Ultratec PD1 SERIES
Pocket Doppler
SERVICE MANUAL
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 2
CONTENTS1. General Introduction
1.1. Introduction1.2. Re Order Information1.3. Symbols1.4. CE Marking1.5. Guidelines for identifying and resolving adverse EMC conditions
2. Description of the Instrument2.1. Audio Unit. PD12.2. Audio Unit PD1+2.3. Dismantling Instructions2.4. Audio Unit2.5. Transducers
3. Circuit Description3.1. Introduction3.2. Audio Unit Power Supply3.3. Battery Low Indicator3.4. Ultrasound Transducer3.5. Oscillator and Detector3.6. Receiver and Detector3.7. Audio Amplifier3.8. Velocity Processor
4. Test and Calibration4.1. Introduction4.2. Performance Checks4.3. Test Procedure4.4. Audio Unit4.5. Transducer4.6. Velocity Processor4.7. Transducer Calibration
5. Fault Finding5.1. Fault Finding Guidelines
6. Parts Lists6.1. PD1+ Audio Unit PCB Assembly6.2. PD1 Audio Unit PCB Assembly6.3. PD1 2MHz Transducer assembly6.4. PD1 General Assembly6.5. PD1+ General Assembly
7. Drawings and Circuit Diagrams7.1. PD1 Audio PCB Layout7.2. PD1+ Audio PCB Layout7.3. PD1 2MHz Transducer Assembly7.4. PD1 Audio PCB Circuit Diagram7.5. PD1+ Audio PCB Circuit Diagram
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 3
1. General Introduction
1.1. Introduction
This service manual is written to support the maintenance and repair of the PD1 SeriesDoppler detectors.
Servicing of this equipment should be performed by a qualified technician, after carefullystudying 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 operationof 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.,
Foresters House,
Itton, Chepstow,
Gwent
Telephone: +44 (0) 1291 641301
FAX: +44 (0) 1291 641302
E-mail: [email protected]
Retain the packing material for possible future use.
Important Note:
In the unlikely event that the instrument must be returned to Ultrasound Technologies forservice or for any other reason, use the same packing material in which the instrument wasdelivered.
If this is not available, the instrument should be packed in such a way that will provideadequate packing. The Company will not accept any responsibility for loss or damage due toimproper use of packing material.
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 4
1.1 Re - Order InformationListed below are the consumables used with the PD1 Series Pocket Dopplers: -
Description
Aquasonic Gel 60 gm.
MN1604 Alkaline Battery
1.2 Symbols
The following symbols have been used on the PD1 and are here defined according to IEC601and B.S.5724.
IEC Symbol 878-02-02
Type B Equipment.
IEC Symbol 348
Attention Consult accompanying documents
Headset Output
Volume Control
Serial DATA Out
Rear View of PD1 / PD1+Showing additional
symbols
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 5
1.3 CE Mark
This product complies with the essential requirements of the European Council Directive93/42/EEC relating to Medical Devices.
1.4 Guidelines for identifying and resolving adverse EMC conditions
This product is classified as a Class A Group 1 type of product according to EN55011. Thisproduct is allowed in domestic establishments under the jurisdiction of a Healthcareprofessional.
Emissions
Care has been taken through the design and manufacturing process to minimise the EMemissions, which may be produced by this equipment. However, in the unlikely event that theunit causes an EM disturbance to adjacent equipment, we suggest that the procedure iscarried out ‘out of range’ of the affected equipment.
Immunity
If the user has any doubt regarding the units EM immunity during routine operation, wesuggest that the source of EM disturbance is identified and it’s emissions reduced.
If the user has any doubt regarding the identification and resolution of adverse EM conditions,they should contact Ultrasound Technologies Ltd. directly who will advise on the situation. Theaddress can be found in the front of this manual.
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 6
2. Description of the Instrument
2.1. Audio Unit PD1
The following functions are found on the PD1 Pocket Doppler (refer to page 3 of your operatinginstructions): -
UNIT ON/OFF On / Off control.
BATTERY LOW LED indicator to show when the battery has reached a point when itrequires changing.
VOLUME CONTROL Rotary edge potentiometer, which increases or decreases the settingof the volume.
HEADSET Audio output for connection to a stereo headset for private listening.
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 7
2.2. Audio Unit PD1+The following functions are found on the PD1+ Pocket Dopplers (refer to page 3 of youroperating instructions):-
UNIT ON/OFF On / Off control.
VOLUME CONTROL Rotary edge potentiometer, which increases or decreases the settingof the volume.
HEADSET Audio output for connection to a stereo headset for private listening.
RS 232 Interface Serial data output, for connection to the optional ULTRATRACE 2 PCsoftware. Connections are made via the 3.5mm Stereo jack socket.
FHR DISPLAY Custom LCD module displays FHR rate, FH pulse and Batterycondition.
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 8
2.3. Dismantling InstructionsSpecial Note: -The instrument must not be dismantled when in use on a patient, ensure allaccessories are disconnected.2.4. Audio UnitThe Audio unit houses the main circuit board. To remove the circuit board, turn the unit ontoit's front and remove the three M4 countersunk screws. The rear panel will now come awayrevealing the PCB.
Remove the two M3 screws securing the PCB.
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 9
The transducers, loudspeaker and battery connections are ‘hard wired’ to the PCB. De-solderthe connections at J4 (retractile cable) and J3 (loudspeaker), the PCB can then be pulled clearof the case.
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 10
1.5 TransducersThe transducers are a ‘sealed unit’. However, it is possible to gain access to the 2 MHzassembly by removing the two blanking grommets and M3 countersink screws. Removing thescrews will allow the assembly to be split along its length. Gently prise the assembly apart.
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 crystalwires and retractile cable connections (see diagram below).
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 11
2.0 Circuit Description
2.1 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
• Unit ON / OFF
• Battery Low
2.2 Audio Unit Power Supply
The unit operates from a single 9-Volt dry battery. It is recommended that only alkaline cells beused. The audio circuit is fed directly from the battery. D1 provides circuit protection frombattery 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 Q2allowing current to flow into the various circuits.
The unit will remain switched on for approximately 5 minutes (set by C4 and R5) after which itturns off automatically, unless the user forces the unit off by de-pressing the ON/OFF switch.2.3 Battery Low IndicatorU3 is a voltage detector, when the voltage on pin 1 drops below the threshold set by R10 andR11 (7.3V), the output state changes forcing the LED (D2) to illuminate.2.4 Ultrasound TransducerThe ultrasound transducer operates on the continuous wave Doppler principle. There are anumber of transducer frequencies suitable for different applications, however the basicoperating principles are identical.
Each transducer consists of a pair of piezo ceramic crystals, each crystal pair is arranged as atransmitter and receiver, the ultrasonic output beam is focussed through a lens or faceplate.
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 12
With the exception of the 2MHz Fetal transducer, the electronics are housed in the main audiounit.
The oscillator and detector are built up of four discrete sections. These are the masteroscillator, transmitter amplifier, receiver amplifier and detector.
These operate to produce a continuous wave ultrasound signal that is passed to thetransmitting crystal in the transducer.
The signal is then reflected from moving interfaces within the body to the receiver crystal in thetransducer, amplified and then detected so the audio Doppler shift of that moving interface canbe heard audibly and / or converted into a velocity signal.2.5 Oscillator and Transmitter AmplifierField effect transistor Q2, with L1, C16, C17 and associated components form a Colpittsoscillator. This oscillator runs at a nominal frequency of 2, 5 or 8MHz producing a sinewave ofamplitude of approximately 5V Pk.
The signal is then fed to output transistor Q3 that drives the transmitter crystal in thetransducer. The output power is set by VR1. The signal is fed to the transducer via a tunedtransformer L2 (C23), the output impedance of which is set correctly to match the transducercrystal impedance. The output drive signal is nominally 1.5V Pk.2.6 Receiver and DetectorThe reflected Doppler signal is fed via a resonant transformer L4 (C25) to the gate of Q5, thedrain of this FET connects to the source of Q4 to form a cascode amplifier the drain of whichcontains the resonant circuit L3,(C21).
From the drain of Q4 the amplitude complex of the received signal is detected by passing thesignal 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 associatedcomponents form a band pass filter amplifier with a bandwidth of 150Hz to 1KHz for theobstetrics or 300Hz to 4KHz in the vascular transducer.
This signal is passed to the audio unit via the retractile cable.2.7 Audio AmplifierThe audio signal is routed via the retractile cable to J4 pin 4 on the audio circuit board. Thesignal passes through the potentiometer VR1 to the audio amplifier U2, where it is amplifiedand output to the loudspeaker connected to J3.2.8 Velocity Processor (PD1V Model Only)The audio signal is fed from the band pass amplifier (U5) through the threshold control VR3 tothe 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 ECGmachines and recorders.
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 13
3.0 Test and Calibration
3.1 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 out to thepower supply circuits then it is recommended that the whole test / calibration procedure isundertaken.3.2 Performance ChecksThe following procedure is intended to provide a means of determining the functional status ofthe unit. It should be included as part of a preventative maintenance plan and should beperformed 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 flashON momentarily and then extinguish.
Place the transducer with ultrasound gel on the palm of the hand over the radial artery, a clearpulse will be heard.
Check the unit for signs of damage, particularly the transducer cable near the point of entry tothe unit and transducer body.3.3 EquipmentOscilloscope 2 channel 50 MHz bandwidth minimum resolution 5mV/cm
DC Power Supply 0 – 30VDC @1A
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
3.4 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 J1.Check the battery low LED flashes momentarily.Check the current being drawn by the board under test is less than 50ma.
Using the DVM, measure the DC voltage at the Drain of Q2 (junction of C8 & C11) this will bebetween 8.80 and 8.60 V DC.
Carefully decrease the power supply output, check and record the voltage reading at whichpoint the Battery low LED illuminates permanently. This will be between 7.0 and 7.5 V DC
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 14
Using a pair of tweezers, Introduce noise into pin 4 of J4. Rotate the volume control through itscomplete range of travel and observe the audio output from the speaker increases anddecreases accordingly.
3.5 Transducer
Transmitter
Set the DC Power Supply to 9Vdc, solder the +ve lead to pin 1 of J1 and the –ve lead to J1 pin2 on the board under test.
Switch ON the power supply, check the current being drawn by the board under test is lessthan 50ma.Using the DVM, measure the DC voltage at the junction of C8 and R7, this will be between 5.2and 5.8V DC.Using the oscilloscope connected to the pad TxSig, adjust L1 so that the signal is set to2.000MHz.
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 theDC signal.
Move the oscilloscope to J1 pin 4, carefully stroke the transducer faceplate and observe a lowfrequency signal is displayed on the oscilloscope. The measured output will be a DC voltageof greater than 5.5V.
3.6 Velocity Processor
With the oscilloscope set to AC input, adjust the output signal from audio generator to afrequency of 1kHz and an amplitude of 15mV + 1mV pk-pk. Connect this signal to the junctionof C22 and U5 pin 1.
Set frequency to 10KHz and attach oscilloscope to pin 7 IC3, adjust VR3 until the signal justchanges state from 0V 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 untilthe until the DC level measures 5V.
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 15
4.0 Fault finding guidelinesThis section is an aid to trouble shooting and should be used in conjunction with the relevantcircuit diagrams found at the rear of this manual. In each case the re calibration must becarried 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 connectedto a patient.
Symptom Suspect Circuit CheckUnit does not switch ON Remote switch on front panel J1 pin 1 goes low when
switch is depressed
U1 ON/OFF Control Output goes low when switchis depressed
Battery J1 pin 1 > 7VBattery Low LED onpermanently
Battery condition J1 pin 1 > 7VReplace battery
U3 Comparator See test / calibration sectionExcessive battery drain U1 / Q2 ON/OFF Control Q2 must switch when switch
is depressed.
Change batteryUltrasound OK but no audio Transducer position Re position transducer
Crackling operation of volumecontrol VR1
Replace volume control
Broken conductor in cable Check audio signal on pin 3of U2
Headphone socket SK2 Audio signal on J3 pin 1Replace loudspeaker
Unit unstable Ultrasound transducer Check output drive intocrystal is 1.5V pk/pk.Check received signal intransducer J1 pin 4, signalshould be a low frequencyaudio signal approx. 2Vpk/pk.
Replace transducer.
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 16
5.0 Parts listThe following section contains parts lists for the following items: -
• PD1+ Audio PCB assembly
• PD1 Audio PCB assembly
• PD1 2MHz Probe assembly
• PD1 Final assembly
• PD1+ Final assembly
5.1 PD1+ Audio PCB Assembly
Device Value Device Type Circuit Reference Quantity
Capacitor 470uF Electrolytic Axial 10V Panasonic SUECEB1AU471
C10 1
Capacitor 100uF Min Electrolytic 16V5mm
Nippon Chemi-con SRA /Samsung SSM
C2,9,11,12,13,18,19,21,27,28,29,30,32,33,34,35,37
17
Capacitor 10uF tant 20V case size A AVX / Kemet case size A C5,15,16 3
Capacitor 0u47F tant 25V case size A AVX / Kemet case size A C7 1
Capacitor 0805 100nF Mono Ceramic 0805 series Z5U dielectric C1,6,8,14,17 5
Capacitor 0805 47nF Mono Ceramic 0805 series X7R dielectric C26 1
Capacitor 0805 10nF Mono Ceramic 0805 series X7R dielectric C4,36 2
Capacitor 0805 1nF Mono Ceramic 0805 series COG dielectric C20,31 2
Capacitor 0805 22pF Mono Ceramic 0805 series COG dielectric C23,24 2
Capacitor 1206 1uF Z5U Ceramic 1206 series Z5U dielectric C3,22,25 3
IC Analogue CD4013D Philips/ Harris/National U2 1
IC Analogue ZM33064Z Zetex U4 1
IC Analogue LM386M-1 National U3 1
IC Analogue LM324M National U7 1
IC PSU ICL7660CBA Maxim U1 1
IC PSU ZR78L05G Zetex U11 1
IC Digital CD74HC4066D Philips/ Harris/National U9 1
IC Digital MAX1243BESA Maxim U6 1
IC Digital MAX202ECSA Maxim U10 1
IC Digital TSC87251G1-A16CB Temec U8 1
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 17
IC Digital ICM7211AMIM44 Harris U5 1
Diode 10BQ040 IR D1 1
Diode BAS16 D2,5 2
Crystal 12MHz 86SMX X1 1
Transistor RFD8P05SM Harris Q1 1
Resistors 1% 0805 10R Samsung/Phillips/ROHM R5,6 2
Resistors 1% 0805 100R Samsung/Phillips/ROHM R3 1
Resistors 1% 0805 2K2 Samsung/Phillips/ROHM R7 1
Resistors 1% 0805 4K7 Samsung/Phillips/ROHM R8 1
Resistors 1% 0805 10K Samsung/Phillips/ROHM R9,13,15,16,18,19,20,21,22,23,24,25,26,28,29
15
Resistors 1% 0805 22K Samsung/Phillips/ROHM R17 1
Resistors 1% 0805 47K Samsung/Phillips/ROHM R12 1
Resistors 1% 0805 68K Samsung/Phillips/ROHM R11,14 2
Resistors 1% 0805 100K Samsung/Phillips/ROHM R10,27,31 3
Resistors 1% 0805 330K Samsung/Phillips/ROHM R30 1
Resistors 1% 0805 1M Samsung/Phillips/ROHM R1,2,4 3
LCD module PD1D107 1
Volume Control 10K Log Tsubuya 161P-N2, A10K VR1 1
Volume Control Knob Tsubuya 1KF-4B BlackKnob
VR1 knob 1
Connector Jack socket Hosiden HSJ 1501-010010 P1,2 2
Connector PP3 battery connector 1
Connector Molex 3 way ZIF Molex 39-51-4032 J2 1
PCB PD1 plus audio board PD1D109 1
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 18
5.2 PD1 Audio PCB Assembly
Device Value Device Type Circuit Reference Quantity
Capacitor 470uF Electrolytic Axial10V
Panasonic SUECEB1AU471
C7 1
Capacitor 100uF Min Electrolytic 16V5mm
Nippon Chemi-con SRA /Samsung SSM
C1,8,9,11,12 5
Capacitor 10uF tant 20V AVX / Kemet case size A C13,14 2
Capacitor 0u47F tant 25V AVX / Kemet case size A C4,5 2
Capacitor 1206 100nF Mono Ceramic 1206 series Z5U dielectric C6,8,9,10,15 5
Capacitor 1206 10nF Mono Ceramic 1206 series X7R dielectric C3 1
Capacitor 1206 1uF Z5U Ceramic 1206 series Z5U dielectric C2 1
IC Analogue CD4013D Philips/ Harris/National U1 1
IC Analogue ZM33064Z Zetex U3 1
IC Analogue LM386M-1 National U2 1
Diodes 10BQ040 IR D1 1
Diode LED Yellow Temic TLLY4401 D2 1
Transistor RFD8P05SM Harris Q2 1
Transistor BSS138 Fairchild Semiconductor Q1 1
Resistors 1% 1206 10R Samsung/Phillips/ROHM R8,9 2
Resistors 1% 1206 1K Samsung/Phillips/ROHM R2 1
Resistors 1% 1206 2K2 Samsung/Phillips/ROHM R10 1
Resistors 1% 1206 4K7 Samsung/Phillips/ROHM R11,12 2
Resistors 1% 1206 100K Samsung/Phillips/ROHM R4 1
Resistors 1% 1206 1M Samsung/Phillips/ROHM R3,5,6,7 4
Resistors 1% 1206 3M3 Samsung/Phillips/ROHM R1 1
Volume Control 10K Log Tsubaya 161P-N2, A10K VR1 1
Volume Control Knob Tsubuya 1KF-4B BlackKnob
VR1 knob 1
Connector Jack socket Hosiden HSJ 1501-010010 P1,2 2
Connector PP3 battery connector 1
Connector Molex 3 way ZIF Molex 39-51-3032 J2 1
PCB PD1D103 PD1 Audio PCB 1
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 19
5.3 PD1 2MHz Transducer Assembly
Description Value Device Type Circuit Reference Quantity
Capacitor 100uF Min Electrolytic 16V5mm
Nippon Chemi-con SRA /Samsung SSM
C5,8,12 3
Capacitor 1u0F tant 35V case size A C4,11 2
Capacitor 100nF Mono Ceramic 0805 series Z5U dielectric C1,2,3,7,10,26,22,24 8
Capacitor 10nF Mono Ceramic 0805 series X7R dielectric C18 1
Capacitor 22nF Mono Ceramic 0805 series X7R dielectric C6,13 2
Capacitor 1n0F COG Ceramic 0805 series COG dielectric C9,15,23 3
Capacitor 220pF COG Ceramic 0805 series COG dielectric C19,20,25 3
Capacitor 330pF COG Ceramic 0805 series COG dielectric C17 1
Capacitor 470pF COG Ceramic 0805 series COG dielectric C21 1
Capacitor 680pF COG Ceramic 0805 series COG dielectric C16 1
IC Analogue TL072CD SGS / TI U1 1
Diodes BZX84C6V2 D1 1
Diodes BAT54 D2 1
Transistor MMBF4416LT1 Motorola Q2,4,5 3
Transistor BC848B Q1,3 2
Inductor Toco 0838 L4 1
Inductor Toco 0842 L3 1
Inductor Toco 0841 L1 1
Inductor Toco 0876 L2 1
Resistors 1% 0805 10R Samsung/Phillips/ROHM R17,16 2
Resistors 1% 0805 22R Samsung/Phillips/ROHM R7 1
Resistors 1% 0805 100R Samsung/Phillips/ROHM VR1 1
Resistors 1% 0805 1K Samsung/Phillips/ROHM R3,8 2
Resistors 1% 0805 1K5 Samsung/Phillips/ROHM R15 1
Resistors 1% 0805 2K2 Samsung/Phillips/ROHM R1,2,11 3
Resistors 1% 0805 27K Samsung/Phillips/ROHM R14 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
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 20
Faceplate PD1D102 1
Probe Cover PD1D101 2
M3 x16 Pozi C'sk screw 1
M3 Full nut 1
Cover plug 2
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 21
5.4 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
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 22
5.5 PD1+ General Assembly
Description Part Number Quantity
Case Front PD1D105 1
Case Rear PD1D106 1
Battery Slide PD1D104 1
Loudspeaker 1
Retractile cable PD1D100 1
Label front PD1+ PD1D108 1
Label rear PD1D108 1
Front Membrane PD1+ PD1D108 1
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
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 23
6.0 Circuit Diagrams & Engineering DrawingsThe following section contains the following circuit diagrams and Engineering Drawings: -
• PD1 Audio PCB Layout
• PD1+ Audio PCB Layout
• PD1 2MHz Probe assembly
• PD1 Audio PCB assembly
• 2MHz Transducer PCB assembly
• PD1+ Audio PCB assembly
• PD1 GA
• PD1+ GA
• 2MHz Transducer GA
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 24
PD1 Audio PCB Layout
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 25
PD1+ Audio PCB Layout
PD1 Probe PCB Layout
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. UK
Itton
, Che
psto
wFo
rest
ers
Hou
seD
ate:
ofSh
eet
Nam
e:FE
TALT
DR
6/11
/00
11
1:58
:30
PM
L3 0842
1 3
L4 0838
1 3
4 6
BAT54D2
23
J1
1 2 3 4
TL07
2
U1
3I+
2I-
8 4
1
TL07
2
U1
5I+
6I-
8 4
7
C21
470p
F
+C
40u
47F
+R
80u
47F
R16
10RR17
10R
R12K2
R2
2K2
R11
2K2
R15
1K5
R3
1K0
R1K0
R13100R
R10
100K
R18
100K
R4
100K
R12
100K
R9
100K
R5
100K
R6100K
R19
100K
L1 0841
1 2 3
BC84
8BQ
1
2B
3C
1E
BC848BQ3
2B
3C
1E
L2 0876
1 2 3
4 6
+C
1210
0uF
+C
510
0uF
+C
810
0uF
R722R
C1
100n
F
C22
100n
F
C2100nF
C26
100n
F
C24
100n
F
C10
100n
F
C3
100n
F
C7
100n
F
R14
27K
C19
220p
F
C25
220p
F
C20
220p
F
C15 1nF
C91nF
C23
1nF
C1310nF
C610nF
C1810nF
Vrf
TxSi
g
Vrf
RxS
ig
18/0
5/00
181
418
/01/
9915
83
(VR
1)
15/0
5/98
21M
arch
98
nas
- utl
Pock
et D
oppl
er F
etal
Tra
nsdu
cer 2
MH
z
Tran
sduc
er C
onne
ctor
12
34
56
78
12
34
56
78
A B C D
A B C D
R547R
J21 2 3
SK1
132 4
+C
71u
0F
ZM33
064Z
U4
1IN
3O
UT
ultra
tec
1999
Cop
yrig
htD
rg N
o:
Dat
eEC
NIs
sue
Dra
wn:
Ultr
asou
nd T
echn
olog
ies
Ltd
Gw
ent.
NP6
6BZ
. UK
Itton
, Che
psto
wFo
rest
ers
Hou
seD
ate:
ofSh
eet
Nam
e:PD
1PLU
S6/
11/0
01
26:
54:1
0 PM
R32 22K
R3
100R
U1
SI76
61
2C
AP+
4C
AP-
3G
ND
8V1
+5
VO-
C10
470u
F
VR1
100K
J31 2
J11 2
LM38
6M
U3
7
18
2M
3P6 4
5
+C
510
uF
+C
1510
uF
+C
1610
uF
R6
10R
Q1
RFD
8P05
SM
2D
1 G
3S
U2
CD
4013
11C
LK9
D10
RES
ET
8SE
T
12Q
13Q
U2
CD
4013
3C
LK5
D4
RES
ET
6SE
T
2Q
1Q
R7
2K2
+C
210
0uF
+C12100uF+
C11
100u
F
+C
910
0uF
R4
1M
R2
1M
R1
1M
R8
4K7
C13
10nF
C4
10nF
D1
10BQ
040
21
C3
1uF
J4
1 2 3 4
C6
100n
FC
110
0nF
C14
100n
F
C17
100n
F
C8
100n
F
Batte
ryC
ondi
tion
{02}
Uni
tShu
tDow
n {0
2}Au
dioC
ompl
ex {0
2}
182
Jun
004
Loud
spea
ker
Nov
99
317
817
6Se
pt 9
92
June
98
1
PD1
Plus
Aud
io C
ircui
t
Volu
me
Con
trol
Con
nect
orPo
wer
Tran
sduc
er
Uni
t On
/ Off
cont
rol
Batte
ry In
put
12
34
56
78
12
34
56
78
A B C D
A B C D
J6
132 4
74H
C40
66
U9
13C
ON
TA
5C
ON
TB
6C
ON
TC
12C
ON
TD
1XA
4XB
8XC
11XD
2YA
3YB
9YC
10YD
ultra
tec
1999
Cop
yrig
htD
rg N
o:
Dat
eEC
NIs
sue
Dra
wn:
Ultr
asou
nd T
echn
olog
ies
Ltd
Gw
ent.
NP6
6BZ
. UK
Itton
, Che
psto
wFo
rest
ers
Hou
seD
ate:
ofSh
eet
Nam
e:PD
1PLU
S6/
11/0
02
26:
54:1
0 PM
MAX
202E
U10
8R
2in
9R
2out
10T2
in7
T2ou
t
2V+
6V-
1C
1+
3C
1-
4C
2+
5C
2-
13R
1in
12R
1out
11T1
in14
T1ou
t
ZR78
L05G
U11
3IN
1O
UT
J5
1 10 11 12 13141516171819
2
20212223242526
3 4 5 6 7 8 9
ICM
7211
AM
U5
17639 2835
a1
1a2
9a3
16a4
29AD
1
30AD
2
36b1
2b2
10b3
18b4
44BP
37c1
3c2
11c3
19c4
31C
S1
32C
S2
38d1
4d2
12d3
20d4
24D
B0
25D
B1
26D
B2
27D
B3
41e1
5e2
13e3
21e4
43f1
8f2
15f3
23f4
42g1
7g2
14g3
22g4
34O
SC
40Vd
d
33Vs
s
MAX
1243
U6
3SH
DN
2AI
N6
DO
UT
5G
ND
4R
EF
1VD
D7
CS
8SC
LKR1722K
R1247K
R11 68K
R1468K
C2647nFR23
330K
R30330K
LM32
4M
U7
3I+
2I-
4 11
1
LM32
4M
U7
5I+
6I-
4 11
7
LM32
4M
U7
10I+
9I-
4 11
8
LM32
4M
U7
12I+
13I-
4 11
14
C20 1nF
C311nF
C24
22pF
C23
22pF
X1 12M
Hz
R10
100K
R27100K
R31100K
BAS1
6D
5
2 3
BAS1
6D
2
23
R2010K
R1810K
R9
10K
R29
10K
R28
10K
R26
10K
R25
10K
R24
10K
R22
10K
R21
10K
R19
10K
R15
10K
R13
10K
R16
10K
AT89
C51
U8
10R
ESET
21X1
20X2
35EA
VP43
P00
42P0
141
P02
40P0
339
P04
38P0
537
P06
36P0
7
2P1
03
P11
4P1
25
P13
6P1
47
P15
8P1
69
P17
24P2
025
P21
26P2
227
P23
28P2
429
P25
30P2
631
P27
11R
XD
16T0
17T1
13TX
D
14IN
T015
INT1
19R
D18
WR
33AL
EP
32PS
EN
+C
3210
uF
C36
10nF
C25
1uF
C22
1uF
C38100nF
C21100nF
C19
100n
F
C18
100n
F
C29
100n
FC
3010
0nF
C35
100n
FC
3710
0nF
C27
100n
F
C28
100n
F
C34
100n
F
C33
100n
F
Vcc
Vcc
Vcc
Dis
p1[1
:7]
Vcc
Dis
p2[1
:7]
Vcc
Dis
play
AD1
Dis
play
AD2
Dis
p2[1
]
Dis
play
CS
Dis
p2[2
]D
isp1
[7]
4fbp
Dis
p2[3
]D
isp1
[6]
Dis
p1[2
]D
isp1
[3]
Dis
p2[4
]D
isp1
[5]
Dis
p1[1
]D
isp1
[4]
Vcc
Vcc
Dis
p2[5
]D
isp1
[7]
Dis
p1[5
]
Dis
p1[6
]D
isp2
[3]
Dis
p2[6
]D
isp1
[4]
Dis
p2[2
]D
isp2
[4]
Dis
p2[7
]D
isp1
[3]
Dis
p2[1
]D
isp2
[5]
DB[
0]D
isp3
[1]
Dis
p1[2
]Vc
cD
isp2
[7]
Dis
p2[6
]D
B[1]
Dis
p3[2
]D
isp1
[1]
Dis
p3[2
]D
isp3
[3]
DB[
2]D
isp3
[3]
Dis
p3[1
]D
isp3
[4]
DB[
3]D
isp3
[4]
Dis
p3[7
]D
isp3
[5]
Agc1
Dis
p3[5
]4g
Dis
p3[6
]Ag
c2D
isp3
[6]
Dis
play
CS
Vcc
Agc3
Dis
p3[7
]D
ispl
ayAD
2Ag
c4D
ispl
ayAD
1R
S232
_Rx
RS2
32_T
xBa
ttery
Con
ditio
n {0
1}D
isp3
[1:7
]D
B[3]
A/D
Clo
ckD
B[2]
A/D
Dat
eIn
DB[
1]
A/D
CS
DB[
0]
A/D
Off
4g4f
Uni
tShu
tDow
n {0
1}
DB[
0:3]
Vcc
A/D
Clo
ck
A/D
CS
A/D
Off
A/D
Dat
eIn
Audi
oCom
plex
{01}
Agc1
Agc2
Agc3
Agc4
182
June
00
4
RS2
32
Nov
99
178
317
6Se
pt 9
92
Adc
Feta
l Com
plex
Low
Pass
Filt
er (5
Hz)
FHR
Agc
Band
Pas
s fil
ter f
o =
220H
z
Prec
isio
n R
ectif
ier
Not
e: P
ower
Rai
l +5
- 0V
June
98
1
PD1
Plus
Dig
ital S
igna
l Pro
cess
or
LCD
Inte
rface
12 M
Hz
Clo
ck
12
34
56
78
12
34
56
78
A B C D
A B C D
C232n2F
+C
3247
0nF
+C
2547
0nF
R3810K
R39
10K
SK
132 4
SK2
132 4
J5
1 2 3 4 5VR
110
K
R1
3M3
L3 0850
1 3
C46
33pF
C38
47pF
C42
100p
F
C37
100p
F
R622K
R4
22K
C40
22pF
VR2
20K
VR3
20K
+C
610
0uF
R11
470R
R18
68K
R968K
C20
68nF
C5
68nF
LM29
07
U3
2C
harg
e3
Ib4
Is
1Tc
o
6Vc
c5
Vcco
8gn
d7
op
MMBF4416Q4
1D
3G
2S
MMBF4416Q7
1D
3G
2SMMBF4416
Q6
1D
3G
2S
D2
BZX8
4C6V
2
23
D4
BZX8
4C6V
2
23
L4 0838
1 3
4 6
BAT54D5
23
TL07
2
U5
5I+
6I-
8 4
7
TL07
2
U5
3I+
2I-
8 4
1
C30470pF
C36
470p
F
R33
1K5
R31100R
R28
100K
R36
100K
R22
100K
R30
100K
R27
100K
R23
100K
R24100K
R37
100K
L1 0841
1 2 3
BC84
8BQ
3
2B
3C
1E
BC848BQ5
2B
3C
1E
L2 0876
1 2 3
4 6
R2522R
R32
27K
C41
220p
F
C19
1nF
R19100K
R5100K
BSS1
38Q
1
3D
2G
1S
ZM33
064Z
U4
1IN
3O
UT
YEL_
3MM
D3
2 1
C2
1uF
+C
110
0uF
D1
10BQ
040
21
C10
470u
F
ultra
tec
1999
Cop
yrig
htD
rg N
o:
Dat
eEC
NIs
sue
Dra
wn:
Ultr
asou
nd T
echn
olog
ies
Ltd
Gw
ent.
NP6
6BZ
. UK
Itton
, Che
psto
wFo
rest
ers
Hou
seD
ate:
ofSh
eet
Nam
e:PD
1VAS
~110
/19/
001
13:
24:0
4 PM
J41 2
J21 2
J11 2
LM38
6M
U2
7
18
2M
3P6 4
5
+C
1610
uF
+C
1710
uF
R34
10R
R1210R
R13
10R
R35
10R
Q2
RFD
8P05
SM
2D
1 G
3S
U1
CD
4013
3C
LK5
D4
RES
ET
6SE
T
2Q
1Q
U1
CD
4013
11C
LK9
D10
RES
ET
8SE
T
12Q
13Q
R174K7
R16
4K7
+C
40u
47F
+C
70u
47F
R15
2K2
R20
2K2
R29
2K2
R14
1K0
R2
1K0
R21
1K0
R26
1K0
+C11100uF
+C
1510
0uF
+C
1410
0uF
+C
3310
0uF
+C
2610
0uF
+C
2910
0uF
C18
100n
F
C13
100n
F
C22
100n
F
C21
100n
F
C8
100n
F
C9
100n
F
C43
100n
F
C47
100n
F
C45
100n
F
C31
100n
F
C24
100n
F
C28
100n
F
R7
1M
R10
1M
R8
1M
R3
1M
C3410nF
C2710nF
C12
10nF
C3
10nF
C3910nF
Vcc
SW
Vrf
Vcc
TxSi
g
Vcc
SW
Vcc
TxSi
gVr
f
RxS
ig
RxS
ig
Vcc
SW
Nov
99
L4 =
083
9
L3 =
087
4
C44
,46
= 22
pF
C42
= 2
20pF
C40
,41
= 47
pF
C37
,38
= 22
pF8M
Hz
Com
pone
ntFr
eque
ncy
Com
pone
ntFr
eque
ncy
C46
= 4
7pF
C44
= 1
00pF
C40
= 1
00pF
C38
= 1
00pF
4MH
z
PD1
Vasc
ular
(5M
Hz)
Loud
spea
ker
Volu
me
Con
trol
Dat
a O
utpu
t Soc
ket
Wav
efor
m
0.5V
/KH
z
Filte
ring
Rec
eive
r
Tran
smitt
er
frequ
ency
to v
olta
ge c
onve
rter
Batte
ry In
put
1
NAS
Batte
ry L
ow
Uni
t On
/ Off
cont
rol
PD1 General Assembly
PD1+ GA
2MHz Transducer Assembly
File – shawn/PD1 Service Manual Issue 1 April 1999 Page 32