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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.
Caution
Federal law restricts this device to sale by
or on the order of a physician
3
BT-300 Service Manual V2.0
How to contact us …
4
BT-300 Service Manual V2.0
5
BT-300 Service Manual V2.0
You can contact us the following address and telephone numbers
for services and supplies.
Oversea Sales Team
BISTOS Co., Ltd.
Product and
Order Inquiries
201, 2F, 239-15, Gasan-Dong,
Geumcheon-Gu, Seoul, Korea
Tel : +82-2-862-0642
Fax: +82-2-862-0644
Customer Service Team
Service
Request
and
Technical
Support
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: [email protected]
Definition of Warning, Caution, Note
6
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.
7
BT-300 Service Manual V2.0
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 disassemble the equipment.
BISTOS Co., Ltd. takes no
responsibility of it
Power off when
the equipment
is
not fully
installed.
Otherwise, the
equipment
could be
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
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 and displays 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
10
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
1.2.
Main Unit
Composition
①
12
BT-300 Service Manual V2.0
②
③
① Key Board
② Print Engine
③ Main Board
2.2.

Main Board
Circuit Diagram
< Analog Part >
13
BT-300 Service Manual V2.0
D1
D O P 1_I
R1
D O P 1_Q
AVP12
R2
AV P12
C2
R3
R5
Q1
C3
R4
11
C 28
D2
11
R 15
5
C 14
R 11
11
C 13
7
13
12
C 15
4
C 10
U 3D
TL064
TL064
C 19
U 1C
2
14
R 19
11
10
C27
TL 06 4
1
4
4
AVP5
C 22
3
C 17
R 22
AVP5
R 23
TL064
9
U 3A
11
11
4
R 12
R18
U 1B
6
R21
C 170
R 31
C6
R 14
4
C 18
D G 212
C 26
R28
3
AV P12
AVP5
R 29
R 27
D3
TL 064
1
AVP5
AVP12
8
C 23
C 25
AVP5
R 165
4
R 26
R 25
R 24
C9
R 10
U 1A
2
C12
AVP5
C21
Q5
C 24
AVP5
13
V+ 4
V- 12
VC C 5
GND
S1
S2
S3
S4
R8
+
C 20
R 30
AVP 12
-
C 16
Q4
D O P 1 _ ID
3
14
11
6
R7
14
+
R 17
1
16
9
8
+
L M B 0 5 0 9 -6 P
R 16
R 20
IN 1
IN 2
IN 3
IN 4
+
C11
D1
D2
D3
D4
-
2
15
10
7
R13
L2
12
C5
AVP 12
TL064
13
C 169
U2
+
AVP 12
C7
L1
R6
-
N1
N2
N3
U 1D
Q3
+
J1
R9
AVP5
-
C4
AVP 12
1
2
3
5
6
8
C8
D O P 1_ P
Q2
-
+
-
C1
R 32
AVP5
D4
R36
R 42
5
D7
4
TL064
9
10
AVP5
8
4
C36
C 35
R 51
11
TL 064
R57
C 40
TL064
6
R 59
+
4
C 41
R58
5
C 42
R 62
4
R 55
AVP5
R 67
R 64
C 45
1
2
3
5
6
8
D O P 2_P
VO L2_0
VO L2_1
J4
2
4
6
8
C46
R 68
3
U 6C
9
10
A
B
C
6
TL064
8
C 43
D 1_R EF
IN H
16
7
C 44
O /I
VDD
VEE
D O P1_S
C D 40 51B
AVP5
2
4
6
8
1
3
5
7
R 53
I /O 0
I /O 1
I /O 2
I /O 3
I /O 4
I /O 5
I /O 6
I /O 7
11
10
9
V O L1_ 0
V O L1_ 1
V O L1_ 2
AVP12
R 66
AVP 12
J3
A N AL_C O N
R 70
R 69
R71
IV P 1 6
D O P1_S
R 73
U 7A
TL064
R75
R 76
1
C48
+
C 47
U 7D
11
11
-
3
13
12
TL06 4
U8
C 50
14
J6
1
C 51
4
2
C52
+
1
2
2
4
6
8
4
2
+
R 74
D O P2_S
D O P 2_S
D O P 2_H R
AVP5
C 49
-
VO L2_2
D O P 2_Q
D O P 2_I
D O P 2 _ ID
R 72
+
TR AN S D U C ER
1
3
5
7
L M B 0 5 0 9 -6 P
5
N1
N2
N3
R 60
7
D 1_R EF
R 63
S TIM U LA TO R
J2
R 56
U6B
R 61
1
D9
4
C 39
13
14
15
12
1
5
2
4
11
11
3
+
2
14
-
12
C 38
+
TL064
13
R 65
U 6A
-
D8
U5
R 52
R 54
U 6D
11
R 50
4
4
R 49
+
+
4
AVP5
AVP12
R 48
AVP5
D O P1_H R
C 34
AVP5
C 37
R 44
7
-
-
AVP5
U 4C
TL06 4
6
R 47
R 46
U 4B
R 43
4
8
TL0 64
1
4
3
11
2
14
11
11
11
11
11
12
AVP5
+
10
TL064
-
9
+
5
R 45
TL064
13
U 3C
TL0 64
7
-
6
C 30
+
C 33
R 38
R39
U 4A
-
R 40
U3B
C 32
R 37
D6
U 4D
+
R 35
-
R 34
+
C 29
D5
R 41
-
R 33
C 31
AVP5
1
3
5
7
C 54
R 77
AV P12
TD A 2030
R 78
5 2 6 7 -2
R80
U 7C
AVP12
11
AVP 12
TL 06 4
9
-
10
C55
R82
C 61
UC
+ C 58
R 81
C 56
+ C 57
PW M
R83
4
L M B 0 5 0 9 -6 P
8
+
N1
N2
N3
C 53
R 79
3
A N A L_ S IG
1
2
3
5
6
8
4
AVP5
J5
J7
C 62
R 84
C 63
U C _ ID
U 9 LM 7812
1
OUT
IN
C 65
3
AV P12
AVP12
C 59
GND
+
78L05
3
+
C 60
VO
VI
1
IV P 1 6
G7 G6 G1 G2 G3 G4 G5
1
1
1
1
1
1
1
H T J - 0 3 5 -1 0
MAR K
C 64
2
1
2
GND
AVP5
J8
2
U 10
(MARK JACK)
T it le
S iz e
C
D ate:
< Digital Part >
14
B T 3 0 0 D / S A N A L O G C I R C U I T b y R & D d e p t . b is t o s . c o . lt d .
D ocum ent N um ber
P C B -1 0 0 -M A I N - P 0 3
월 요 일 , 10월 20, 2003
Rev
C
S hee t
1
of
2
BT-300 Service Manual V2.0
DVP5
C 66
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
7 4H C 0 4
TPH _C K
8
TPH _D I
7 14
4
5
6
9
/S E G V _ W R
2
3
4
5
6
7
8
9
11
IN I _ E N
1
74H C 04
D1
D2
D3
D4
D5
D6
D7
D8
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
C LK VC C
OE
GND
19
18
17
16
15
14
13
12
SEG_V1
SEG_V2
SEG_V3
SEG_V4
SEG_V5
SEG_V6
SEG_V7
DU AL
R85
R86
R87
R88
R89
R90
R91
20
V 3 V1 3 V2 3 V3 3 V4 3 V5 3 V6 3 V7 3 V8 3 V9 4 V0 4 V1 4 V2 4 V3 4 V4 4 V5 4 V6 4 V7 4 V8 4 V9 5 V0 5 V1 5 V2 5 V3 5 V4 5 V5 5 V6 5 V7 5 V8 5 V9 6 0
1
1
11
1
11
1
1
11
1
11
1
11
1
1
11
1
11
1
11
1
1
1
U 22B
3
7 14
2
V 6 V1 6 V2 6 V3 6 V4 6 V5 6 V6 6 V7 6 V8 6 V9 7 V0 7 V1 7 V2 7 V3 7 V4 7 V5 7 V6 7 V7 7 V8 7 V9 8 V0 8 V1 8 V2 8 V3 8 V4 8 V5 8 V6 8 V7 8 V8 8 V9 9 0
DVP5
10
1
1
11
1
11
1
1
11
1
11
1
11
1
1
11
1
11
1
11
1
1
1
74H C 04
14
14
U 11
U 2 2A
1
C 6 7 C 6 8 C 6 9 C 7 0 C 7 1 C 72 C 73
V 9 V1 9 V2 9 V3 9 V4 9 V5 9 V6 9 V7 9 V8 9 V9 1 V0 10 V0 1 V0 21 V0 13 V0 41 V0 51 V0 61 V0 71 V0 81 V0 91 V1 10 V1 1 V1 21 V1 31 V1 41 V1 51 V1 16 V1 71 V1 18 V1 91 2 0
C 74
U 22D
74H C 574
U 13
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
D VP5
U 43
R TC _/C S
R TC _AS
R TC _D S
R 96
D V P 1 .8
D V P 3 .3
128
111
1 06
76
70
57
45 00
34
31 4
Vss
Vss
VV ss ss
Vss
Vss
VV ss ss
Vss
VV ss ss
M M 1 07 5
C 100
J 11
D VP5
1
2
3
4
5
6
7
VPP
4
5
6
7
8
9
10
11
12
1
18
U 1 8 ,24 P
D VP5
PD7
PD6
/K E Y D _ R D
/I D D _ R D
2
D U A L / S IN G L E
/S E G E _W R
11
IN I _ E N
DVP5
C 1 11
U 12B
R S_D SP
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
R 10 4
R T C _ /C S
R TC _AS
R T C _ R /W
R TC _D S
/LE D D _ W R
74H C 04
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
U 1 2D
1
D VP5
7
5
14
3
DVP5
4
VC C
4
C1+
VDD
C1-
V+
NC
1
P1
9
D V P 3.3
3
OUT GND
2
N1
N2
1 5 .7 6 M H z O S C (5 V )
C 133
C2+
V-
D -S U B 9 P
1
6
2
7
3
8
4
9
5
5
R 148
R 149
C2-
GND
14
1 3 T1 O U T
7 R 1 IN
8 T2 O U T
R 2 IN
C 145
TX
RX
/V O LD _W R
11
1
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
2
4K
1
U 4 0D
1M
2
13
11
DVP5
74H C 04
12
74 H C 08
/P R N C _W R
U 3 9 ,1 4 P
U 39 B
74H C 08
4
2K
3
C 163
5
6 Q
Q
6
8
10
8
9
2K
1M
11
12
D
U 41A
3
AN A_R S
74 H C 0 8
C LK
C 159
D 11
1
C 157
U 37B
D O P2_I
6
U 3 4,1 4 P
1
C 161
1
74H C 08
13
10
8
G ATE2
11
12
9
V 1 V2 1 V2 12 V2 31 V2 14 V2 15 V2 16 V2 71 V2 81 V2 19 V3 01 3 1
C 118
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
C LK VC C
OE
GND
19
18
17
16
15
14
13
12
R 127
C 124
SEGE6
C 126
Q12
V O L 1 _0
V O L 1 _1
V O L 1 _2
V O L 2 _0
V O L 2 _1
V O L 2 _2
G ATE1
G ATE2
20
C 128
R 130
C 130
19
18
17
16
15
14
13
12
MO TO R _C K0
MO TO R _C K1
MO TO R _C K2
MO TO R _C K3
STR O BE0
STR O BE1
R 132
R 1 33
R 13 4
R 135
R 136
R 137
4.7K
4 .7K
4 .7 K
4 .7 K
R 138
SEGE7
Q13
C 129
DVP5
10
R 131
DVP5
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
C LK VC C
OE
C 131
104
J12
D1
D2
D3
D4
D5
D6
D7
D8
GND
U 28
3
6 B1
11 B2
14 B3
B4
DVP5
R 143
MCK0
MCK1
MCK2
MCK3
2
C1 7
C2 9
C 3 16
C4
PVP24
1
K1&4 8
K2&3
R 144
1
2
3
4
5
6
20
PVP24
IV P 16
J9
C 138 6P
DVP5
T D 6 20 6 4 A F
2
3
4
5
6
7
8
9
A0
A1
A2
A3
A4
A5
A6
A7
C 142
DVP5
J14
B0
B1
B2
B3
B4
B5
B6
B7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
C 141
10
18
17
16
15
14
13
12
11
1
20
1 9 D IR V C C 1 0
OE GND
PAPER
D OOR
1
2
D O P 1 _ ID
D O P 2 _ ID
U C _ID
5 2 6 7-2
STR OBE0
STR OBE1
T P H _C K
/T P H _ L E
T P H _D I
R 153
DVP5
S TIM U L A T O R
R 154
R 155
R 156
R 15 7
15P
R 1 58
C 148
DVP5
J13
U 22E
J17
U 22 F
10
11
DVP5
12
13
1
2
3
74 H C 04
A
13
R 161
R 1 6 0 5 2 6 7 -3
74 H C 0 4
C 155
C LR
12
R 1 59
A
1
LED _H 1G
LED _H 2G
L E D _ R E C /Z O O M
LE D _IN F O
SEG_V1
SEG_V3
SEG_V5
SEG_V7
V O L _ D N 1 /V O L _ U P
V O L _ D N 2 /V O L _ D N
U C _R E F
SEGE0
SEGE2
SEGE4
SEGE6
SEG_A
SEG_C
SEG_E
SEG_G
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
LED _H 1R
LED _H 2R
L E D _ A L M /R E C
LED _ALM
SEG _V2
SEG _V4
SEG _V6
V O L _ U P 1 /A L M
VO L_U P2
R E C /Z O O M
A L M /R E C
SEGE1
SEGE3
SEGE5
SEGE7
SEG _B
SEG _D
SEG _F
C LR
C 162
2
H E A D E R 20X2
4K
U 34B
9
8 Q
Q
D
C LK
74H C 08
DVP5
DVP5 DUAL
16K
8K
7 4H C 7 4
74 H C 08
U 38A
74H C 393
3
4 QA
5 QB
6 QC
QD
3
U 3 7D
U 37C
D O P2_Q
2
1
C LR 4
PRE
4
L M 1 1 1 7 M P X- 1 .8
C 123
C 125
D1
D2
D3
D4
D5
D6
D7
D8
2
DVP5
D
C LK
DVP5
5
SEGE5
Q11
C 120
PAPER
C LR
7
U 34A
5
6 Q
Q
74H C 08
R 126
MARK
C 11 7
C 11 9
7
+
V IN
VOUT
5
2
G N D /A D J
C 160
DVP5
1
U 3 7 ,1 4 P
SW
2
3
C 115
1 5 .97 4 4 M
/A N A _R S
2
D O P2_P
GND
L5
+
C 15 6
U 37A
FB
3
4
10
1
3
C 116
DVP5
U 33B
74H C 393
11
10 Q A
9 QB
8 QC
QD
U 39E
74H C 04
74H C 74
12
11
13
C LR 10
PRE
2K
1M
U 38B
74H C 393
11
10 Q A
9 QB
8 QC
QD
A
C LR
13
12
AN A_R S
DVP5 DUAL
7
1
11
1
11
1
11
1
1
C 1 58
IN
U35
L M 2 5 7 6 S -5 . 0
DVP5
U 36
2
4 OUT
4
1
1M
74H C 08
D V P 1.8
A
2
9
Q 8
Q
13
10 C LR
PRE
DVP5
74 H C 08
SEGE4
Q10
DVP5
C 14 9
U 33A
74H C 393
3
4 QA
5 QB
6 QC
QD
7
12
G ATE1
11
R X_Q
9
1
U 42B
9
8
16K
7 4H C 0 8
14
D O P1_Q
V O L _ U P 1 /A L M
V O L _ D N 1 /V O L _ U P
VOL_U P2
V O L _ D N 2 /V O L _ D N
R E C /Z O O M
U C _R EF
A L M /R E C
R 114
R 116
R 117
R 118
R 120
R 121
R 122
R 125
14
12
74H C 04
13
J 16
5 2 6 7-2
18
17
16
15
14
13
12
11
VCC
C 1 52
C 151
L M 1 1 1 7 M P X- 3 .3
B0
B1
B2
B3
B4
B5
B6
B7
VCC
13
74 H C 0 8
R X_I
10
23
+
C 15 0
2
1
+
G N D /A D J
C 1 53
10 4
A0
A1
A2
A3
A4
A5
A6
A7
8K
GND
U 41D
11
DVP5
U 4 2 ,1 4 P
U 3 2D
/I D D _ R D
14
7 4 H C 08
C 1 54
U 32C
C 113
R 115
74H C 245
U 41C
5
74H C 08
C 165
GND
J15
H T J - 0 2 0 -0 4
SEGE3
Q9
14
1
R 113
C 1 0 5 C 1 0 6 C 1 0 7 C 1 0 8 C 1 0 9 C 11 0 C 16 7 C 1 68
VCC
L4
3
DVP5
U 4 1 ,1 4 P
GND
GND
D VP5
U 3 2 ,14 P
3
IN
4K
U 39 D
C 166
2
4 OUT
4
16 K
4
74H C 08
74H C 74
74H C 08
4
5
6
/A N A _ R S
9
U 32B
D V P 3.3
3
3
6
SEGE2
C 104
C 112
VCC
8
U 41 B
1
C LR 4
PRE
10
2
D O P1_I
C LK
2
GND
R X_Q
D
11
2
1
SW
V IN
74H C 04
U 4 0C
+ C 147
R 108
Q8
DVP5
10
U 30
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
D VP5
U 42A
5
C 164
1
20
C 102
74H C 574
1M
7 4 H C 08
U 39C
U 32A
1
5
6
U 29
PQ 2C F1
2
3
4
5
6
7
8
9
11
IN I _ E N
DVP5
U 4 0 ,1 4 P
D O P1_P
GND
U 27
U 40 A
4
OE
LED _H 1G
LED _H 1R
LED _H 2G
LED _H 2R
L E D _ R E C /Z O O M
L E D _ A L M /R E C
L E D _ IN F O
L E D _ A LM
R 103
R 105
R 106
R 107
R 109
R 110
R 168
R 169
74H C 574
1
IV P 1 6
2
3
4
5
6
7
8
9
(FEMALE)
R 151
C LK VC C
19
18
17
16
15
14
13
12
U 24
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
15
11
T1IN 1 2
R 1OU T 10
T2IN 9
R 2OU T
1
U 31
2
3
4
5
6
7
8
9
M A X 2 3 2 C S E ( S MD )
C 146
L3
R 152
SEGE1
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
74H C 245
C 12 7
U 39 A
Vc
R 102
C 1 71
6
3
FB
SEGE0
C97
C 101
C 121
74H C 04
5
R 100
10
Q7
D1
D2
D3
D4
D5
D6
D7
D8
IN I _ E N
8
C 14 0
4
C 144
1
C 137
2
C 13 9
AD C _C K
AD C _R
AD C _X
AD C _C S
R 150
GND
Q6
DVP5
1
20
1 9 D IR V C C 1 0
OE GND
/K E Y D _R D
74H C 04
16
C 13 6
C 122 104
R X_I
2
OE
D VP5
20
74H C 574
R 124
U 26
U 12C
R 129
2
3
4
5
6
7
8
9
11
IN I _ E N
D V P 3.3
VCC DVP5
C 143 +
C LK VC C
19
18
17
16
15
14
13
12
U 19
D VP5
R 119
3
U 4 0B
D10
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
DVP5
AD0
19
A D 1 IR Q 23
AD 2 SQ W 24
AD 3 24
AD4
AD5
13
AD 6 C S 14
AD 7 AS 15
G N D R /W 17
MOT DS
RST
D S 1 2C 88 7
M C P 3 2 0 4 -B I/ S L
P V P 24
1
D1
D2
D3
D4
D5
D6
D7
D8
U 21
+
R 14 5 R 1 46 R 1 4 7
1
P IC D / L
4
129
19 22 7
62
15 85
17
13
25
24
22 23
21
12 90
67
66
65
64
63
61
32
31
23 09
28
22 76
UC
14
13
12
11
10
9
8
CH0
VDD
CH1
VREF
CH2
AGND
CH3
C LK
NC
DOUT
NC
D IN
D G N D C S /S H D N
DVP5
J1 8
2
3
4
5
6
7
8
9
P D [ 0 .. 7 ]
C 1 34
U 25
1
2
3
4
5
6
7
R 142
U 15
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
G2
G1
R 112
74 H C 0 4
D V P 3 .3
D V P 3 .3
D O P2_H R
C 8 7 C 8 8 C 8 9 C 9 0 C 9 1 C 92 C 93
10
18
17
IF _ S D O
IF _ S D I
51
77
78
79
82
93
94
96
97
98
1 5 .9 7 4 4 M
R 14 0
DVP5
20
7
R 111
1
R 16 2
C 13 2
GND
14
U 12A
2
IF _ S C K
C 13 5
R 141
OE
SEG _A
SEG _B
SEG _C
SEG _D
SEG _E
SEG _F
SEG _G
R92
R93
R94
R95
R97
R98
R99
74H C 574
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
D V P 3.3
C 1 03
AD C_R
AD C_CK
AD C_CS
AD C_X
U 23
R 139
C LK VC C
19
18
17
16
15
14
13
12
C 94
R 164
U18
41
43
45
48
53
59
42
44
47
49
54
60
74H C 04
D O P1_H R
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
74H C 574
P IC 1 6 C 7 7 /T Q F P
R 123
D V P 3.3
1
C 98
S S T3 9 V F 51 2
R 128
/S E G V _ W R
11
D1
D2
D3
D4
D5
D6
D7
D8
7
H IN T / T O U T 1
C LK M D 1
C LK M D 2
C LK M D 3
TO U T0
Vss
C LK O U T
X1
C L K IN / X 2
RS
25
26
27
/S E G D _ W R
C 99
14
TM S 3 2 0 V C5 4 0 2
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
R 1 01
/S E G D _ W R
/S E G E _ W R
/L E D D _ W R
/K E Y D _ R D
/V O L D _ W R
/P R N C _ W R
/I D D _ R D
/T P H _ L E
7
32
16 VC C
GND
C 114
13 1
13 2
13 3
13 4
13 6
13 7
13 8
13 9
14 0
14 1
5
7
8
9
10
11
10 5
10 7
10 8
10 9
DVP5
P IC D /L R S T
DVP5
38
39
40
41
2
3
4
5
PW M
IF _S C K
IF _S D I
IF _S D O
TX
RX
2
3
4
5
6
7
8
9
14
D V P 3 .3
12
11
10
9
8
7
6
5
27
26
23
25
4
28
29
3
2
1
30
22
24
31
C 96
7
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
1
30
CE
OE
WE
C95
2
4
R T C _ R /W
R S _D S P
14
D0
D1
D2
D3
D4
D5
D6
D7
BC LKR 0
BFSR0
BD R0
B C LK X0
B F S X0
B D X0
BC LKR 1
BFSR1
BD R1
B C LK X1
B F S X1
B D X1
58
69
81
95
1 20
1 24
1 35
6
39
46
1
3
6
13
14
15
17
18
19
20
21
HD0
HD1
HD2
HD3
HD4
HD5
HD6
HD7
H C N TL0
H C N TL1
VPP
1
8
2 TC R ESET 7
3 RESET Vs 6
4 CK RCT 5
GND VCC
1 5 .9 7 4 4 M
7
U 20
D0
D1
D2
D3
D4
D5
D6
D7
D V D D : 3 .3 V
U 17
HDS2
HH DP SIE 1N A
H B IL
HH RR D/WY
HCS
HAS
IO S T R B
M STR B
R /W
IS
DS
PS
READY
IN T 3
INI N TT 21
IN T 0
INA MC I K
M P /M C
B IO
HI A OQ L D
H OLD A
MX FS C
D [ 0 .. 7 ]
C V D D : 1 .8 V
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D 10
D 11
D 12
D 13
D 14
D 15
J10
32
35
36
37
42
43
44
1
14
89
88
87
86
85
88 43
11 24 25
91
68
15 26
11 13 02
75
53 63
4
CC VV DD DD
CVD D
CVDD
CVDD
CVD D
DVDD
D VDD
DVDD
DVDD
DD VV DD DD
TM S
TCK
T R S TT D I
TDO
E M U 1 /O F FE M U 0
TMS320VC 5402
99
10 0
10 1
10 2
10 3
10 4
11 3
11 4
11 5
11 6
11 7
11 8
11 9
12 1
12 2
12 3
19
R C 0 / T 1 O S O /T 1 C L K
2 0 R A 0 /A N 0
R C 1 / T 1 O S I/ C C P 2
2 1 R A 1 /A N 1
R C 2/C C P 1
2 2 R A 2 /A N 2
R C 3 /S C K / S C L
2 3 R A 3 /A N 3 / R E F
R C 4 / S D I/ S D A
2 4 R A 4 /T 0 C L K
R A 5 /A N 4 / S S
R C 5/S D O
R C 6 /TX/C K
8
R
B
0
/I
N
T
R
C 7 /R X/ D T
9
10 R B1
R D 0 /P S P 0
11 R B2
R D 1 /P S P 1
14 R B3
R D 2 /P S P 2
15 R B4
R
B
5
R
D 3 /P S P 3
16
R D 4 /P S P 4
17 R B6
R B7
R D 5 /P S P 5
R D 6 /P S P 6
30
R D 7 /P S P 7
3 1 O S C 1 /C L K
O S C 2 /C L K O U T
R E 0 /R D / A N 5
18
M C L R /V P P
R E 1 /W R /A N 6
R E 2 /C S / A N 7
7
28 V D D
VDD
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
U 16
D0
D1
D2
D3
D4
D5
D6
D7
1
1
11
1
11
1
1
11
1
11
1
11
1
1
11
1
11
1
11
1
1
1
74H C 04
7
7
U 2 2C
C 7 5 C 7 6 C 7 7 C 7 8 C 7 9 C 8 0 C 81 C 8 2 C 8 3 C 8 4 C 8 5 C 8 6
T it le
7 4H C 7 4
B T 3 0 0 D /S D I G IT A L C IR C U IT d e s i g n e d b y B IS T O S R & D D e p t.
S iz e
D
D a te :
D o c um e nt N u m b e r
P C B -1 0 0 -M A IN - P 0 3
수 요 일 , 1 0 월 22 , 2 0 0 3
R ev
C
S h e et
2
of
2
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 autocorrelation 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 >
3.47KHz
16
BT-300 Service Manual V2.0
Tx
Receive
Time
DOP1_P
DOP1_I,Q
DOP2_P
DOP2_I,Q
128
usec
32 usec
128
usec
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 thermal
paper. 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
BT-300 Service Manual V2.0
S T IM U L A T O R
AVP12
J1
N 1
N 2
N 3
AVP12
1
2
3
5
6
8
J2
S IG N A L
N 1
N 2
N 3
L M B 0 5 0 9 -6 P
1
2
3
5
6
8
S IG N A L
L M B 0 5 0 9 -6 P
D O P 1 _ ID
D O P 2 _ ID
Pin
1
I/O
I
Description
Acoustic stimulator enable signal
2
3
5
6
Name
Stimulat
or
GND
AVP12
GND
Signal
O
I/O
8
DOP_ID
I
Ground
+12V power
Ground
Transmitting and
signal
Identity signal
receiving
B. UC Probe Connector
J7
N 1
N 2
N 3
1
2
3
5
6
8
AVP12
S IG N A L
U C _ ID
L M B 0 5 0 9 -6 P
Pin
1
2
3
5
6
8
Name
I/O
NC
GND
Ground
AVP12
O
+12V power
Signal
I
UC out signal
NC
UC_ID
I
Identity signal
C. Mark Jack Connection
18
Description
ultrasound
BT-300 Service Manual V2.0
J6
S IG N A L
1
2
5 2 6 7 -2
Pin
1
2
Name
Signal
GND
I/O
I
-
Description
Mark enable signal
Ground
D. Doppler 2 control signal (only BT-300 dual)
D O P2_P
VO L2_0
VO L2_1
D O P2_S
D O P2_H R
AVP5
2
4
6
8
2
4
6
8
J3
J5
AN AL_C O N
A N A L _ S IG
1
3
5
7
1
3
5
7
1
3
5
7
S IG N A L
2
4
6
8
J4
TR AN S D U C ER
VO L2_2
D O P2_Q
D O P2_I
Name
Signal
DOP2_P
VOL2_0
VOL2_1
VOL2_2
DOP2_Q
DOP2_I
DOP2_S
DOP2_HR
AVP5
AVP12
AVP12
Description
Transmitting and receiving ultrasound signal
Digital pulse for transmitting
Volume control signal 0
Volume control signal 1
Volume control signal 2
180° control signal for demodulation
0° control signal for demodulation
Doppler sound signal
Doppler heart rate signal
+5V power
+12V power
E. Speaker Connector
19
BT-300 Service Manual V2.0
J6
S IG N A L
1
2
5 2 6 7 -2
Pin
1
2
Name
Signal
GND
F.
I/O
O
-
Description
Sound output
Ground
Input Power Connector
1
J15
IV P 1 6
2
1
23
H T J -0 2 0 -0 4
J16
5 2 6 7 -2
Pin
1
2
Name
IVP
IVP16
I/O
I
I
Description
+16V input power
+16V input power through power switch
G. CPU Reset Connector
J10
VPP
1
3
2
4
R ESET
P IC D /L R S T
Pin
1
2
3
4
Name
VPP
RESET
NC
RESET
I/O
I
O
O
Description
Power for program writing to CPU
CPU reset signal
CPU reset signal
H. Dual / Single Recognized Connector
20
BT-300 Service Manual V2.0
S IG N A L
D VP5
J18
1
2
D U A L /S IN G L E
Pin
1
2
Name
DVP5
SIGNAL
I.
I/O
O
I
Description
+5V power
Recognized signal
CPU Program Download Connector
J11
1
2
3
4
5
6
7
VPP
D VP5
PD 7
PD 6
/K E Y D _ R D
/ID D _ R D
P IC D /L
This connector is used only to download the CPU program.
J.
Central Monitor Interface Connector (RS-232C)
P1
N 1
N 2
D -S U B 9 P
1
6
2
7
3
8
4
9
5
R X
TX
(FEMALE)
Pin
2
3
5
Name
RX
TX
GND
I/O
I
O
-
Description
Receiving signal for central monitor
Transmitting signal for central monitor
Ground
K. Key Board Connector
21
BT-300 Service Manual V2.0
J13
LED _H 1G
LED _H 2G
L E D _ R E C /Z O O M
L E D _ IN F O
SEG _V1
SEG _V3
SEG _V5
SEG _V7
V O L _ D N 1 /V O L _ U P
V O L _ D N 2 /V O L _ D N
U C _R EF
SEG E0
SEG E2
SEG E4
SEG E6
SEG _A
SEG _C
SEG _E
SEG _G
1
1
1
1
1
2
2
2
2
2
3
3
3
3
3
1
3
5
7
9
1
3
5
7
9
1
3
5
7
9
1
3
5
7
9
2
4
6
8
1
1
1
1
1
2
2
2
2
2
3
3
3
3
3
4
0
2
4
6
8
0
2
4
6
8
0
2
4
6
8
0
LED _H 1R
LED _H 2R
L E D _ A L M /R E C
LED _ALM
SEG _V2
SEG _V4
SEG _V6
V O L _ U P 1 /A L M
VO L_U P2
R E C /Z O O M
A L M /R E C
SEG E1
SEG E3
SEG E5
SEG E7
SEG _B
SEG _D
SEG _F
H E A D E R 20X2
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Name
LED_H1G
LED_H1R
LED_H2G
LED_H2R
LED_REC/ZOOM
LED_ALM/REC
LED_INFO
LED_ALM
SEG_V1
SEG_V2
SEG_V3
SEG_V4
SEG_V5
SEG_V6
SEG_V7
VOL_UP1/ALM
VOL_DN1/VOL_UP
I/O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
I
I
18
19
VOL_UP2
VOL_DN2/VOL_D
N
REC/ZOOM
UC_REF
ALM/REC
SEG0
SEG1
SEG2
I
I
20
21
22
23
24
25
I
I
I
O
O
O
Description
FHR1 green rhythm LED signal
FHR1 red rhythm LED signal
FHR2 green rhythm LED signal
FHR2 red rhythm LED signal
Record(D) or zoom(S) LED signal
Alarm(D) or record(S) LED signal
Information LED signal
Alarm LED signal
Volume 1 step display signal
Volume 2 step display signal
Volume 3 step display signal
Volume 4 step display signal
Volume 5 step display signal
Volume 6 step display signal
Volume 7 step display signal
DOP1 volume up(D) or alarm(S) key
DOP1 volume down(D) or volume
up(S) key
DOP2 volume up key
DOP2 volume down(D) or volume
down(S) key
Record(D) or zoom(S) key
UC reference key
Alarm(D) or record(S) key
7-segment 0 enable signal
7-segment 1 enable signal
7-segment 2 enable signal
22
BT-300 Service Manual V2.0
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
*D:
SEG3
SEG4
SEG5
SEG6
SEG7
SEGA
SEGB
SEGC
SEGD
SEGE
SEGF
SEGG
GND
GND
GND
dual, S : single
O
O
O
O
O
O
O
O
O
O
O
O
-
7-segment
7-segment
7-segment
7-segment
7-segment
7-segment
7-segment
7-segment
7-segment
7-segment
7-segment
7-segment
Ground
Ground
Ground
3 enable signal
4 enable signal
5 enable signal
6 enable signal
7 enable signal
A display signal
B display signal
C display signal
D display signal
E display signal
F display signal
G display signal
L. TPH Connector
PVP24
J9
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
D VP5
S TR O B E 0
S TR O B E 1
TP H _C K
/T P H _ L E
TP H _D I
15P
Pin
1
2
3
4
5
6
7
8
Name
PVP24
PVP24
GND
GND
DVP5
NC
STROBE
0
STROBE
1
I/O
O
O
O
O
O
Description
+24V power
+24V power
Ground
Ground
+5V power
TPH strobe 0 signal
TPH strobe 1 signal
23
BT-300 Service Manual V2.0
9
10
11
12
13
14
15
TPH_CK
/TPH_LE
TPH_DI
GND
GND
PVP24
PVP24
O
O
O
O
O
TPH clock signal
TPH LE signal (active low)
TPH data signal
Ground
Ground
+24V power
+24V power
M. Motor Connector
J12
B
B
B
B
1
2
3
4
C
C
C
C
1
2
3
4
K1&4
K2&3
G 2
G 1
3
6
11
14
U 28
2
7
9
16
M
M
M
M
C
C
C
C
K
K
K
K
1
8
PVP24
0
1
2
3
1
2
3
4
5
6
IV P 1 6
Pin
1
2
3
4
5
6
Name
MCK0
MCK1
MCK2
MCK3
PVP24
PVP24
18
17
C 138
TD 62064A F
C 141
I/O
O
O
O
O
O
O
Motor clock 0
Motor clock 1
Motor clock 2
Motor clock 3
+24V power
+24V power
6P
Description
signal
signal
signal
signal
N. Printer Door Check Connector
J14
s ig n a l
Pin
1
2
Name
SIGNAL
GND
1
2
I/O
I
-
5 2 6 7 -2
Description
Door open check signal
Ground
O. Printer Paper Check Connector
24
BT-300 Service Manual V2.0
J17
PAPER
7
12
R 161
D VP5
13
R 159
Pin
1
2
3
Name
LL
DVP5
PAP
I/O
O
O
I
Description
Level signal
+5V power
Paper check signal
2.2.3 Key Board
 Circuit Diagram
25
1
2
3
R 160
74H C 04
14
11
14
10
74H C 04
U 22F
7
U 22E
5 2 6 7 -3
BT-300 Service Manual V2.0
J1
LED _H 1G
LED _H 2G
L E D _ R E C /Z O O M
L E D _ IN F O
SEG _V 1
SEG _V 3
SEG _V 5
SEG _V 7
V O L _ D N 1 /V O L _ U P
V O L _ D N 2 /V O L _ D N
U C _R EF
SEG E0
SEG E2
SEG E4
SEG E6
SEG _A
SEG _C
SEG _E
SEG _G
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
LED _H 1R
LED _H 2R
L E D _ A L M /R E C
LED _ALM
S EG _V2
S EG _V4
S EG _V6
V O L _ U P 1 /A L M
V O L_U P2
R E C /Z O O M
A L M /R E C
S EG E1
S EG E3
S EG E5
S EG E7
S EG _B
S EG _D
S EG _F
U 1
S
S
S
S
S
S
G
G
G
G
G
G
_B
E2
E1
_F
_A
E0
7
8
9
10
11
12
U 2
B
D 3
D 2
F
A
D 1
S
S
S
S
S
S
SEG _G
SEG _C
5
4
3
2
1
G
C
D P
D
E
SEG _D
SEG _E
E
E
E
E
E
E
G
G
G
G
G
G
_B
E5
E4
_F
_A
E3
7
8
9
10
11
12
B
D 3
D 2
F
A
D 1
U 3
S EG _E
S EG _D
S EG _C
E
E
E
E
G
G
G
G
1
2
3
4
5
6
7
8
9
_E
_D
_G
_C
1
1
1
1
2
2
2
2
2
E
D
C
D
E
D
G
C
D
1F
1G
1A
P
1B
1C O M
2C O M
2F
2A
P
2B
18
17
16
15
14
13
12
11
10
S
S
S
S
S
S
S
S
S
E
E
E
E
E
E
E
E
E
G
G
G
G
G
G
G
G
G
_F
_G
_A
_B
E6
E7
_F
_A
_B
SEG _V7
1
SEG _V6
2
SEG _V5
3
SEG _V4
4
SEG _V3
5
SEG _V2
6
SEG _V1
7
8
SW 1
V O L _ U P 1 /A L M
1
SW 2
2
V O L _ D N 1 /V O L _ U P
G
C
D P
D
E
S EG _G
S EG _C
5
4
3
2
1
S EG _D
S EG _E
D 1
S
S
S
S
H E A D E R 20X2
E
E
E
E
E
E
1
D P
16
G
15
F
14
E
13
D
12
C
11
B
10
A
9
16
15
14
13
12
11
10
9
SW 3
VO L_U P2
2
1
SW 4
2
V O L _ D N 2 /V O L _ D N
1
2
SW 6
LED _H 1G
A L M /R E C
1
R E C /Z O O M
D 3
SW 5
LED _H 1R
2
D 5
D 2
D 7
L E D _ R E C /Z O O M
D 6
L E D _ A L M /R E C
LED _H 2G
1
LED _ALM
2
L E D _ IN F O
LED _H 2R
D 4
SW 7
U C _R EF
1
2
T it le
S iz e
A
D a te :
B T 3 0 0 D / S K E Y C I R C U I T d e s ig n e d b y B is t o s R & D D e p t .
D ocum ent N um ber
P C B -1 0 0 -K E Y -P 0 2 .D S N
화 요 일 , 9월 16, 2003
R ev
C
Sheet
1
of
1
 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
①
②
③
① Ultrasound Sensor
② Doppler Case
③ Probe Cable
2.4
UC Probe
2.4.1 Composition
①
27
BT-300 Service Manual V2.0
②
① UC Board
② UC Case
③ Probe Cable
2.4.2 Technical Description

Circuit Diagram
28
③
UCVB1
UCP1
UCM1
1
2
3
BT-300 Service Manual V2.0
JP1
R 1
3
VR 2
2
VR 1
1
2
U C _R EF
11
11
11
-
3
1
6
R 8
5
R 10
U 1A
4
TL064
7
9
10
U 1B
4
+
R 9
TL064
4
1
R 5
2
+
R 7
-
R 6
TL064
8
JP2
+
R 4
AV P12
-
R 3
3
U 1C
A VP12
R 11
AVP12
R 12
1
UC_OUT1
2
GND1
3
AVP1
4
SGND1
C 1
U C _R EF
U C _R EF
AVP12
U 2
1
U C _R EF
O U T
IN
3
V 1 V5 1 V6 1 V7 1 V 2 V 3 V 4 V 5 V 6 V 7 V 8 V 9 V 1 V0 1 V1 1 V2 1 V3 1 4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
G N D
G 1 G 2 G 3G 4
2
78L05
1
1
1
1
C 3
C 2
T i t le
B T 3 0 0 D / S U C P R O B E C I R C U I T b y B is t o s R & D D e p t .
S iz e
A
D ocum ent N um ber
P C B -1 0 0 -U C -P 0 2 . D S N
D a te :

화 요 일 , 9월 16, 2003
R ev
C
Sheet
1
of
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.

Pin
1
2
3
4
Connection
Name
UC_OUT
1
GND1
AVP12
SGND1
I/O
O
I
-
Description
UC output
Ground
+12V power
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
Printer door open & Paper Close the door & Insert the
empty
paper
3
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 : U4C8pin
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

1
2
Not hear the Alarm / Information sound
Check the PWM  U43 - 36pin
Check the Audio Amp  U8
3.2.5 Key operation
 Not operate the key
1
2
Check Main Board / Key Board cable  re-connection (J13)
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
2
Check Main Board / Key Board cable  re-connection (J13)
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)
Check the TPH control signal in Main Board
 U43 - 5pin, 22pin, 24pin, U27 – 14pin, 15pin
Check the motor control signal in Main Board
 U27 - 19in, 18pin, 17pin, 16pin
2
3
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 or stain. 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.
.
34
BT-300 Service Manual V2.0
Section 5. Specifications
 Ultrasound Mode
Technique:
Pulsed Doppler Wave /
Autocorrelation Processing
3.5 KHz
128㎲
1MHz
<10mW/cm2
50 ~ 240 BPM
±2% of range
Pulse Repetition Frequency:
Pulse Duration:
Center Frequency:
Intensity:
Heart Rate Counting Range:
FHR Accuracy:
Leakage Current:
Dual Fetus
<10㎂
Uterine Activity Mode

Range, Tocotransducer:
Excitation Voltage:
Resolution:
Bandwidth, Tocotransducer:
0 ~ 99 Relative Units
+5.0Vdc
1 Relative Unit
DC ~ 0.5Hz
Power Requirements

Line Voltage:
Line Frequency:
Power Consumption:
100 ~ 250VAC
50 or 60Hz
80VA max
Physical Characteristic

Height:
Width:
Depth:
Weight:
19.1cm (7.5 in)
18.7cm(7.4 in)
20.1cm(7.9 in)
6Kg(13.2 lbs)
Environmental Characteristics

Operating Temperature:
Operating Humidity:
Storage Temperature:
60℃(131℉)
Storage Humidity:
Operating Atmospheric Pressure:
Storage Atmospheric Pressure:
35
10℃(50℉) to 40℃(104℉)
30% ~ 85% non-condensing
-10℃(14℉)
to
20% ~ 95% non-condensing
70 ㎪ ~ 106㎪
70 ㎪ ~ 106㎪
BT-300 Service Manual V2.0

Functional Features
FM
Dual Fetal Movement
UC
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
Alarm Upper/Lower Limit Value
Print Speed
Print Contrast
Auto Print Period
Function
Event Mark Function
Zoom in Function
Doppler2 Offset Function
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
[email protected]
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
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