Vascutrack 120 Series Service Manual C16 Ceramic Axial 270pF 50 100V C3 Ceramic Axial 680pF 50 100V C8 Ceramic Radial 10nF 100V C4 Ceramic Radial 100nF 100V C7 12 Ceramic Radial 680pF
25. ys servman FTVT120 doc Issue I March 96 Page 16 of 34 eu seward Fetatrack Vascutrack 120 Series Service Manual 1101 0104 1 ResistorLR1 1 100K R10 1101 0105 3 Resistor LR1 1 IMO R22 23 25 1101 0121 1 Resistor LR1 1 120R R4 1101 0222 1 Resistor LR1 1 2K2 R13 1101 0223 1 Resistor LR1 1 22K R15 1101 0224 3 Resistor LR1 1 220K R11 12 14 1101 0273 1 Resistor LR1 1 27K R6 1101 0275 1 Resistor LR1 1 2M7 R24 1101 0333 1 Resistor LR1 1 33K R16 1101 0391 1 Resistor LR1 1 390R R21 1101 0560 1 Resistor LR1 1 56R R3 1101 0561 1 Resistor LR1 1 560R R9 1101 0683 2 Resistor LR1 1 68K R19 R7 1330 0103 2 Singleturn Pot 10K VR3 4 1810 0103 1 Volume Rotary Edge 10K LOG PC 908 VRI 2120 0108 1 Electrolytic 1000uf 10V Axial C3 2220 0107 7 Electrolytic 100uF 10V C1 2 7 9 12 13 23 2220 0476 1 Electrolytic 47uF 10V 509D C8 2260 0225 1 Electrolytic 2 2uF 50V 509D C19 2350 0105 Tantalum luF 35V 499D C15 2564 0228 1 Polyester 10 220nF Cll 2564 0478 2 Polyester 10 470nF C18 22 2770 0472 1 Ceramic Axial 4700pF 50 100V C10 2870 0103 2 Ceramic Radial 10nF 100V C14 20 2870 0104 4 Ceramic Radial 100nF 100V C4 5 6 24 2870 0473 1 Ceramic Radial 47nF C16 2960 0390 1 Polystyrene 390pF File Q ethel serv qualsys servman FTVT120 doc Issue 1 March 96 Page 17 of 34 eu seward 4120 4148 3 4140 0051 1 4140 0056 2 4160 0181 1 4210 0183 1 4250 0300 1 4310 0820 1 4310 1458 1 4310 2907 1 4312 755
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