Seward fetatrack and vascutrack 120 dopplers

Fetatrack / Vascutrack 120 Series Service Manual

FETATRACK & VASCUTRACK 120 SERIES SERVICE MANUAL

File - Q:ethel.serv\qualsys\servman\FTVT120.doc Issue 1 March 96

Page 1 of 34

Section 1. General Introduction


CONTENTS

Section 2. Description of the Instrument

Section 3. Circuit Description

Unit 7

3.2.4 Oscillator and Transmitter Amplifier 8

3.3.1 ON

Section 4. Test and Calibration

Unit 10

4.7 Transducer Oscillator and Transmitter

4.8 Transducer Receiver and Detector

Section 5. Fault Finding

11

12


Page 2 of 34


Section 6. Parts Lists

0120-0003

0120-8205

PD120 Audio Unit Assembly

PD120 Auto Off Audio Velocity PCB Assembly

0120-0004

0120-8201

0120-0002

0120-8202

Dedicated 2 MHz Assembly

PD120 Audio PCB Assembly

2 MHz Transducer Assembly

2 MHz Transducer PCB Assembly

0120-0007

0120-8204

0120-0038

0120-8207

5.4 MHz Transducer Assembly

5.4 MHz Transducer PCB Assembly

8 MHz Transducer Assembly

8 MHz Transducer PCB Assembly

Section 7. Drawings and Circuit Diagrams

0120-8202 2 MHZ Transducer Scematic

0120-8204

0120-8207

0120-8201

0120-8201

0120-8205

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

16

16

19

20

22

22

24

24

26

26

29

30

31

32

33

34


Page 3 of 34


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 operation 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 :-

Techbase

Newport

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.

Aquasonic gm


Page 4 of 34


1.2 SYMBOLS

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

As indicated in the operating 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.

1.3.1 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.


Page 5 of 34


SECTION 2

DESCRIPTION OF THE INSTRUMENT

BATTERY LOW - LED indicator to show when the battery has reached a point when it 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.

Note:- Before dismantling the unit, unplug the transducers and accessory cable (if present).

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 and press it out of the cradle.


Page 6 of 34


SECTION 3

CIRCUIT DESCRIPTION


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 TR1.

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 & R7 the LED1 turns on indicating that the battery requires changing.

The ultrasound transducer operates 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.

3.2.3 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.


Page 7 of 34


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.

3.2.4

OSCILlATOR AND TRANSMITTER AMPLIFIER

Field effect transistor TR1, with L1, C2, C3 and associated components form a Colpitts oscillator. This oscillator runs at a nominal frequency of 2, 5.4 or 8MHz 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 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 1khz.

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.

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 IC1, which feeds the loudspeaker.

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.

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


Page 8 of 34


3.3.1 UNIT ON / OFF

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.

The LED illuminates when the rail voltage from the battery falls too low for continued operation, indicating that the battery should be changed.


Page 9 of 34


SECTION 4

TEST AND CALIBRATION


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.

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 .

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.

4.2.1 EQUIPMENT

Oscilloscope 2 channel 50 MHz bandwidth minimum resolution 5mV/cm

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

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 pin1 must be greater than 5 volts.


Page 10 of 34


Increase voltage to give 7.2 V (+ 10mV) at C3 +ve and LED D3 must turn OFF. The voltage at IC2 pin1 must be less than 2.9V.

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.

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 pin1

(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 PL1 pin 1 the

DC voltage must not rise to greater than 5.6 Volts.

4.5 AUDIO

Connect 8 ohm 1 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.

With oscilloscope set to AC input adjust input signal from audio generator 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 VR1 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 & 8mhz depending on transducer) and of amplitude greater than 1.7V.


Page 11 of 34


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 adjust 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.


Page 12 of 34


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

Ultrasound does not function Transducer

Transmitter / Receiver

Unit On / Off circuit

Ultrasound OK but no audio Transducer position

Crackling operation of volume control VR1

Broken coductor in cable

Headphone socket SK2

Try another transducer

Transmitter drive TS1, TS2

3V pk/pk. See Ultrasound calibration tests

Gate of TR1 in audio circuit

Re position transducer

Replace volume control

Check audio signal on pin 3 of IC 1

Audio signal on PL1 pin 5

Loudspeaker

Unit does not switch ON Remote switch on transducer PL1 pin 3 goes low when switch depressed

TR2 V FET Gate goes low when switch depressed. Source goes to

0.2V of Drain


Page 13 of 34

Battery Low LED on permanantly

Excessive battery drain

Unit unstable

Battery


Battery condition

PL1 pin 7 > 7V

PL1 pin 7 > 7V

IC2 A Comparator

Turn Off circuit TR2

Ultrasound transducer

TR2

Battery condition

See test / calibration section

Gate of TR2 must be at same level as drain

Change battery

Replace transducer

Emitter - 5V

Collector > 7V

PL1 pin 7 > 7V


Page 14 of 34


SECTION 6

PARTS LISTS

0120-8205

0120-0002

0120-8202

0120-0007

0120-8204

0120-0038

0120-8207

AUTO OFF AUDIO VELOCITY PCB ASSEMBLY

DEDICATED ASSEMBLY

2 MHz TRANSDUCER ASSEMBLY

2 MHz TRANSDUCER PCB ASSEMBLY

5.4 MHz TRANSDUCER ASSEMBLY

5.4 MHz TRANSDUCER PCB ASSEMBLY

8 MHz TRANSDUCER ASSEMBLY

8 MHz TRANSDUCER PCB ASSEMBLY


Page 15 of 34


0120-0003 AUDIO UNIT 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

0120-3414 1 PD120 Body Moulding

0120-3415 1 PD120 Battery Slide

0120-3425 4 PD120 Speaker Clamps

0120-8203 1 PD120 Audio/Velocity PCB Assembly

5211-0008 1 Molex Housing 8 way

5250-0000 8 Molex Crimps

5504-0004 1 Lemo Socket 4 way EGGOB304CNL

5810-0000 1 Battery Connector PP3

6520-0225 1 Loudspeaker round 2.25inc

7000-0100 103 Wire 7/0.2 Single White

Lemo 103mm

7000-0200 115 Wire 7/0.2 Single Pink

Loudspeaker 115mm

7000-1000 195 Wire 7/0.2 Single Black

Loudspeaker 92mm - Lemo 103mm

7000-3000 103 Wire 7/0.2 Single Red

Lemo 103mm

7000-5000 103 Wire 7/0.2 Single Yellow

Lemo 103mm

7071-0010 28 Sleeving Helsin 1mm

4 Lengths of 7mm

7151-1306 2 Screw Stainless PAN M3x6mm

7151-4506 4 Screw Self Tap PAN N4x1/4in (type B)

7153-1306 3 Screw Stainless CSK M3x6mm

7400-0001 2 Tyrap short type PLT1M

7704-0002 1 Spirol Pin Stainless 302 1/16 x 13/16

7711-3001 5 Insert Brass Sonicloc M3 Short

7900-0002 0 Adhesive Evostick Clear

0120-8205 AUTO OFF AUDIO VELOCITY PCB ASSEMBLY (fitted to units with an interchangeable transducer only)


0120-3405 1 Audio PCB (un populated)

0120-3422 1 PD120 Volume Spacer

Spacer for VR1

1101-0010 1 Resistor LR1 1% 1R

R5

1101-0102 4 Resistor LR1 1% 1KO

R2,8,17,20

1101-0103 2 Resistor LR1 1% 10K

R1,18


Page 16 of 34


1101-0104 1 Resistor LR1 1% 100K

R10

1101-0105 3 Resistor LR1 1% 1MO

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)

VR1

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 1 Tantalum 1uF 35V 499D

C15

2564-0228 1 Polyester 10% 220nF

C11

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


C4,5,6,24

2870-0473 1 Ceramic Radial 47nF

C16

2960-0390 1 Polystyrene 390pF


Page 17 of 34


C17

4120-4148 3 Diode 1N4148

D3,5,6

4140-0051 1 Diode Zener BZX79 B5V1 2%

D2

4140-0056 2 Diode Zener BZX79 C5V6

D1,4

4160-0181 1 Varistor S1OV-S07K11

Fit across R 10

4210-0183 1 Transistor BC183C

TR1

4250-0300 1 FET V-Type VPO300M

TR2

4310-0820 1 Analogue IC - TBA820M

IC1

4310-1458 1 Analogue IC - MC1458 CP

IC2

4310-2907 1 Analogue IC - LM2907N8

IC3

4312-7555 1 Analogue Surface Mount IC - ICM7555 IBA

IC5

4322-4013 1 CMOS Surface Mount IC - MC14013BD

IC4

4410-0540 1 Led Single Yellow 2mm

LED1

5222-0008 1 Molex Wafer Right Angle 8 way

PL1

5404-2001 2 Jack Socket 3.5mm Stereo pc


Page 18 of 34


0120-0004

Part No.

2MHz DEDICATED ASSEMBLY

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 PD120 Retractile Cable

0120-8201 1 PD120-OB Audio Circuit Assembly

0120-8503 1 2MHz Cradle 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

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 PLT1M

7441-2660 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 1 Silastic Corning 3140 RTV

0.005gm

7900-0011 1 Double Sided Tape Pads


Page 19 of 34


0120 8201

Part No.

AUDIO PCB ASSEMBLY (fitted to FETATRACK variant only)

Qty Description

0120-3404 1 PD120 Audio PCB

0120-3422 1 PD120 Volume Spacer

Spacer for VR1

1101-0010 1 Resistor LR1 1% 1R

R5

1101-0102 2 Resistor LR1 1% 1KO

R2,8

1101-0103 1 Resistor LR1 1% 10K

R1

1101-0104 1 Resistor LR1 1% 100K

R10

1101-0121 1 Resistor LR1 1% 120R

R4

1101-0224 3 Resistor LR1 1% 220K

R11,12,14

1101-0273 1 Resistor LR1 1% 27K

R6

1101-0560 1 Resistor LR1 1% 56R

R3

1101-0561 1 Resistor LR1 1% 560R

R9

1101-0683 1 Resistor LR1 1% 68K

R7 and link VR2

1810-0103 1 Volume Rotary Edge 10K LOG (PC 908)

VR1

2120-0108 1 Electrolytic 1000uf 10V Axial

C3


C1,2,7,9,12,13

2220-0476 1 Electrolytic 47uF 10V 509D

C8

2564-0228 1 Polyester 10% 220nF

C11


C10


C14


C4,5,6

4120-4148 1 Diode 1N4148

D3

4140-0051 1 Diode Zener BZX79 B5V1 2%

4140-0056 1 Diode Zener BZX79 C5V6

D1

4160-0181 1 Varistor S1OV-S07K11


Page 20 of 34


Fit across R 10

4210-0183 1 Transistor BC183C

TR1

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


PL1

5404-2001 2 Jack Socket 3.5mm Stereo pc

JK1,2


Page 21 of 34


0120-0002

Part No.

2 Mhz TRANSDUCER

Qty Description

0120-1502 1 Probe Membrane Switch

0120-1520 1 30/Series Serial number Label



0120-8402 1 PD120 Retractile Cable Assembly






0120-8202

Part No.

2 MHz TRANSDUCER PCB ASSEMBLY

Qty Description

0120-3410 1 PD120 Probe RF PCB

1201-0100 1 Resistor RGP0204 1% 10R

R3

1201-0101 1 Resistor RGP0204 1% 100R

R8

1201-0102 1 Resistor RGP0204 1% 1K

R11

1201-0220 1 Resistor RGP0204 1% 22R

R6

1201-0224 6 Resistor RGP0204 1% 220K

R4,5,7,9,10,12

1201-0272 1 Resistor RGP0204 1% 2K7

R2

1201-0682 1 Resistor RGP0204 1% 6K8

R1


VR1


C15

2250-0474 1 Electrolytic 0.47uF 50V

C13

2330-0106 1 Tantalum 10uF 16V 499D

C1

2564-0228 1 Polyester 10% 220nF

C14

2564-4710 1 Polyester 10% 4n7

C11


C2,5


C9



Page 22 of 34


C16


C3


C8


C4


C7,12

2870-0681 1 Ceramic Radial 680pF 100V

C10

3005-0838 1 Inductor 5S 0838 Toko

L3

3005-0841 1 Inductor 5S 0841 Toko

L1

3005-0842 1 Inductor 5S 0842 Toko

L4

3005-0876 1 Inductor 5S 0876 Toko

L2

4110-0085 1 Diode BAT85

D1

4210-0182 1 Transistor BC182

TR2

4230-0256 3 FET M-Type BF256A

TR1,3,4

4310-0071 1 Analogue IC - TL071CP

IC1


PL1


Page 23 of 34


0120-0007

Part No.

5.4 MHz TRANSDUCER

Qty Description

0120-1505 1 PD120 Vascular Probe Switch 5.4 MHz

0120-1521 1 31/Series Serial Number Label




0120-8504 1 5.4MHz Cradle assy




7900-0007 1 Silastic Corning 3140 RTV


0120-8204

5.4 MHZ TRANSDUCER PCB ASSEMBLY



1201-0100 1 Resistor RGP0204 1% 10R

R3

1201-0101 1 Resistor RGP0204 1% 100R

R8

1201-0102 1 Resistor RGP0204 1% 1K

R11

1201-0220 1 Resistor RGP0204 1% 22R

R6

1201-0224 6 Resistor RGP0204 1% 220K

R4,5,7,9,10,12

1201-0272 1 Resistor RGP0204 1% 2K7

R2

1201-0682 1 Resistor RGP0204 1% 6K8

R1


VR1


C15


C13

2330-0106 1 Tantalum 10uF 16V 499D

C1

2564-0228 1 Polyester 10% 220nF

C14

2564-4710 1 Polyester 10% 4n7

C11

2770-0101 1 Ceramic Axial 100pf 50/100

C8



Page 24 of 34


C16

2770-0181 1 Ceramic Axial 180pF/100V

C5

2770-0330 1 Ceramic Axial 33pF 50/100

C9


C3


C4


C7,12


C10

2870-0820 1 Ceramic Radial 82pF 50/100V

C2

3005-0838 1 Inductor 5S 0838 Toko

L3

3005-0841 1 Inductor 5S 0841 Toko

L1

3005-0842 1 Inductor 5S 0842 Toko

L4

3005-0876 1 Inductor 5S 0876 Toko

L2

4110-0085 1 Diode BAT85

D1


TR2

4230-0256 3 FET M-Type BF256A

TR1,3,4


IC1



Page 25 of 34


0120-0038

Part No.

8 MHz TRANSDUCER

Qty Description

0120-1522 1 32/Series Serial Number Label

0120-1524 1 PD120 Vascular Probe Switch 8 MHz









0120-8207

Part No.

8 MHz TRANSDUCER PCB ASSEMBLY

Qty Description


1201-0100 1 Resistor RGP0204 1% 10R

R3

1201-0101 1 Resistor RGP0204 1% 100R

R8

1201-0102 1 Resistor RGP0204 1% 1K

R11

1201-0220 1 Resistor RGP0204 1% 22R

R6

1201-0224 6 Resistor RGP0204 1% 220K

R4,5,7,9,10,12

1201-0272 1 Resistor RGP0204 1% 2K7

R2

1201-0682 1 Resistor RGP0204 1% 6K8

R1


VR1


C15


C13

2330-0106 1 Tantalum 10uF 16V 499D

C1

2564-0228 1 Polyester 10% 220nF

C14

2564-4710 1 Polyester 10% 4n7

C11


C16


C9



Page 26 of 34


C2

2770-0330 1 Ceramic Axial 33pF 50/100

C8


C3


C4


C7,12


C10

2870-0820 1 Ceramic Radial 82pF 50/100V

C5

3005-0838 1 Inductor 5S 0838 Toko

L3

3005-0842 2 Inductor 5S 0842 Toko

L1,L4. Link pins 1 and 2 on L1

3005-0876 1 Inductor 5S 0876 Toko

L2

4110-0085 1 Diode BAT85

D1


TR2

4230-0256 3 FET M-Type BF256A

TR1,3,4


IC1


PL1


Page 27 of 34


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


Page 28 of 34

Seward fetatrack and vascutrack 120 dopplers

FETATRACK & VASCUTRACK 120 SERIES SERVICE MANUAL

Related manuals

Solinst

105

Acer

Aspire 4710G

Ultrasound Technologies

Fetatrack 120 series