Ultrasound Technologies Fetatrack 310 User manual

Ultrasound Technologies Ltd
Fetatrack 310
Service Manual
Issue 1

©Ultrasound Technologies Ltd Issue 1 December 2004 Page 2
Ultrasound Technologies Ltd
Contents
INTRODUCTION......................................................................................................3
Specification ........................................................................................................................................................4
User Configuration.............................................................................................................................................6
SAFETY IN USE.......................................................................................................7
Special Precautions.............................................................................................................................................7
Electrical Shock Hazard.................................................................................................................................... 7
Explosion Hazard.............................................................................................................................................. 8
Handling the Delicate Transducers................................................................................................................... 8
Symbols used .................................................................................................................................................... 9
REFERENCE .........................................................................................................10
FETATRACK 310 front panel controls..........................................................................................................10
Recorder On/Off ............................................................................................................................................. 10
Front Panel Event Mark.................................................................................................................................. 10
Volume Up...................................................................................................................................................... 10
Volume Down................................................................................................................................................. 10
US1 / US2 Transducer Select ......................................................................................................................... 10
Toco Zero ....................................................................................................................................................... 10
Indicators and Connectors...............................................................................................................................11
Power on Indication........................................................................................................................................ 11
RS232 output .................................................................................................................................................. 11
Remote (patient) Event Marker....................................................................................................................... 11
Probe Connection............................................................................................................................................ 11
Internal Layout.................................................................................................................................................12
Dismantling Procedure.................................................................................................................................... 12
Circuit Description ...........................................................................................................................................13
Power supply Circuit....................................................................................................................................... 13
Ultrasound Circuit........................................................................................................................................... 14
Audio Amplifier.............................................................................................................................................. 14
Signal Pre-processing...................................................................................................................................... 15
Toco Circuit.................................................................................................................................................... 15
Microprocessor Circuit ................................................................................................................................... 16
Printer Interface .............................................................................................................................................. 16
Test Procedures.................................................................................................................................................17
Introduction..................................................................................................................................................... 17
Performance Checks ....................................................................................................................................... 17
Test Procedure .......................................................................................................Error! Bookmark not defined.
Parts Lists and Drawings.................................................................................................................................23

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Ultrasound Technologies Ltd
This booklet explains the operation and service of the FETATRACK 310
Antenatal Cardiotocograph. Care has been taken during the design and
manufacture of this product so that it meets all of the current safety
standards set down by IEC601-1 : 1988.
If you require assistance understanding any part of this document, or have
any questions relating to the operation of the FETATRACK 310 please
contact:
Ultrasound Technologies Ltd
Lodge Way
Caldicot
NP26 5PS
UK
Tel [phone]
Fax [phone]
EMAIL [e-mail]
This service manual contains circuit descriptions, diagrams, parts and spares
lists is available for the FETATRACK 310 that are correct at the time of
printing. Due to continuous improvement certain sections may differ in
newer units if you have any doubt please contact the address above.
To maintain the FETATRACK 310’s performance it is recommended that it
be included in a periodic maintenance programme.

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Specification
Ultrasound
Frequency 1.8 and 2.1 MHz continuous wave
Transducer Multi element wide angle
Audio Response 300 - 1 Khz
Range 50 - 210 bpm (European), 30 – 240 bpm (Americas)
Power Output <20mW/cm2
Indicators LCD heart rate and pulse indication
Toco
Transducer Differential External pressure transducer
Response 0 - 5 Hz
Scale 0 - 100
Indicators LCD Toco level indication
Data Presentation
strip chart recorder and alphanumeric / graphic display module.
Printhead 104mm thermal solid state printhead
Resolution 8 dots / mm
Speeds 1,2,3,cm/min
Paper Z fold pre-printed chart scale
Paper type Plain black thermal
Display 32 character by 2 line LCD display module
Keys 6 Keys (for paper start /stop, Volume up ,
Volume down, HR1/2, Toco Zero and Event.)
Indicators Green power on/ off
Data Storage
Paper Out 30 min out paper storage with power connected
Data File (optional) In excess of 48 hours of full resolution data
Upto 16 separate patient files with storage limit.
Power Supply
AC input voltage 200 - 260 VAC or 100 - 130 VAC (User selected)
Frequency 46 - 64 Hz
Power 60VA
Enclosure
Material Aluminum.
Safety
Classification Class 1 Type B IEC60601-1
Computer interface
Transfer 3 wire RS232
Data Rate 9600 baud
Data Standard 8 bits no parity 1 stop bit

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User Configuration
Firstly connect the AC supply cord.
It is necessary to set the operation of the FETATRACK 310 to meet your requirements.
Before turning the FETATRACK 310 on, press and hold down the Toco Zero button. Then, whilst
keeping the Toco Zero button pressed down, turn the FETATRACK 310 on by flicking the AC input on/off
switch which is located on the rear of the unit as part of the AC line input socket. When the unit is on
the front panel LED will be illuminated.
The FETATRACK 310 starts and then enters its User Configuration Mode, release the
Toco Zero button as soon as ‘Calibrate System’ is displayed .
You are then prompted to enter the date if different to that displayed.
To change the day and month press the Volume Up button. One press advances the
day by one, pressing the Volume Up button for longer advances the day by 10.
To change the year press the Volume Down button. One press advances the year by
one, pressing the Volume Down button for longer advances the year by 10.
When the correct date is displayed press the Toco Zero button once.
You are then prompted to enter the time if different to that displayed.
This works in a similar manner to the date with the Volume Up button advancing the
hours and the Volume Down button advancing the minutes.
When the correct time is displayed press the Toco Zero button once.
You are then prompted to enter the Toco Base Line offset.
This sets an artificial zero line for the toco transducer above zero, it can be set by
pressing the Volume Up or Volume Down buttons for a value between 0 - 20.
After setting this value the Toco will be set to this every time the Toco Zero switch is
pressed, and allows small negative Toco excursions to be seen on the chart.
When the correct time is displayed press the Toco Zero button once.
You are then prompted to enter the Toco Filter Value.
This sets the filtering within the monitor to produce a smoother Toco trace if required.
( The filter can remove some of the maternal breathing artefact). It is set by pressing
the Volume Up button for a value soothing value between 1sec and 2sec..
When the correct filter value is displayed press the Toco Zero button once.
You are then prompted to enter the Toco Range.
This sets the response of the Toco transducer to either a full scale of 100 or 200 on the
chart print out. It is set by pressing the Volume Up button for a value between 100 and
200..
When the correct range is displayed press the Toco Zero button once.

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You are then prompted to enter the Chart recorder speed.
This sets the initial turn-on speed of the chart recorder. Then once the chart is running
the speed can be further changed to 1 ,2 or 3 cm/min. It is set by pressing the Volume
Up button for a value of 1, 2 or 3 cm/min..
When the correct speed is displayed press the Toco Zero button once.
You are then prompted to select the Data Block on or off.
The Data Block is printed at the start of each recording, this function can be disabled
by setting Data Block to off. It changes from on to off and back again by pressing the
Volume Up button..
When the Data Block is set to your requirements press the Toco Zero button once.
You are then prompted to select the Tachycardia Alarm on or off.
The Tachycardia Alarm is triggered when the system detects a Tachycardia above 170
bpm and an alarm tone sounds. The alarm is tone is stopped by pressing the units
volume button. Tachycardia Alarm can be set to on to off and back again by pressing
the Volume Up button..
When the Tachycardia Alarm is set to your requirements press the Toco Zero button
once.
You are then prompted to select the Bardycardia Alarm on or off.
The Bradycardia Alarm is triggered when the system detects a Bradycardia below 100
bpm and an alarm tone sounds. The alarm is tone is stopped by pressing the units
volume button. Bradycardia Alarm can be set to on to off and back again by pressing
the Volume Up button..
When the Bradycardia Alarm is set to your requirements press the Toco Zero button
once.
The FETATRACK 310 will then restart and operate according to your settings.
The FETATRACK 310 is now operational, and the LCD screen will show US1 --- us2
---
(if the unit is only a single fetus monitor it will only display US1 ---) and a Toco
value.
Special Precautions
Your FETATRACK 310 Antenatal Cardiotocograph has been designed for electrical
safety. All the safety and operating instructions should be read before operating the
FETATRACK 310. Failure to do so could result in injury to the user, patient or
damage to the System and accessories.
Electrical Shock Hazard
Do not defeat the grounding integrity of this System. Protection against electrical
shock, in the event of failure of basic insulation, is provided by the connection of the
chassis to the safety ground. Safety grounding occurs only when the 3-wire cable and
plug provided with the system are connected to a properly grounded receptacle.
Do not remove the System cover. The System should be serviced by trained and
qualified personnel only. Contacting the hazardous voltages within the System could
cause serious injury.

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Do not use the System if the power cord has any cuts or openings.
Do not use the transducer if the cable has any cuts or openings.
Do not use the transducer if the transducer face is cracked or chipped.
Do not immerse the transducer cable connectors in any liquids. Electrical shock
could result.
Should the electrical safety fuses have to be replaced, use only fuses of the same type
and rating.
Explosion Hazard
Do not operate or use this system in the presence of flammable anaesthetics or gases
as it could lead to explosion.
Handling the Delicate Transducers
The transducers are delicate parts of the ultrasound system and should be treated with
care. The delicate crystals in the transducer may crack and render the transducer
unusable if the transducer is subject to shock. Room temperature liquids should be
used for cleaning. Never use alcohol or mineral oil as an acoustic coupling agent as
transducer or cable damage could occur.

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Symbols used.
The following symbols are used on the FETATRACK 310 and are in accordance with
IEC60601-1 : 1990.
Where they are associated with the connection of external equipment, that equipment
in all cases must meet the relevant safety standard.
Alternating current
Associated with power on indicator
Type B Equipment
Unit classification
Off (power: disconnection from the mains)
On (power: connection to the mains)
Attention, consult accompanying documents.
Associated with auxiliary connections see
operating instructions.
Dangerous voltage.
Associated with components internal to the FETATRACK 310.

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FETATRACK 310 front panel controls
The front panel keyboard area contains 6 keys used to control the operation of the unit, they
are all indicated by Icons to aid language variations.
Toco Zero.
Sets Toco channel
to preset baseline
value.
Select ultrasound channel
for audio output and twins
split trace.
Volume Down
Volume Up
Event Mark 1.
Places arrow in
upper portion of
chart
Recorder On /
Off and speed
control
Recorder On/Off and speed change
This key is used to control the operation of the recorder. Press once and the chart recorder will
start, each consecutive short press will change the speed . Press and hold the key will stop the
recording.
Event Mark 1
Places an event mark arrow at the top of the FHR scale .
Volume Up
This key is used to increase the audio volume level, or in configuration mode to change user
options.
Volume Down
This key is used to decrease the audio volume level.
US1 / US2 Transducer Select
Pressing this key changes the selected probe from US1 to US2 for volume output. This is used
when the unit is in Twins mode with two US channels for listening to either of the two fetus.
Toco Zero
This key zeros the toco trace to the selected baseline.

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Inputs / outputs and displays
Power on Indication
The green LED associated with the above symbol when bright indicates that power is
connected to the apparatus.
RS232 output
This output is for the connection of an external computer for data transfer. The maximum
voltage that can be applied to this output is 15VDC.
WARNING: Any external equipment connected to this output must meet the relevant safety
standard.
Remote Event Marker
Connection of an external event mark switch allows the patient to indicate events by printing
an arrow in the gap between the FHR and UA traces. The maximum voltage that can be
applied to this output is 15VDC.
Probe Connections US1, US2, Toco
This is for the connection of approved Doppler and toco transducers. The maximum voltage
that can be applied to this output is 15VDC.

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Internal Layout
With the top cover removed and the front panel facing you, there is one large printed
circuit board fixed to the base of the monitor this contains all the power supply circuits,
all the control circuits and the Ultrasound, Toco and digital signal processing circuits.
In addition, there is the Front panel displays, keyboard interface and printer drive circuits
card mounted on the Lid of the unit.
Dismantling Procedure
Note: Before disassembling the unit, unplug the transducers, accessories cable (if
present), and the power cord from the instrument.
To remove the Top Cover, remove the four screws around the edge on the bottom of the
unit. Open the recorder door and then carefully lift the lid upwards. The Top Cover can
now be removed taking care to disconnect the earth bonding cable connecting the lid to
the base, and carefully disconnecting the front panel pcb interface cables.
The recorder and display module can be removed from the lid by careful removal of the 2
screws holding the parts in place. Be careful not to loose the spacers lying behind these
cards.

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Circuit Description
Power supply Circuit
The 240/110 VAC supply enters the FETATRACK 310 via an IEC double fused inlet /
mains filter and switch and is fed to a torroidal transformer. The input supply voltage is
stepped down to a nominal 24 VAC and is then bridge rectified by D19, smoothed by C140.
Regulated Supplies
The voltage regulators (U28 and U29) are fed from D19 at a voltage of around 36VDC. These
oscillate at approximately 120 KHz transferring pulses of current into L12 and L14
respectively. The output of inductor is fed back directly into U28 (29) which at pin 1 is
reference comparator and alters the pulses transferred into the inductor to obtain a stable
voltage output. The output of U28 is 5V DC and U29 is 12V DC. Pulses of current in to
inductor L14 are also taken into a charge pump to provide a stable –12V DC after regulator
transistor Q14.
D19 also supplies current to the printhead and motor drive circuits via Q13 and U30 which
provides a stable 24V DC .
Printhead and Motor Drive Supply
The printhead requires pulses of current equalling 10A but for a very small amount of time,
therefore current is taken from the charge built up in C130 rather than expecting the power
supply to supply the pulses. Q13 is connected as an ON/OFF switch to the printhead
voltage circuits to act as protection. An explanation of its operation can be found in section
PRINTER INTERFACE. When ON, current is fed to U30 connected as a variable
voltage regulator with a range of +18 v to +24 v where VR1 adjusts this voltage.

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Ultrasound Circuit
Overview
The ultrasound circuit is built up of four discrete sections.
These are:
Oscillator and Transmitter amplifier
Receiver and Detector
Audio amplifier
Signal pre-processing.
These operate to produce a continuous wave of 2MHz ultrasound which is passed to the
transmitter 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 or passed via signal pre-
processing to the A/D converter for rate calculation.
The circuit board has the option of two ultrasound circuits which operated at different
frequencies, the operation of each is identical as so only one is described here. The current
nominal frequencies are 2.1MHz for US1 and 1.8MHz for US2.
Oscillator and Transmitter output.
L4 forms an oscillator with Q4 and its associated capacitors producing a sine wave drive at
the required frequency. This is fed via a high current output driver Q1 and output transformer
L1.
Receiver and Detector
The reflected Ultrasound signal is fed via a resonant transformer L1 to the gate of Q3, the
drain of this FET connects to the source of Q2 to form a cascode amplifier From the drain
of Q2 the amplitude complex of the received signal is detected by passing the signal
through a detector diode D3 . The raw low frequency heart complex is then amplified and
filtered by U1 where its associated components form a bandpass filter amplifier with a
bandwidth of 150Hz to 1KHz. This signal is passed to the audio section and the signal pre-
processing .
Audio Amplifier
The audio signal then passes to a input selector U25 where the user can select via the front
panel which Ultrasound channel will pass to the audio circuits and then to digital gain control
U24 and buffer amplifier U32, where the volume setting is determined by the microprocessor
subject to the user setting. From here the gain controlled signal is fed to the input of a
monolithic power amplifier U27 and from here to the loudspeaker at J11.

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Signal Pre-processing
The detected audio complex is fed to U5 a bandpass amplifier where the filter characteristics
are arranged to reject signals below 150Hz and above 1KHz , and the output is taken do a
digital AGC U3. The amplitude stabilised signal is then amplified and full wave rectified by
U2 . This full wave rectified signal is then buffered and smoothed by an active filter. The
smoothing is achieved by the low pass active filter having a 3db at 5Hz hence giving the
average value of the audio complex. This signal is then passed to the A/D converter stage of
the cpu U8 for further digital signal processing .
Toco Circuit
A stabilised 5V is fed to the toco transducer along with 0V which form the excitation of a
Whetstone bridge in the transducer. The Differential output of the transducer is fed via a high
gain differential amplifier U26 to a low pass filter U32 for signal smoothing into the A/D
converter U11 further digital signal processing U8.
Toco Zero is automatically adjusted by D/A converter U31 providing an offset voltage into the
input of U32 . Overall gain is adjusted by VR2.

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Microprocessor Circuit
The microprocessor circuit is arranged around MC68HC812 a fast second generation central
processing unit (CPU). When power is applied to the circuit a monitor circuit waits for the
power rail to become stable and then 100 ms later takes the reset on the CPU high (logic 1) to
5 v. This starts the CPU working by reading the bytes at the very top of its memory map
from the EPROM (ROM). This shows the CPU the start position in ROM from which to
start executing. This sets up all the peripheral devices, which includes an interrupt timer,
starts the system clock which consists of interrupts from the cpu to the watchdog ic at the
rate of 1 every millisecond. As all functions are time dependant nothing starts without this
clock. The CPU now reads all the preset variables from the battery protected RAM within
the real time clock. The battery source is a lithium 3.6 v cell with a nominal life of 10 years.
After the CPU has loaded the variables it rums a system check for any internal problems
which are reported on the system display.
Selection of the individual devices is controlled by cpu internal the chip select circuits.
Most analogue signals eventually require digital signal processing for display, chart
recording or digital transmission, the signals are presented to CPU, where an internal 8 bit
A/D converter with an 8 way multiplexed input converts the signals to digital form. The
converter accepts unipolar signals of 0 - 5 v..
The CPU with the display and keyboard circuit using on chip peripheral interface , as well as
detecting selection of ultrasound and the presence of an Event keypress.
Printer Interface
A proportion of the micro-circuit is dedicated to printer interface and control, the
primary interface circuit contains timers, serial drivers and peripheral drivers. The principal
of operation of the printhead and motor drive circuit is as follows :
Data is decoded by the software into bit positions within the allowable area of the printhead
. This data is then passed in serial form with a clock signal into the printheads serial buffer.
The data is latched by a pulse from the cpu via CMOS buffer, this gives added protection in
the case of device failure. Data is then burnt onto the printhead by strobes 1 to 4 from the
cpu which last less than 1 mS .
Under normal conditions with the printer OFF there is no supply connected to the printhead
or chart motor. Only when printing is requested does the cpu turn on the 24VDC supply.
The cpu also drives the chart recorder stepper motor via the high current microstep interface.
Data Storage (optional)
Full resolution patient data is stored on the optional data file when fitted to the unit. The file
can store in excess of 48 hours of data that can be subdivided into 16 separate patient files.
The data can be recalled to strip chart recorder or to UltraTrace fetal PC software. The Data
file card is fitted to the serial 2 channel of the controller card.

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Test Procedures
Introduction
The following sections details tests to ensure that the FETATRACK 310 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 test procedures may be performed without removal of the circuit board from the unit.
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 preventive maintenance plan and should
be performed on a regular basis.
1) Plug the monitor line cord into a grounded receptacle of suitable line voltage and
frequency as indicated on the rear panel of the FETATRACK 310 .
2) Turn monitor on. The green front panel LED will illuminate.
3) The display will first show the system selftest followed by the software revision This
indicates the instrument is switched on and awaiting inputs.
4) Load chart paper to recorder (for assistance see operating instructions) ensure paper is
correctly aligned.
5) Depress printer on/off and recorder will run at either 1,2 or 3 cm/min dependent on the user
preset value.
Ultrasound
6) Connect ultrasound transducer to the yellow or blue US sockets on the front panel and
increase volume to maximum.
7) Place transducer in palm of hand and gently stroke the back of the hand at a constant rate of
about 2 times a second.
8) Check audio volume is present, digital display will display the simulated rate (approx
120 ) and correspond with the data being printed on the chart paper.
UA / Toco / Contractions
9) Connect the toco transducer to the grey UA input socket on the front panel and press UA
zero to set the baseline (baseline resets to value 1 -> 20 as selected in set up procedure).
10) Apply pressure onto the centre of transducer and check that the toco trace on chart
recording increases to 100 + 10%. Remove load and trace will return to baseline.
Event Marker
11) Connect the hand held remote event marker to the external mark socket. Depress the
button once and note that a half arrow is printed on the bottom of FHR recording.

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Setting up the monitors
The mode of operation of the monitor is programmable through the front panel to give a
certain amount of customisation. The programming mode is entered by pressing and holding
UA Zero while turning the monitor ON.
Details of the user programmable options are at the beginning of this manual.

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Parts lists The following section contains parts list for the FETATRACK 310.
FETATRACK 310 Control Board
Device Value Ref Quantity
Capacitor electrolytic 10000uF Electrolytic 35V Panasonic TSUP snap in C130 1
Capacitor electrolytic 1000uF Electrolytic 35V Panasonic
EEUFC1V102 C134 1
Capacitor electrolytic 270uF Electrolytic 16V Panasonic FC C142,148 2
Capacitor electrolytic 220uF Electrolytic 35V BCC 136 60221 C96,108,133,138 4
Capacitor electrolytic 120uF Electrolytic 50V Panasonic
EEUFC1H121 C131,136 2
Capacitor 100uF Electrolytic 16V ssm 16V C22,30,38,65,73,81,99,119,156 9
Capacitor electrolytic 22uF 100V Panasonic EEUFC2A220 C143,146,151 3
Capacitor sm 1206 1uF Ceramic Z5U 1206 C37,80,160,162 4
Capacitor sm 0805 100nF Ceramic X7R 0805
C1,2,6,10,11,13,14,19,20,21,23,24,27,28,32,33,
40,41,44,45,49,53,54,56,57,63,64,66,67,70,71,75,76,
83,84,87,90,91,93,94,97,98,100,104,105,106,107,
109,110,111,113,114,115,116,117,120,121,122,123,125,1
27,128,129,132,135,141,145,149,150,154,155,157,158,15
9,161,163,164, 77
Capacitor sm 0805 47nF Ceramic X7R 0805 C43,86 2
Capacitor sm 0805 33nF Ceramic X7R 0805 C88 2
Capacitor sm 0805 10nF Ceramic X7R 0805 C9,18,29,34,35,36,39,52,61,72,77,78,79,82,137,140, 16
Capacitor sm 0805 4n7F Ceramic X7R 0805 C112 1
Capacitor sm 0805 3n3F Ceramic X7R 0805 C89 1
Capacitor sm 0805 1nF Ceramic COG 0805 C4,8,17,26,42,47,60,62,69,85,124 11
Capacitor sm 0805 680pF Ceramic COG 0805 C7,15,50,58 4
Capacitor sm 0805 470pF Ceramic COG 0805 C48 1
Capacitor sm 0805 220pF Ceramic COG 0805 C3,16,46,51,55,59 6
Capacitor sm 0805 100pF Ceramic COG 0805 C5 1
Capacitor sm 0805 47pF Ceramic COG 0805 C12 1
Capacitor sm 0805 22pF Ceramic COG 0805 C101,102 2
Capacitor sm 10uF Tantalum 20V Case size B C153 1
Capacitor sm 1uF Tantalum 35V Case size A C118,126,139,144 4
Capacitor sm 0u47F Tantalum 25V Case size A C25,31,68,74 4
IC Digital sm CD74HCT04D U15 1
IC Digital sm CD74HCT541E U16 1
IC Digital sm MC68HC812A4 U8 1
IC Digital sm AM27C256-150JC U9 1
IC Digital sm HM62256 (uPD43256BGU-70LL) U22 1
IC Digital sm NJM3777E3 (PBL3777so) U20 1
IC Digital sm NJU39612E2 (PBM3962so) U23 1
IC PSU sm LT1076CQ U28,29 2
IC PSU LM338T U30 1
IC RTC sm DS1305E U13 1
IC Digital sm MAX202E U14 1
IC Digital sm MAX549ACUA U31 1
IC Digital sm MAX1243BESA U11 1

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IC Analogue sm ZM33064G U12 1
IC Analogue sm DG211DY U25 1
IC Analogue sm LM324M U1,2,4,5,6,26,32 7
IC Analogue TDA2614 U27 1
IC Analogue sm X9C103S U3,7,24 3
IC Analogue sm LM336M - 2.5 U10 1
IC Socket sm PROM 32way plcc U9 1
Diodes sm IR10BQ040 D20,21,22,23 4
Diodes sm BAS16 D1,2,6,7,9,10,14,15,17,18,24,25 12
Diodes sm BAT54 D3,11 2
Diodes sm BZX84 C5V1 D4,5,8,12,13,16,26 7
Diodes sm BZX84 C6V2 D27,28 2
Diodes Bridge GBU4A D19 1
Transistor RFD8P05SM Q13 1
Transistor sm BC848B Q1,5,6,10,11,12 6
Transistor sm FZT949 Q14 1
Transistor sm MMBF4416LT1 Q2,3,4,7,8,9 6
Crystal 32KHz 85SMX X2,3 2
Resistors 1% sm 0805 1R R95,96,117,118 4
Resistors 1% sm 0805 10R R2,6,40,44,133,158 6
Resistors 1% sm 0805 22R R14,52,100,132, 4
Resistors 1% sm 0805 100R R1,9,32,36,39,47,70,74108,110,122,152, 12
Resistors 1% sm 0805 120R R141 1
Resistors 1% sm 0805 470R R18,56,165 3
Resistors 1% sm 0805 1K0 R13,17,37,51,55,75,120,121,130,148,149,179, 12
Resistors 1% sm 0805 1K2 R79,82,125 3
Resistors 1% sm 0805 1K5 R8,46 2
Resistors 1% sm 0805 2K2 R11,19,49,57,140,143 6
Resistors 1% sm 0805 2K7 R135,138,139 3
Resistors 1% sm 0805 3K3 R180,181 2
Resistors 1% sm 0805 4K7 R34,72,144,150,151,154,155 7
Resistors 1% sm 0805 10K
R5,20,21,22,23,24,35,38,43,58,59,60,61,62,73,76,78,
81,83,85,86,87,88,89,90,91,92,93,94,97,99,101,104,106,
111,112,114,115,116,123, 126,131,142,
153,160,161,162,167,168,172,173,174,176,178, 54
Resistors 1% sm 0805 12K R119 1
Resistors 1% sm 0805 15K R98,128 2
Resistors 1% sm 0805 16K R84 1
Resistors 1% sm 0805 22K R27,65,137,156,157 5
Resistors 1% sm 0805 27K R7,45,77,80,127 5
Resistors 1% sm 0805 36K R25,63 2
Resistors 1% sm 0805 47K R30,68,124 3
Resistors 1% sm 0805 68K R12,16,28,50,54,66 6
Resistors 1% sm 0805 100K R3,4,10,15,29,33,41,42,48,53,67,71,109,134,136,170,171 17
Resistors 1% sm 0805 180K R26,64 2
Resistors 1% sm 0805 220K R163,177 2