Bistos BT-300 Fetal Monitor - Service manual

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BT-300 Service Manual V2.0
Table of Contents
TERMS OF WARRANTY................................................................3
CAUTION.........................................................................................3
HOW TO CONTACT US ….............................................................4
DEFINITION OF WARNING, CAUTION, NOTE.............................6
GENERAL PRECAUTION ON ENVIRONMENT............................7
GENERAL PRECAUTION ON ELECTRIC SAFETY.....................8
SECTION 1. GENERAL INFORMATION .................9
1.1 Product Overview....................................................................9
1.2 Product Features...................................................................10
1.3 Product Configuration..........................................................10
SECTION 2. TECHNICAL DESCRIPTION...................................11
2.2 Main Unit.................................................................................12
1.2. Composition.........................................................................12
2.2. Main Board..........................................................................13
2.2.3Key Board.............................................................................25
2.3Doppler Probe.........................................................................26
2.3.1 Composition.......................................................................27
2.4UC Probe................................................................................27
2.4.1 Composition.......................................................................27
2.4.2 Technical Description.........................................................28
SECTION 3. TROUBLESHOOTING.............................................30
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BT-300 Service Manual V2.0
3.1 Warning Sign Occasion and Status Checking...................30
Alarm Occasion and Status Checking Up.................................31
3.2 Troubleshooting on the Other Situation.............................31
SECTION 4. MAINTENANCE AND CLEANING..........................33
4.1 Maintenance and Cleaning...................................................33
 Caution....................................................................................34
4.2 Regular Inspection................................................................34
SECTION 5. SPECIFICATIONS....................................................35
2
BT-300 Service Manual V2.0
Terms of Warranty
- This product is manufactured and examined by strict quality control and 
inspection system.
- Compensation standard concerning repair, replacement and refund of the 
product complies with “Consumer’s protection law” issued by Economic 
Planning Dept.
- BT-300 is guaranteed by BISTOS Co., Ltd. And its warranty period is two 
years from the date of purchase.
- Warranty repair or replacement will be made by BISTOS Service Center 
with free of charge during warranty period if properly used under normal 
condition in accordance with the instructions for use.
- In the event of a malfunction or failure during warranty period, customer 
should inform BISTOS Co., Ltd. of the model name, serial number, date 
of purchase and explanation of failure about the defective equipment.
3
Caution
Federal law restricts this device to sale by 
or on the order of a physician
BT-300 Service Manual V2.0
How to contact us …
4
BT-300 Service Manual V2.0
5
BT-300 Service Manual V2.0
Definition of Warning, Caution, Note
6
You can contact us the following address and telephone numbers
for services and supplies.
Product and
Order Inquiries
Oversea Sales Team
BISTOS Co., Ltd.
201, 2F, 239-15, Gasan-Dong,
Geumcheon-Gu, Seoul, Korea
Tel : +82-2-862-0642
Fax: +82-2-862-0644
Service 
Request
and
Technical 
Support
Customer Service Team
BISTOS Co., Ltd.
201, 2F, 239-15, Gasan-Dong,
Geumcheon-Gu, Seoul, Korea
Tel : +82-2-862-0642
Fax: +82-2-862-0644
Our Website &
Email address
Website: http://www.bistos.co.kr
Email: bistos@bistos.co.kr
http://www.bistos.co.kr/
BT-300 Service Manual V2.0
 For a special emphasis on agreement, terms are defined as 
listed below in operation manual. Users should operate the 
equipment according to all the Warning and Caution 
instructions.
 Manufacturer or Sales agency takes no responsibility for any 
kind of damage or breakdown that is caused by misuse and 
failure to maintain the equipment. 
Warning
A Warning indicates a potentially hazardous situation which, if 
not avoided, could result in death or serious injury.
Caution
A Caution indicates a potentially hazardous situation which, if 
not avoided, may result in minor or moderate injury.
Note
A Note indicates a particular point of information; something 
on which to focus your attention.
General Precaution on Environment
 Do not keep or operate the equipment under the environment 
listed below.
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BT-300 Service Manual V2.0
General Precaution on Electric Safety
Check the items listed below before operating the equipment.
- Be sure that power supply line is appropriate to use. 
(Power Adaptor Input: 100 ~ 250V AC, Power Adaptor Output: 16V, 
2.8A). 
- Be sure that the entire connection cable of the system is properly 
8
Avoid placing in an area
exposed to moisture. Do 
not touch the equipment 
with
wet hand.
Avoid exposure to
direct sunlight 
Avoid placing in an area
where there is a high
variation of temperature.
Operating 
temperature
ranges from 10°C to
40°C. Operating humidity
ranges from 30% to 
85%.
Avoid in the
vicinity of 
Electric
heater 
Avoid placing in an area
where there is an
excessive humidity rise 
or
ventilation problem.
Avoid placing in
an area where
there is an 
excessive
shock or vibration.
Avoid placing in an 
area
where chemicals are
stored or where there is
in danger of gas 
leakage.
Avoid dust and
especially metal
material into the
equipment.
Do not disjoint or dis-
assemble the equipment. 
BISTOS Co., Ltd. takes no
responsibility of it 
Power off when
the equipment 
is
not fully 
installed. 
Otherwise, the
equipment 
could be 
BT-300 Service Manual V2.0
and firmly fixed.
Note
The equipment should not be placed in the vicinity of electric 
generator, X-ray, broadcasting apparatus to eliminate the 
electric noise during operation. Otherwise, it may cause 
incorrect result.
Self-power line is important for BT-300. To use the same power 
source with other electric instruments may cause incorrect 
result.
Note
BT-300 is classified as listed below;
- This equipment conforms to Class I, Type-BF. 
- Do not use the equipment in the vicinity of flammable 
anesthetics and solvents. 
- The equipment conforms to Class I according to IEC/EN 
60601-1 (Safety of Electric Medical Equipment)
- This equipment conforms to Level B according to IEC/EN 
60601-1-2 (Electromagnetic Compatibility Requirements)
Note
Accessory equipment connected to the analog and digital 
interfaces must be certified according to the respective IEC 
standards ( e.g. IEC 950 for data processing equipment and IEC 
601-1 for medical equipment ). Furthermore all configurations 
shall comply with the system standard EN 60601-1-1:1993.
If in doubt, consult the technical service department or your 
local representative.
Section 1. General Information 
1.1 Product Overview
BT-300 is the fetal monitor that measures the fetal heart rate(FHR) 
which may be evaluated to predict fetal status and uterine 
contraction. BT-300 irradiates ultrasound wave to the abdomen of a 
pregnant woman, and detects the Doppler frequency signal reflected 
from the heart of the fetus. BT-300 analyzes this signal and displays 
the heart rate by LED. Also, BT-300 provides the sound from the 
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BT-300 Service Manual V2.0
heart of fetus.
BT-300 measures the uterine contraction of a pregnant woman by 
pressure sensors anddisplays the numerical values.
And BT-300 prints the heart rate of the fetus and the values of 
uterine contraction. 
1.2 Product Features
 BT-300 records the heart rate of the fetus, the uterine contraction 
of a pregnant woman, and basic information of the equipment 
with a provided thermal printer.
 BT-300 is capable of Monitoring of fetal heart rate with one or two 
pulsed Ultrasound Transducer(s). 
 BT-300 can record automatically with thermal printer through 
printer setup.
 BT-300 is compact and light, potable and easy to use.
 BT-300 uses a free voltage(100 – 240VAC input) power adaptor.
 
1.3 Product Configuration
BT-300 system consists of the followings. Unpack the package and 
check out the following items. Also, be sure to check to see any 
damage of main body and accessories
① BT-300 Main Body
② Ultrasound Transducer(Doppler Probe) - 2 EA(1 EA for BT-300S)
③ Tocotransducer(UC Probe) - 1EA
④ Event Marker -1EA
⑤ Thermal Print Paper - 2EA
⑥ Power Adaptor -1EA
⑦ Power Cord -1EA
⑧ Ultrasound Gel -1EA
⑨ Abdominal Transducer(Probe) Belt -3 EA(2 EA for BT-300S)
⑩ User’s Manual -1EA
Contents Name Description
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BT-300 Service Manual V2.0
BT-300 Main 
Body
Main body of BT-300
 (2-year Warranty)
Doppler Probe
Ultrasound Transducer for 
Measuring FHR
UC Probe
Pressure Sensor(Tocotransducer) 
for Measuring Uterine contraction
Event Marker
Used for a specific event(for 
example, fetal Movement)
Z-folded type 
Paper
Z-folder type thermal Paper
Probe Belt
Used for Holding Doppler Probe 
and/or UC Probe
Power Adaptor
Adaptor for transform AC Power to 
DC 16V
Power Cord AC Power cord 
Ultrasound Gel Ultrasonic coupling gel 
Section 2. Technical Description
2.1 General
BT-300 is capable of monitoring fetal heart rate and maternal 
uterine contractions. Simultaneous trends of fetal heart rates (FHR) 
and uterine activity (UA) are plotted by the built-in chart recorder. 
FHR and UA are displayed continuously at numeric display on the 
front panel.
Measuring fetal heart rate is using 1MHz ultrasound wave which 
transmits the burst pulse to the 7 ultrasound sensors about 3.47KHz 
periodically. This wave is reflected to the part of different medium. 
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BT-300 Service Manual V2.0
Particularly, the reflection wave is shifted from moving targets like 
heart, blood, etc. This phenomenon is a Doppler effect. This 
reflected signal is converted to electrical signal and it can get some 
useful information by many other processes.
Also, BT-300 measures the uterine contraction of a pregnant woman 
by pressure sensors and displays waveform by means of numerical 
values. This waveform informs the period and magnitude of the 
uterine contraction.
DSP(digital signal processor) calculates the fetal heart rate and 
uterine contraction, and transmits them to CPU by serial 
communication.
CPU displays these values to the 7-segment, records on the thermal 
paper and transmits to serial port for central monitoring system. 
CPU performs these operations by input of key.
Refer to the operator’s manual for more detailed operations.
2.2 Main Unit
1.2. Composition
 
12
①
BT-300 Service Manual V2.0
① Key Board
② Print Engine
③ Main Board
2.2. Main Board
 Circuit Diagram
< Analog Part >
13
② ③
BT-300 Service Manual V2.0
A V P 1 2
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< Digital Part >
14
BT-300 Service Manual V2.0
/ I D D _ R D
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6
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1 8
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1 6
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1 2
2
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4
5
6
7
8
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1
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1 8
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1 31 2
2
3
4
5
6
7
8
9
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Q 2
Q 3
Q 4
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D 2
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D 6
D 7
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5 2 6 7 - 2
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C V D D : 1 . 8 V D V D D : 3 . 3 V
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T M S 3 2 0 V C 5 4 0 2
3143440505776 70
9 3
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9 9
1 0 0
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1 0 2
1 0 3
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1 1 3
1 1 4
1 1 5
1 1 6
1 1 7
1 1 8
1 1 9
1 2 1
1 2 2
1 2 3
1 3 1
1 3 2
1 3 3
1 3 4
1 3 6
1 3 7
1 3 8
1 3 9
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7
8
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1 0 8
1 0 9
5 8
6 9
8 1
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6
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4 6
5 4
5 3
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5 9
4 9
4 8
4 4
4 3
4 7
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4 2
4 1
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8 2
9 6
9 7
7 9
7 8
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6164656667 63 32 31 2730 28 2629
9 8
21 202224 19232592 55 18 13129 127 1762
1 0 5
9
Vs
s
VssVs
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Vs
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Vs
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V s s
Vs
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Vs
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Vs
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DV
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DV
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DV
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DV
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DV
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CV
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CV
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D 1
D 2
D 3
D 4
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D 6
D 7
D 8
D 9
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D 1 1
D 1 2
D 1 3
D 1 4
D 1 5
A 0
A 1
A 2
A 3
A 4
A 5
A 6
A 7
A 8
A 9
A 1 0
A 1 1
A 1 2
A 1 4
A 1 5
A 1 7
A 1 8
A 1 9
H D 0
H D 1
H D 2
H D 3
H D 4
H D 5
H D 6
H D 7
H C N T L 0
H C N T L 1
B F S X 1
B F S X 0
B D X 1
B D X 0
B C L K X 1
B C L K X 0
B F S R 1
B F S R 0
B D R 1
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B C L K R 1
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1 1
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7
1 3
8
2
1
3
4
5
6
1 6
1 5
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T 2 I N
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R 2 O U T
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C 1 1 8
R 1 1 6
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5
9
4
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3
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2
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V 1 0 0
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P C B - 1 0 0 - M A I N - P 0 3 C
B T 3 0 0 D / S D I G I T A L C I R C U I T d e s i g n e d b y B I S T O S R & D D e p t .
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2 2, 1 0 2 2 , 2 0 0 3수 요 일 월
T i t l e
S i z e D o c u m e n t N u m b e r R e v
D a t e : S h e e t o f
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U 4 0 B
7 4 H C 0 8
4
5
6
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1
R 1 6 2
D V P 5
D V P 5
D V P 5
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U 3 3 A
7 4 H C 3 9 3
1
2
3
4
5
6
14
7
A
C L R
Q A
Q B
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7 4 H C 3 9 3
1
2
3
4
5
6
14
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GN
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C 1 0 8C 1 0 7
C 1 4 9
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M C K 1
V 1 1 0
1
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7 4 H C 0 4
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7 4 H C 0 4
1 11 0
14
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V 4 7
1
C 7 7 C 8 1
R 9 4
D V P 3 . 3
D [ 0 . . 7 ]
R 1 6 0
R 1 4 5
R 1 0 1
C 1 1 4
L 3
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D V P 5
D V P 5
S E G E 1
S E G _ G
P D 5
C 1 7 1
R 1 2 0
R 1 2 9
C 1 4 8
V 7 1
1
V 3 6
1
V 6 9
1
D O P 1 _ I D
D 4
D O O R
M O T O R _ C K 3
V O L _ D N 1 / V O L _ U P
C 1 2 7
V 6 7
1
C 9 6
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R T C _ A S
V O L _ D N 2 / V O L _ D N
P D 0
V 5 3
1
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C 8 6
+
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S E G E 3
P D 4
P D 1
R 1 4 6
D V P 5
D V P 5
V O L _ D N 1 / V O L _ U P
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R 1 4 4
J 1 1
P I C D / L
1
2
3
4
5
6
7
D V P 5
C 1 1 1
Q 1 3
D V P 3 . 3
S E G E 4
P D 2
U 3 6
L M 1 1 1 7 M P X - 1 . 8
3
1
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DJ
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U 3 4 B
7 4 H C 7 4
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1 1
9
8
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D V P 5
1 6 K
V 9 9
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L E D _ H 1 R
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P D 3
R T C _ D S
R 1 4 0
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C 1 5 8
C 7 9
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D V P 5
S E G _ A
S E G _ B
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1
R 1 5 4
U 3 9 C
7 4 H C 0 4
5
6
C 8 8
D V P 5
D V P 5
L E D _ H 2 G
P D [ 0 . . 7 ]
U 3 7 D
7 4 H C 0 8
1 2
1 3
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R 1 3 1
C 1 2 3
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D O P 1 _ I
R T C _ R / W
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P D 7
V 9 1
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R 1 5 5
J 1 7
5 2 6 7 - 3
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2
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U 4 0 , 1 4 P
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P D 0
P D 7
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U 4 1 D
7 4 H C 0 8
1 2
1 3
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V 1 0 4
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V 9 3
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S E G E 4
P D 3
U 2 8
T D 6 2 0 6 4 A F
3
6
1 1
1 4
2
7
9
1 6
8
1
18 17
B 1
B 2
B 3
B 4
C 1
C 2
C 3
C 4
K 2 & 3
K 1 & 4
G2 G1
U 4 3
P I C 1 6 C 7 7 / T Q F P
1 8
3 0
7
2 8
1 9
2 0
2 1
2 2
2 3
2 4
3 2
3 5
3 6
3 7
4 2
4 3
4 4
1
3 8
3 9
4 0
4 1
2
3
4
5
2 5
2 6
2 7
3 1
8
9
1 0
1 1
1 4
1 5
1 6
1 7
M C L R / V P P
O S C 1 / C L K
V D D
V D D
R A 0 / A N 0
R A 1 / A N 1
R A 2 / A N 2
R A 3 / A N 3 / R E F
R A 4 / T 0 C L K
R A 5 / A N 4 / S S
R C 0 / T 1 O S O / T 1 C L K
R C 1 / T 1 O S I / C C P 2
R C 2 / C C P 1
R C 3 / S C K / S C L
R C 4 / S D I / S D A
R C 5 / S D O
R C 6 / T X / C K
R C 7 / R X / D T
R D 0 / P S P 0
R D 1 / P S P 1
R D 2 / P S P 2
R D 3 / P S P 3
R D 4 / P S P 4
R D 5 / P S P 5
R D 6 / P S P 6
R D 7 / P S P 7
R E 0 / R D / A N 5
R E 1 / W R / A N 6
R E 2 / C S / A N 7
O S C 2 / C L K O U T
R B 0 / I N T
R B 1
R B 2
R B 3
R B 4
R B 5
R B 6
R B 7
R 1 1 7
 Technical Description
1 Doppler signal generation circuit
The burst signal drives the ultrasound sensor using by Q1 ~ 
15
BT-300 Service Manual V2.0
Q3. 
The L-C impedance matching circuit is used to match the 
received ultrasound signal and the signal is amplified about 
40 dB at Q5.
U2 demodulates by 1MHz to get the Doppler signal and the 
most adequate signals are abstracted through the 4 stages 
filter.
BT-300 uses the 1MHz ultrasound, so the Doppler frequency is 
low frequency about 100 ~ 200Hz. The OP Amps (U6A, U6D) 
perform the frequency doubling by full-wave rectifier to hear 
clearly when user hears the fetal heart signal. After using the 
amplifier and LPF, this signal is adjusted the volume (U5, 8 
steps) and transferred to audio amplifier (U8).
The other rectifier circuit (U4A, U4D) is used to calculate the 
heart rate, this signal is amplified and used LPF for envelope 
detection. And adjust the DC level to fit in the input level of 
U25, A/D converter (0 ~ 3.3V).
2 Sound output circuit
The signal of Doppler (DOP1_S, DOP2_S), alarm and 
information are summed in U7A. The signal for alarm(bee bee 
bee) and information(ding~ dong~) is PWM signal 
generated from U43.
This signal is converted to be able to hear using RC low pass 
filter. This signal and Doppler signal are integrated and output 
to speaker by audio amplifier (U8). 
③ A/D converter & DSP circuit
MCP3204(U28) A/D converter is possible to convert to 4 
channels and converts each signal DOP_1HR, DOP2_HR, UC to 
12 bits digital signal by 200Hz periodically. The range of analog 
input signal of this A/D converter must be in 0 ~ +3.3V. The 
converted digital signal is transmitted to DSP(U16) by serial 
and calculated an useful value using many signal processing 
techniques. DSP is TMS320VC5402 by TI company and the 
fetal heart rate is calculated at 0.25 second using auto-
correlation algorithm. The output is transmitted to CPU to 
display and record.
④ TX burst pulse generation circuit
U33, U34, U37~42 generate the burst signal for driving the 
ultrasound sensor and control signal for demodulation.
The timing diagram is below.
< Timing Diagram >
16
3.47KHz
BT-300 Service Manual V2.0
⑤ CPU circuit
 CPU(U43) is PIC16F77, when it has malfunction, CPU resets 
itself using MM1075(U17) watch-dog IC. FHR and UA are 
displayed on the 7-segment and signal quality is displayed on 
the LED. 
 Thermal print is operated +24V. CPU controls the stepping 
motor and TPH to record the calculated data on the thermalpaper. Door open or paper out is recognized by sensor. If that 
situation happens during recording, then CPU stops recording 
and displays “See Prn” on the display panel.
 Time and date are calculated automatically at the 
DS12C887(U18). CPU reads the value and records on the 
recording paper.
Each key is recognized by CPU which performs each 
operation.
 Connection
A. Doppler Probe Connector
17
DOP1_I,Q
DOP2_I,Q
Tx
Receive 
Time
DOP1_P
32 usec
DOP2_P
128 
usec
128 
usec
BT-300 Service Manual V2.0
J 1
L M B 0 5 0 9 - 6 P
1
2
3
5
6
8N 1
N 2
N 3
S I G N A L
J 2
L M B 0 5 0 9 - 6 P
1
2
3
5
6
8N 1
N 2
N 3
S T I M U L A T O R
A V P 1 2
D O P 2 _ I D
A V P 1 2
D O P 1 _ I D
S I G N A L
Pin Name I/O Description
1 Stimulat
or
I Acoustic stimulator enable signal
2 GND - Ground
3 AVP12 O +12V power
5 GND - Ground
6 Signal I/O Transmitting and receiving ultrasound 
signal
8 DOP_ID I Identity signal
B. UC Probe Connector
A V P 1 2 S I G N A L
U C _ I D
J 7
L M B 0 5 0 9 - 6 P
1
2
3
5
6
8N 1
N 2
N 3
Pin Name I/O Description
1 NC - -
2 GND - Ground
3 AVP12 O +12V power
5 Signal I UC out signal
6 NC - -
8 UC_ID I Identity signal
C. Mark Jack Connection
18
BT-300 Service Manual V2.0
J 6
5 2 6 7 - 2
1
2
S I G N A L
Pin Name I/O Description
1 Signal I Mark enable signal
2 GND - Ground
D. Doppler 2 control signal (only BT-300 dual)
D O P 2 _ I
D O P 2 _ H R
S I G N A L J 5
A N A L _ S I G
2 4 6 8
1 3 5 7
V O L 2 _ 2
V O L 2 _ 1
D O P 2 _ Q
A V P 5
D O P 2 _ P
D O P 2 _ S
A V P 1 2
J 3
A N A L _ C O N
2 4 6 8
1 3 5 7
V O L 2 _ 0
J 4
T R A N S D U C E R
2
4
6
8
1
3
5
7
Name Description
Signal Transmitting and receiving ultrasound signal
DOP2_P Digital pulse for transmitting
VOL2_0 Volume control signal 0
VOL2_1 Volume control signal 1
VOL2_2 Volume control signal 2
DOP2_Q 180° control signal for demodulation
DOP2_I 0° control signal for demodulation
DOP2_S Doppler sound signal
DOP2_HR Doppler heart rate signal
AVP5 +5V power
AVP12 +12V power
E. Speaker Connector
19
BT-300 Service Manual V2.0
J 6
5 2 6 7 - 2
1
2
S I G N A L
Pin Name I/O Description
1 Signal O Sound output
2 GND - Ground
F. Input Power Connector
I V P 1 6
J 1 5
H T J - 0 2 0 - 0 4
1
23
J 1 6
5 2 6 7 - 2
12
Pin Name I/O Description
1 IVP I +16V input power
2 IVP16 I +16V input power through power switch
G. CPU Reset Connector
R E S E T
V P P
J 1 0
P I C D / L R S T
1
3
2
4
Pin Name I/O Description
1 VPP I Power for program writing to CPU
2 RESET O CPU reset signal
3 NC - -
4 RESET O CPU reset signal
H. Dual / Single Recognized Connector
20
BT-300 Service Manual V2.0
D V P 5
J 1 8
D U A L / S I N G L E
1 2S I G N A L
Pin Name I/O Description
1 DVP5 O +5V power
2 SIGNAL I Recognized signal
I. CPU Program Download Connector
V P P
/ I D D _ R D
/ K E Y D _ R D
J 1 1
P I C D / L
1
2
3
4
5
6
7
P D 7
P D 6
D V P 5
This connector is used only to download the CPU program.
J. Central Monitor Interface Connector (RS-232C)
( F E M A L E )
T X
R X
P 1
D - S U B 9 P
5
9
4
8
3
7
2
6
1
N 2
N 1
Pin Name I/O Description
2 RX I Receiving signal for central monitor
3 TX O Transmitting signal for central monitor
5 GND - Ground
K. Key Board Connector
21
BT-300 Service Manual V2.0
S E G E 6
J 1 3
H E A D E R 2 0 X 2
2
4
6
8
1 0
1 2
1 4
1 6
1 8
2 0
2 2
2 4
2 6
2 8
3 0
3 2
3 4
3 6
3 8
4 0
1
3
5
7
9
1 1
1 3
1 5
1 7
1 9
2 1
2 3
2 5
2 7
2 9
3 1
3 3
3 5
3 7
3 9
L E D _ I N F O
S E G _ V 5
S E G E 0
L E D _ H 1 R
L E D _ R E C / Z O O M
S E G _ C
L E D _ H 2 RL E D _ H 2 G
V O L _ U P 1 / A L M
R E C / Z O O M
L E D _ A L M / R E C
S E G E 1
L E D _ H 1 G
S E G _ B
S E G _ V 6
S E G _ V 3
V O L _ U P 2
L E D _ A L M
S E G _ V 7
V O L _ D N 1 / V O L _ U P
A L M / R E C
S E G _ E
S E G E 2
S E G _ A
S E G _ D
V O L _ D N 2 / V O L _ D N
S E G _ V 4
S E G E 5
S E G E 3
U C _ R E F
S E G _ V 1 S E G _ V 2
S E G _ F
S E G _ G
S E G E 7
S E G E 4
Pin Name I/O Description
1 LED_H1G O FHR1 green rhythm LED signal
2 LED_H1R O FHR1 red rhythm LED signal
3 LED_H2G O FHR2 green rhythm LED signal
4 LED_H2R O FHR2 red rhythm LED signal
5 LED_REC/ZOOM O Record(D) or zoom(S) LED signal
6 LED_ALM/REC O Alarm(D) or record(S) LED signal
7 LED_INFO O Information LED signal
8 LED_ALM O Alarm LED signal
9 SEG_V1 O Volume 1 step display signal
10 SEG_V2 O Volume 2 step display signal
11 SEG_V3 O Volume 3 step display signal
12 SEG_V4 O Volume 4 step display signal
13 SEG_V5 O Volume 5 step display signal
14 SEG_V6 O Volume 6 step display signal
15 SEG_V7 O Volume 7 step display signal
16 VOL_UP1/ALM I DOP1 volume up(D) or alarm(S) key
17 VOL_DN1/VOL_UP I DOP1 volume down(D) or volume 
up(S) key
18 VOL_UP2 I DOP2 volume up key
19 VOL_DN2/VOL_D
N
I DOP2 volume down(D) or volume 
down(S) key
20 REC/ZOOM I Record(D) or zoom(S) key
21 UC_REF I UC reference key
22 ALM/REC I Alarm(D) or record(S) key
23 SEG0 O 7-segment 0 enable signal
24 SEG1 O 7-segment 1 enable signal
25 SEG2 O 7-segment 2 enable signal
22
BT-300 Service Manual V2.0
26 SEG3 O 7-segment 3 enable signal
27 SEG4 O 7-segment 4 enable signal
28 SEG5 O 7-segment 5 enable signal
29 SEG6 O 7-segment 6 enable signal
30 SEG7 O 7-segment 7 enable signal
31 SEGA O 7-segment A display signal
32 SEGB O 7-segment B display signal
33 SEGC O 7-segment C display signal
34 SEGD O 7-segment D display signal
35 SEGE O 7-segment E display signal
36 SEGF O 7-segment F display signal
37 SEGG O 7-segment G display signal
38 GND - Ground
39 GND - Ground
40 GND - Ground
* D : dual, S : single
L. TPH Connector
S T R O B E 0
/ T P H _ L E
S T R O B E 1
D V P 5
T P H _ C K
P V P 2 4
T P H _ D I
J 9
1 5 P
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
1 5
Pin Name I/O Description
1 PVP24 O +24V power
2 PVP24 O +24V power
3 GND - Ground
4 GND - Ground
5 DVP5 O +5V power
6 NC - -
7 STROBE
0
O TPH strobe 0 signal
8 STROBE
1
O TPH strobe 1 signal
23
BT-300 Service Manual V2.0
9 TPH_CK O TPH clock signal
10 /TPH_LE O TPH LE signal (active low)
11 TPH_DI O TPH data signal
12 GND - Ground
13 GND - Ground
14 PVP24 O +24V power
15 PVP24 O +24V power
M. Motor Connector
M C K 0
M C K 2
C 1 3 8
J 1 2
6 P
1
2
3
4
5
6P V P 2 4
M C K 1
I V P 1 6
U 2 8
T D 6 2 0 6 4 A F
3
6
1 1
1 4
2
7
9
1 6
8
1
1
8
1
7
B 1
B 2
B 3
B 4
C 1
C 2
C 3
C 4
K 2 & 3
K 1 & 4
G
2
G
1
C 1 4 1
M C K 3
Pin Name I/O Description
1 MCK0 O Motor clock 0 signal
2 MCK1 O Motor clock 1 signal
3 MCK2 O Motor clock 2 signal
4 MCK3 O Motor clock 3 signal
5 PVP24 O +24V power
6 PVP24 O +24V power
N. Printer Door Check Connector
J 1 4
5 2 6 7 - 2
1
2
s i g n a l
Pin Name I/O Description
1 SIGNAL I Door open check signal
2 GND - Ground
O. Printer Paper Check Connector
24
BT-300 Service Manual V2.0
R 1 6 1
U 2 2 F
7 4 H C 0 4
1 31 2
14
7U 2 2 E
7 4 H C 0 4
1 11 0
14
7
P A P E R
D V P 5
J 1 7
5 2 6 7 - 3
1
2
3
R 1 6 0
R 1 5 9
Pin Name I/O Description
1 LL O Level signal
2 DVP5 O +5V power
3 PAP I Paper check signal
2.2.3 Key Board
 Circuit Diagram
25
BT-300 Service Manual V2.0
S E G _ D
S E G _ G
S E G _ D
L E D _ I N F O
U C _ R E F
S E G _ E
S E G _ C
V O L _ U P 2
D 1
1
2
3
4
5
6
7
8 9
1 0
1 1
1 2
1 3
1 4
1 5
1 6
D P
G
F
E
D
C
B
A 9
1 0
1 1
1 2
1 3
1 4
1 5
1 6
S E G _ B
S E G _ E
U 3
1
2
3
4
5
6
7
8
9 1 0
1 1
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 E
1 D
1 C
1 D P
2 E
2 D
2 G
2 C
2 D P 2 B
2 A
2 F
2 C O M
1 C O M
1 B
1 A
1 G
1 F
S E G _ F
S E G _ V 5
S W 3
1 2
J 1
H E A D E R 2 0 X 2
2
4
6
8
1 0
1 2
1 4
1 6
1 8
2 0
2 2
2 4
2 6
2 8
3 0
3 2
3 4
3 6
3 8
4 0
1
3
5
7
9
1 1
1 3
1 5
1 7
1 9
2 1
2 3
2 5
2 7
2 9
3 1
3 3
3 5
3 7
3 9
S E G _ AS E G _ C
S E G E 7
L E D _ A L M / R E C
L E D _ I N F O
S E G E 2
S E G _ A
S E G _ D
V O L _ D N 1 / V O L _ U P
R E C / Z O O M
S E G E 4
S E G E 3
L E D _ H 1 R
U C _ R E F
A L M / R E C
L E D _ A L M
S W 6
1 2
S E G _ B
S E G _ D
D 4
P C B - 1 0 0- K E Y - P 0 2 . D S N C
B T 3 0 0 D / S K E Y C I R C U I T d e s i g n e d b y B i s t o s R & D D e p t .
A
1 1, 9 1 6 , 2 0 0 3화 요 일 월
T i t l e
S i z e D o c u m e n t N u m b e r R e v
D a t e : S h e e t o f
S E G _ A
L E D _ A L M / R E C
S E G _ E
S E G _ D
S E G _ V 4
S E G _ C
S E G _ B
S E G _ F
L E D _ H 2 R
V O L _ U P 2
S E G _ V 2
S E G E 1
S E G _ V 3
A L M / R E C
S E G _ V 2
D 2
S W 4
1 2
S E G _ E
S E G _ V 3
S E G E 4
L E D _ H 2 G
L E D _ R E C / Z O O M
S E G _ V 7
S E G _ C
L E D _ H 1 G
V O L _ U P 1 / A L M
D 7
S E G _ G
L E D _ H 1 R
S E G _ F
S E G E 6
D 5
S E G E 2
S E G _ V 5
S E G _ G
S E G E 3
S E G _ V 7
S W 1
1 2
S E G E 5
S E G _ V 1
S E G E 6
S E G _ V 6
S W 5
1 2
L E D _ R E C / Z O O M
S E G _ B
L E D _ H 2 G
S E G E 7
L E D _ A L M
D 6
U 2
8
7
9
1 0
1 1
1 2 1
2
3
4
5
D 3
B
D 2
F
A
D 1 E
D
D P
C
GS E G E 1
S E G _ C
L E D _ H 2 R
S E G E 5
V O L _ D N 2 / V O L _ D N
U 1
8
7
9
1 0
1 1
1 2 1
2
3
4
5
D 3
B
D 2
F
A
D 1 E
D
D P
C
G
S E G _ A
R E C / Z O O M
S E G _ F
S E G _ V 6
S E G _ V 1
S E G _ A
S W 2
1 2
S E G E 0
S E G _ V 4
V O L _ D N 1 / V O L _ U P
S E G E 0
S E G _ G
S E G _ F
S W 7
1 2
S E G _ B
S E G _ G
V O L _ U P 1 / A L M V O L _ D N 2 / V O L _ D N
S E G _ E
D 3
L E D _ H 1 G
 Technical Description
FHR and UA are displayed on the 7-segment U1, U2, U3 and signal 
quality is displayed on the two colors LED D2, D4.
D3, D5, D6, D7 LED display the state of alarm, recording, zoom 
and information operation respectively. SW1 ~ SW7 are key 
switches.
D1 is displayed the volume step.
 Connection
This connection is same as the key board connection in main 
board.
2.3 Doppler Probe
26
BT-300 Service Manual V2.0
2.3.1 Composition
① Ultrasound Sensor
② Doppler Case
③ Probe Cable
2.4 UC Probe
2.4.1 Composition
27
①
②
③
①
①
BT-300 Service Manual V2.0
① UC Board
② UC Case
③ Probe Cable
2.4.2 Technical Description
 Circuit Diagram
28
②
③
BT-300 Service Manual V2.0
P C B - 1 0 0 - U C - P 0 2 . D S N C
B T 3 0 0 D / S U C P R O B E C I R C U I T b y B i s t o s R & D D e p t .
A
1 1, 9 1 6 , 2 0 0 3화 요 일 월
T i t l e
S i z e D o c u m e n t N u m b e r R e v
D a t e : S h e e t o f
U
CV
B1
A V P 1
V 1 5
1
R 8
A V P 1 2
G N D 1
V 1 2
1
R 5
R 6
G 3
1
+
-
U 1 C
T L 0 6 4
1 0
9
8
4
1
1
V 1 6
1
U C _ R E F
U C _ R E F
V 1 4
1
R 3
U 2
7 8 L 0 5
1 3
2
O U T I N
G
N
D
U C _ R E F
UC
M
1
G 2
1
U C _ R E F
V 6
1
V R 1
1
3
2
V 1
1
R 4
V 3
1
C 2
V 2
1
R 7
V 8
1
R 1 2
A V P 1 2
G 4
1
V R 2
1 3
2
A V P 1 2
U C _ O U T 1
V 7
1
C 1
UC
P1
+
-
U 1 B
T L 0 6 4
5
6
7
4
11
V 1 3
1
A V P 1 2
V 5
1
R 1 1
J P 1
1 2 3
G 1
1
V 1 7
1
V 9
1
V 1 0
1
V 4
1
V 1 1
1
R 9
S G N D 1
R 1 0
+
-
U 1 A
T L 0 6 4
3
2
1
4
1
1
C 3
J P 2
1
2
3
4
R 1
 Technical Description
The uterine contraction is converted to electrical signal by using 
pressure sensor “strain gauge“. This signal is compensated the 
difference of production by adjusting the offset and gain. And it is 
transmitted to main board.
 Connection
Pin Name I/O Description
1 UC_OUT
1
O UC output
2 GND1 - Ground
3 AVP12 I +12V power
4 SGND1 - Shield ground
29
BT-300 Service Manual V2.0
Section 3. Troubleshooting
3.1Warning Sign Occasion and Status Checking
1 After the monitor power on, Information sound rings once.
2 If the ultrasound transducer pulls out of the connector during 
monitoring(error #4), it rings once every 3 seconds until the 
transducer is connected to the connector or pressing the 
ALM(alarm) pushbutton causes the alarm function disable. 
3 When the REC(record) pushbutton is pressed for recording in case 
of print door open or under recording, when the door is opened, it 
rings once every 3 seconds and “ERR 1” - “REC ERR 1” in BT-300D 
-appears in the FHR and UC display as shown below until the door 
is closed or pressing the ALM(alarm) pushbutton causes the alarm 
function to be disabled and return to the normal monitoring mode.
[Figure 4.1 Front Panel for BT-300S]
[Figure 4.2 Front Panel for BT-300D]
4 When the REC(record) pushbutton is pressed for recording in case 
of paper empty or printer door open, or when the paper runs out 
under recording, it rings once every 3 seconds and “ERR 2” - “REC 
ERR 2” in BT-300D - appears in the FHR and the UC display until 
the paper is installed or pressing the ALM(alarm) pushbutton 
causes the alarm function to be disabled and go back to the 
normal monitoring mode.
30
BT-300 Service Manual V2.0
5 When the auto-printing period is expired, it rings once, right after 
stop recording.
Error Number Cause Solution
1 Printer door open Close the door
2 Paper empty Insert the paper
3 Printer door open & Paper 
empty
Close the door & Insert the 
paper
4 Dop1 probe open under normal operation Connect the Dop1 probe
5 Dop2 probe open under normal operation Connect the Dop2 probe
[Table 4.1 Errors and Trouble shooting]
 Alarm Occasion and Status Checking Up
When the measured FHR is beyond the alarm setting range for more 
than 20 seconds during monitoring, it rings every 3 second until the 
FHR is within the alarm setting range at least once or pressing the 
ALM(alarm) pushbutton causes the alarm function to be disabled on 
purpose.
3.2Troubleshooting on the Other Situation
3.2.1 Power operation
 Not operate the power
31
BT-300 Service Manual V2.0
1 Check AC input  supply 110/220 V 
2 Check +16V Power Adaptor output  replace Power 
Adaptor
3 Check DC power in Main Board 
  +16V (IVP16) : L2 point
+24V (PVP24) : U29 - D10 point
+5V (DVP5) : U35 - 4pin
+3.3V (DVP3.3) : U31 - 2pin
+1.8V (DVP2.8) : U36 - 2pin
+12V (AVP12) : U9 - 3pin
+5V (AVP5) : U10 - 1pin
3.2.2 Doppler operation
 Not display the HR value
1 Check HR signal in Main Board  DOP1_HR signal : U4C-
8pin
2 Refer to display operation
 Not hear the Doppler sound
1 Check sound signal in Main Board 
 DOP1_S signal : U6C-8pin
2 Check volume operation  U5
3 Refer to sound operation
3.2.3 UC operation
 Not display the UC value
1 Check UC signal in Main Board  U7C - 8pin
2 Refer to display operation
3.2.4 Sound operation
 Not hear the Alarm / Information sound
1 Check the PWM  U43 - 36pin
2 Check the Audio Amp  U8
3.2.5 Key operation
 Not operate the key
1 Check Main Board / Key Board cable  re-connection (J13)
2 Check the key input signal in Main Board  U21 - input
3.2.6 Display operation
32
BT-300 Service Manual V2.0
 Not operate the display 
1 Check Main Board / Key Board cable  re-connection (J13)
2 Check the display output signal in Main Board
 U11, U13, U15, U19 - output
3.2.7 Print operation
 Not operate print
1 Check the cable Main Board / Print Engine 
  re-connection (J9, J12, J14, J17) 
2 Check the TPH control signal in Main Board 
 U43 - 5pin, 22pin, 24pin, U27 – 14pin, 15pin
3 Check the motor control signal in Main Board 
 U27 - 19in, 18pin, 17pin, 16pin
3.2.8 RS-232C operation
 Not operate serial communication
1 Check the serial in/out signal in Main Board  U26
Section 4. Maintenance and Cleaning
4.1Maintenance and Cleaning
You can keep BT-300 clean in many different ways. Use the 
following recommendations to avoid the damage or stain of the 
machine. 
If you use the material that is not approved, it may cause damage 
33
BT-300 Service Manual V2.0
to the product. In this case, the product will not be guaranteed even 
within warranty period.
Caution
Check the main unit and the probes thoroughly after cleaning.
Do not use the old and damaged equipment.
To keep the machine clean, apply alcohol on a soft cloth and scrub 
the body and the probe once a month. Do not use lacquer, thinner, 
ethylene, or the oxidizing substance.
Keep the probes from dust orstain. Wipe the cable with a soaked 
cloth that is wet with warm water (40℃ / 104℉), and with the clinical 
alcohol once a week.
Do not soak the machine or the probes into any liquid or detergent. 
Keep the machine or the probes away from any liquid.
4.2Regular Inspection
Perform the periodical safety inspection on BT-300 once a year. For 
the inspection details, see the service manual provided by BISTOS 
Co., Ltd.
.
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BT-300 Service Manual V2.0
Section 5. Specifications
 Ultrasound Mode
Technique: Pulsed Doppler Wave /
Autocorrelation Processing
Pulse Repetition Frequency: 3.5 KHz
Pulse Duration: 128㎲
Center Frequency: 1MHz
Intensity: <10mW/cm2
Heart Rate Counting Range: 50 ~ 240 BPM
FHR Accuracy: ±2% of range
Leakage Current: <10㎂
Dual Fetus
 Uterine Activity Mode
Range, Tocotransducer: 0 ~ 99 Relative Units
Excitation Voltage: +5.0Vdc
Resolution: 1 Relative Unit
Bandwidth, Tocotransducer: DC ~ 0.5Hz
 Power Requirements
Line Voltage: 100 ~ 250VAC
Line Frequency: 50 or 60Hz
Power Consumption: 80VA max
 Physical Characteristic
Height: 19.1cm (7.5 in)
Width: 18.7cm(7.4 in)
Depth: 20.1cm(7.9 in)
Weight: 6Kg(13.2 lbs)
 Environmental Characteristics
Operating Temperature: 10℃(50℉) to 40℃(104℉)
Operating Humidity: 30% ~ 85% non-condensing
Storage Temperature: -10℃(14℉) to 
60℃(131℉)
Storage Humidity: 20% ~ 95% non-condensing
Operating Atmospheric Pressure: 70 ㎪ ~ 106㎪
Storage Atmospheric Pressure: 70 ㎪ ~ 106㎪
35
BT-300 Service Manual V2.0
 Functional Features
FM UC
Dual Fetal Movement External Type
Reference (Zeroing) Control
Printer
Thermal Array Type
Print Speed: 10, 20, 30 mm/min
Paper Feeding Function
Print Contrast: 1, 2, 3 steps
Auto Print Period: 0(Off), 10, 20, 30, 40, 50, 60min
Display
7-Segment LED
2 Channels (HR, UC)-BT-300S/3 Channels (HR1, HR2, UC)-BT-300D
Indicators
Heart Rhythm (Green: Stable, Red: Unstable)
Alarm On/Off State
Print On/Off State
AC Power (Green LED)
Sound
Doppler Sound with Volume Control (8 steps)
Alarms Sound: exceed FHR Range
Information Sound: Doppler Probe Off, Paper Off, Door Open, Watch 
Dog
Set-up Function
Alarm Upper/Lower Limit Value Event Mark Function
Print Speed Zoom in Function
Print Contrast Doppler2 Offset Function
Auto Print Period
External Link
RS-232C: for Central Monitoring(Option)
36
BT-300 Service Manual V2.0
 
Service Telephone and Fax. Numbers
Telephone: 82-2-862–0642, 0643
Fax: 82-2-862–0644
BISTOS Co., Ltd
201, 2F, 239-15, Gasan-Dong
Geumcheon-Gu,
Seoul, Korea
Model Name: BT-300
www.bistos.co.kr
bistos@bistos.co.kr
EC Representative: Econet Medical Gmbh
High-t'Park Mainstr. 6c-6d D-45768 Marl/Germany
Telephone: +49 2365 92 437 - 0
Fax: +49 2365 92 437 – 55
37
http://www.bistos.co.kr/
	Caution
	Terms of Warranty
	How to contact us …
	Definition of Warning, Caution, Note
	General Precaution on Environment
	General Precaution on Electric Safety
	Section 1. General Information 
	1.1 Product Overview
	1.2 Product Features
	1.3 Product Configuration
	Section 2. Technical Description
	2.2 Main Unit
	1.2. Composition
	2.2. Main Board
	2.2.3 Key Board
	2.3 Doppler Probe
	2.3.1 Composition
	2.4 UC Probe
	2.4.1 Composition
	2.4.2 Technical Description
	Section 3. Troubleshooting
	3.1 Warning Sign Occasion and Status Checking
	Alarm Occasion and Status Checking Up
	3.2 Troubleshooting on the Other Situation
	Section 4. Maintenance and Cleaning
	4.1 Maintenance and Cleaning
	Caution
	4.2 Regular Inspection
	Section 5. Specifications